研究了熔融结晶法从异丙苯装置脱苯塔的塔顶产物（污苯）中回收苯的工艺条件。考察了不同操作条件对污苯结晶效果和苯回收率的影响，确定了熔融结晶操作的最佳条件。降温结晶的最佳操作条件：结晶恒温时间为90 min，结晶终温为-28℃。发汗操作的最佳操作条件：恒温时间为90 min，升温速率为0.10℃/min，发汗结晶终温为-15.0℃。在最佳工艺条件下，单级熔融结晶实验所得产品纯度在86.0%~96.0%之间，苯的回收率大于35.0%，将污苯经两级熔融结晶最终可得到苯质量分数大于99.50%的产品，可以作为合成异丙苯的原料被回收利用。

The process conditions of melt crystallization method in recovering benzene from the column top products (light benzene) of benzene stripping column in cumene production facility are experimentally studied.Effects of the different operating conditions on the crystallization efficiency of light benzene and the recovery rate of benzene are investigated and the optimum operational conditions for melt crystallization are determined.The best operational conditions during the cooling crystallization section are that the time for constant temperature crystallization is 90 min and the final temperature of crystallization is -28℃.The optimal operational conditions during the sweating crystallization section are as follows:the heating rate is 0.10℃/min,the time for constant temperature sweating crystallization is 90 min and the final temperature of sweating crystallization is -15℃.The purity of benzene product obtained by single grade melt crystallization experiment can be in the range of 86.0%-96.0% and the recovery rate of benzene can exceed 35%.What's more,99.5% benzene can be finally obtained by dual grade melt crystallization of light benzene and can be recycled as raw material for cumene production.

高松(1991-),男,硕士研究生,研究方向为工业催化,gaos_buct@163.com。