挥发性有机物回收模拟计算

Simulation and calculation of volatile organic compounds recovery

针对低密度聚乙烯催化剂制备过程中会产生多组分有机尾气的问题,采用常压膜分离工艺,利用PRO/Ⅱ模拟软件对异戊烷、戊烷、四氢呋喃等有机溶剂进行了回收模拟计算。考察了冷凝温度、分离膜面积、溶剂渗透系数及分离膜渗透侧压力等工艺参数的影响。研究结果表明:冷凝温度不是决定溶剂净化度的主要指标,分离膜面积、溶剂在分离膜中的渗透系数、分离膜渗透侧压力均可显著影响净化气中VOCs的含量。对于一定的分离体系和分离净化目标,存在最优的膜面积和最低渗透系数要求。膜分离技术作为一种新兴的气体分离技术,未来可以较好地应用于高附加值有机物的回收领域。

In order to solve the problem of multi-component organic tail gas in the preparation of LDPE catalyst, the process of atmospheric membrane separation condensation adsorption is adopted, and the recovery of isopentane, pentane, tetrahydrofuran and other organic solvents is simulated by PRO/Ⅱ simulation software. The effects of condensation temperature, membrane area, solvent permeability coefficient and osmotic pressure are investigated. The results show that the condensation temperature is not the main index to determine the purification degree. The separation membrane area, the permeability coefficient and the osmotic pressure can significantly affect the VOCs content in the purified gas. For a certain separation system and purification target, there are optimal membrane area and minimum permeability coefficient requirements. As a new gas separation technology, membrane separation technology can be applied to the recovery of high value-added organics in the future.