Oil Mixture Research Articles

Experimental Characterization and Evaluation of Crude Spiking Influence on Oil/Water Dispersed Flow in Pipe.

This study centers around examining the impact of introducing varying (small) quantities of crude oil into mineral oil (Exxsol D60) on the resultant properties of dispersions and emulsions in oil-salty-water mixture properties such as rheology, droplet size distribution, separation duration, and interfacial tension. The experimentation encompassed bottle tests and a compact flow loop configuration featuring a 2 m horizontal pipe segment. The findings indicate that blends of oil infused with crude oil, combined with salty water at water ratios of 25% and 50%, necessitate an extended duration for separation and for the establishment and stabilization of interfaces, in contrast to mixtures of unaltered oil and saline water. To illustrate, in samples with spiking concentrations ranging from 200 to 800 ppm within a 25% water fraction, the separation period escalates from 51 s to 2 min and 21 s. Interestingly, when the water fraction increased to 75 percent, the impact of crude oil spiking on separation time was minimal. The analysis revealed that the Pal and Rhodes emulsion viscosity model yielded the most accurate predictions for the viscosity of resulting emulsions. The introduction of crude oil spiking elevated emulsion viscosity while diminishing interfacial tension from 30.8 to 27.6 mN/m (800 ppm spiking). Lastly, a comparative assessment was performed between droplet size distributions in the devised dispersed pipe flow and observed in an actual emulsion system comprising crude and salty water.

Comparative study of the antioxidant properties of organic and inorganic melissa

The object of research is organic and inorganic lemon balm. The subject of research is the antioxidant properties of these plants. One of the most problematic areas is that organic products have a slightly different chemical composition, which is due to the lack of fertilizers during their cultivation. The research hypothesis is that organic plants naturally release more phenols and polyphenols, which are needed to fight pests. At the same time, polyphenol compounds have antioxidant properties.
 The work investigated the total content of polyphenols in organic and inorganic lemon balm. The content of polyphenols in terms of gallic acid was determined by the spectrophotometric method by reaction with the Folin-Chocalteu reagent. In order to determine the antioxidant properties, the content of the peroxide number and the acid number of the fatty base during storage were determined. As a fat base, a mixture of organic butter and organic rye oil was chosen in a ratio of 75:25. Dried lemon balm was added in the amount of 4 % to the mass of fat. Changes in the fat base were determined in three samples: without the addition of lemon balm, with the addition of dried inorganic and organic lemon balm. The samples were stored in a thermostat at a temperature of 50 °C for 10 days. Studies were conducted every 2 days. The amount of peroxides was determined by the iodometric method. The acid number content was determined every 5 days by the titration method. It has been established that organic lemon balm has better antioxidant properties. This is due to the content of polyphenolic substances. So, the content of polyphenols in ordinary lemon balm is 14.1 mg/g, and in organic – 26.5 mg/g. Research has established that the value of the peroxide number after 10 days of storage was 17 ½O for the sample with the addition of organic lemon balm and 22 ½O for the sample with the addition of ordinary lemon balm. The sample without the addition of lemon balm had a value of 25 ½O. The value of acid number of fat on the tenth day of storage was 1.4 for the sample with the addition of inorganic lemon balm and 1.1 for the sample with the addition of organic lemon balm. Further research is planned to be devoted to the effect of plant organic antioxidants on the lipid fraction of food products.

Production of Biodiesel Using Enzymatic Esterification of Multi-Feedstock Oils

Biodiesel is produced from oils esterified with alcohol into glycerol and water. Vegetable edible oil raw materials are the main consideration in biodiesel production. This study used three types of oil, namely palm oil (PO), waste frying oil (WFO), soybean oil (SO), and corn oil (CO), with the catalyst of the enzyme lipase. The price of WFO as raw materials is low, although it must be controlled acid and water levels. In the research run, the oil mixture consists of two types of oils mixed with a certain composition and the addition of certain lipase enzymes. The research resulted that the yield produced by multi-feedstock biodiesel with free fatty acid (FFA) < 2 was 89.7%, 89.03%, and 86.11% higher than the sample with FFA > 2 at 79.54%, 74.66%, and 73.33%, respectively. The minimum density produced is a mixture of WFO with CO of 861.1 kg/m3. The largest viscosity produced is a mixture of WFO with SO of 18.03 mm2/s. Mixing raw materials can lower the number of iodine multi-feedstock biodiesel. The number of acids produced by multi-feedstock biodiesel exceeds ASTM standards. The total glycerol produced by multi-feedstock biodiesel varies, whereby a multi-feedstock blend of PO can lower total glycerol. In contrast, a multi-feedstock blend of WFO tends to produce high total glycerol.

