Separation of co2 and h2s from gas mixtures
Abstract
Abstract METHOD FOR REMOVING CO2 AND H2S FROM GAS MIXTURES IN A TWO-STEP SYSTEM IN WHICH THE FIRST STEP REMOVES THE BULK OF THE ACID GAS BY SCRUBBING WITH AN AQUEOUS ALKALINE SCRUBBING SOLUTION IN A HIGH-PRESSURE ABSORPTION ZONE MAINTAINED AT A TEMPERATURE NEAR THE ATMOSPHERIC BOILING POINT OF THE SOLUTION. THE SECOND PURIFICATION STEP, WHERE THE ACID GAS CONTENT IS REDUCED TO LOW RESIDUAL LEVELS, IS CARRIED OUT BY CONTACTING THE PARTIALLY PURIFIED GAS IN A SECOND, SEPARATE HIGH-PRESSURE ABSORPTION ZONE WITH A SECOND AQUEOUS SCRUBBING SOLUTION HAVING A DIFFERENT COMPOSITION THAN THE FIRST AND COMPRISING POTASSIUM CARBONATE CONTAINING AT LEAST ABOUT 6% BY WEIGHT OF AN ALKANOLAMINE, THE SOLUTION TEMPERATURE IN THE SECOND STEP BEING MAINTAINED AT AN INTERMEDIATE ABSORPTION TEMPERATURE OF FROM ABOUT 50* C. TO 90* C., AND PREFERABLY 60* C. TO 80* C. D R A W I N G
Inventors
- 👤 Homer E Benson
Bibliographic Details
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