Optimal Technological Mode Research Articles

Possibility of processing phosphogypsum to obtain an alkalizing reagent

Relevance. The need to develop a technology for the disposal of solid and liquid industrial waste to obtain organic-inorganic fertilizer. The growth of industrial production is accompanied by an increase in waste. In modern society, considerable attention is paid to the problem of processing man-made waste to obtain demanded products. Phosphogypsum is the main by-product of the production of fertilizers and phosphoric acid, it is a multi-tonnage waste, its storage leads to the withdrawal of vast territories from circulation. Liquid waste from pig farms also needs to be processed into organic fertilizers. Aim. To study the process of heat treatment of phosphogypsum in the presence of a reducing agent to obtain an alkalizing reagent. This will make it possible to further organize processing liquid and solid agricultural and industrial waste and produce domestic organic fertilizers Methods. Heat treatment of phosphogypsum in the presence of a reducing agent, followed by the preparation of an aqueous suspension to obtain an agent that reduces the acidity of livestock effluents. The samples of heat-treated phosphogypsum obtained during the study were characterized by X-ray phase analysis, electron microscopy. Suspensions with different pH values were obtained on their basis. Results and conclusions. The authors have studied heat treatment of large-tonnage inorganic waste of the chemical industry – phosphogypsum. It was found that the suspension of phosphogypsum heat-treated in the presence of a reducing agent has increased values of the hydrogen index, which can be used to obtain an alkalizing reagent for treating agricultural waste. The authors revealed the optimal technological modes of obtaining a reagent having the maximum pH value of the suspension: the amount of the introduced reducing agent is 0.16 mol/mol CaSO4, the heat treatment temperature is 1000 °C.

Optimization of Hydrochemical Leaching Process of Kaolinite Fraction of Bauxite with Response Surface Methodology

A technology for the hydrochemical processing of the kaolinite fraction of bauxite has been developed, and it involves preliminary chemical activation in a sodium bicarbonate solution and alkaline leaching in a recycled high-modulus solution with the addition of an active form of calcium oxide. Chemical activation allows for the transformation of the difficult-to-explore kaolinite phase to form easily soluble phases of dawsonite, sodium hydroaluminosilicate and bemite. An active, finely dispersed form of calcium oxide was obtained as a result of CaO quenching in Na2SO4 solution at elevated temperature and pressure. Using a central composite design (CCD) via response surface methodology (RSM), the technological leaching mode was achieved. The influence on the leaching process was studied by adjusting the CaO/SiO2 ratio, temperature, alkaline solution concentration and duration. It was found that the determining factors are the concentration of the leaching solution and the temperature. At a stable CaO/SiO2 ratio, a combination of these two factors determines the duration of the process to achieve the predicted degree of recovery. The results of experiments carried out using the developed model of the leaching process confirmed the validity of the calculated indicators, with an error of 2.01%. In an optimal technological mode at a Na2O leaching solution concentration of 260 g/L, a temperature of 260 °C, a CaO/SiO2 ratio of 1.5 and a leaching time of 5 h, the extraction of Al2O3 into the solution was 89.7%, which is close to the value of 87.9% predicted by the model.

Study of the influence of temperature and duration of chlorinating roasting on the extraction of gold from E-waste

In this work, based on experimental studies, the effect of roasting temperature and duration on the chlorination of gold from E-waste under low-temperature conditions was studied. It has been established that in the low-temperature range of 150-300 °C, the gold content in the residue shows a sharp decrease, reaching its minimum of 8 ppm at 250 °C. A further increase in temperature does not affect the gold content in the cinder. It has been shown that during chlorinating roasting above a temperature of 250 °C, side reactions should be expected to occur with the formation of additional phases representing chlorides of copper, iron and other elements. The results of SEM and XRD analyzes of the solid phase obtained after chlorinating roasting at a temperature of 250 °C and a roasting duration of 20 minutes showed the presence of copper and iron chlorides in them. Optimal technological parameters and modes of the process of chlorinating roasting of E-waste with gaseous chlorine have been established: temperature – 250 °С; roasting duration – 20 minutes; chlorine consumption is 1.5 times more than the stoichiometrically required amount (SRA) for gold chlorination. Under optimal roasting conditions, a high, up to ~97.6%, recovery of gold in the form of gold chloride (AuCl3) was achieved. The results of the experiments can be a basic basis and make it possible to conduct more representative experiments (scaling) in the future, taking into account the established optimal technological parameters. This will provide a chance to evaluate the possibility of extracting gold from E-waste of different types and compositions and to conduct further research on obtaining pure gold from the collected representative amount of gold sublimate AuCl3 by smelting.

