Process for sour water treatment
AssigneeShell Oil Company
InventorsGeorge C. Blytas, Rudolf J. Maas, Andreas B. van Aken, Christiaan van Schalkwijk
Life of this patent
Estimating the term…
Abstract
A process for sour water treatment in which the sour components are removed from a sour water stream in an electrodialysis step in which the sour water stream becomes the dilute stream. A resulting concentrate stream, richer in the sour components than the original stream is then steam stripped. In order to balance the acid and basic components in the dilute stream the component lacking may be added to the stream. In order to prevent build-up of non-strippable components in the concentrate stream a part of the latter is recombined with the dilute stream either before or after the electrodialysis step.
Claims8
A process for treating a sour water stream containing H.sub.2 S and NH.sub.3 to remove a volatile acidic component and a volatile basic component, which comprises subjecting the stream to an electrodialysis step in which the acidic component and the basic component migrate through fixed anion and cation exchange membranes respectively to a concentrate stream or streams leaving a dilute stream or streams reduced in concentration of acidic and basic components, and steam stripping the concentrate stream to remove the volatile acidic component and the volatile basic component.
Dependencies are inferred from the claim text.