Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Reexamination Certificate
2007-08-21
2007-08-21
Vanoy, Timothy C. (Department: 1754)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
C423S238000, C423S310000, C423S313000, C423S396000, C423S549000, C423S550000, C423S573100
Reexamination Certificate
active
11496385
ABSTRACT:
The present invention provides a process for removing ammonia as an aqueous salt solution from an acid gas comprising ammonia and hydrogen sulfide. A strong acid, such as sulfuric acid, is used as a scrubbing agent to convert ammonia to an ammonium salt. Control of pH and stripping in combination with reboiler or evaporators reduces hydrogen sulfide concentration. The ammonium salt is produced as an aqueous solution, which may crystallized to form a solid product. The ammonium salt solution or solid may be used as a fertilizer.
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Blackwell Benny E.
Chu Luis Alberto
Davis Monroe
Ely Wayne B.
Flowers Robert Joseph
E. I. du Pont de Nemours and Company
Vanoy Timothy C.
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