Stirring Temperature Research Articles

Study on the synergism mechanism of composite surfactants for oily sludge treatment using microemulsion method

The nonionic surfactant was considered to be the most effective surfactant for the treatment of oily sludge. In this paper, Tween20 and Span80 (T/S) composite surfactant was chosen as emulsifier for the preparation of microemulsion, and their synergistic effect was explored. Clint equation and molecular dynamics simulation was used to interpret the formation of mixed micelles and the results showed that T/S composite surfactant with the mass ratio of 11:1 exhibited the good synergetic effect. Then, the microemulsion prepared using composite surfactants was applied for the treatment of oily sludge. Under the optimal conditions of solid-liquid ratio of 1:1(g: mL), stirring temperature of 40 °C, stirring time of 30 min and stirring speed of 400 rpm, the residual oil rate was reduced to 0.25%, which was much lower than other reported results using chemical methods. Interface tensiometer and quartz crystal microbalance measurement showed that the interfacial tension decreased significantly after the addition of composite surfactant. This work provides a feasible strategy for oily sludge treatment using microemulsion, which promoted the development of oily sludge treatment processes based on microemulsion in practical industry.

Effect of Process Parameters on the Tensile Strength of the Developed Composite of Al 6065 in Stir Casting Process

There are numerous techniques of producing metal matrix composites (MMC) like infiltration, stir casting process, sinter-forging, diffusion bonding etc. Stir casting process is amongst the most known technique to synthesize MMC. In current study an agro-based MMC is prepared by stir casting process using waste eggshell and rice husk as primary and secondary reinforcements and Al 6065 as base material. Process parameters (PP) have a major impact on tensile strength of finally prepared composite. The major factors also called as process parameters in stir casting process that is having a determining impact in tensile strength of hybrid MMC are temperature as well as speed of stirring, duration of stirring and temperature at which the reinforcement is allowed to be poured. The primary aim behind the current work is to evaluate the optimal values of process parameters in friction stir casting process. 9 separate samples have been prepared at different PP for analyzing tensile strength of composite and these samples were machined as per the ASTM standards for performing the test of tensile strength. It was concluded that maximum tensile strength value was found at a stirring speed of 320 rpm, optimal stirring temperature was 630°C and the time of stirring was 25 minutes. At these values of PP, the tensile strength of prepared composite was improved by 35% in contrast to that of the base material.

Optimising Sodium Borohydride Reduction of Platinum onto Nafion-117 in the Electroless Plating of Ionic Polymer–Metal Composites

The effects of process parameters on the electroless plating of ionic polymer–metal composites (IPMCs) were studied in this work. Specifically, the NaBH4 reduction of platinum onto Nafion-117 was characterised. The effects of the concurrent variation of NaBH4 concentration, stir time and temperature on surface resistance were studied through a full factorial design. The three-factor three-level factorial design resulted in 27 runs. Surface resistance was measured using a four-point probe. A regression model with an R2 value of 97.45% was obtained. Surface resistance was found to decrease with increasing stir time (20 to 60 min) and temperature (20 to 60 °C). These responses were attributed to increased platinisation rates, resulting in more uniform electrode deposition, confirmed by scanning electron microscopy (SEM) and energy-dispersive X-ray (EDAX) analysis. Surface resistance decreased, going from 1% to 5% NaBH4 concentration, but increased from 5% to 10% concentration. This behaviour was attributed to surface morphology: increased grain size inducing porous electrodes, in line with findings in the literature. The maximum tip displacement, measured through a computer vision system, as well as the maximum blocking force, measured through an analytical balance setup, were obtained for all 27 samples. The varying results were discussed with regards to surface and cross-sectional SEMs, alongside EDAX analysis.

Surfactant-Free Synthesis of Melon Seed-Like CeO2 and Ho@CeO2 Nanostructures with Enriched Oxygen Vacancies: Characterization and Their Enhanced Antibacterial Properties.

