Patent ID: 7604684
Filing Date: 2009-10-20
Classification: B01D,C01B,C10L,Y02P

Abstract:
1. Method for selective removal of hydrogen sulphides, organic sulphur components and CO 2 from crude gases, by using a first absorption stage ( 41 ) and a second absorption stage ( 49 ) for separating almost pure CO 2 and using a desorption stage ( 50 ) for extracting a gas rich in hydrogen sulphide, whereby the regenerated absorbing substance from the desorption stage ( 50 ) is again guided back to both the absorption stages ( 41 , 49 ), whereby as absorbing substance one uses a chemically non-active solvent, wherein the absorption agent enriched with hydrogen sulphide, organic sulphur compounds and CO 2 and coming out of the first absorption stage ( 41 ), finds itself at an increased pressure between the pressure of the absorption column ( 41 ) and the pressure of the desorption column ( 50 ), and is pre-heated with the hot-regenerated solution ( 12 ) coming from the desorption stage ( 50 ) in a heat exchanger ( 44 ), and is then de-stressed at a selected pressure greater than the increased pressure in a high pressure flash container ( 47 ), whereby the gas flow released at the increased temperature is cooled in a condenser ( 48 ) and then guided to the second absorption stage ( 40 ), in which the sulphur components are completely removed with the help of (already mentioned) the part-flow the regenerated absorption agent ( 15 , 16 , 17 ) coming from the desorption stage ( 50 ), whereby the absorption agent is guided back ( 26 / 27 ) out of the second absorption stage ( 49 ) into the desorption stage ( 50 ); wherein the enriched absorption solution leaving the high pressure flash container (