Process for separating ammonia and acid gases from waste...

Details Process for separating ammonia and acid gases from waste... Process for separating ammonia and acid gases from waste...

B - Operations, Transporting

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B01D 3/38 (2006.01) B01D 19/00 (2006.01) C02F 1/04 (2006.01) C02F 1/58 (2006.01) C02F 1/66 (2006.01) C02F 5/14 (2006.01)

Patent

CA 1092052

PROCESS FOR SEPARATING ACID GASES AND AMMONIA FROM A DILUTE AQUEOUS SOLUTION ABSTRACT OF THE DISCLOSURE A water purification process is described for the removal of ammonia and optionally one or more acid gases from waste waters such as coke-plant or coal conversion waste waters. The process involves adding lime to these waste waters in amounts sufficient to react with fixed ammonia salts present in the waste water and to enable substantially all of the ammonia to be evolved upon distillation, adding a threshold amount of a scale inhibitor compound chosen from the class of certain organic phosphonates and subjecting the thus treated waste water to distillation to remove substantially all of the ammonia and acid gases present from the waste water. Preferably, this process is achieved by two separate and successive distillations. In this preferred process, the first distillation substantially reduces the amount of the acid gases and free ammonia. In the second distillation, the amount of fixed ammonia is substantially reduced.

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