Abstract
Primary and secondary alcohols, obtained as a product of processing of plant raw materials, can be used as additives in fuel. Mixtures of n-alkanes, cyclic alkanes and aromatic hydrocarbons can act as a model for gasoline and diesel fuel. Therefore, it is necessary to study the characteristics of mixtures of alcohols with normal, cyclic and aromatic hydrocarbons. To simulate liquid-solid and liquid-vapor phase equilibria, a method is used to minimize excess Gibbs energy by the solvation parameter. The authors developed the PCEAS (Phase Charts Eutectic and Azeotropic Systems) software. The input data in the case of constant pressure are the temperature T 0 and the enthalpy of the phase change H 0 of the pure components. Prediction of the thermodynamic parameters of secondary alcohols is used to calculate the eutectic and azeotropic parameters of the secondary alcohol - n-alkane mixture: composition, temperature, melting enthalpy and evaporation. The model makes it possible to determine the average value of the association parameter in the liquid phase k . Experimental data for azeotropic mixtures made it possible to establish the association parameter in the vaporphase of the systems under study. The results of calculations can be used to select the optimal composition and obtain the requiredcharacteristics of biofuel.
Highlights
The study and promotion of new types of biofuels, which use renewable energy sources obtained during the processing of plant raw materials, will contribute to improving the environmental situation and make it possible to reduce the cost of fuel production
In this paper we study the liquid-solid and liquidvapor phase equilibrium in the secondary alcohol – nalkane system at constant pressure
We present the results of the calculation of liquid-solid and liquid-vapor phase diagrams in secondary alcohol – n-alkane systems and water-secondary alcohol using the PCEAS model
Summary
The study and promotion of new types of biofuels, which use renewable energy sources obtained during the processing of plant raw materials, will contribute to improving the environmental situation and make it possible to reduce the cost of fuel production. Primary and secondary alcohols can be used as additives in fuel, constituting up to 10% of gasoline and diesel fuel. The properties of these new types of biofuels vary compared to traditional fossil fuels. Mixtures of n-alkanes, cyclic alkanes and aromatic hydrocarbons can act as a model for gasoline and diesel fuel. It is necessary to study the characteristics of mixtures of alcohols with normal, cyclic and aromatic hydrocarbons.
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