PROCESSES AND SYSTEMS FOR REFINING FUEL GAS

摘要

Processes and systems are provided for refining fuel gas. The processes involve first and second water wash stages, before and after a caustic wash stage, in which fuel gas is contacted with water for removing amine and caustic compounds from the fuel gas. The systems for refining LPG comprise a first water wash vessel and a caustic wash vessel, followed by a second water wash vessel, wherein the water wash vessels are each adapted for contacting the LPG with water to remove amine and caustic compounds therefrom.

主权项

1. A process for refining fuel gas comprising:
providing a fuel gas comprising an amine compound; contacting the fuel gas with water in a first water wash stage to remove at least a portion of the amine compound therefrom and produce a washed fuel gas; contacting the washed fuel gas with either a caustic to remove acid gas or a blend of a caustic and an amine to remove both acid gas and carbonyl sulfide (COS) from the washed fuel gas and produce a caustic treated fuel gas comprising residual amine and residual caustic; and contacting the caustic treated fuel gas with water in a second water wash stage to remove residual amines and residual caustic therefrom and produce a rewashed fuel gas substantially free of amine and caustic.