Abstract: Amine decarbonization is widely used in natural gas pretreatment on account of its good removal result and low energy consumption. According to the survey,MDEA is widely used as the main absorbent in mixed amine solutions. In order to find new absorbents,which are economic and highly efficient,TEA is selected as the main amine solution for experimental study in this paper. Both TEA and MDEA are tertiary amines. According to the reaction mechanism of TEA solution,PZ is selected as the additive to study the decarburization performance of TEA+PZ mixed amine solution. The absorption,desorption and cycle performance of TEA+PZ mixed amine solution with different ratios are investigated. The experimental results show that the absorption performance of TEA+PZ mixed amine solution was improved when the amount of PZ increases,but this phenomenon will not be obvious with the further increase of PZ. The addition of PZ has no significant effect on the desorption performance of TEA.

Key words: triethandamine(TEA), piperazidine(PZ), mixed amine solution, natural gas, carbon dioxide, absorption, desorption

摘要： 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MDEA为主体的复配胺液为吸收剂.本文选取同为叔胺的TEA为主体进行实验研究,在TEA反应机理的研究基础上,选取哌嗪作为添加剂,对三乙醇胺+哌嗪混合胺液进行脱碳性能研究,通过吸收、解吸及酸解实验,对不同配比的三乙醇胺+哌嗪混合胺液的吸收、解吸及循环性能进行了深入地对比分析.实验结果表明,哌嗪的添加量越大,三乙醇胺+哌嗪混合胺液的吸收效果越好,但这一现象会随着哌嗪添加量的增大而不明显.而添加哌嗪对三乙醇胺的解吸性能并无明显改善.

关键词: 三乙醇胺, 哌嗪, 混合胺液, 天然气, 二氧化碳, 吸收, 解吸