Process for removing sulfide from alkaline washing liquids

B - Operations – Transporting – 01 – D

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B01D 53/14 (2006.01) C02F 1/469 (2006.01) C02F 3/34 (2006.01) C02F 9/00 (2006.01)

Patent

CA 2710424

Alkaline solutions resulting from extracting sulfide from hydrocarbon fluids can be treated in a combination of one or more electrodialysis cells and a bioreactor. The electrodialysis cell (2) comprises an anode (4), a cathode (5), an electric power supply (7) and afirst (12) and a second (11) compartment separated from each other by an anion exchange membrane (9). The alkaline solution is fed into the first compartment at the cathode side and the diluate (sulfide-depleted stream)leaving the first compartment has alowered sulfide content and can be reused as the alkaline extractant solution. The concentrate (sulfide-enriched stream) leaving the second compartment is treated in the bioreactor (3) for removing sulfide and is then returned.

Des solutions alcalines obtenues à partir de l'extraction de sulfure à partir d'hydrocarbures fluides peuvent être traitées dans une combinaison d'une ou plusieurs cellules d'électrodialyse et d'un bioréacteur. La cellule d'électrodialyse (2) comprend une anode (4), une cathode (5), une alimentation électrique (7) et un premier (12) et un second (11) compartiment séparés l'un de l'autre par une membrane échangeuse d'anions (9). La solution alcaline est introduite dans le premier compartiment du côté cathode et le diluat (courant appauvri en sulfure) quittant le premier compartiment présente une teneur en sulfure réduite et peut être réutilisé comme solution d'agent d'extraction alcalin. Le concentré (courant enrichi en sulfure) quittant le second compartiment est traité dans le bioréacteur (3) pour l'élimination du sulfure et est ensuite renvoyé.

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