To overcome the poor antibacterial performance of cerium oxide (CeO2) nanoparticles at low concentrations, melon seed-shaped CeO2 (MS-CeO2) and holmium (Ho)-doped CeO2 (Ho@MS-CeO2) nanoparticles were synthesized using a simple precipitation method without the addition of any surfactants. The surface morphology, phase structure, crystallinity, Ce3+ and Ce4+ valence, lattice defects, and reactive oxygen species (ROS) production of both synthesized nanostructures were examined using different techniques, i.e., scanning electron microscopy (SEM), energydispersive X-ray (EDX), resolution transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), Raman spectroscopy, ultraviolet (UV) spectra, fluorescence spectra, and zeta potential (ζ). The results show that under certain stirring and aging temperatures, CeO2 and Ho-doped CeO2 nanoparticles with a melon seed-like morphology can be prepared in a short period. Both nanoparticles were tested as antiseptic agents against G+ and G - bacteria (E. coli and S. aureus), and the results confirmed that the Ho@MS-CeO2 nanostructures exhibited remarkable antimicrobial activity at a low concentration (0.5 mg/L) compared with the control group, which is attributed to the reversible conversion of Ce3+ and Ce4+ in the ceria crystal lattice, enriched oxygen vacancy, ROS species production, and positive surface charge.

Exploring the Influence of Stirring Temperature on the Fatigue and Mechanical Characteristics of AA5128/SiC Nanocomposites

Aluminum is anticipated to continue being the primary material for various essential uses like aviation and automobiles. This is because of the great resistance to various climatic conditions, required and controllable mechanical qualities, and high fatigue resistance. Aluminum nanocomposites like AA5128/SiC can be produced by several liquid metallurgical techniques. The main challenges for this method in producing nanocomposites involve ensuring a consistent distribution of strengthening components and controlling any chemical interactions between the strengthening compositions and the matrix. Intended for structural use, specifically in the aircraft industry, developing cost-effective nanocomposites with operational and geometric flexibility poses a significant ongoing challenge. Various methods of producing AA5128/SiC nanocomposites yield distinct mechanical characteristics. Nine nanocomposites were synthesized in the current research by varying the stirring temperatures (810, 860, and 910℃) with different levels of SiC added at 0, 6, 8, and 10 wt %. The composite consisting of 10 wt % SiC and agitated at 860℃ showed improved characteristics in tensile, hardness, and fatigue tests. The composite containing 10 wt % SiC with a stirring temperature (ST) of 860℃ led to a 22.3% rise in tensile strength, a 16.2% rise in Vickers hardness number, and a 40.2% reduction in ductility compared to the sample without nanoparticles. At 810℃ (ST), the fatigue life at a stress level of 100 MPa raised by 18.5% compared to the 10 wt% nanocomposite.

Efficient extraction of metals (Fe, Zn, Pb) from hazardous jarosite using ionic liquid and waste-derived solvents.

The present study evaluated a solvo-metallurgical technique for metal extraction from industrial solid waste (jarosite) using ionic liquids (ILs) and waste-derived solvents. The jarosite contains a considerable amount of metal ions, namely iron, zinc, and lead. The jarosite was characterized by XRF, XRD, SEM, and FTIR techniques. The parameters affecting metal extraction, such as stirring time, acid molarity, and temperature, have been examined. Aliquat 336 was used to extract metals from fresh and roasted jarosite after equilibration with HCl. The response surface methodology (RSM) was used to optimize the parameters for the maximum metal extraction using [A336] [Cl]. Maximum extraction of iron (86.75%), zinc (51.96%), and lead (94.38%) from roasted jarosite was achieved at optimum conditions (125-min stirring time, 5M acid molarity, and 20ml/g liquid-to-solid ratio). Furthermore, the metal extraction was investigated using waste-derived solvents. The results show that waste-derived solvents, such as biomass and plastic pyrolysis oil, can effectively extract metals from fresh and roasted jarosite. Biomass pyrolysis oil achieved the highest extraction at 50°C for 90min, while plastic pyrolysis oil achieved the highest extraction at 50°C for 60min from roasted jarosite. These solvents are also cost-effective because they are made from waste plastic and biomass.

Optimizing the mechanical performance of A356–Sc–Sr alloy via combining machine learning and mechanical stirring under vacuum

In this study, a machine learning design system (MLDS) with a property-oriented optimization strategy was first established to predict the mechanical properties of the A356 alloys with adding Sc and Sr elements. Based on the experimental verification from the MLDS, the addition of 0.2 wt% Sc and 0.067 wt% Sr elements led to the refinement of α-Al grains and eutectic Si phases. Then, the vacuum–stirring was introduced to obtain the semi-solid microstructure of the A356–0.2Sc–0.067Sr alloy. The α-Al grains displayed the spherical morphology and the reduction in pores helped improve the mechanical properties of the alloy. In addition, the effects of stirring time and stirring temperature on the microstructure and mechanical properties of the alloy were investigated. The results demonstrated that the α-Al grains of the alloy were further spheroidized, resulting in the improved mechanical properties. The ultimate tensile strength and elongation of the alloy were 220 MPa and 6.0%, respectively, which were increased by 16.8% and 26.7% in comparison to those of the alloy without vacuum–stirring. The aim of this work is to provide a new method to prepare high-performance A356 alloy through composition design and microstructural control.

