摘 要
苯和环己烷的混合物会形成共沸混合物，因而不能采用普通精馏的方法进行分离，通常采用恒沸精馏和萃取精馏。本论文主要采用萃取精馏的方法进行两者的分离，萃取精馏是向精馏塔顶连续加入高沸点添加剂，改变料液中被分离组分间的相对挥发度，使普通精馏难以分离的液体混合物变得易于分离的一种特殊精馏方法.
对于苯与环己烷的分离，可采用糠醛作为萃取剂，打破苯和环己烷的共沸平衡。一级精馏塔塔釜得到苯与糠醛的共沸物，塔顶得到环己烷，以及极少量苯、糠醛混合物一级精馏塔塔底馏出液进入二级精馏塔，分离苯和糠醛，塔顶得到苯，塔釜为糠醛。
关键词： 萃取精馏；环己烷；萃取剂
ABSTRACT
On the traditional separation of benzene and cyclohexane azeotropic system approach is both azeotropic rectification and extractive distillation, for both research mainly focused on the azeotropic distillation of azeotropic agent selection and extractive distillation in the selection of extraction agent. The extractive distillation is add additive of a high boiling point to the rectification tower top continuous, changes in the material liquid is separated components, the relative volatility between make ordinary distillation to separate liquid mixtures is easy to separate a special distillation method.
Can be used for the separation of benzene and cyclohexane, furfural as extraction agent, breaking the benzene and cyclohexane azeotropic balance. Considering the design of benzene and cyclohexane boiling point in the title, how to adopt the method of extractive distillation, in rectifying tower kettle for level 1 get azeotrope of benzene and furfural, cyclohexane tower, and very little benzene, furfural distillate level of rectification tower bottom into the secondary rectification tower, separation of benzene and furfural, benzene tower, tower kettle for furfural.
Keywords: Extractive distillation; Cyclohexane; Extracting agent
目 录
4.1.2 第二精馏工段物料衡算............................................................................ 12
4.2 能量衡算............. ......................14
4.2.2 衡算表格.....................................................................15
7.2 脱水精馏塔结果表 33