Regulation of Fat Content in Triticale Based on Optimization of Technological Processing Modes

Introduction The aim of the study was to regulate the fat content based on the optimization of technological processing modes. A promising method of preparing grain for animal feeding is its preliminary germination. Sprouted grain is a dietary food product, as it increases the content of proteins, essential amino acids, and macro- and microelements in comparison with non-sprouted grain. Methods The purpose of this study was to regulate the fat content based on the optimization of technological processing modes. Regression equations describing the dependences of the quality indicators of the triticale grain germination modes on the factors tw, τ, w and tg affecting them were investigated and obtained. During the study of triticale grains, it was found that the most significant parameter affecting the germination process is the fat content. The optimization of the germination modes of triticale Leather grain was carried out by the method of nonlinear programming. Results During the study, it was found that the maximum fat content during germination of triticale grain was observed with the following technological parameters of germination: grain temperature = 30°C; germination time = 24 h; grain moisture = 13%; and grain temperature = 26°C. When controlling the fat content in triticale based on the optimization of technological modes, the target function was 2.83%. Conclusion The presented results and conclusion will allow to regulate the fat content in triticale grain during germination.

REGULATION OF GAS WELL PRODUCTION IN OFFSHORE OIL AND GAS FIELDS

The main issue in the operation of gas wells is the regulation of the pressure in the well and the establishment of certain dimensions of the production flow. There is a "practical well productivity" in the field of gas production. Practical productivity measures are expressed as a percentage of full open well production, practical productivity should not exceed 25% of open well production. Practical productivity is effective and economically efficient debit. Limits of 20 or 25% apply to more or less large flow rates and early stages of operation. Then, due to the depletion of the reservoir, the pressure is very low, so it is allowed to take all the flow rate that the well can produce. At the last stage of the operation, the gas can be produced under vacuum. This optimum pressure also determines the "practical yield". Wellbore pressure can be expressed as a percentage of the pressure present in the formation during production at a distance from the well where the formation has not yet been depleted. To achieve practical productivity, it is necessary to produce gas with a certain back pressure. For each formation, it is important to have an "optimal working pressure" in the well during operation. For this reason, creating an optimal technological mode in wells during operation is one of the important issues. In the optimal technological mode, well production is maximum and resource consumption is minimum. In this mode, harmful events that disrupt the normal operation of the well do not occur. The so-called "90% method" is recommended for the operation of gas fields in the Republic of Azerbaijan. This method has been successfully applied in a number of gas fields in the United States. Keywords: gas production, productivity, field depletion, practical productivity, flow rate, optimal mode, average well.

Analysis of experience in optimizing the operation of an automated production line for folding cardboard boxes

The object of research is an automated system for controlling the bending mechanisms of the folding-gluing line for cardboard packaging products. In the work, the ways of optimization and the development of an automated control system for the bending mechanisms of the folding and gluing line, which makes it possible to fold various structures and standard sizes of cardboard boxes using modern automation tools based on programmable logic controllers, were carried out in the work. A mathematical model has been proposed to describe operations on the folding-gluing line. Based on the model, a methodology has been developed for calculating the parameters of the automated control system for the box folding production line, depending on the technical parameters of the line and the parameters of the boxes to be bent. This will make it possible to choose optimal technological modes of the production process and obtain high quality parameters of cardboard packaging products. To verify the mathematical model of the production line, software has been developed in the Delphi development environment, which was applied with the developed automated production process control system based on a programmable logic controller (PLC) and an operator panel. This produced a number of results, in particular, controlling the speed of the hook bend in proportion to the speed of the line. And also provided an opportunity to increase line speed and, accordingly, production productivity. It has been possible to change the mutual location of system elements, which made it possible to reduce the distance between workpieces and increase the capacity of the line tape by 30 %. The obtained research results were implemented at the production enterprise of typographic products «Dinas» (Zaporizhzhia, Ukraine), which contributed to the improvement and optimization of production processes. Conducting further research will provide an opportunity to expand the proposed methodology for use on all types of folding and gluing lines.

