醋酸乙烯精制工艺中TQ-203塔的参数模拟优化与技术改造

针对某工厂醋酸乙烯精制工艺TQ-203塔存在处理量不能满足生产要求、能耗较高的问题，运用流程模拟软件Aspen Plus对TQ-203塔进行模拟，选取最接近生产实际的NRTL模型，确定了理论板数为31块。由单因素分析给出了较优的参数范围，利用正交实验方法得到的最佳参数组合为：进料位置为第5块理论板，回流比为2.30，侧线采出位置为第29块理论板。根据上述结果提出对TQ-203塔更换塔板、调整进料及侧线采出位置的改进措施，能够满足该塔对处理量及产品纯度的生产要求；提出了侧线采出预热进料和采用第五精馏塔侧线采出做本塔塔釜热源的节能措施，该措施能节省水蒸汽(0.4MPa)12.56t/h、循环冷却水434.54t/h，可取得经济效益1495万元/a。

Simulation and optimization of the tower in a commercial vinyl acetate refining process

This paper targets the problem of handling capacity not meeting the production requirements and the high energy consumption in tower TQ-203 in a commercial vinyl acetate refining process. The process simulation software Aspen Plus was used simulate the vinyl acetate distillation tower, and the NRTL model which was close to the actual production parameters was selected. The number of theoretical plates used was 31. Orthogonal experimental analysis methods were used to obtain the best combination of the parameters to improve the design and operation parameters: the best location of the feed was found to be the 5^th theoretical plate, with a reflux ratio of 2.30, and the side cutting position at the 29^ththeoretical plate. Using the above parameters resulted in improvements and the production requirements being met. Two energy-saving measures including preheating the feed on the tower side and the side draw of TQ-205 heating the tower reactor of TQ-203 were proposed, which could reduce vapor (0.4MPa) flow to 12.56t/h and circulating cooling water flow to 434.54t/h, resulting in economic benefits of 14.95 million yuan/a.