以AMP为主体的混合胺溶液捕集CO_2性能研究

Capture of carbon dioxide with blended amine solution based on AMP

空间位阻胺2-氨基-2-甲基-1-丙醇(AMP)捕集CO_2技术具有吸收容量大、低能耗、腐蚀性小等优势,但因其吸收速度慢,制约了该项技术的大规模应用。将AMP分别与乙醇胺(MEA)和N-氨乙基哌嗪(AEP)混合,探讨不同配比以AMP为主体的混合胺溶液捕获CO_2性能。结果表明:常温常压下,AMP和MEA的体积比为5∶5时,该混合胺捕集CO_2效果最佳,相对纯AMP溶液,吸收容量提高了12.34%,吸收速率提高了29.21%,解析速率提高了20.00%;AMP和AEP的体积比为7∶3时,捕集效果最佳,相对纯AMP溶液,吸收容量提高了9.680%,吸收速率提高了28.10%,解析速率提高了32.50%;在最佳配比时,AMP和MEA的混合胺溶液,与AMP和AEP的混合胺溶液相比较,前者吸收容量比后者大2.558%,吸收速率比后者快1.587%,解析速率比后者慢18.52%。

It is observed that sterical hindered amine 2-amino-2-methy-1-propanol（ AMP） has better characteristics in absorption capacity,energy saving and corrosive. However,the technology is limited in widespread use due to its quite slow absorption rate. AMP as subject was blended with monoethanolamine（ MEA） and N-ammonia ethyl piperazine（ AEP）,respectively,and the performances of capturing CO_2 under different ratio were discussed. The results show that the volume ratio 5/5 of CO_2 aqueous AMP/MEA solution is the optimum ratio. Compared with pure AMP solution at normal pressure and temperature,the absorption capacity is increased by 12. 34%,the absorption rate is enhanced by 29. 21%,the desorption rate is 20. 00%; the effect of capturing CO_2 is optimal when volume ratio of AMP/AEP solution is 7/3,compared with pure AMP solution at the above volume ratio,the absorption capacity is increased by 9. 680%,the absorption rate is enhanced by 28. 10%,and desorption rate is increased by 32. 50%. When AMP ＋ MEA blended amine solution is compared with that of AMP ＋ AEP at optimum ratio,the absorption capacity of the former is 2. 558% larger,absorption rate is 1. 587% faster,and desorption rate is 18. 52% slower in contrast of the latter.