Process for separating off acid gases from a water-comprising fluid stream
First Claim
1. A process for separating off acid gases from a water-comprising fluid stream, said process comprisinga) contacting the water-comprising fluid stream in an absorption zone with an absorbent that comprises at least one amine, wherein a deacidified fluid stream and an acid gas-loaded absorbent is obtained,b) contacting the deacidified fluid stream in a scrubbing zone with a single pass of an aqueous scrubbing liquid to transfer at least in part entrained amine in the deacidified fluid stream to the scrubbing liquid, the scrubbing liquid flowing out of the scrubbing zone without recirculating to the scrubbing zone, and a deaminated, deacidified fluid stream and an amine-loaded scrubbing liquid are obtained,c) cooling the deaminated, deacidified fluid stream in an indirect cooler downstream of the scrubbing zone, wherein an absorber top condensate is condensed out of the deaminated, deacidified fluid stream,d) passing the loaded absorbent into a desorption zone in which acid gases are at least in part released, wherein a regenerated absorbent and desorbed acid gases are obtained,e) returning the regenerated absorbent to the absorption zone in order to form an absorbent circuit,f) introducing the amine-loaded scrubbing liquid and the absorber top condensate into the absorbent circuit, andg) conducting the desorbed acid gases through an enrichment zone and cooling the acid gases exiting at the top of the enrichment zone, in order to condense out of the acid gases a desorber top condensate which in part is returned to the enrichment zone and in part is passed out of the process.
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Abstract
A process for separating off acid gases from a water-comprising fluid stream wherein the water-comprising fluid stream is contacted in an absorption zone with an absorbent, producing a deacidified fluid stream and an acid gas-loaded absorbent; the deacidified fluid stream is contacted in a scrubbing zone with an aqueous scrubbing liquid, producing a deaminated, deacidified fluid stream and an amine-loaded scrubbing liquid which is cooled, producing an absorber top condensate; the loaded absorbent is passed into a desorption zone producing a regenerated absorbent and desorbed acid gases; the regenerated absorbent is returned to the absorption zone in order to form an absorbent circuit, to which the amine-loaded scrubbing liquid and the absorber top condensate are introduced; and the desorbed acid gases are conducted through an enrichment zone and the acid gases exiting at the top of the enrichment zone are cooled, producing a desorber top condensate.
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Citations
17 Claims
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1. A process for separating off acid gases from a water-comprising fluid stream, said process comprising
a) contacting the water-comprising fluid stream in an absorption zone with an absorbent that comprises at least one amine, wherein a deacidified fluid stream and an acid gas-loaded absorbent is obtained, b) contacting the deacidified fluid stream in a scrubbing zone with a single pass of an aqueous scrubbing liquid to transfer at least in part entrained amine in the deacidified fluid stream to the scrubbing liquid, the scrubbing liquid flowing out of the scrubbing zone without recirculating to the scrubbing zone, and a deaminated, deacidified fluid stream and an amine-loaded scrubbing liquid are obtained, c) cooling the deaminated, deacidified fluid stream in an indirect cooler downstream of the scrubbing zone, wherein an absorber top condensate is condensed out of the deaminated, deacidified fluid stream, d) passing the loaded absorbent into a desorption zone in which acid gases are at least in part released, wherein a regenerated absorbent and desorbed acid gases are obtained, e) returning the regenerated absorbent to the absorption zone in order to form an absorbent circuit, f) introducing the amine-loaded scrubbing liquid and the absorber top condensate into the absorbent circuit, and g) conducting the desorbed acid gases through an enrichment zone and cooling the acid gases exiting at the top of the enrichment zone, in order to condense out of the acid gases a desorber top condensate which in part is returned to the enrichment zone and in part is passed out of the process.
Specification