СОВРЕМЕННЫЕ ЗАДАЧИ НАУЧНЫХ ИССЛЕДОВАНИЙ В ОБЛАСТИ ВИНОДЕЛИЯ

The article presents the results of research activities for 2023 of the Federal State Budget Scientific Institution All-Russian National Research Institute of Viticulture and Winemaking Magarach of the RAS in the field of winemaking, carried out in accordance with the Program of Fundamental Scientific Research in the Russian Federation for the long term (2021-2030). The methodology of wine quality management with ecostatus has been created, aimed at revealing the individual characteristics of wines caused by natural factors and reducing the risks of negative effects on humans. Promising yeast strains have been identified: Steinberg, Champanskaya G-14, ShM-30, Novocimlyanskaya 3 with a description of their taxonomic affiliation, morphological and physiological-biochemical properties. Two strains of O. oeni active acid-reducing agents are recommended for practical use. The application of technology for the production of young sparkling wines of Crimean autochthonous grape The article presents the results of research activities for 2023 of the Federal State Budget Scientific Institution All-Russian National Research Institute of Viticulture and Winemaking Magarach of the RAS in the field of winemaking, carried out in accordance with the Program of Fundamental Scientific Research in the Russian Federation for the long term (2021-2030). The methodology of wine quality management with ecostatus has been created, aimed at revealing the individual characteristics of wines caused by natural factors and reducing the risks of negative effects on humans. Promising yeast strains have been identified: Steinberg, Champanskaya G-14, ShM-30, Novocimlyanskaya 3 with a description of their taxonomic affiliation, morphological and physiological-biochemical properties. Two strains of O. oeni active acid-reducing agents are recommended for practical use. The application of technology for the production of young sparkling wines of Crimean autochthonous grape varieties: Kokur belyi, Sary Pandas, Soldaiya and Kefesiya is justified. The system of criteria indicators for assessing the quality of grapes for the production of high-quality cognac distillates and cognacs is substantiated. A working collection of 63 natural strains of lactic acid bacteria has been formed. The optimal technological factors of the process of single-stage extraction by infusing with a food water-alcohol solution of green grape shoots of the Vitis vinifera, Vitis abrusca species have been established, allowing to increase the yield of total polyphenols by at least 2.6 times for the production of functional products. The most optimal technological modes of cold treatment of dry and fortified wine materials have been established to substantiate the constructive solution of an energy-saving installation for the purpose of cold treatment of wine materials based on the study of the main factors affecting the mass transfer process of potassium bitartrate crystallization. The obtained results of research work contribute to improving the quality of domestic wine products and expanding its production, including winemaking with ecological and geographical statuses, the production of domestic cognac and grape processing products of a functional orientation. The introduction of scientific developments into production will increase the competitiveness of domestic wine products, accelerate import substitution and ensure the country's food independence.

Mathematical modeling of obtaining cocoa butter substitute based on its comprehensive quality indicator

Vegetable oil is fundamentally different from other available products in its composition, components and other properties. Selection of optimal technological modes for producing a cocoa butter substitute based on its complex quality indicator. Therefore, it is important to conduct scientific research to improve quality. The complexity of the mechanism of the processes of hydrogenation and interesterification of cottonseed oil gives preference to mathematical models obtained by processing statistical data. Recommended purification methods differ from existing ones in priority and convenience. The problem of obtaining a cocoa butter substitute from vegetable raw materials is becoming very urgent. Optimal technological modes and compositions of processed raw materials for the processes under consideration.

Поддержание эффективной эксплуатации малодебитных скважин при разработке сеноманской залежи

