Patent Number: 8,715,504

Title: Process for removing sulfide from alkaline washing liquids

Abstract: 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) includes an anode (4), a cathode (5), an electric power supply (7) and a first (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 a lowered 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.

Inventors: Rozendal; Rene Alexander (Hoorn, NL), Vellinga; Sjoerd Hubertus Josef (Tjalleberd, NL), van Zessen; Erik (Heerenveen, NL)

Assignee: Paques I.P. B.V.

International Classification: C02F 1/469 (20060101); C02F 9/06 (20060101)

Expiration Date: 5/06/12018