在煤基合成气制乙二醇（SEG）的反应过程中,会发生多种副反应、生成多种副产物,其中,微量的酯类、醛类物质对乙二醇产品紫外线透光率造成很大影响。通过技术改造增设脱酯、脱醛装置,对产品精馏塔侧线采出的乙二醇进行脱酯脱醛处理。实际运行数据表明,脱酯、脱醛后乙二醇220nm紫外线透光率平均能提升6%~14%,275nm紫外透光率平均能提升8%~15%。介绍了煤制乙二醇脱酯、脱醛装置的树脂装填、装置开停车、树脂保护,脱酯脱醛装置运行经验及控制,可为乙二醇生产厂家进行产品质量提升提供参考和借鉴。
关键词: 脱酯 / 脱醛 / 煤制乙二醇 / 运行分析 / 紫外透光率
Abstract:
When producing ethylene glycol（SEG）from coal-based syngas , a variety of side reactions will generate by-products , among which , trace esters and aldehydes have a great impact on the ultraviolet（Uv）transmittance of ethylene glycol products. De-ester and de-aldehyde devices are thus added in technical transformation to remove esters and aldehydes from the sideline of the product rectification column. Actual operating da- ta shows that Uv transmittance rates of ethylene glycol at220nm and275nm can be improved by6%~14%and8%~15%on average respec- tively before and after removal of ester and aldehyde. This paper introduces the resin loading , startup and shutdown of the plant , resin protec- tion , operation eXperience and control of de-ester and de-aldehyde devicesin coal-to-ethylene glycol production , which can be of certain reference valuefor ethylene glycol manufacturers to elevate product quality.
Keywords: de-ester / de-aldehyde / coal to ethylene glycol / operation analysis / ultraviolet transmittance