Patent ID: 8758485

Claim:
A process for removing ammonia from a gaseous stream, the process comprising: (a) washing a gaseous stream comprising ammonia with an aqueous washing solution having a pH of lower than 7.0 and comprising a conjugate acid-base pair deriving from phthalic acid, oxalic acid, phosphoric acid, citric acid, an aryl-phosphonic acid, and an alkyl-phosphonic acid, to obtain a purified gaseous stream and an aqueous solution comprising an ammonium salt; (b) distilling the aqueous solution comprising the ammonium salt from (a) with a hydrophobic microporous membrane at a temperature ranging from 50 to 250° C. and a pressure ranging from 50 KPa to 4 MPa absolute, to obtain a regenerated washing solution and a gaseous stream comprising NH3 and H20, (c) recycling the regenerated washing solution into (a).