摘要
因为叔胺(MDEA)与CO_2缓慢地发生反应,而与H_2S发生飞速瞬即反应,有CO_2存在时,用MDEA水溶液能很好地达到选择性脱除H_2S的目的,但是在很多场合也有要求脱除大量CO_2,MDEA与CO_2的缓慢反应就不相宜了。加入反应性强的DEA或哌嗪(piperazine,Pz)等作为活化剂形成混合胺,亦即活化甲基二乙醇胺工艺可克服这一缺点。尽管这一工艺投资费用相对较高,溶剂较贵,但其易操作、适应性强、低能耗等优点,仍吸引新建或其它改建装置采用这一工艺。本文扼要地讨论了活化甲基二乙醇胺脱碳工艺中的热力学和动力学上的要点。
Selective removal of H,S in the pres- ence of CO,is best accomplished with aqueous tertiary amine such as MDEA because the tertiary amine react slowly with CO_2 and very rapidly with H_2S.However,in many case,where a large amount of CO_2 removal is also required,the slow reaction of MDEA with CO_2 becomes a problem.The disadvantage of MDEA can be over- come by adding the more reactive DEA or piperazine as activated agent to form mixed solvent,i.e.activated methyldiethanolamine technology.Despite relatively high capital cost and expensive solvent,the advantages of flexibility,ease of operation,and low energy expend- iture have made it attractive for new installations as well as revamps.Thermodynamieal and kinetie key points in the bulk removing carbon dioxide with this technology are briefly detailed in this paper.
出处
《石油与天然气化工》
CAS
CSCD
北大核心
2007年第5期382-384,392,共4页
Chemical engineering of oil & gas