The object of the study is the Cenomanian deposit during the period of self-damping of wells. The accumulation of droplet liquid causes destruction of the rock skeleton and increases pressure loss during gas movement in the well, which affects the dynamics of the operating stock indicators. The experience of introducing pipes with a diameter of 114 mm at the Yamburgskoye field increased the water-free period of well operation without self-pressure. Based on the available information on the development of the Cenomanian deposit, a forecast was made of the likely beginning of self-suffocation of the well stock for the current period until 2030. Thus, the results and forecast estimates showed that in almost all analyzed wells, conditions for water removal are maintained for a period of up to five years, and in some, waterless conditions will remain for more than ten years. Thus, it is recommended to replace the lift string for each specific well by analyzing its operating conditions and using temporary killing technology using special lightweight solutions that do not lead to contamination of the bottom-hole zone of the formation. During the development of Cenomanian deposits in the fields of the Far North, in the process of reducing reservoir pressure, fluid accumulation occurs at the bottom. For efficient operation of wells, it is necessary to create optimal technological operating modes for water removal and carry out measures to limit water inflows. Having analyzed various methods of combating self-squeezing of wells, it was concluded that in the conditions of development of the Yamburg field, the most effective is to replace lift pipes with pipes of smaller diameter, which allows increasing the rate of gas rise into the tubing and leads to self-cleaning of wells from liquid accumulating at the bottom.

Исследование оптимальных параметров наплавки при восстановлении валов электродвигателей

Repairing damaged or worn motor shafts is an important part of the restoration work faced by many industrial plants. In the manufacturing sector, keeping electric motors running optimally is essential to keeping production running smoothly and efficiently. To reduce the cost of purchasing new electric motor shafts in the event of their breakdown or wear, industrial enterprises use surfacing. The quality of the deposited layer is determined, among other things, by the surfacing method and its technological modes. This article discusses the problem of obtaining a high-quality layer when restoring electric motor shafts by surfacing in three ways: manual surfacing, semi-automatic surfacing in a protective gas environment and automatic submerged surfacing. The advantages and disadvantages of each surfacing method are determined. Optimal technological modes of surfacing (current strength and welding arc voltage) were established using various methods based on an experiment with determination of geometric parameters (weld width, weld height, weld penetration depth) and physical and mechanical properties of restored surfaces (hardness).

Development of an effective technology for producing composite wood-plastic board materials for construction and furniture purposes

This article presents the results of research in the development of an effective technology for obtaining composite wood-plastic board materials for construction and furniture purposes based on fillers from cotton stalks, which are agricultural waste, and polymer binders based on modified urea-formaldehyde and gossypol resins, epichlorohydrin, benzyl chloride, and polyvinyl chloride. The study revealed a correlation between the ultimate bending strength, tensile strength and water absorption with the parameters of pressing polymer-fillers of the mass. At the same time, to obtain composite wood-plastic board materials, it is recommended to use a urea-formaldehyde resin modified with reactive structuring additives as a binder. It has been established that the optimal technological mode for pressing the mass of polymer fillers and cotton stalks is: specific pressure 35 kg/m², pressing temperature 168-170°C, heating duration 7-10 minutes. Key words: technology, composition, modified urea-formaldehyde resin, cotton stem filler, wood-plastic board, specific pressure, pressing temperature, heating duration, water absorption, tensile strength.

Mathematical modeling of the technological process of twisting a waveguide

Twisted waveguides are part of waveguide paths of antenna- feeder devices of spacecraft. They have high requirements for accuracy and reliability. They are made of profiled rectangular pipes. The twisting of waveguide pipes with a cross- sectional size of less than 11x5.5 mm is carried out in the device using a rigid calibration mandrel. The calculation method determined the main parameters of the technological process of twisting the waveguide tube (torque M, drawing force Pпр). When twisting workpieces with cross sections according to GOST, the torques (M) and drawing forces (Pпр) from the cross- section sizes vary according to a nonlinear relationship. Twisting the workpiece from M4 requires less torque (M) and drawing force (Pпр) than for the workpiece from M1. By mathematical modeling, it is possible to select the optimal technological mode in advance, thereby ensuring high quality of waveguide twisting manufacturing. To substantiate the calculation results, the methods of control of technological parameters and quality control of the product manufacturing were considered. A problem has been found in measuring the torque and pulling force when twisting the workpiece. Therefore, the pulling force should be measured from the machine. A method for measuring torque using a non- contact torque sensor is proposed. The manufacturing quality is supposed to be carried out by the STRESSVISION mechanical stress scanner, and electrical tests.

