摘要
基于Aspen Plus模拟软件,选用UNIFAC物性方法对变压精馏分离C_4与甲醇共沸物过程进行模拟与优化。考察了理论板数、回流比及进料位置对产品质量分数和能耗的影响。确定了较佳工艺条件:加压塔理论板数为30,回流比为1.2,原料进料位置分别为第15块塔板,塔釜C_4质量分数为99.99%;低压塔理论板数为20,回流比为1.2,进料位置为第9块塔板,塔釜甲醇质量分数为99.99%。与传统萃取精馏相比,变压精馏能耗稍高,但无需引入其他组分。
Pressure-swing distillation with full heat integration for separation of C4 fraction and methanol is investigated. The simulation is performed by Aspen Plus using the NRTL equation. The influences of stage numbers, reflux ratio and feed stage on the product yield and energy consumption are studied. For high pressure column, the mass fraction of formic acid can reach 99.99% at the bottom of column under the following conditions ：30 of theoretical plate number, 1.16 of reflux ratio, 15 of feed stream location, respectively. For low pressure column, the mass fraction of the water at the bottom of column is 99. 99% when theoretical plate number, reflux ratio and feed location are 20,1.24 and 9, respectively. Compared with extraction distillation, pressure-swing distillation has slight higher energy consumption but without introducing other components.
出处
《现代化工》
CAS
CSCD
北大核心
2015年第12期147-150,共4页
Modern Chemical Industry
