Removal of CO.sub.2 and/or H.sub.2 S and/or COS from gases containing these constituents
AssigneeBASF SE
InventorsMax Appl, Ulrich Wagner, Hans J. Henrici, Klaus Kuessner, Klaus Volkamer, Ernst Fuerst
Life of this patent
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Abstract
An aqueous solution containing from 0.81 to 1.3 moles of piperazine per liter is used as a washing agent for removing impurities such as H.sub.2 S, CO.sub.2 and COS from gases. Piperazine can also be used, in amounts of up to 0.8 mole per liter, together with physical or chemical solvents, to accelerate the absorption of H.sub.2 S, CO.sub.2 and COS. The washing process is used for natural gases, coke-oven gases, gases from the gasification of coal and synthesis gases, of any origin.
Claims9
In a process for removing CO.sub.2, H.sub.2 S or both as constituents from gases by washing the gases with an aqueous solution of a scrubbing liquid and subsequently regenerating the scrubbing liquid, the improvement which comprises:
- using a scrubbing liquid which contains
- (a) from about 0.05 to 0.8 mole/l of piperazine as an absorption accelerator and
- (b) from about 1.5 to 4.5 moles/l of methyldiethanolamine, and
- carrying out the washing of the gases with the scrubbing liquid at temperatures of from about 40.degree. C. upward.
In a process for removing CO.sub.2, H.sub.2 S or both as constituents from gases
- (a) by washing the gases with an aqueous solution of methyldiethanolamine as scrubbing liquid,
- (b) subsequently regenerating the scrubbing liquid and
- (c) recirculating the scrubbing liquid to the washing step (a), the improvement which comprises:
- using a scrubbing liquid which contains
- (d) from about 1.5 to 4.5 moles/l of methyldiethanolamine to which
- (e) from about 0.05 to 0.8 mole/l of piperazine is added, and
- (f) washing the gases with the scrubbing liquid at a temperature of from about 40.degree. C. upward.
Dependencies are inferred from the claim text.