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US 8,540,804 B2Granted
Sour gas and acid natural gas separation membrane process by pre removal of dissolved elemental sulfur for plugging prevention
AssigneeSaudi Arabian Oil Company
InventorsMilind M. Vaidya, Jean-Pierre R. Ballaguet, Sebastien A. Duval, Anwar H. Khawajah
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Abstract
Methods for removing sulfur from a gas stream prior to sending the gas stream to a gas separation membrane system are provided. Two schemes are available. When the sulfur content is high or flow is relatively high, a scheme including two columns where one tower is regenerated if the sulfur concentration exceeds a preset value can be used. When the sulfur content is low or flow is relatively low, a scheme including one column and an absorption bed.
Claims9
A method of removing sulfur from a gas stream comprising the steps of:
- a. contacting the gas stream with a solvent to selectively absorb at least a portion of elemental sulfur from the gas stream such that the gas stream has a sulfur concentration that is substantially less than prior to the gas stream being contacted with the solvent;
- b. filtering entrained liquid droplets from the gas stream so that sulfur does not become deposited on a gas separation membrane;
- and
- c. passing the gas stream through the gas separation membrane.
1 more element
Dependencies are inferred from the claim text.