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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。
Based on Aspen Plus simulation software, UNIFAC physical property was used to simulate and optimize the separation of C_4 and methanol azeotrope by pressure swing distillation. The effect of theoretical plate number, reflux ratio and feed position on product mass fraction and energy consumption was investigated. The optimum process conditions were as follows: the theoretical plate number of the pressure tower was 30, the reflux ratio was 1.2, the feed position of the raw material was the 15th plate, the mass fraction of C_4 was 99.99%, the theoretical plate number of the low pressure column was 20, The reflux ratio was 1.2, the feed position was the 9th plate, and the column bottoms methanol mass fraction was 99.99%. Compared with the traditional extractive distillation, pressure distillation slightly higher energy consumption, but without the introduction of other components.