Natural preservatives for hams: Essential oil mixtures and major compounds' efficacy against Clostridium sporogenes

AbstractThe demand for healthier products by consumers has prompted research into the use of essential oils (EOs), which are known for their antimicrobial properties. This study investigated the antimicrobial properties of EOs as a potential alternative to synthetic preservatives, specifically, cinnamon, clove, and oregano EOs, as well as their majority compounds (cinnamaldehyde, eugenol, and carvacrol) on Clostridium sporogenes inoculated in hams. The findings of the study revealed that cinnamon EO and its major compound cinnamaldehyde were the most efficient in inhibiting the growth of C. sporogenes, demonstrating the lowest minimum bactericidal concentration MBC (0.1%). The combination of oregano EO, cinnamon EO, cinnamaldehyde, and carvacrol led to a significant decrease in bacterial growth (approximately 3 log) after 28 days in hams. Furthermore, the presence of spores was not observed for 14 days (at 14°C) and 21 days (at 7°C) of storage, indicating a delay in sporulation. The treatments using the combination of EOs, and their major compounds had minimal impact on the color of the hams while maintaining the physicochemical characteristics of the product. This study demonstrates that EOs and their major compounds can be applied as natural preservatives in ham, offering a potential alternative for reducing the use of nitrites in various food types. The research emphasizes the antibacterial efficacy of cinnamon, clove, and oregano EOs, along with their major compounds, in inhibiting C. sporogenes in ham. The findings indicate that these natural alternatives could be valuable in preserving food products and reducing the reliance on synthetic preservatives.

Incorporating carrot pomace-based emulsion to enhance the nutritional value and shelf life of butter

ABSTRACT Carrot pomace, a byproduct of juice extraction from the widely cultivated root vegetable, contains micronutrients and carotenoids that are often discarded as agricultural waste. To address this issue, the present study aimed to create a stable carrot pomace-based emulsion (CPBE) suitable for use in butter production and to evaluate its impact on the physicochemical, microbiological, thermal, oxidative, and fatty acid properties of butter. The CPBE was made with a natural emulsifier and a dispersion medium made of a mixture of vegetable oils in a certain ratio to get the most components, like carotenoids, probiotic culture, and omega-3 fatty acids. The emulsion was selected based on particle size, zeta potential, and color values. Compared to the control sample, the addition of CPBE altered the content of moisture, carbohydrate, protein, and fat, resulting in a higher calorie count. The addition of CPBE also improved the oxidative stability of butter and inhibited the growth of coliforms, Staphylococcus aureus, and psychotropic bacteria during storage, and its biological value increased while its spreadability decreased. Although the color scores were impacted by CPBE, overall acceptability was unaffected. The study shows that the use of CPBE in butter production has potential applications in the functional food industry.

Hepatic Hypertrophy in Normal and Cirrhotic Livers Following Portal Vein Embolization: Comparative Assessment of 2 Different Embolic Regimens in a Large Animal Model

