Thermodynamic properties of fatty acid   esters in some biodiesel fuels

Левтеров, А. М.; St., Kharkiv Pozharsky

doi:10.15407/fm25.02.308

Cited by 12 publications

(10 citation statements)

References 8 publications

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“…The thermodynamic properties of fatty acid esters as fuel components are presented in [8]. The thermophysical properties of biodiesel fuel in the high-temperature gas phase have been studied for thermodynamic calculations of piston engine operating processes.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Rational conditions of fatty acids obtaining by soapstock treatment with sulfuric acid

Sytnik

Kunitsіa

Mazaeva

et al. 2021

EEJET

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As a result of alkaline neutralization of oils, a significant amount of soapstock is formed, the utilization of which creates an environmental and economic problem. The production of fatty acids from soapstock using sulfuric acid decomposition is investigated in this work. The peculiarity of the work is the determination of regression dependences of the yield and neutralization number of fatty acids on the soapstock processing conditions: temperature and duration. Soapstock obtained after neutralization of sunflower oil was used as raw material. Soapstock indicators: mass fraction of moisture – 15.4 %, total fat – 71.9 %, fatty acids – 64.5 %, neutral fat – 7.4 %. Rational conditions of soapstock processing are determined: temperature (90–95) °С, duration 40 min. Under these conditions, the fatty acid yield is 79.0 %, the neutralization number is 180.0 mg KOH/g. Quality indicators of the obtained fatty acids: mass fraction of moisture and volatile substances – 1.8 %, mass fraction of total fat – 97.0 %, cleavage depth – 64.5 % of oleic acid, the presence of mineral acids – no. Fatty acids correspond to fatty acids of the first grade according to DSTU 4860 (CAS 61788-66-7). An increase in the temperature and duration of soapstock contact with sulfuric acid increases the yield and neutralization number of fatty acids. This is due to a decrease in the viscosity of the reaction medium, an increase in the depth of cleavage of soapstock soaps with sulfuric acid, an increase in the intensity and duration of mass transfer. The developed rational conditions allow obtaining fatty acids from soapstock, which correspond in composition to fatty acids from refined deodorized sunflower oil. The results allow solving a number of economic and environmental problems associated with soapstock utilization and can be implemented in oil refineries and fatty acid production

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

Rational conditions of fatty acids obtaining by soapstock treatment with sulfuric acid

Sytnik

Kunitsіa

Mazaeva

et al. 2021

EEJET

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“…At first, the robustness of the mathematical algorithm underlying relevant regulations was investigated [9]. The study of deficiencies in the quality of a regulatory document related to inaccuracies in the original data was reported in paper [10]. Another study contained an inaccuracy in the numerical value of the participation rate of combustible gases and fumes in burning [11].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Construction of an algorithm for building regions of questionable decisions for devices containing gases in a linear multidimensional space of hazardous factors

Teslenko

Chernukha

Bezuglov

et al. 2019

EEJET

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“…Global trends in the development of vehicles force improvements to the infrastructure of power supply to settlements, together with preserving the ecology [13] based on the use alternative energy sources [14]. Many properties of a car depend on the type and properties of the fuel [15]. Products of the fuel combustion have a negative impact on humans and the environment [16].…”

Section: Introductionmentioning

confidence: 99%

Development of a Method for Evaluating the Technical Condition of a Car’s Hybrid Powertrain

et al. 2021

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The article presents the results of a study performed and substantiated based on the principles of a new method of diagnostics of technical conditions of a hybrid powertrain regardless of the structural diagram and design features of a hybrid vehicle. The presented new technology of the diagnostics of hybrid powertrains allows an objective complex assessment of their technical condition by diagnostic parameters in contrast to existing diagnostic methods. In the proposed method, a mechanism for the general standardization of diagnostic parameters has been developed as well as for determining the numerical values of the parameters of the powertrain. The control subset was used to control the learning error. As a result of debugging the system, the scatter of experimental and calculated points has decreased, which confirms the quality of debugging the tested fuzzy model. As a result of training the artificial neural network, the standard deviation of the error in the control sample was 0.012·Pk. A symmetry method of diagnostics of the technical state of a hybrid propulsion system was developed based on the concept of a neural network together with a neuro-fuzzy control with an adaptive criteria based on the method of training a neural network with reinforcement. The components of the vector functional include the criteria for control accuracy, the use of traction battery energy, and the degree of toxicity of exhaust gases. It is proposed to use the principle of symmetry of the guaranteed result and the linear inversion of the vector criterion into a supercriterion to determine the technical state of a hybrid powertrain on a set of Pareto-optimal controls under unequal conditions of optimality.

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Thermodynamic properties of fatty acid esters in some biodiesel fuels

Cited by 12 publications

References 8 publications

Rational conditions of fatty acids obtaining by soapstock treatment with sulfuric acid

Rational conditions of fatty acids obtaining by soapstock treatment with sulfuric acid

Construction of an algorithm for building regions of questionable decisions for devices containing gases in a linear multidimensional space of hazardous factors

Development of a Method for Evaluating the Technical Condition of a Car’s Hybrid Powertrain

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