三乙醇胺与烯胺混合胺液脱碳性能及配比优选实验研究

胺法脱碳以其脱除效果好、能耗低等优点在天然气预处理中得到广泛应用。目前国内外普遍采用以甲基二乙醇胺为主体的复配胺液为吸收剂,为适应寻找经济、高效的新型吸收剂的需求,本文选取同为叔胺的三乙醇胺(TEA)为主体进行实验研究,在TEA反应机理的研究基础上,添加二乙烯三胺/三乙烯四胺(DETA/TETA)进行混合胺液的吸收解吸性能分析,对比优选出综合表现较好的混合胺液,考察其不同配比下吸收、解吸及贴近实际生产的循环利用效果,完成配比优选研究。结果表明:添加烯胺后,可大大提高吸收性能,但会降低解吸效果;TEA+DETA吸收和解吸性能优于TEA+TETA;TEA+DETA的优选配比为2.0/1.0和2.4/0.6;经循环实验验证,2mol/L TEA+1mol/L DETA综合效果最佳。

Experimental study on performance and proportion optimization of TEA+enamine mixed solution for natural gas decarburization

Decarburization by mixed amine solution has been widely used because of its good purification ability and low energy consumption. MDEA is used as the main absorbent in the mixed amines. In order to meet the demands of finding economical and highly efficient new absorbents, TEA was selected as the main amine solution for experimental study in this paper, which was tertiary amine, the same as MDEA. Based on the study of TEA solution reaction mechanism, the absorption and desorption performance of the TEA+DETA/TETA mixed amine solutions with different concentrations were studied experimentally, and the better amine solution was selected based on comprehensive performance. Enamines could promote absorption ability, but it would reduce desorption performance. The absorption and desorption performance of the TEA+DETA mixed amine solution was better than the TEA+TETA mixed amine solution. The mixed amine solutions with DETA concentrations of 1mol/L and 0.6mol/L were better. According to cycle experiments, the comprehensive performance of the mixed amine solution with DETA concentration of 1mol/L was the best.