PurposeTo compare the mechanistic effects and hypertrophy outcomes using 2 different portal vein embolization (PVE) regimens in normal and cirrhotic livers in a large animal model. Methods and MaterialsThe Institutional Animal Care and Use Committee approved all experiments conducted in this study. Fourteen female Yorkshire pigs were separated into a cirrhotic group (CG, n = 7) and non-cirrhotic group (NCG, n = 7) and further subgrouped into those using microspheres and coils (MC, n = 3) or n-butyl cyanoacrylate (nBCA, n = 3) and their corresponding controls (each n = 1). A 3:1 ethiodized oil and ethanol mixture was administered intra-arterially in the CG to induce cirrhosis 4 weeks before PVE. Animals underwent baseline computed tomography (CT), PVE including pre-PVE and post-PVE pressure measurements, and CT imaging at 2 and 4 weeks after PVE. Immunofluorescence stainings for CD3, CD16, Ki-67, and caspase 3 were performed to assess immune cell infiltration, hepatocyte proliferation, and apoptosis. Statistical significance was tested using the Student’s t test. ResultsFour weeks after PVE, the percentage of future liver remnant (FLR%) increased by 18.8% (standard deviation [SD], 3.6%) vs 10.9% (SD, 0.95%; P < .01) in the NCG vs CG. The baseline percentage of standardized future liver remnant (sFLR%) for the controls were 41.6% for CG vs 43.6% for NCG. Based on the embolic agents used, the sFLR% two weeks after PVE was 58.4% (SD, 3.7%) and 52.2% (SD, 0.9%) (P < .01) for MC and 46.0% (SD, 2.2%) and 47.2% (SD, 0.4%) for nBCA in the NCG and CG, respectively. Meanwhile, the sFLR% 4 weeks after PVE was 60.5% (SD, 3.9%) and 54.9% (SD, 0.8%) (P < .01) and 60.4% (SD, 3.5%) and 54.2% (SD, 0.95%) (P < .01), respectively. Ki-67 signal intensity increased in the embolized lobe in both CG and NCG (P < .01). ConclusionsThis preclinical study demonstrated that MC could be the preferred embolic of choice compared to nBCA when a substantial and rapid FLR increase is needed for resection, in both cirrhotic and non-cirrhotic livers.

The influence of ripening of semi-hard goat cheese in oil on its physicochemical composition and sensory properties

The aim of this paper was to determine the influence of ripening of semi-hard goat cheese in oil (mixture of Mljet's extra-virgin olive oil and refined sunflower oil; 50:50) on its physicochemical composition and sensory properties, as well as to determine the optimal time of immersion of the cheese in oil. Five batches of cheeses were produced, and the cheeses of the same batch were randomly divided into 3 groups according to the ripening method: (1) ripening in air (control group, treatment 1), (2) ripening in oil after 10 d of ripening in air (treatment 2), (3) ripening in oil after 20 d of ripening in air (treatment 3). Cheeses were sampled during ripening at d 0, 10, 20, 30, 45, and 60, and physicochemical analyses were performed. Oil as a ripening medium for cheese prevented water loss from the cheese (groups 2 and 3), and the significantly lowest contents of dry matter, protein, fat, saturated fatty acids (SFA), unsaturated fatty acids (UFA), oleic acid, and salt were found in group 2. Group 3 had the highest contents of fat, SFA, UFA, and oleic acid. Prolonged ripening of the cheese in air before immersion in oil resulted in greater water loss and the formation of such cheese structure that allowed oil to penetrate the cheese. Water retention and oil penetration into the cheese altered the physicochemical composition of the goat cheese, having a significantly positive effect on the sensory characteristics, particularly color, texture, and taste, allowing the cheese to be consumed even when goat milk is not produced due to seasonality.

Impact of ultrasonic mixing on virgin and waste vegetable oils for biodiesel production

This paper investigates the use of waste vegetable oil (WVO) for production of biodiesel. The study explores the improvement of biodiesel production using ultrasonic mixing to achieve high yields. Different oil streams, including virgin canola oil and WVO, were used as the raw material for the transesterification processes. These oils had different fatty acid contents as a result of environmental or previous processing conditions. The impact of free fatty acid (FFA) content on the resulting yield was assessed. It was demonstrated that the yield was influenced by production parameters such as reaction time, reaction temperature, molar/volume ratios of oil to alcohol, catalyst amount, and mechanical mixing. This was accomplished by automating the biodiesel production from WVO, thereby achieving improved processing and requiring minimal direct human involvement. A biodiesel production apparatus was developed with a Raspberry Pi 3 microcomputer to control the process. The particular choice of these process parameters depended on the particular oil type. This research used mixtures of virgin and waste vegetable oils at different volume ratios (oil to alcohol) of 4:1, 6:1, and 8:1, which was determined by the FFA content of the oil. In addition to mechanical mixing, ultrasonication rated at 500 W, 20 kHz was used to enhance mixing by adding 450 kJ to the process, thereby reducing both the processing time and the amount of methoxide needed to perform a base-catalyzed transesterification. This research demonstrated that optimal yield depends on temperature, catalyst concentration, FFA content of the oil, and the energy introduced by sonication.

