三塔变压精馏分离甲醇—乙腈—苯的过程综合与热集成

发布时间：2018-03-17 02:34

本文选题：甲醇-乙腈-苯　切入点：变压精馏　出处：《青岛科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：常压下,甲醇(M)-乙腈(A)-苯(B)三元混合物中能形成多种共沸物,普通分离方式无法实现该三元共沸体系的高效分离。本文利用三元相图研究了甲醇-乙腈-苯混合物的共沸特性,开发了三塔变压精馏工艺(TCPSD),并分析了其不同精馏序列和热集成技术的经济性,考察了不同热集成三塔变压精馏的动态特性。利用Wilson模型,借助含残余曲线的三元相图,考察了不同精馏序列的三塔变压精馏工艺的可行性。基于传统变压精馏的序贯迭代法,以年度总费用(TAC)最小为最终经济性目标,开发了三塔变压精馏序贯迭代优化程序和三塔变压精馏优化软件TCPSDOS,快速准确的确定了四种不同精馏序列三塔变压精馏最佳工艺参数。A-M-B、A-B-M、M-A-B和M-B-A精馏序列的最小TAC分别为8.239×105$/y、1.138×10~6$/y、1.204×10~6$/y和1.260×10~6$/y,A-M-B精馏序列经济性最优。在A-M-B精馏序列最佳稳态工艺流程基础上,探究了双塔之间和三塔之间部分热量集成和完全热量集成的三塔变压精馏过程经济性。部分热集成中,C1和C2双塔部分热集成技术经济性最优,其最小TAC为6.634×105$/y。完全热集成中,C1和C2双塔完全热集成技术经济性最优,相应的TAC为6.406×105$/y。借助Aspen Plus Dynamics动态模拟软件,考察了三种不同热集成方式的三塔变压精馏动态策略。针对无热集成三塔变压精馏过程,选用靠近进料位置的第19块板作灵敏板的控制结构的稳定时间比远离进料位置的第4块板作灵敏板的控制结构的短;针对C1和C2双塔部分热集成动态控制,温度-组成串级控制结构很好地处理10%进料扰动,但动态变化曲线振荡幅度大;针对C1和C2双塔完全热集成动态控制,采用压力补偿温度控制方式减小了振荡幅度获得了较好的抗扰动能力。
[Abstract]:Under normal pressure, methanol (M) - acetonitrile (A) - benzene (B) mixture of three yuan can form a variety of azeotrope, general separation method can not realize the efficient separation of the three azeotrope system. By using the three element phase diagram study methanol acetonitrile azeotropic mixture of benzene, developed three pressure swing distillation (TCPSD), and analyzes the economy of the different distillation sequence and heat integration technology, the dynamic characteristics of different heat integrated pressure swing distillation tower. By using the Wilson model, with the help of three element phase diagram containing residual curve, investigated the feasibility of three different distillation sequence variable pressure distillation process sequential iterative method. The traditional pressure swing distillation based on the minimum total annual cost (TAC) as the ultimate economic objectives, the development of the three sequential iterative optimization procedure and pressure swing distillation tower pressure swing distillation optimization software TCPSDOS, the rapid and accurate determination of four different distillation sequence three Column pressure swing distillation optimal parameters of.A-M-B, A-B-M, TAC, M-A-B and M-B-A minimum distillation sequences were 8.239 * 105$/y, 1.138 * 10~6$/y, 1.204 * 10~6$/y and 1.260 * 10~6$/y, A-M-B optimal distillation sequence in A-M-B. The best process steady-state distillation sequence on the basis of research between Twin Towers and three part of the heat integrated and fully integrated heat three pressure swing distillation economic integration. Part of the heat, C1 and C2 parts of Twin Towers heat integration technology with optimal economy, the minimum TAC is 6.634 * 105$/y. hot in the integration of C1 and C2, the Twin Towers completely heat integrated optimal technical and economic, the corresponding TAC is 6.406 * 105$/y. by Aspen Plus Dynamics dynamic simulation software, effects of three pressure swing distillation dynamic strategy in three different ways. The integrated thermal heat integrated tower pressure swing distillation process, the nineteenth plates near the inlet position of the spirit Stable time sensitive control structure plate than fourth blocks away from the position of feed control structure sensitive plate short; for C1 and C2 parts of Twin Towers heat integrated dynamic control, temperature and composition of the cascade control structure well with 10% feed disturbance, but the dynamic change curve for C1 and large oscillation amplitude; C2 Twin Towers completely integrated thermal dynamic control, using pressure compensation method to control the temperature to reduce the oscillation amplitude of the anti disturbance ability better.

【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ028.31

【参考文献】