Process selection for deep COS removal from feed gas

A plan by Saudi Aramco to increase Saudi Arabia’s crude processing capacity includes grassroots facilities for processing approximately 2,500 MMsft3d of feed gas from various offshore fields. As part of this development, two NGL fractionation trains will be constructed to process propane plus (C3+) NGL feed streams and produce propane, butane and natural gasoline products that adhere to Saudi Aramco product specifications. At a later stage of the project, a higher content of carbonyl sulfide (COS) was found to be present in the feed gas. If left untreated, high COS in feed will cause the propane stream to fail product specification requirements. This article discusses Saudi Aramco’s methodi