B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 53/14 (2006.01) B01D 53/58 (2006.01) B01D 61/36 (2006.01) C01C 1/10 (2006.01) C01C 1/12 (2006.01)
Patent
CA 2749297
A process for the recovery of ammonia contained in a gaseous stream is described, said process comprising the following phases: (a) subjecting the gaseous stream containing ammonia to a washing (S) with an aqueous washing solution (5a) having a pH lower than 7.0, with the formation of a purified gaseous stream (6) and an aqueous solution (7) containing an ammonium salt; (b) subjecting the aqueous solution containing the ammonium salt coming from phase (a) to a distillation process (MD) 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 with the formation of a regenerated washing solution (16) and a gaseous stream (18) comprising NH3 and H2O; (c) recycling said generated washing solution to phase (a). The equipment for carying out the above process is also described.
La présente invention concerne un procédé de récupération de l'ammoniac contenu dans un flux gazeux, ledit procédé comprenant les phases suivantes consistant à : (a) soumettre le flux gazeux contenant de l'ammoniac à un lavage (S) avec une solution de lavage aqueuse (5a) ayant un pH inférieur à 7,0, avec formation d'un flux gazeux purifié (6) et d'une solution aqueuse (7) contenant un sel d'ammonium; (b) soumettre la solution aqueuse contenant le sel d'ammonium provenant de la phase (a) à un processus de distillation (MD) avec une membrane microporeuse hydrophobe à une température comprise entre 50 et 250°C et une pression comprise entre 50 KPa et 4MPa absolus, avec formation d'une solution de lavage régénérée (16) et d'un flux gazeux (18) comprenant NH3 et H2O; (c) recycler ladite solution de lavage régénérée en phase (a). La présente invention concerne également l'équipement permettant d'effectuer le procédé précité.
Casara Paolo
Gianazza Alessandro
Miracca Ivano
Robic
Saipem S.p.a.
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