Back to results
US 12,312,248 B2Granted
Systems and methods for ammonia purification
AssigneeBechtel Energy Technologies & Solutions, Inc.
InventorsCharles Kimtantas, Martin Taylor
Life of this patent
Estimating the term…
Abstract
The present disclosure generally relates to systems and methods for ammonia purification. More particularly, the systems and methods use a unique arrangement of a caustic wash, a water wash, an ammonia stripper and a caustic fractionator to recover ammonia otherwise lost during conventional purification.
Claims20
A system for ammonia purification, which comprises:
- a caustic scrubber in fluid communication with a feed gas stream, a caustic solution stream, a first ammonia vapor stream and a second ammonia vapor stream for producing a scrubbed ammonia stream and a spent caustic stream;
- a compression train system with at least two compression stages for separating the scrubbed ammonia stream into a non-condensable vapor stream and an anhydrous ammonia liquid product stream;
- an ammonia stripper for separating a sour water liquid stream into the first ammonia vapor stream and a liquid effluent stream;
- a caustic fractionator in fluid communication with the spent caustic stream for producing a liquid bottom stream and an overhead vapor stream;
- a condenser in fluid communication with the overhead vapor stream for producing a two-phase stream comprising water and ammonia;
- and
- a reflux drum for separating the two-phase stream into a liquid water stream and the second ammonia vapor stream.
4 more elements
A method for ammonia purification, which comprises:
- introducing a feed gas stream, a caustic solution stream, a first ammonia vapor stream and a second ammonia vapor stream into a caustic scrubber for producing a scrubbed ammonia stream and a spent caustic stream;
- separating the scrubbed ammonia stream into a sour water liquid stream, a non-condensable vapor stream and an anhydrous ammonia liquid product stream;
- separating the sour water liquid stream into the first ammonia vapor stream and a liquid effluent stream;
- introducing the spent caustic stream a caustic fractionator for producing a liquid bottom stream and an overhead vapor stream;
- introducing the overhead vapor stream into a condenser for producing a two-phase stream comprising water and ammonia;
- and
- separating the two-phase stream into a liquid water stream and the second ammonia vapor stream.
4 more elements
Dependencies are inferred from the claim text.