Inclusion of Hall and Ion slip consequences on inclined magnetized cross hybrid nanofluid over a heated porous cone: Spectral relaxation scheme

The cone geometry has a great significant for heat transmission in many industrial processes due to its ability to induce turbulence, enable directional flow, promote uniform temperature distribution, and offer versatility in applications. The current study aims to investigate the heat transport process of an inclined magnetized cross hybrid nanofluid over a heated porous cone under the influence of Hall and Ion slip consequences. Additionally, porous medium the flow is past under the effect of inclined uniform magnetic field and porosity of the medium is used to enhance heat transfer. The framed set of governing equations took the form of dimension free structure through appropriate transformations and then finally solved by an effective spectral relaxation method. Thermal impacts and heat transport mechanism associated with the hybrid flow is seen through different values of emerging parameters. Heat transport is seen higher with higher radiation parameters, as radiation and rising temperature are similar. Augmented values of Fr causes pressure drop in fluids which reduces the fluid motion and brings depreciation in velocity field. Eckert number also boosts the temperature of the fluid stirring via a porous rotating cone.

A new study on the effects of clay nanoparticles on the corrosion performance of Al-Si-Cu matrix composites in both acidic and alkaline solutions

In this paper, the influence of clay nanoparticles on the corrosion properties of the Al-Si-Cu matrix was investigated. The nanocomposite fabricating method was stir-casting when stirring times and temperatures were variables to change nanocomposite characteristics. Several corrosion tests were performed to examine the relationship between the microstructure and the degradation mechanism of various fabricated nanocomposites. Tafel polarization measurements indicated a lower corrosion rate for all nanocomposites compared to the Al-Si-Cu matrix in 0.1 M NaOH solution. The reduction range was 23.6–79.0% based on the smaller size of Si precipitates. In this situation, the interconnection of surface pores was lowest. However, electrochemical impedance spectroscopy (EIS) results showed that nanocomposite impedance would be increased up to 99.7% in comparison to the matrix without clay nanoparticles in 1 M HCl solution when the stirring temperature was 750 °C. EIS calculation also displayed that an increase (about 17.1–50.8%) in the nanocomposite resistance would be achieved when the stirring time was 2 min in 0.04 H2SO4 solution. The reason could be attributed to the larger size of Si particles since coarse precipitates were more effective agents to act as barriers for anodic dissolution of the lower layer of the Al-Si-Cu matrix when Tafel polarization tests demonstrated that the anodic reaction controlled the corrosion rate of the aluminum matrix.

One‐pot green approach for rapid and effective anionic dye remediation: encapsulation within alginate nanocapsules

AbstractBACKGROUNDThe encapsulation technique was applied to efficiently eliminate Congo red (CR) from aqueous solutions. During the ionotropic gelation between calcium (Ca2+) ions and alginate (AL), CR was effectively entrapped within the AL nanocapsules in a one‐step process. Suitable conditions for efficient CR removal via encapsulation were revealed by the systematic optimization of parameters including pH, time and stirring speed, etc.RESULTSAccording to the experimental observations, the stirring rate and temperature were found to have an insignificant effect on the encapsulation of CR molecules. When the pH value of the medium was 3, the highest level of encapsulation efficiency was achieved in a period of 15 min. At a preliminary CR concentration of 2000 mg L−1 and pH 3, the encapsulation efficiency was calculated at ≈98.9%, with an encapsulation capacity of 2800 mg dye g−1 AL. The zeta potential values of AL and CR/AL nanocapsules were determined to be +7.05 eV and −14.9 eV, respectively, and the results showed that the particles tended to agglomerate. TEM micrographs also showed that the nanocapsules were nanosized and agglomerated. Soil and UV degradation studies showed that the dye‐entrapped nanocapsules degraded remarkably. These results highlighted the great potential of encapsulation for dye removal in economical and practical applications.CONCLUSIONEncapsulation was confirmed to be an economical and practical technique for effectively eliminating CR from aqueous solutions. Under UV light irradiation, the dye molecules entrapped within alginate nanocapsules displayed photodegradation. © 2024 Society of Chemical Industry (SCI).

