Process for maintaining the performance of aqueous

专利名称：Process for maintaining the performance of

aqueous hindered amine scrubbing liquid inacid gas scrubbing

发明人：Say, Geoffrey Rhys,Hays Sr., James

Richard,Iyengar, Jagannathan Nambi

申请号：EP79302994.3申请日：19791220公开号：EP0013151A1公开日：19800709

专利附图：

摘要：Acid gases such as CO2 and H2S are scrubbed from a gas mixture in an

absorption zone (2) employing an aqueous solution (22) comprising an alkali metalcompound and a sterically hindered amine of formula: R-NH2-(CH2)m-NH2 in which R is asecondary or tertiary alkyl or cycloalkyl C4 to C20 hydrocarbon group and m is from 2 to5, under elevated temperature and pressure causing the formation of a cyclic urea offormula: in which R is a secondary or tertiary C4 to C20 alkyl or cycloalkyl hydrocarbonand m is from 0 to 3. The solution containing absorbed acid gases is steam stripped in aregeneration zone (6, 8) and a portion of the resulting lean solution is cooled (in 19) to atemperature at which the cyclic urea selectively precipitates. The cooled portion of thesolution is passed through a filter (16 or 17) to separate the cyclic urea solids beforebeing recirculated (23) with the rest (21) of the lean solution to the absorption zone (2).

申请人：EXXON RESEARCH AND ENGINEERING COMPANY

地址：P.O.Box 390, 180 Park Avenue Florham Park, New Jersey 07932-0390 US

国籍：US

代理机构：Somers, Harold Arnold

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