PVA厂乙酸甲酯水解回收系统全流程模拟

The whole flow simulation of methyl acetate hydrolysis system in PVA plant

本文应用HYSYS等流程模拟软件模拟PVA厂乙酸甲酯（MeOAC）水解回收工序的全流程，分别模拟比较传统的固定床水解工艺、工业化的催化精馏水解工艺和本项目研究的萃取精馏与催化精馏耦合水解工艺。综合工艺流程的模拟，为了降低能耗，提出耦合水解工艺的中试方案：控制回流进料比约为3，进料水酯摩尔大于5，水解转化率大于90％mol，配合电渗析或连续萃取操作提浓乙酸，可望比原固定床工艺节能2成。通过中试反馈和进一步仿真，优化MeOAC水解耦合工艺流程体系，提出实现“深度水解”和“完全水解”的耦合水解工艺新方案，核算过程。结果表明耦合水解工艺方案可行，节能效果十分显著。

The HYSYS emluator was applied to the flow sheeting simulations of hydrolyzing methyl acetate （MeOAC） in PVA plants, including traditional Fixed-bed Technology, Catalytic Distillation Technology and the much referred Coupling Technology of extractive distillation and catalytic distillation （ Coupling Tech. ）. With process analysis of the flow sheeting simulations, the suitable conditions for pilotseale experiment were put forward based upon the principle of energy saving. That is, the volume ratio of reflux to feed （L/F） is about 3, the mole ratio of water to MeOAC （H2O/MeOAC） is above 5, the conversion of MeOAC （ Cony. ） is larger than 90% mol, so that the energy consumption can be reduced to less than the fixed-bed technology by about 20% with concentrating the acetic acid （HAe） by distillation together with electrodialysis or extraction operation. What is more, the Coupling Tech. process operations were optimized through the feedback from pilot experiments and further simulation researches. Two new technology schemes of the Coupling Teeh. were contrived and simulated, which were ＂deep level hydrolysis＂ and ＂complete hydrolysis＂. The results show that the Coupling Tech. was applicable, and that remarkable energy conservation could be achieved.