The Physicochemical Basis for the Production of Rapeseed Oil Fatty Acid Esters in a Plug Flow Reactor

This article describes the results of a comprehensive comparative study of the production of fatty acid ethyl esters (FAEEs) for use as biodiesel in perfect mixing reactors (PMRs) and plug flow reactors (PFRs). The products obtained on a laboratory scale at all stages of the separation and purification of the FAEE phase were analyzed using the FTIR, XRF and GC-MS methods. We compared distillation methods for the separation of stoichiometrically excessive ethanol from the reaction mixture. Neutralization methods with H2SO4 solution and carbonation with CO2 were applied for FAEE phase purification from the catalyst. Emulsions formed during the water flushing stage were analyzed via the optical microscopy method. The optimal conditions of stirring speed and temperature were selected to maintain a high level of FAEE–water phase contact area with minimum phase separation time. The efficiency of the carbonation method for catalyst neutralization in the FAEE phase has been proven, allowing us to consider this method as an alternative to the traditional acid neutralization method. According to the results of experimental studies, we have developed a new high-performance technological scheme for the production of fatty acid esters in PFRs. The synthesis of FAEEs in a stoichiometric excess of ethanol of about 1:50 allowed us to increase the reaction rate and productivity of the synthesis unit after the transition from a PMR to a PFR. The yield of the product amounted to 86.7%. The purified FAEE fraction complied with most EN14214 specifications.

OPTIMISATION OF MOGAR GRAIN COOKING METHOD FOR PRODUCTION OF FOOD CONCENTRATE «TALCAN»

The possibility of using mogar grain for the production of food concentrates based on the traditional national dish "Talkan" is considered. "Talkan" is a national food concentrate that has been used for centuries as a staple food for long-distance trekking by representatives of various cultures. Traditionally, talkan is prepared from various cereals, especially millet, wheat and barley. Adding boiling water and butter makes a hearty porridge, and adding butter and sugar makes a delicious dessert.The difficulty lies in the careful handling and preparation of the mogar grain. When cooked intensively, the grain can easily overcook, resulting in all the valuable nutrients being leached into the broth. In addition, improperly prepared mogar can burn during further roasting. To determine the optimal parameters of mogar hydrothermal treatment and to create a high-quality food concentrate based on the national dish "Talkan", a complex experiment was conducted using modern methods of experiment planning.The experiment tested a number of variables including temperature limits and duration of cooking, as well as temperature, duration and intensity of stirring during drying and roasting of mogar. The study showed that the most favourable conditions for mogar grain include cooking at an initial temperature of 15-20 °C for about 60 minutes, gradually reaching 100°C.The established methods of hydrothermal treatment served as a basis for the development of specialised equipment for the preparation of mogar grain to produce tulkan.

Silver Nanoparticles From Cassia alata L. Incorporated to Coconut Oil‐Oleogel Based Ointment As An Alternative for Diabetes Mellitus Wound Healing: Optimization, In Vitro and In Vivo Tests

AbstractDiabetes mellitus, a widespread chronic illness categorized by elevated blood sugar levels, poses a significant health burden. This study aimed to synthesize an optimal oleogel formula and investigate its impact on accelerating diabetic wound healing through a multidimensional approach. The evaluation spanned in vitro examination utilizing bacterial cultures, and in vivo assessments on mice, involving a meticulous 9‐day observation of wound healing percentages. The successful synthesis and characterization of AgNPs and Na‐CMC laid the foundation for further exploration. Oleogel formulation optimization using Response Surface Methodology (RSM) revealed the most effective composition featuring Na‐CMC at 4.5 %, beeswax at 12.5 %, and a stirring temperature of 80 °C. Manufacturing success was affirmed through comprehensive testing encompassing pH, organoleptic properties, dispersion, gelation time, and FTIR analyses. Characteristics of extracted nanoparticles were scrutinized through SEM‐EDX, PSA, and Zetapotential tests. In vitro evaluations showcased the commendable antibacterial activity of AgNPs. Notably, in vivo observations highlighted the superior wound healing capabilities of oleogel ointment enriched with AgNPs. These findings collectively underscore the promising potential of the synthesized oleogel in promoting the healing process for diabetic wounds, validated through diverse analytical approaches, marking a significant stride toward effective therapeutic interventions in diabetes‐related wound management.