Extraction of cadmium from aqueous solutions by emulsion liquid membrane (ELM) using three different carriers dissolved in a 70:30 ratio of sunflower oil to kerosene

This study explores the use of novel green emulation liquid membranes (GELMs) for the simultaneous extraction and stripping of Cd (II) from aqueous solutions. A solute is transported through the membrane due to the presence of the carrier and then concentrated in the internal phase. Soybean, sunflower, corn, and canola oils were used to form green substitutes to petroleum-based organic diluents for use as GELMs. Bis-(2-ethylhexyl) phosphate (D2EHPA), tri-butyl- phosphate (TBP), and trioctylamine (TOA) were the extractants, span 80 was the emulsifier, and HCl or H2SO4 was used as the stripping agent. The best conditions for maximum extraction efficiency (98.68%), stripping efficiency (97.14%), and lowest membrane breakage (0.9%) were achieved using a mixture of sunflower oil and kerosene in the ratio of 70:30. The other optimum values of the variables were: 2% (v/v) Span 80, 10 min emulsification time, 12700 rpm emulsification speed, 400 rpm of agitation speed, 5% (v/v) D2EHPA, an external phase pH was 3.5, an internal phase of 0.25 M HCl, and 5:1 of the treat ratio (external phase to emulsion) at 10 min contact time. The synthesized membrane was reused eight times, with approximately the same efficiency and no significant breakage during the first seven cycles.

Single-Bubble Rising in Shear-Thinning and Elastoviscoplastic Fluids Using a Geometric Volume of Fluid Algorithm.

The motion of air bubbles within a liquid plays a crucial role in various aspects including heat transfer and material quality. In the context of non-Newtonian fluids, such as elastoviscoplastic fluids, the presence of air bubbles significantly influences the viscosity of the liquid. This study presents the development of an interface-capturing method for multiphase viscoelastic fluid flow simulations. The proposed algorithm utilizes a geometric volume of fluid (isoAdvector) approach and incorporates a reconstructed distance function (RDF) to determine interface curvature instead of relying on volume fraction gradients. Additionally, a piecewise linear interface construction (PLIC) scheme is employed in conjunction with the RDF-based interface reconstruction for improved accuracy and robustness. The validation of the multiphase viscoelastic PLIC-RDF isoAdvector (MVP-RIA) algorithm involved simulations of the buoyancy-driven rise of a bubble in fluids with varying degrees of rheological complexity. First, the newly developed algorithm was applied to investigate the buoyancy-driven rise of a bubble in a Newtonian fluid on an unbounded domain. The results show excellent agreement with experimental and theoretical findings, capturing the bubble shape and velocity accurately. Next, the algorithm was extended to simulate the buoyancy-driven rise of a bubble in a viscoelastic shear-thinning fluid described by the Giesekus constitutive model. As the influence of normal stress surpasses surface tension, the bubble shape undergoes a transition to a prolate or teardrop shape, often exhibiting a cusp at the bubble tail. This is in contrast to the spherical, ellipsoidal, or spherical-cap shapes observed in the first case study with a bubble in a Newtonian fluid. Lastly, the algorithm was employed to study the buoyancy-driven rise of a bubble in an unbounded elastoviscoplastic medium, modeled using the Saramito-Herschel-Bulkley constitutive equation. It was observed that in very small air bubbles within the elastoviscoplastic fluid, the dominance of elasticity and capillary forces restricts the degree of bubble deformation. As the bubble volume increases, lateral stretching becomes prominent, resulting in the emergence of two tails. Ultimately, a highly elongated bubble shape with sharper tails is observed. The results show that by applying the newly developed MVP-RIA algorithm, with a tangible coarser grid compared to the algebraic VOF method, an accurate solution is achieved. This will open doors to plenty of applications such as bubble columns in reactors, oil and gas mixtures, 3D printing, polymer processing, etc.

Mistreatments Of Autism Spectrum Disorder.

