摘要
基于四氢呋喃/水共沸体系的特性,研究了变压精馏和萃取精馏2种工艺分离四氢呋喃和水的方法,进一步考察了2种工艺的可行性及节能情况。物性计算方法采用NRTL活度系数方程,其二元相互作用参数通过汽液相平衡实验数据回归获得,采用Aspen Plus对上述2种工艺进行模拟及优化,获得了2种工艺较优的工艺参数,并对比能耗。结果表明:采用双塔热集成变压精馏工艺或双塔萃取精馏工艺均可有效地分离四氢呋喃-水二元共沸体系,四氢呋喃产品符合《GB/T 24772—2009工业用四氢呋喃》优等品规格,但热集成变压精馏工艺更为节能,节省循环水11. 0%、节省蒸汽20. 3%,且不引入第三组分,更适合四氢呋喃-水体系的分离,为该共沸体系分离的设计与节能提供依据。
The feasibility and energy saving for the separation of tetrahydrofuran and water were studied by pressure swing distillation and extractive distillation based on the characteristics of the binary azeotropic composition. The above two techniques were simulated and optimized by Aspen Plus using the activity coefficient model NRTL with binary interaction parameters correlated by the experimental data of vapor-liquid equilibrium. The results indicate that the azeotropic mixture of tetrahydrofuran and water can be effectively separated by pressure swing distillation or extractive distillation. Tetrahydrofuran product meets the rank of excellent quality of the standard GB/T 24772-2009,and the heat-integrated pressure swing distillation is more energy saving,which can save 11. 0% of circulating water and 20. 3% of steam. Furthermore,it does not introduce third components and is more suitable for the separation of tetrahydrofuran and water system,which provides the basis for the design and energy saving of the separation of the azeotropic system.
引文
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