B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/58 (2006.01) C01C 1/18 (2006.01) C10K 1/10 (2006.01) C10L 3/10 (2006.01)
Patent
CA 2659286
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.
La présente invention concerne un procédé d'élimination d'ammoniac sous forme d'une solution saline aqueuse à partir d'un gaz acide comprenant de l'ammoniac et du sulfure d'hydrogène. Un acide fort, tel que l'acide sulfurique, est utilisé comme agent d'épuration pour transformer l'ammoniac en un sel d'ammonium. La modulation du pH et la revaporisation en combinaison avec des bouilleurs ou des évaporateurs réduisent la concentration de sulfure d'hydrogène. Le sel d'ammonium est obtenu sous forme d'une solution aqueuse, qui peut être cristallisée pour former un produit solide. La solution ou le solide de sel d'ammonium peut être utilisé comme engrais.
Blackwell Benny E.
Chu Luis Alberto
Davis Monroe
Ely Wayne B.
Flowers Robert Joseph
E.i. Du Pont de Nemours And Company
Torys Llp
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