Process for the recovery of sulfuric acid using polymeric...

C - Chemistry – Metallurgy – 01 – B

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C01B 17/92 (2006.01) B01D 61/02 (2006.01) B01D 61/14 (2006.01) B01D 61/24 (2006.01) B01D 61/36 (2006.01) B01D 61/58 (2006.01) B01D 71/38 (2006.01) C01B 17/90 (2006.01) C07C 2/62 (2006.01)

Patent

CA 2515011

A method for recovering acid from a feed mixture comprising acid, hydrocarbons and water, the method comprising: processing said mixture using a first polymeric membrane to form a first retentate containing a substantially greater concentration of hydrocarbons than said feed mixture and a first permeate containing a substantially greater concentration of acid and water than said mixture, said first polymeric membrane being selectively permeable to the acid and water over the hydrocarbons found in the mixture, and recovering the first permeate; said first permeate can be processed further using a second water reduction mean to form a first stream containing a substantially greater concentration of acid than said first permeate and a second stream containing a substantially greater concentration of water than said first permeate, said water reduction step may be a second polymeric membrane being selectively permeable to the water over the acid in said first permeate; and recovering said second stream or retentate.

L'invention concerne un procédé de récupération d'acide à partir d'un mélange d'alimentation contenant de l'acide, des hydrocarbures et de l'eau, le procédé consistant: à traiter ledit mélange à l'aide d'une première membrane polymère pour former un premier retentat contenant une concentration d'hydrocarbures sensiblement supérieure à celle dudit mélange d'alimentation, et un premier perméat contenant une concentration d'acide et d'eau sensiblement supérieure à celle dudit mélange, ladite première membrane polymère étant perméable sélectivement à l'acide et à l'eau sur les hydrocarbures rencontrés dans le mélange, et à récupérer le premier perméat; ledit premier perméat peut être traité à nouveau à l'aide d'un second moyen de réduction d'eau pour former un premier flux contenant une concentration d'acide sensiblement supérieure à celle dudit premier perméat et un second flux contenant une concentration d'eau sensiblement supérieure à celle du premier perméat, ladite étape de réduction d'eau peut être exécutée au moyen d'une seconde membrane polymère laquelle est perméable sélectivement à l'eau sur l'acide dans ledit premier perméat; et à récupérer ledit second flux ou retentat.

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