Optimization on stir casting process parameters of Al7050 based composites using Taguchi technique

Aluminium Alloy Metal Matrix Composites (AAMMCs) are broadly used for various applications such as aerospace, military, marine, transport and automobile applications. Aluminium alloys are not sufficient for satisfying the needs of the fastest growing industries. The more combination of properties are needed for fulfil the need of fastest growing countries. The input process parameters of fabrication methods of composites are more important in connection with mechanical and tribological properties. In this research, optimization on stir casting input process parameters of AA7050/4wt.%WC composite was done by utilizing the Taguchi technique. The melting temperature (650, 700 and 750 °C), stirring speed (150, 200 and 250 rpm) and stirring duration (10, 20 and 30 min)were selected as input parameters to optimize the stir casting input process parameters. The chosen response parameter for the investigation was wear loss. The wear test was conducted by using pin on disc setup at the condition of 2500 m sliding distance, 25 N applied load and 1.5 m/s sliding velocity. The optimized input process parameters of stir casting is high level of melting temperature (750 °C), low level of stirring speed (150 rpm) and low level of stirring duration (10 min). The increasing of melting temperature decreases the wear loss and increasing of stirring duration and stirring speed enhances the wear loss due to accumulation of reinforcements in the matrix AA7050. The contribution percentage of melting temperature, stirring speed and stirring duration is 81.02 %, 12.4 % and 6.4 % respectively. The high strength MgZn2 precipitate was formed while using optimized stirring temperature, stirring duration and stirring speed and it was confirmed by XRD. The SEM image of AA7050/4wt.%WC confirmed that uniform distribution of WC in matrix AA7050 material and it caused to offer higher wear resistance. The obtained low wear loss for confirmation test specimen is 16 mg.

Optimization of stir casting parameters for the tensile behavior of nano Al2O3 and ZrO2 reinforced Al-Mg-Si alloy metal composites

Stir casting is a frequently used method in the metallurgical process of casting aluminium composites. The microstructure and performance of the composites are influenced by the stirring casting parameters. The majority of research conducted in this area focused on producing composites using stir casting parameters that were predetermined, without utilizing an optimization method. This work aims to optimize the stir casting parameters for the manufacturing of Al-Mg-Si (Al6061) alloy reinforced with hybrid nano Al2O3 and nano ZrO2 in order to enhance its performance. The Taguchi optimization technique was employed to analyze the important effects of stir casting parameters on the ultimate tensile strength of a hybrid metal matrix composite. The composites were produced by the ultrasonic aided stir casting method, employing a set of process parameters determined by the Taguchi L16 orthogonal array. The S/N (Signal to Noise ratio) and Regression model were utilized to determine the optimal values and assess the influence of process parameters on the tensile qualities. The Minitab 21 software was utilized to perform simultaneous optimization of the attributes. The findings indicated that the composition of the nano reinforcement, stirring temperature, stirring speed, and stirring time all had a substantial impact on improving the UTS (Ultimate Tensile Strength) of the material.

Experimental investigation and optimization of morphological characteristics in mechanically agitated aluminium 6061‐fly ash cenosphere composite

AbstractThe current work examines the results of an experimental study for the liquid casting of an aluminum‐6061‐5 weight % fly ash cenosphere composite by employing stir casting. The studies were conducted using the response surface methodology (central composite design L16 experiments) with three process factors (stirring temperature, stirring speed, and stirring time) at three different levels. An attempt has been made to determine the impact of process variables on the degree of sphericity and particle size. The optimal processing conditions for the best degree of sphericity (0.765) and particle size (93.227 μm) are identified as A−1, B+1, and C+1, corresponding to a stirring temperature of 670 °C, a stirring speed of 600 min−1, and 15 min stirring time. Based on the analysis of variance analysis, the degree of sphericity and particle size evolution is significantly influenced by stirring time followed by temperature and speed. Additionally, a mathematical model for the evaluation of the degree of sphericity and particle size in the primary‐aluminium phase has been developed and it shows good consensus with the experiments.

Highly efficient arsenic adsorption onto Mg/Al/Fe layered double hydroxides: Kinetics, isotherm, XPS and Mössbauer spectroscopies

