高效有机硫脱除溶剂CT8-24的工业应用

针对常规甲基二乙醇胺（MDEA）脱硫溶剂对有机硫脱除率不高、含有机硫的天然气脱硫后不能满足GB17820—2018对管输气要求的问题，中国石油西南油气田公司天然气研究院开发了高效有机硫脱除溶剂CT8-24，在室内研究以及中间放大试验的基础上，在重庆天然气净化总厂引进分厂400×10⁴m³/d装置上进行了工业应用。考察了溶剂在不同循环量、处理量、吸收塔板数以及再生温度等条件下的吸收性能，确定了较适宜的工艺操作参数。结果表明，将引进分厂400×10⁴m³/d装置原用的MDEA水溶液改换为CT8-24后，装置运行平稳。在35层吸收塔板下，产品中H₂S含量＜6mg/m³，总硫＜20mg/m³，达到GB17820—2018的要求。同时分析研究了CT8-24类物理-化学溶剂对MDEA脱硫装置的适应性，为其他净化厂气质达标改造工作奠定了坚实基础。

Industrial application of efficient organic sulfur removal solvent CT8-24

Due to the low removal rate of organic sulfur by MDEA, it cannot meet the requirements for pipeline natural gas in GB 17820—2018. To solve this problem, the natural gas research institute has developed an efficient organic sulfur removal solvent (CT8-24). On the basis of indoor research and intermediate scale-up test, the industrial application is carried out on the 400×10³m³/d unit imported from Chongqing natural gas purification plant of PetroChina Southwest Oil and gas field company. The absorption performance of the solvent under different absorption tower plate number, regeneration temperature and circulation quantity of the solution was investigated, and the appropriate process parameters were determined. The results of industrial application showed that the operation of the unit was stable after transforming MDEA aqueous solution into CT8-24 solvent. Under the 35 layer absorption tray, the H₂S content in the product was less than 6mg/m³ and the total sulfur was less than 20mg/m³. The product gas met the latest requirements of GB 17820—2018. In addition, the adaptability of physical-chemical solvent to MDEA desulfurization unit was studied, which laid a solid foundation for the transformation of other purification plants.