混合胺复配溶液对二氧化碳的吸收/解吸
CO2 absorption/desorption using aqueous solution blended with mixed amine
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摘要: 醇胺法是目前捕集二氧化碳的主要化学方法之一.本文主要以混合胺吸收剂为基础，考察了三乙烯四胺（TETA）-活化剂-水体系的吸收和解吸再生能力，确定了以质量分数为12.5%的TETA为基础胺的高吸收速率低解吸能耗的混合胺复配吸收液.分别选取质量分数为2.5%二乙醇胺（DEA）、二乙烯三胺（DETA）、哌嗪（PZ）、2-氨基-2-甲基-1-丙醇（AMP）为活化剂，即基础胺与活化剂的质量比为5∶1，从CO2脱除率、吸收速率、吸收量、溶液负荷等指标来考察混合胺复配溶液体系的吸收情况，从中选取具有高吸收效率复配溶液进行解吸再生实验.解吸再生能力以解吸再生能耗、再生程度、再生速率等指标为依据，选取低再生能耗的混合复配溶液.实验表明，4种总质量分数为15%的TETA-活化剂复配溶液中，TETA-PZ的吸收效果最好、吸收量最大，同时解吸再生能耗最低，TETA-AMP复配体系其次.综合实验结果，选取TETA-环胺-水体系和TETA-空间位阻胺-水体系为最佳混合胺复配溶液体系.Abstract: Alcoholamine absorption is currently one of the main chemical methods for capturing carbon dioxide. Based on the mixed amine absorbent, the absorption and desorption regeneration ability of TETA-activator-water system was investigated at a mass ratio of 5:1. And the mass fraction of TETA was 12.5%. This paper selected DEA, DETA, PZ, AMP as activator with a mass fraction of 2.5%. The absorption of the mixed amine compound solution system was investigated for the CO2 removal rate, absorption rate, absorption amount, solution load and other indicators, and the compounding solution with high absorption efficiency was selected for desorption experiment. The regeneration capacity was based on desorption regeneration energy consumption, regeneration degree, regeneration rate and other indicators, and a mixed compound solution with low regeneration energy consumption was selected. Experiments show that in the four TETA-activator compound solutions with a mass fraction of 15%, TETA-PZ exhibited the best absorption effect and the largest absorption, while the regeneration energy consumption was the lowest. The TETA-AMP compounding system was the second. Based on the comprehensive experimental results, TETA-cyclic amine-water system and TETA-sterically hindered amine-water system were selected as the best mixed amine compound solution system.
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