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研究采用动态法测定常压下费托蜡在正丁醇、乙酸丁酯、正辛烷、石油醚和甲苯溶剂体系中的溶解度。结果表明,费托蜡在5种有机溶剂中的溶解度均随温度升高而增大,且在不同溶剂中费托蜡的溶解度存在较大差异。采用Apelblat方程、多项式方程以及简化的二参数方程关联溶解度数据,关联结果良好,但Apelblat方程、多项式方程的拟合效果优于简化的二参数方程。此外,通过修正的Van’t Hoff方程计算,得到费托蜡在5种有机溶剂中的溶解焓ΔsolH、溶解熵ΔsolS和溶解吉布斯自由能ΔsolG,结果表明费托蜡在5种有机溶剂中的溶解过程均为吸热、熵增的非自发过程。所得结果能够为费托蜡结晶工艺的开发提供重要的理论依据。
Abstract：Solubilities of Fischer-Tropsch wax in organic solvents (n-butanol,butyl acetate,n-octane,petroleum ether and toluene) under atmospheric pressure were measured by a dynamic method.The results show that the solubilities of Fischer-Tropsch wax in the five organic solvents increase with temperature,and are of great difference in different solvents.The solubility data were well correlated by Apelblat equation,polynomial equation and simplified two-parameter equation,and better correlated by Apelblat equation and polynomial equation than by simplified two-parameter equation.In addition,the values of the dissolution enthalpy ΔsolH,dissolution entropy ΔsolS and dissolution Gibbs free energyΔsolG of Fischer-Tropsch wax in the five organic solvents were calculated by modified Van’t Hoff equation.The obtained values of these thermodynamic parameters show that the dissolution processes of Fischer-Tropsch wax in the five organic solvents are endothermic,entropic and non-spontaneous.The results obtained can provide an important theoretical basis for the development of Fischer-Tropsch wax crystallization processes.
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基本信息:
中图分类号:TQ645.93
引用信息:
[1]谢浩东,徐可凡,于亚楠,等.费托蜡在五种有机溶剂中的溶解度测定及关联[J],2022,36(01):28-35.
基金信息:
国家能源投资集团科技创新项目(ST930019SH10)
2021-05-27
2021
2021-09-15
2021
1