含硫化合物二元体系汽液相平衡研究

发布时间：2018-05-13 20:26

本文选题：2-甲基噻吩 + 2　；参考：《太原理工大学》2017年硕士论文

【摘要】：在煤化工领域,我国精炼焦化粗苯是生产苯、甲苯、二甲苯的一个主要途径。在焦化粗苯精制过程中含硫化合物的脱除一直是一个技术难题,尤其是噻吩类硫化物的脱除。在石油化工领域,我国车用汽油的生产技术主要依靠催化裂化技术,汽油中的硫含量明显高于发达国家。随着我国对化工产品中含硫化合物含量的要求越来越严格,需要对化工产品的含硫化合物进行深度脱除,而汽液相平衡数据是设计分离设备和混合物分离的重要依据。由于文献中发表的关于噻吩类体系的汽液相平衡数据较少,本研究选取2-甲基噻吩和2,5-二甲基噻吩两种含硫化合物为研究对象。本研究通过建立减压汽液平衡系统,测定了两种含硫化合物2-甲基噻吩、2,5-二甲基噻吩分别与烷烃(2,2,4-三甲基戊烷、正庚烷、正壬烷、正癸烷)、烯烃(2,3-二甲基-1-丁烯、2,3-二甲基-2-丁烯、1-辛烯、环己烯)和环烷烃(甲基环戊烷、环己烷、甲基环己烷、乙基环己烷)共二十三组二元体系在90.00KPa下的汽液平衡数据,所有二元体系都通过了热力学一致性检验。实验数据分别用Wilson、NRTL、UNIQUAC三种活度系数模型对数据进行关联,得到了二元体系的交互作用参数。为了能够用实验体系推算未发表的体系,本文采用UNIFAC-Dortmund和UNIFAC-Original基团贡献法对所有组分进行基团拆分,拟合得到多组基团间的交互作用参数。还利用这两种模型对实验数据进行拟合,将得到的拟合数据与实验数据进行了分析。通过分析实验数据发现,在2,2,4-三甲基戊烷+2-甲基噻吩和乙基环己烷+2,5-二甲基噻吩这两个体系存在共沸,其中后者为正偏差溶液,存在最低恒沸点。
[Abstract]:In the field of coal chemical industry, refining coking crude benzene in China is a major way to produce benzene, toluene and xylene. In the process of refining coking crude benzol, the removal of sulfur compounds is a technical problem, especially the removal of thiophene sulfide. In the field of petrochemical industry, the production technology of vehicle gasoline in our country mainly depends on the technology of catalytic cracking. Sulfur content in gasoline is obviously higher than that of developed countries. With the increasingly stringent requirements for the content of sulfur compounds in chemical products, the sulfur compounds in chemical products need to be removed in depth. The vapor liquid equilibrium data is the important basis for the separation of design separation equipment and mixtures. 2- methyl thiophene and 2,5- two methyl thiophene compounds were selected as the research objects. In this study, two kinds of sulfur compounds, 2- methyl thiophene, 2,5- two methyl thiophene and alkanes (2,2,4- three methyl pentane, n-heptane, n-nonane, n-decane, and decane) were determined by the establishment of a vacuum vapor liquid equilibrium system. Alkenes (2,3- two methyl -1- butene, 2,3- two methyl -2- butene, 1- octene, cyclohexene) and naphthene (methyl cyclopentane, cyclohexane, methyl cyclohexane, ethyl cyclohexane) in a total of twenty-three groups of two system of vapor liquid equilibrium data under 90.00KPa, all two systems have passed the thermodynamic consistency test. Experimental data are used Wilson, NRTL, respectively, UNIQUAC three activity coefficient models are related to the data, and the interaction parameters of the two element system are obtained. In order to be able to calculate the unpublished system by the experimental system, this paper uses the UNIFAC-Dortmund and UNIFAC-Original group contribution method to divide all the components into the group, and gets the interaction parameters between the groups. These two models are used to fit the experimental data, and the obtained data are analyzed with the experimental data. Through the analysis of the experimental data, it is found that the two systems of 2,2,4- three methyl pentane methyl thiophene and ethyl cyclohexane +2,5- two methyl thiophene are azeotrope, the latter is a positive deviation solution, and the lowest azeotrope exists.

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ013.1

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