Removal of gases from a feed
AssigneeConocoPhillips Company
InventorJoe D. Allison
Life of this patent
Estimating the term…
Abstract
A process is presented for separating and removing acid gases or base gases from a feed gas by use of a gas permeable membrane and a permeate comprising a treatment solution. The treatment solution in the permeate is caustic or acidic and reacts with the base or acid gases respectively to form salts so as to facilitate their removal from the feed gas. The acid gas in an acid feed gas may include HCN, H2S, CO2, COS and/or NOx. The base gas in a base feed gas may include NH3. In another aspect of the present invention, an apparatus for treating a feed gas containing an acid or a base gas comprises a feed gas passage; a treatment solution container containing a treatment solution; and a gas permeable membrane.
Claims58
A process for treating an acid feed gas, comprising:
- bringing the acid feed gas into contact with a gas permeable membrane;
- said gas permeable membrane being in simultaneous contact with a permeate comprising a caustic solution in such a manner as to allow for the permeation of gases between said acid feed gas and said permeate, wherein the acid feed gas and the permeate are on opposite sides of the gas permeable membrane;
- wherein at least one acid gas is at least 50% removed from said acid feed gas by permeation of said acid gas through said gas permeable membrane and reaction of said acid gas with the caustic of said caustic solution of said permeate on the permeate side of the gas permeable membrane;
- and wherein said reaction produces a salt.
A process for treating a base feed gas, comprising:
- bringing the base feed gas into contact with a gas permeable membrane;
- said gas permeable membrane being in simultaneous contact with a permeate comprising an acidic solution in such a manner as to allow for the permeation of gases between said base feed gas and said permeate, wherein the base feed gas and the permeate are on opposite sides of the gas permeable membrane;
- wherein at least one base gas is at least 50% removed from said base feed gas by permeation of said base gas through said gas permeable membrane and reaction of said base gas with the acid of said acidic solution of said permeate on the permeate side of the gas permeable membrane;
- and wherein said reaction produces a salt.
Dependencies are inferred from the claim text.