The adsorption of arsenate onto a Mg/Al/Fe layered double hydroxide (Fe-LDH) was studied at different anion concentration, pH, temperature and stirring rate. Different characterization techniques such as FT-IR, X-ray diffraction, XPS and Mössbauer spectroscopies, and zeta potential measurements were used for determining the mechanism of arsenate adsorption onto the studied solid. Two mechanisms are postulated: a) anion exchange reactions with chloride and hydroxyl ions of the interlayer space, and b) ligand exchange reactions with formation of inner-sphere complexes on the Fe-LDH surfaces, with participation of Fe(III) ions from the structure. Arsenate adsorption on Fe-LDH was dependent on the initial pH and the concentration, but was independent of the stirring rate and temperature. Fe-LDH exhibited excellent As(V) removal capacity, much higher than other adsorbents reported in the literature. A dose of 10 g L−1 Fe-LDH was sufficient to reach a percentage removal higher than 95 % for a concentration of arsenic of 1 × 10−4 M found in certain places in Argentina, obtaining residual arsenate values below the recommended World Health Organization limit (0.01 mg L−1). Although the material dissolves at low pH, its high arsenate removal efficiency, the low cost and the green and sustainable characteristics of the material make it an effective adsorbent for the treatment of arsenic contaminated waters.

Effect of temperature and agitation on the enzymatic synthesis of oligosaccharides and dextran in orange juice

The production of prebiotic fruit juices has been extensively investigated, mainly by the enzymatic route. However, studies involving agitated reactors and other important parameters are lacking. This work evaluated the effect of temperature and agitation on the synthesis of oligosaccharide and dextran in orange juice using dextransucrase. The syntheses in orange juice were carried out in magnetic and mechanic stirred-tank reactors at 25 (MAG25, MEC25) and 30°C (MAG30, MEC30) for 24 h. A low final sucrose concentration was found at 6h for magnetic stirring and low temperatures. The reducing sugar concentration decreases at 25°C and increases at 30°C throughout the process. Results showed higher oligosaccharide and dextran production at 25°C. Magnetic agitation (MAG) favored the dextran synthesis over the mechanic agitation (MEC) at the same temperature. MAG25 and MEC25 provided similar concentrations of oligosaccharides at 6h. Although MAG25 and MEC25 were the best conditions to synthesize oligosaccharides and dextran in orange juice, MEC25 is more suitable and feasible for large-scale production.

On the factors affecting the swelling behavior of superabsorbent polymers in cement-related environment

Superabsorbent polymer (SAP) has water absorption and release behavior and can be used as internal curing or self-healing additive in cement-based materials. However, SAP has complicated and changeable swelling behaviors in cement-based materials, which has not been fully investigated. In present work, an AA-AM co-polymerized SAP was synthesized, and potential factors related to cement-based materials, including water-cement ratio and binder type, superplasticizer content, early hydration time, mixture stirring rate, temperature and pressure, were systemically investigated. Results indicated that maximum absorptivity of SAP decreased gradually with hydration time. SAP presented the highest absorptivity in FA and GGBS blended cement binder, and the lowest absorptivity in geopolymer, although the water-binder ratio is the same. The swelling behavior of SAP is related to the PCE content, and maximal SAP absorptivity first rises and then falls as PCE content increases. As the stirring rate increases, SAP's maximal absorptivity increases, due to the “Bernoulli's effect”. In addition, the absorptivity of SAP showed temperature and pressure sensitivity, which was improved by the increased temperature or decreased external pressure. The findings in present work suggest that potential factors related to cement-based environment should be comprehensively considered for practical application of SAP in concrete engineering.

Optimization of the method of hydrothermal treatment of mogar grain for production of food concentrate "Talkan"

The possibility of using mogar grain for the production of food concentrates based on the traditional national dish "Talkan" is considered. "Talkan" is a national food concentrate for Republic of Kazakhstan, which has been used as a staple food in long-distance trekking by various cultures for centuries. Traditionally, talkan is prepared from various cereals, particularly millet, wheat and barley. When boiling water and oil are added, it turns into a hearty porridge, and when oil and sugar are added, it becomes a delicious dessert. The difficulty lies in the careful handling and preparation of the mogar grain. During intensive cooking, the grain can easily overcook, resulting in all the valuable nutrients being leached into the broth. In addition, improperly prepared mogar can burn during further roasting. To determine the optimal parameters of mogar hydrothermal treatment and to create a high-quality food concentrate based on the national dish "Talkan", a complex experiment was conducted using modern methods of experiment planning. A number of variables were tested during the experiment, including temperature limits and duration of cooking, as well as temperature, duration and intensity of stirring during drying and roasting of mogar. The study showed that the most favourable conditions for mogar grain involve cooking at an initial temperature of between 15–20 °C for about 60 minutes, gradually reaching 100 °C. The drying and roasting processes are best carried out for 25 minutes, with a layer thickness of 25 mm and a surface temperature of 250 °C. The determined of hydrothermal treatment serve as a basis for the design of specialised equipment for preparation of mogar grain for the purpose of making Talkan