STATIONARY MODE OF FLUID FLOW IN THE PIPELINE IN THE PRESENCE OF ASSOCIATED SAMPLING AND PUMPING

Pipeline transportation of oil and petroleum products plays a significant role in the transport system of the Russian Federation. When operating oil pipelines, reliability and energy efficiency are the most important criteria. To achieve these indicators, it is necessary to perform optimal technological modes. When constructing models of technological regimes, a methodology is used in which the movement of oil and petroleum products is considered as steady. Based on this assumption, the throughput, pump operating modes, strength characteristics and other parameters are determined. During the operation of the equipment, almost every day it is necessary to switch from one mode to another, which entails unsteady fluid movement for some time. At the same time, the unsteady mode makes up a small part of the total operating time of the system.The beginning of studies of unsteady fluid processes in pipes dates back to the last quarter of the 19th century. N. E. Zhukovsky made a fundamental contribution to the study of this problem. His classic work on water hammer in water pipes was the beginning for the creation of a large number of works in pipe hydraulics. The problem was solved for an ideal elastic fluid, i.e. without taking into account the friction forces against the pipe walls. The resulting formula, according to which the pressure increment is proportional to the velocity, has received numerous experimental confirmations for cases when it is possible to neglect pressure losses to overcome hydraulic resistances. N. E. Zhukovsky also obtained a formula for determining the sound velocity of a liquid droplet in a pipe with elastic walls. It is proved that this speed depends on the pipe material and its thickness.In the future, a large number of works were carried out to study the flow of liquid and gas in round pipes. The fundamental works of I. A. Charny, who obtained a mathematical model in the form of a system of partial differential equations of hyperbolic type, proved fruitful in this direction. Linearization of the equation, taking into account viscosity and hydraulic resistance allowed the researcher to obtain solutions to a number of engineering problems.The introduction of the Dirac function in the description of selectionpumping at specified points made it possible to describe processes in complex pipelines with one partial differential equation.This article discusses a horizontal section of the pipeline with sampling and pumping points. A stationary process for a drip liquid is considered. The problem is solved using the sine-Fourier transform.

Increasing the production efficiency of metal nanoparticles using electron beam deposition in a vacuum

Approaches to increase the efficiency of the use of materials that evaporate with subsequent deposition in a vacuum have been analyzed. The high efficiency and advantage of deposition from an evaporator with a directed vapor flow in a vacuum compared to a classical crucible evaporation scheme are shown. The optimal technological modes of deposition from the evaporator to achieve homogeneity of the directional steam flow were determined. The dependence between the temperature of the target, the efficiency of the evaporation scheme and the distance of the evaporator from the target was determined experimentally.

Single crystals and optical ceramics based on solid solutions of AgCl – AgBr – AgI system

The development of infrared (IR) and terahertz (THz) optical materials is work, that is connected with prospective applications in wide-spectral systems, medicine, IR and THz techniques. This work is focused on the development of new optical materials based on silver halides in the AgCl – AgBr – AgI system, selection of technological modes, preparation of single crystals and optical ceramics and investigation of their optical properties. The phase diagram of the AgCl – AgI system was refined, and a new phase diagram of AgCl – AgBr0.7I0.3 was investigated and constructed. In both diagrams, homogeneity and heterogeneity regions were found. In the AgCl – AgI diagram, the homogeneity region covers the concentration range from 0 to 7 mol. % AgI in AgCl, and the heterogeneity region from 7 to 98 mol. % AgI in AgCl. The phase diagram of AgCl – AgBr0.7I0.3 shows two regions of homogeneity in the concentration ranges of 0–49 and 78–100 mol. % AgBr0.7I0.3 in AgCl and one heterogeneous region from 47 to 87 mol. % AgBr0.7I0.3 in AgCl. In both systems in the regions of homogeneity it is possible to grow single crystals of the cubic NaCl crystal structure, space group Fm3m. For compositions of heterogeneous regions, it is possible to synthesize two-phase optical ceramics based on the cubic phase Fm3m and the hexagonal β-modification of AgI of wurtzite type (P63mc). The results of studies of phase diagrams of AgCl – AgI and AgCl – AgBr0.7I0.3 allowed us to determine the concentration ranges in the quasi three-component isothermal section of the AgCl – AgBr – AgI system. The obtained results allowed us to determine the compositions and select optimal technological modes, according to which single crystals of AgCl0.85Br0.10I0.05, AgCl0.72Br0.19I0.09, AgCl0.58Br0.29I0.13, AgCl0.97I0.03 and AgCl0.94I0.06 compositions were grown and optical ceramics of AgCl0.14Br0.60I0.26 composition were synthesized. The structure of the materials was determined by SEM analysis. The studied transmission ranges showed that single crystals and optical ceramics transmit radiation in the range from 0.48 to 41.7 μm and more with a maximum transparency level of up to 83 %. There are no absorption windows in the transmission spectra of the materials, which allows the developed optical materials to be used in the specified spectral ranges as transmission optics.

