摘要：
采用共沸精馏的方法分离2-甲基吡啶和水二元均相共沸物系.选取环己烷作为共沸剂,利用流程模拟软件Aspen Plus对共沸精馏塔进行模拟计算,分析了不同共沸剂用量、塔底采出量以及进料位置等操作参数对产品纯度、共沸剂的损失量以及精馏塔热负荷的影响,模拟结果表明当精馏塔的塔板数为21,共沸剂的用量为3600kg/h,塔底采出量为888kg/h,原料进料位置在第15块板时,共沸精馏塔塔底可得到质量分数为99.54％ 的2-甲基吡啶,塔顶分相罐下层可采出质量分数为99.97％ 的水.最后,通过间歇共沸精馏实验对以环己烷为共沸剂分离2-甲基吡啶-水物系的效果进行检验,结果表明共沸精馏塔塔底2-甲基吡啶的质量分数达99.85％,塔顶水相可采出质量分数达99.96％的水,证明了该工艺路线具有良好的可行性.%Azeotropic distillation was used to separate 2-methylpyridine and water azeotropic mixture. First,cyclohexane was chosen as the azeotropic entrainer. Second,Aspen Plus were used to simulate the continuous azotropic distillation process. The effects of entrainer flow rate and output quantity at the bottom and feed location on the product purity and heat duty were analyzed to get the optimal operation parameters. The result indicated that when the theoretical stage number was 21,the entrainer flow rate was 3600kg/h,the output quantity at the bottom was 888kg/h,and the feed location was 15, the purity of 2-methylpyridine and water can achieve as 99.54％ and 99.97％,respectively. Finally,in order to investigate the effectiveness of the solvent,the batch azeotropic distillation experiments were carried out. The results showed that the purity of 2-methylpyridine and water can achieve as 99.85％ and 99.96％,respectively,which revealed that cyclohexane was an ideal azeotropic agent and the azeotropic distillation was useful in the separation of 2-methylpyridine and water system.
