含碳酸甲乙酯多元体系液液相平衡的测定及其热力学模型的关联
发布时间：2018-12-06 09:33
【摘要】：近年来,随着人们环境保护意识的提高,科研工作者开始研究新型环保汽油添加剂以提高辛烷值、改善燃油品质、降低油耗,从而达到节能减排的目的。碳酸甲乙酯(EMC)是一种环境友好的碳酸酯,由于它的高含氧量、高辛烷值以及在水中的低溶解性,因此,EMC可以作为一种潜在的汽油添加剂。本论文使用气相色谱仪对EMC、醇、水、烷烃四种物质所组成的多元体系进行了液液相平衡的测定,并且根据实验所测得的液液相平衡数据,考察EMC是否具有作为汽油添加剂使用的潜力。本实验在常温常压下测定了三元和四元体系液液相平衡数据,三元体系为:(水+甲醇+EMC)、(水+乙醇+EMC)、(水+乙醇+辛烷)、(水+EMC+庚烷)、(水+EMC+辛烷);四元体系为:(水+EMC+甲醇+庚烷)、(水+EMC+乙醇+庚烷)、(水+EMC+甲醇+辛烷)、(水+EMC+乙醇+辛烷),计算了四元体系中各物质组分的分配系数。本论文用Modified UNIQUAC和Extended UNIQUAC模型对实验测得的液液相平衡数据进行了关联计算,对于三元体系,Modified UNIQUAC和Extended UNIQUAC模型计算得到关联结果的平均均方根差分别为0.59 mol%,1.16 mol%;对于四元体系则分别为1.27mol%,1.86 mol%。计算结果表明:由模型计算得到的关联值与实验值吻合度很高。同时,使用Othmer-Tobias方程验证了实验测得的液液相平衡数据的准确度。三元和四元体系Othmer-Tobias方程的相关系数(R2)值均接近1,表明实验测得的液液相平衡数据具有较高的精确度。
[Abstract]:In recent years, with the improvement of people's awareness of environmental protection, researchers began to study new environmental protection gasoline additives to improve the octane number, improve fuel quality, reduce fuel consumption, so as to achieve the purpose of energy saving and emission reduction. Methyl ethyl carbonate (EMC) is an environmentally friendly carbonate. Because of its high oxygen content, high octane number and low solubility in water, EMC can be used as a potential gasoline additive. In this paper, the liquid-liquid equilibrium of the multicomponent system composed of EMC, alcohol, water and alkane was determined by gas chromatograph, and the liquid-liquid equilibrium data were obtained according to the experimental data. To investigate the potential of EMC as gasoline additive. The liquid-liquid equilibrium data of ternary and quaternary systems were measured at room temperature and atmospheric pressure. The ternary systems were as follows: (water methanol, EMC), (, water, ethanol, EMC), (, ethanol, octane,), (, EMC, heptane,), (, EMC, octane); The quaternary system consists of: (water EMC methanol heptane), (water EMC alcohol heptane), (water EMC methanol octane), (water EMC ethanol octane). The partition coefficients of each component in the quaternion system have been calculated. In this paper, Modified UNIQUAC and Extended UNIQUAC models are used to calculate the liquid-liquid equilibrium data measured in experiments. For the, Modified UNIQUAC and Extended UNIQUAC models of ternary systems, the average root mean square difference of the correlation results is 0.59 mol%,1.16 mol%;, respectively. For the quaternion system, 1.27 moland 1.86 mol%., respectively. The results show that the correlation values calculated by the model are in good agreement with the experimental values. At the same time, the Othmer-Tobias equation is used to verify the accuracy of the measured liquid-liquid equilibrium data. The correlation coefficient (R2) of the Othmer-Tobias equation of ternary and quaternion systems is close to 1, which indicates that the experimental data of liquid-liquid equilibrium have high accuracy.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O642.42;TE624.81
本文编号：2365828
[Abstract]:In recent years, with the improvement of people's awareness of environmental protection, researchers began to study new environmental protection gasoline additives to improve the octane number, improve fuel quality, reduce fuel consumption, so as to achieve the purpose of energy saving and emission reduction. Methyl ethyl carbonate (EMC) is an environmentally friendly carbonate. Because of its high oxygen content, high octane number and low solubility in water, EMC can be used as a potential gasoline additive. In this paper, the liquid-liquid equilibrium of the multicomponent system composed of EMC, alcohol, water and alkane was determined by gas chromatograph, and the liquid-liquid equilibrium data were obtained according to the experimental data. To investigate the potential of EMC as gasoline additive. The liquid-liquid equilibrium data of ternary and quaternary systems were measured at room temperature and atmospheric pressure. The ternary systems were as follows: (water methanol, EMC), (, water, ethanol, EMC), (, ethanol, octane,), (, EMC, heptane,), (, EMC, octane); The quaternary system consists of: (water EMC methanol heptane), (water EMC alcohol heptane), (water EMC methanol octane), (water EMC ethanol octane). The partition coefficients of each component in the quaternion system have been calculated. In this paper, Modified UNIQUAC and Extended UNIQUAC models are used to calculate the liquid-liquid equilibrium data measured in experiments. For the, Modified UNIQUAC and Extended UNIQUAC models of ternary systems, the average root mean square difference of the correlation results is 0.59 mol%,1.16 mol%;, respectively. For the quaternion system, 1.27 moland 1.86 mol%., respectively. The results show that the correlation values calculated by the model are in good agreement with the experimental values. At the same time, the Othmer-Tobias equation is used to verify the accuracy of the measured liquid-liquid equilibrium data. The correlation coefficient (R2) of the Othmer-Tobias equation of ternary and quaternion systems is close to 1, which indicates that the experimental data of liquid-liquid equilibrium have high accuracy.
【学位授予单位】：暨南大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：O642.42;TE624.81
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