“背包式”反应精馏水解乙酸甲酯的工艺

Catalytic distillation coupled with a side reactor for methyl acetate hydrolysis

采用"背包式"反应精馏深度水解乙酸甲酯,考察了工艺条件对水解率和酸水比的影响,并与传统的单塔催化精馏工艺进行了对比。结果表明:提高水酯比可以显著提高乙酸甲酯的水解率;回流进料比的增加有利于提高水解率但会增加能耗,较佳回流比为3.0左右;乙酸甲酯水解率随空速的增加而降低的速度较慢,可以适当提高空速以增加处理能力;增加固定床体积有利于酯的预水解,但是不一定有利于酯的总转化率。采用"背包式"催化精馏工艺可以实现乙酸甲酯的深度水解,且优于传统的单塔催化精馏工艺。

An experimental setup of catalytic distillation coupled with a side reactor was established to hydrolyze methyl acetate with high conversion rate.The influences of operating parameters on the conversion rate and the mass ratio of acetic acid to water were investigated.This new technology was also compared with traditional single column catalytic distillation.The results showed that the molar ratio of water to methyl acetate had a great impact on the conversion rate of methyl acetate.With the increase of the volume ratio of reflux to methyl acetate feed the conversion rate of methyl acetate slowly increased and energy consumption linearly increased,and the optimum volume ratio of reflux to methyl acetate feed was 3.0.Due to a slow decrease of conversion rate of methyl acetate with the increase of space velocity,a higher space velocity would be favorable in increasing processing capacity.A bigger fixed reactor can improve the conversion rate of methyl acetate at the outlet of the reactor but is not necessarily conducive to higher total conversion rate.This new technology can realize the hydrolysis of methyl acetate with high conversion rate and is better than traditional single column catalytic distillation.