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化工学报  2015 

萃取精馏分离苯/环己烷共沸体系的控制策略

DOI: 10.11949/j.issn.0438-1157.20150782, PP. 3618-3632

Keywords: 萃取精馏,差压热耦合,隔壁塔,共沸物,控制

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Abstract:

将常规萃取精馏、差压热耦合萃取精馏以及隔壁塔萃取精馏技术应用于以糠醛为萃取剂的苯和环己烷共沸物分离过程。在稳态模型的基础上,利用AspenDynamics软件进行控制研究,对三工艺流程提出了若干控制策略。结果表明,对于常规萃取精馏过程,再沸器热负荷与进料量比值控制结构在降低控制过程超调量方面表现出明显优势;对于差压热耦合萃取精馏过程,带有压力-补偿控温策略的方案控制效果更佳;而对于隔壁塔,则选择了无隔板下方气液分离比控制的结构来作为较优的控制策略。

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