合成气制乙二醇酯化反应塔工艺方案优化

简述了合成气制乙二醇的工艺流程,对比了流程中酯化反应塔并流塔外加氧和并流塔内加氧的两种流程配置,针对紧急处置时采用氮气置换反应气存在的NO损失增加、影响运行稳定性等问题,提出了取消氮气吹扫设置,在酯化反应塔内置换热管组、通过冷却介质对塔内温度进行调节的方案,介绍了该方案的具体流程配置,对比了紧急置换氮气配置与内置换热管组配置的投资、运行、设备配置等。结果表明,内置换热管组配置方案投资省、无NO损失,可实现乙二醇装置的平稳运行。

Process Scheme Optimization of Esterification Reaction Column of Syngas to Ethylene Glycol

The process flow of syngas to ethylene glycol was briefly described.The two process configurations of adding oxygen outside/inside the parallel flow tower of the esterification reaction column were compared.In view of the increase of NO loss and the impact on the operation stability when nitrogen was used to replace reaction gas in case of emergency,a scheme was proposed to cancel the nitrogen purge,build the heat exchange tubes in the esterification reaction column,and adjust the temperature in the column through the cooling medium.Also,the specific process configuration of the scheme was introduced,and the comparison was made on the investment,operation and equipment configuration between the emergency nitrogen displacement configuration and the built-in heat exchange tube configuration.The results showed that the scheme of built-in heat exchange tube saved investment and had no NO loss,and the stable operation of ethylene glycol unit could be realized.