A nonequilibrium stage model was used to simulate countercurrent multicomponent catalytic distillation processes for methyl acetate hydrolysis. Computations of stage efficiencies or height equivalent to a theoretical ...A nonequilibrium stage model was used to simulate countercurrent multicomponent catalytic distillation processes for methyl acetate hydrolysis. Computations of stage efficiencies or height equivalent to a theoretical plate (HETP) were entirely avoided by this model. The consistency of simulated results and experimental data in conversions and concentration of each component along a column indicates that the model predicts the actual process well. The influences of operating parameters on hydrolytic conversions, such as feed molar ratios, feed locations, feed and reflux rates, heights of reactive and stripping sections, were analyzed adequately by simulating calculations. A good operating mode was then obtained, which is helpful to the development of a new process.展开更多
以醋酸甲酯合成为模型反应,研究浆料催化精馏过程。对浆料催化精馏过程建立拟均相稳态平衡级模型,用A spen P lus软件进行模拟。考察精馏塔内温度分布、汽液相组成及流率情况,得到醋酸中水含量、反应段塔板数和液相持液量对合成醋酸甲...以醋酸甲酯合成为模型反应,研究浆料催化精馏过程。对浆料催化精馏过程建立拟均相稳态平衡级模型,用A spen P lus软件进行模拟。考察精馏塔内温度分布、汽液相组成及流率情况,得到醋酸中水含量、反应段塔板数和液相持液量对合成醋酸甲酯收率和塔顶醋酸甲酯纯度的影响。计算得出在模拟实验塔内优化操作条件为:23块理论板数,醋酸进料口和甲醇进料口分别位于第7和第17块理论板;酸与醇的摩尔比为1.2∶1.0;催化剂与醋酸的质量比为0.03;回流比1.3;塔板总持液量2 560mL;塔釜持液量1 200mL;控制塔顶采出流率0.485。在此条件下,醋酸甲酸收率大于95%,塔顶产品中酯的质量分数大于96%。展开更多
文摘A nonequilibrium stage model was used to simulate countercurrent multicomponent catalytic distillation processes for methyl acetate hydrolysis. Computations of stage efficiencies or height equivalent to a theoretical plate (HETP) were entirely avoided by this model. The consistency of simulated results and experimental data in conversions and concentration of each component along a column indicates that the model predicts the actual process well. The influences of operating parameters on hydrolytic conversions, such as feed molar ratios, feed locations, feed and reflux rates, heights of reactive and stripping sections, were analyzed adequately by simulating calculations. A good operating mode was then obtained, which is helpful to the development of a new process.
