天然气胺法脱碳吸收反应热实验研究

采用自主设计的绝热反应量热仪测定了N-甲基二乙醇胺(MDEA)、哌嗪(PZ)以及2-氨基-2-甲基-1-丙醇(AMP)在不同条件下吸收CO₂的反应热，考察了CO₂负载量、总胺质量分数、温度、压力及混合溶液的配比等对吸收反应热的影响。结果表明：MDEA溶液的反应热明显低于PZ和AMP，其反应热范围为50~55 kJ/(mol CO₂)，而PZ和AMP的反应热范围为65~70 kJ/(mol CO₂)；各影响因素对反应热变化规律影响程度不同，其中醇胺种类影响最大，其次为CO₂负载量。在MDEA溶液中添加PZ或AMP构成的二元复配胺液，其反应热相比于MDEA溶液分别提高了5~10、10~12 kJ/(mol CO₂)。在二元复配胺液38%MDEA+2%PZ基础上，分别加入AMP、乙醇胺(MEA)、二乙醇胺(DEA)以及三乙胺(TEA)构成的三元复配胺液中，加入MEA和DEA后反应热升高较为明显，分别达到了78和73 kJ/(mol CO₂)，加入TEA后反应热有所降低，而加入AMP后反应热基本保持不变。

Experimental Study on Absorption Reaction Heat for Natural Gas Decarbonization by Amine Method

This paper uses a self-designed adiabatic reaction calorimeter to determine the reaction heat of CO₂ absorption by N-methyldiethanolamine (MDEA), piperazine (PZ) and 2-amino-2-methyl-1-propanol (AMP) under different conditions, and explores the effects of CO₂ loading, total amine mass fraction, temperature, pressure and the ratio of mixed solution on the absorption reaction heat. The results show that the reaction heat of MDEA solution is obviously lower than that of PZ and AMP solution, ranging from 50—55 kJ/(mol CO₂), while that of PZ and AMP is within the range of 65—70 kJ/(mol CO₂). It thus can be seen that various factors have different influences on the change law of reaction heat, among which the type of alcohol amine is the primary influencing factor, followed by CO₂ loading. The reaction heat of binary compound amine solution with PZ or AMP as additive is increased separately by 5—10 kJ/(mol CO₂) and 10—12 kJ/(mol CO₂) as compared with that of MDEA solution. On the basis of binary compound amine solution (38%MDEA+2%PZ), the reaction heat of the ternary compound amine solution prepared by adding AMP, ethanolamine (MEA), diethanolamine (DEA) and triethylamine (TEA) in the binary compound amine solution (38%MDEA+2%PZ) has a significant rise, reaching 78 and 73 kJ/(mol CO₂), respectively. The reaction heat decreased after the addition of TEA, but remains unchanged after the addition of AMP.