Puguang Gas Field uses Methyldiethanolamine (MDEA) as the desulfurization solution for purification plant devices. In producing process, the formulated amine solvent is easily to go bad and foam during the cyclic process in devices, which would influence the desulfurization effect. The cyclic amine solution components are analyzed by using the united testing method of Gas Chromatography-Mass Spectrometer (GC-MS). Amine solution degradation under different conditions is simulated in laboratory, and the degradation products are studied by using GC-MS and the high resolution mass spectrometry analytical method. Through comparison it is found that the degradation products come from CO2 indeed exist in cyclic amine solution.Main degradation products are chosen to be added in-to new MDEA solution as the model component, and then the foaming law of the solution is studied. The research result shows that the foaming inducement of the desulfurization amine solvent is the degra-dation products, and among them HMP and Bicine have more obvious effect on the foaming of MDEA solution.%普光气田采用甲基二乙醇胺(MDEA)作为天然气净化厂装置脱硫的溶剂.生产过程中,该溶剂配制的胺液在装置内部循环过程中易变质发泡,从而影响脱硫效果.通过气相色谱-质谱联合测试法(GC-MS)分析循环胺液的组分,在实验室模拟不同条件下的胺液降解,并采用GC-MS和高分辨质谱定性分析降解产物的组分,对比发现,循环胺液中确实存在部分CO2导致的降解产物.选取主要的降解产物以模型组分方式加入新配制的MDEA溶液中,考察其导致溶液发泡的规律.研究结果证明,脱硫胺液的发泡诱因为降解产物,并且其中的HMP和Bicine对MDEA溶液发泡产生较为明显的影响.
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