催化蒸馏合成乙二醇乙醚的过程模拟

修正了非平衡级速率模型,使之能适用于催化蒸馏过程的模拟.此催化蒸馏塔的精馏段和提馏段为一般的填料塔结构,而反应段为CR＆L公司提出的特定结构的催化剂填充层.采用专门测定此特殊结构的催化剂填充层的气膜和液膜传质系数关联式来计算反应段中的传质速率,用Onda的关联式计算精馏段和提馏段填充层中的传质速率.结合在NKC-01分子筛催化剂上环氧乙烷与乙醇反应的动力学方程式,采用Newton-Raphson技术完成了催化蒸馏合成乙二醇乙醚过程的模拟,结果是令人满意的.     

A comparison of a pseudo-homogeneous non-equilibrium model and a three-phase non-equilibrium model for catalytic distillation

A comparison of computer simulation results of catalytic distillation (CD) obtained from a three-phase non-equilibrium model and a pseudo-homogeneous non-equilibrium model was performed. Simulations were carried out on the CD processes for the production of ethyl cellosolve (EC) and diacetone alcohol (DAA) using both the pseudo-homogeneous non-equilibrium model and the three-phase non-equilibrium model. Similar results for the synthesis of EC were obtained using these two models. However, only the three-phase non-equilibrium model could adequately describe the CD process for the aldol condensation of acetone (Ac) at low reflux flow rates. Hence our results suggest that for a reaction system that is kinetically controlled, a pseudo-homogeneous non-equilibrium may adequately simulate the temperature profile, yield and selectivity for a CD process. However, for a CD process that is sensitive to solid–liquid mass transfer, the three-phase non-equilibrium model is required.