The Editor, Autism Spectrum Disorder (ASD) is an umbrella, constructed to describe difficulties in social communication, with a very confined range of interests and fixed patterns along with atypical sensory-motor behaviors beginning in early childhood. It is estimated that over 350,000 children are on the spectrum in Pakistan, and the prevalence continues to rise(1). Research and studies have shown that early intervention has a positive effect on the later development of children on the spectrum (2). In a child’s life, a sensitive stage of development called the critical period is the time when new connections (synapses) are made that are influenced by environmental stimuli and personal experiences of the child (3). Established diagnosis and intervention in this period influences the brain’s neural plasticity. Hence filling the gap between the child’s growth margin and typically developing peers and supporting their way into adulthood with the competencies necessary to live an independent and carefree life. In underdeveloped nations like Pakistan, there is inadequate knowledge and awareness of ASD. Children are misdiagnosed and caregivers are deluded into the thought of a cure of autism due to the existence of various superstitions and necromantic beliefs(4). Different oil mixtures, herbal medicines, and several other home remedies are practiced: some to elude over-sensitivity or under-sensitivity, some to magically make the child speak etc. However, these practices have no effect, other than losing precious years of the child’s life (5). Parents and caregivers of autistic children should be counseled that ASD is not a disease to cure but a way to adapt. They should be convinced that being autistic is not because some pathogen invaded the brain; rather it is because the brain is wired differently and functions at its own pace. Seminars and webinars should be held for caregivers to help them deal with the psychosocial issues and the social stigma surrounding ASD. There is also a need to create awareness at the government level to better equip people, professionals, and healthcare systems to better cater for the needs of children with ASD. Moreover, efforts should be made to make ASD screening a part of universal pediatric screening so that intervention is provided as early as possible. There is a growing need to understand that ASD is not a curse manifested but an individuality to celebrate.

The Stimulatory Effect of Mixtures Milk Thistle and Wild Safflower Oil with some Insecticides on the Adults and Larvae of Flour Beetles

Abstract The aim of the current study is testing the mortality effect of mixtures of Milk thistle and Carthamus tinctorius oils with some insecticides on the whole and larvae of flour beetles using three different pesticides: Aktara, Indoxacarb and Alfacypermethrin, using the four different concentrations 50, 100, 200, 500 ppm for each mixing ratio (oil: pesticide) in the general rate mortality of the concentrations of oil mixture with pesticides in the adults and larvae of flour beetles. The results of the statistical analysis showed a clear significant difference between the general averages of the mortality ratios of the four concentrations. The results also indicated the values of propensity, LC50, and the total activation ratios of the mixtures of Milk thistle oils and Sob with the pesticides Aktara, Indoxacarb, and Alfacypermethrin. A variation in the LC50 values for the mixtures of oils with pesticides was noticed, but there is an increase in the toxicity of the mixture of oil and Indoxacarb pesticide compared with the mixtures of oil, Aktara pesticide and alfacypermethrin. The LC50 values for mixtures of Milk thistle and Carthamus tinctorius oils with Indoxacarb pesticide reached 34.5 and 17.9 ppm on caterpillars and 46.4 and 23.5 ppm on adults, while it reached 46.4 and 23.5 ppm for mixtures The oils themselves with the Aktara pesticide were 858.5 and 715.3 ppm on caterpillars and 190.3 and 538.7 ppm on adults. As for the mixtures of oils with Alfacypermethrin, they were 3194.4 and 248.5 ppm on caterpillars and 307.8 and 1410.5 ppm on adults.

The Catalytic Upgrading Performance of NiSO4 and FeSO4 in the Case of Ashal’cha Heavy Oil Reservoir

Aquathermolysis is a promising process for improving the quality of heavy oil under reservoir conditions. However, the application of catalysts during the process can significantly promote the transformation of the heavy fragments and heteroatom-containing compounds of crude oil mixtures into low-molecular-weight hydrocarbons. This research paper conducted a comparative analysis of the catalytic effectiveness of water-soluble metal salts like NiSO4 and FeSO4 in the process of aquathermolysis to upgrade heavy oil samples extracted from the Ashal’cha reservoir. The temperature of the experiment was 300 °C for a duration of 24 h. Compared to the viscosity of the native crude oil, the Fe nanoparticles contributed to a 60% reduction in viscosity. The viscosity alteration is explained by the chemical changes observed in the composition of heavy oil after catalytic (FeSO4) aquathermolysis, where the asphaltene and resin contents were altered by 7% and 17%, accordingly. Moreover, the observed aquathermolytic upgrading of heavy oil in the presence of FeSO4 led to an increase in the yield of gasoline fraction by 13% and diesel fraction by 53%. The H/C ratio, which represents the hydrogenation of crude oil, increased from 1.52 (before catalytic upgrading) to 1.99 (after catalytic upgrading). The results of Chromatomass (GC MS) and Fourier-transform infrared spectroscopy (FT-IR) show the intensification of destructive hydrogenation reactions in the presence of water-soluble catalysts. According to the XRD and SEM-EDX results, the metal salts are thermally decomposed during the aquathermolysis process into the oxides of corresponding metals and are particularly sulfided by the sulfur-containing aquathermolysis products.