Modeling of a low-temperature gas treatment system

Objective. The main purpose of the work is: investigation of the effect of changes in technological parameters on the efficiency of the separation process and determination of optimal technological modes of operation of gas field X CNTS in the separation process.Method. The problem was solved in the KBC Petro-SIM computer program and the LTS model was built. To conduct the study, a model of the LTS was built in the KBC Petro-SIM computer program.Result. The results obtained with the help of it showed: with the current composition of the gas with a decrease in temperature for every 2oC, with other technological indicators being equal, the specific condensate yield increases in the range from 15 to 30%, and the lower the temperature, the higher this percentage. When the pressure on the throttle decreases by every 0.4 MPa, the condensate output increases, if the pressure drops below 1.8 MPa, the specific condensate output will begin to decrease, which is explained by the pressure drop below the maximum condensation line of the phase diagram. The change in gas flow within the design values did not affect the operation of low-temperature separation. At any available low temperature and high pressure at the inlet to the ILTS, the most optimal mode will be when the pressure after the throttle is maintained within 1.8 - 1.9 MPa. The maximum specific yield of gas condensate (48.21%) was obtained at a pressure at the inlet to the ILTS of 5.1 MPa, a temperature after the heat exchanger of minus 2oC and a pressure drop at the throttle of 3.05 MPa. As part of the numerical research, the following results were obtained: with an increase in the pressure at the inlet to the ILTC, the change in the specific output of the gas condensate is insignificant, but with this parameter it is possible to create a larger pressure drop on the throttle; with a decrease in the gas temperature at the outlet of the heat exchanger, the specific yield of the gas condensate will increase; with an increase in the pressure drop at the throttle, the specific output of the gas condensate increases until the pressure after the throttle reaches the range of values of 1.8 – 1.9 MPa. In this interval, the maximum specific condensate yield is achieved. With a further increase in the pressure drop on the throttle, the specific output of the gas condensate decreases. This is explained by the phenomenon of retrograde condensation, since the maximum condensation line is in the range of these pressures.Conclusion. Based on the results of the work, it was found that the developed software module can be used to solve the emerging series of problems. The results of the work show the suitability of the proposed method for practical purposes.

Optimization of the Extrusion Process in the Production of Compound Feeds for Dairy Cows

The paper proposes a way of enriching the composition of mixed fodder by combining two promising technologies with known effects: inclusion of germinated grain in the composition and extrusion. Crude and digestible protein, fiber, fat, and mineral elements Ca, K, Na, and P were studied. Inclusion of sprouted grain into mixed fodder and subsequent extrusion contribute to improvements in taste qualities, increased edibility, and assimilation of mixed fodder, as well as nutritive value. Taking into account the obtained knowledge about the influence of temperature regime and content of germinated triticale grain in mixed fodder production, it is advisable to continue research to adapt the technology and develop formulations for different types of animals and farm birds. The purpose of the study was to optimize the process of extrusion of sprouted triticale grain in order to reduce energy consumption and obtain high-quality extrudates. To achieve this goal, the following tasks were set: to analyze the regime factors affecting the fat content based on the optimization of technological modes of extrusion. To optimize the technology of extrusion of triticale grain of the Kozha variety, the fat content was chosen as the target function. Optimization of the technology of extrusion of triticale grain of the Kozha variety was carried out by the method of nonlinear programming. The following optimal technological modes of grain extrusion were obtained: The content of sprouted triticale grain is 15%, and the extrusion temperature is 140°C. With these optimal grain processing modes, the target function was 1.12%. The practical significance of the technology of the production of compound feeds with the use of extrusion in order to improve the quality and increase the shelf life. Doi: 10.28991/ESJ-2023-07-05-08 Full Text: PDF

Влияние ультразвукового воздействия на эффективность процесса обезжиривания жидких лецитинов

De-oiling fluid lecithin is a resource- and energy-intensive process that provides a phospholipid isolate with a high content of phospholipids. Ultrasonic exposure is one of the most effective and easy-to-implement physical methods that intensify this chemical-technological procedure. This article describes the effect of ultrasonic exposure on the efficiency of de-oiling fluid lecithins.
 The research featured soy lecithin (fluid, partially de-oiled, phospholipid isolate). The de-oiling process involved acetone as a solvent and included three 10-min stages at a temperature of 40°C. The ratio of lecithin:acetone (by weight) was as follows: stage I – 1:7, stage II – 1:6, stage III – 1:5. The systems of fluid lecithin – acetone and partially de-oiled lecithin – acetone underwent ultrasonic treatment during the de-oiling process at different specific power and exposure time. As a result of filtration, phases separated into an acetone solution of neutral lipids and phospholipids. The phospholipid isolate was dried in a vacuum oven at 5 kPa and 40°C. Each stage ended with the following measurements: the content of phospholipids in partially de-oiled lecithins, the content of phospholipids in the phospholipid isolate, and the extraction degree of neutral lipids after distilling the solvent from the acetone miscella.
 The specific power in the lecithin – acetone system was 0.28 W/cm3 at de-oiling stage I and 0.36 W/cm3 at stages II and III. Three minutes of ultrasonic exposure at stages I and II and two minutes at stage III reduced the acetone consumption by 1.2 times. The resulting phospholipid isolate yielded by 3.3% more phospholipids than the control sample, which presupposed no ultrasonic treatment.
 Ultrasonic exposure proved to be an effective and solvent-saving three-stage method that intensified the process of de-oiling fluid soy lecithin. The study specified the optimal technological modes for obtaining a phospholipid isolate with a high content of phospholipids (98.6%), which can be recommended as a food additive.

Decision support system for power cable insulation vulcanization production line management

The paper proposes a structural model of a decision support system for controlling a cable insulation continuous vulcanization line. The proposed decision support system is based on a mathematical model of the cable insulation continuous vulcanization technological process, a database, and a mode correction algorithm. The DSS will make it possible to quickly develop a new regime in case of using new materials or structures, as well as to correct the current regime in case of unplanned changes during the production process. The core of the DSS is the proposed mathematical model, which is based on conservation laws and is presented as a system of differential equations closed by boundary conditions. The vulcanization process is described taking into account the temperature-time dependence of the kinetic parameters, which made it possible to take into account the uneven heating of the cable, both in the radial direction and along the length. The numerical implementation of the differential mathematical model made it possible to carry out a systematic analysis of the nature of the processes in the vulcanization pipe and to evaluate the influence of various technological, structural and material parameters on the cable insulation vulcanization completion degree. As a result of the analysis, significant parameters were identified that significantly affect the vulcanization process completion degree. Based on the obtained numerical results, technological parameters dependence technological surfaces on the geometry of the product and the properties of the materials used were constructed, a regression mathematical model was proposed that allows determining the values of the process control parameters without resorting to the use of a differential mathematical model. Based on the results of the analysis, an algorithm for correcting the technological regime is proposed, taking into account only significant process parameters. The proposed algorithm allows you to adjust the value of the isolation rate, depending on external influences and deviations from the specified parameters. The results of the study can be used in the production of cable and wire products with vulcanizable insulation, when it is necessary to quickly select the optimal technological mode, take into account changes in the cable design, properties of the insulation material, as well as possible pressure deviations inside the vulcanization pipe.

Investigation of the Performance Properties of Parts Surfaces to Be Recovered by SemiAutomatic Hardfacing

The purpose of the study is to scientifically substantiate the choice of optimal technological modes of hardfacing of parts during restoration in order to ensure high performance of the operational stability of the deposited coatings. Mathematical dependencies have been obtained that make it possible to evaluate the effect of electric current strength, voltage and feed rate on the hardness and wear resistance of the deposited layer. The hardness and wear resistance of semi-automatic hardfacing with SV-08G2S wire in various technological modes are determined. The dependences of the coefficient of friction on the distance of passage of the counter body are established. For semi-automatic hardfacing with low-alloy wire, it was found that the optimal technological modes are: hardfacing speed – from 2 m/min, voltage – 135 V, amperage – 17.5 A. In this case, the hardness reaches a maximum value of 25.6 HRC, and the wear coefficient is 0.57