Efficacy of different lures for Phloeosinus aubei and other native and exotic bark and ambrosia beetles

AbstractPhloeosinus aubei is invasive in Central Europe, spreading northward from the Mediterranean region because of climate change. P. aubei has the potential to become a pest of mature, naturally occurring juniper trees (Juniperus communis) in protected areas, as well as junipers, thujas and cypresses in nurseries and urban environments. In 2020 and 2021, we conducted two experiments to compare various lures for trapping P. aubei. In the first experiment, we compared four lures: α‐pinene; turpentine; a mixture of cade oil, juniper berry oil and ethanol; and a juniper branch (8–10 cm long, 3–5 cm wide) deployed with ethanol. In the second experiment, we compared Hostowit® with a juniper branch (8–10 cm long, 3–5 cm wide) deployed with ethanol. In both experiments, juniper branches deployed with ethanol attracted a greater number of P. aubei beetles compared to the other lures. In total, we captured 1056 individuals belonging to 36 species of Scolytinae. Among the most abundant species, Xyleborinus saxesenii, Xyleborus monographus and Anisandrus dispar were lured by ethanol in combination with other substances or deployed with juniper branches. Xyleborus dryographus showed a positive association with turpentine. Ips typographus was positively associated with α‐pinene, while Orthotomicus laricis, Hylastes attenuatus and Gnathotrichus materiarius were positively associated with Hostowit® lure.

A Mixture of Essential Oils from Three Cretan Aromatic Plants Inhibits SARS-CoV-2 Proliferation: A Proof-of-Concept Intervention Study in Ambulatory Patients.

The need for effective therapeutic regimens for non-critically ill patients during the COVID-19 pandemic remained largely unmet. Previous work has shown that a combination of three aromatic plants' essential oils (CAPeo) (Thymbra capitata (L.) Cav., Origanum dictamnus L., Salvia fruticose Mill.) has remarkable in vitro antiviral activity. Given its properties, it was urgent to explore its potential in treating mild COVID-19 patients in primary care settings. A total of 69 adult patients were included in a clinical proof-of-concept (PoC) intervention study. Family physicians implemented the observational study in two arms (intervention group and control group) during three study periods (IG2020, n=13, IG2021/22, n=25, and CG2021/22, n=31). The SARS-CoV-2 infection was confirmed by real-time PCR. The CAPeo mixture was administered daily for 14 days per os in the intervention group, while the control group received usual care. The PoC study found that the number and frequency of general symptoms, including general fatigue, weakness, fever, and myalgia, decreased following CAPeo administration. By Day 7, the average presence (number) of symptoms decreased in comparison with Day 1 in IG (4.7 to 1.4) as well as in CG (4.0 to 3.1), representing a significant decrease in the cumulative presence in IC (-3.3 vs. -0.9, p < 0.001; η2 = 0.20) on Day 7 and on Day 14 (-4.2 vs. -2.9, p = 0.027; η2 = 0.08). Our findings suggest that CAPeo possesses potent antiviral activity against SARS-CoV-2 in addition tο its effect against influenza A and B and human rhinovirus HRV14 strains. The early and effective impact on alleviating key symptoms of COVID-19 may suggest this mixture can act as a complementary natural agent for patients with mild COVID-19.

Tailoring NiMo-Based Catalysts for Production of Low-Viscosity Sustainable Hydrocarbon Bases for Drilling Muds from Secondary Gas Oils

This article presents the prospect of using the process of deep hydrodesulfurization and hydrodearomatization of secondary gas oils using highly active NiMo catalysts to obtain hydrocarbon bases for drilling fluids. Catalysts were synthesized using PMo heteropolyanions, citric acid, and diethylene glycol on alumina carriers with different pore volumes. This study showed that the concentration of the impregnating solution affects the composition and morphology of the active phase particles of the prepared catalyst, while the textural characteristics of the carrier influence the physicochemical properties and catalytic activity of the NiMo/Al2O3 catalysts. The catalyst that was synthesized using a carrier with the largest pore volume and an effective diameter of more than 7 nm exhibited the highest activity. It was demonstrated that the use of such a catalyst allows for the procurement of hydrocarbon bases for drilling fluids from mixtures of secondary gas oils at a hydrogen pressure of 15–20 MPa. This study has practical significance for the development of sustainable and economically efficient methods for the utilization of low-quality petroleum gas oils to produce high-margin environmentally friendly non-fuel petroleum products, as well as contributes to the development of economically efficient technologies for the utilization of petroleum raw materials.

Evaluation of the impact of supplying a marine diesel engine with a mixture of diesel oil and n-butanol on its efficiency and emission of toxic compounds

The article presents the results of research on the impact of feeding marine reciprocating internal combustion engines with blends of diesel fuel and n-butanol on their performance parameters. The study includes a research plan and empirical results, in which the engine efficiency and emissions of harmful compounds in the exhaust gases were determined. The research indicates that it is resonable to use fuel blends containing n-butanol. N-butanol positively affect the concentration of NOx has positive impact on reducing the toxicity of exhaust gases. An important aspect of the passive defence of a vessel is the reduction of exhaust gas temperature under nominal loads.

Experimental investigations of enhanced oil recovery using porous SiO2 aerogel nanosuspensions with emulsifying effects

To address problematic low reservoir recovery rates, a new porous SiO2 aerogel nanosuspension (NS) with emulsifying effects was developed, and its microstructure and flow characteristics were analysed with physical property and rheological tests. Moreover, macro- and microlevel flooding experiments were carried out to explore the mechanism for enhanced oil recovery (EOR). The results showed that the final recovery rates were 58.23% and 60.68% with 0.8 PV NS and NS foam slug, respectively, which were 10.03% and 13.62% higher than those of secondary oil recovery. Oil-water emulsions with different emulsification degrees were generated after sufficiently oscillating the NS and condensate oil mixture. NS flooding exhibited evident nonpiston characteristics in the early stage, and particles were transferred from water into the oil phase, which resulted in differential emulsification of the oil. The oil flow status was altered from flakes to droplets due to emulsification and the changing passage cross-section caused by particle accumulation. With NS foam flooding, the oil was first replaced by coherent large bubbles and then migrated under the effects of multiple systems. A particle circumfluence layer around the foam absorbed oil to generate an adhesive oil film.

Multi-objective optimization and 4E's analysis of a VCR diesel engine fueled with binary fuel mixtures of diesel and pyrolysis oil derived from different plastics waste

In the present work, the best-worst multi-criteria decision-making (MCDM) method is used to choose PP and HDPE from five waste plastic pyrolytic oils (PP, PS, HDPE, PMMA, and LDPE). For variable compression direct injection diesel engine testing, the best two fuel mixes (PP/HDPE) in varying amounts with diesel are used. Engine load (20%, 40%, 60%, 80%, and 100%), compression ratio (16, 17, 18), and fuel blend (10%, 20%, 30%, and 40%) are tested during engine testing. The energy, exergy, emission, and economic (4Es) analysis determined the best test fuel for engine performance and emissions. Response Surface Methodology (RSM) optimized engine performance and emission. Finally, desirability function and sensitivity analysis showed that the test fuel mixture 20WPO (20%WPO+80%diesel) made from polypropylene-based waste plastics had the best performance and emission output at a compression ratio of 18 and 100% engine load.

Experimental analysis of a diesel engine run on non-conventional fuel blend at different preheating temperatures

Due to urbanisation, the reuse of scrap tyres in the form of energy has gained attention for the disposal of waste tyres. Among the numerous methods, pyrolysis appears to be possible, appealing and viable for generating products such as pyrolysis oil, which can be combined with petroleum oils and used as a source of energy. In a prior study, a mixture of jatropha methyl ester (JME) and tyre pyrolysis oil (TPO) was used as a diesel engine fuel, and it was discovered that the JMETPO20 (JME80% + TPO20%) blend gave better results among all the test blends but inferior than diesel operation. Also, it was reported that due to higher viscosity of the JMETPO20 blend, engine gave inferior performance than diesel operated engine. In this context, an attempt has been made to utilize the JMETPO20 blend at different preheating temperatures to substitute conventional diesel. The blend was preheated at three different temperatures, that is, 50, 60 and 70°C and experiments were carried out in a single-cylinder diesel engine with a rated output of 4.4 kW. The results of the investigations were analysed and compared with diesel and presented in this study.