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Sour gas and acid natural gas separation membrane process by pre removal of dissolved elemental sulfur for plugging prevention

  • US 8,696,791 B2
  • Filed: 08/26/2013
  • Issued: 04/15/2014
  • Est. Priority Date: 11/01/2010
  • Status: Active Grant
First Claim
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1. 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;

    b. filtering entrained liquid droplets from the gas stream so that sulfur does not become deposited on a gas separation membrane;

    c. passing the gas stream through the gas separation membrane;

    d. analyzing a sulfur concentration of an overhead stream of the solvent scrubber and sending the gas stream to a second column if the sulfur concentration exceeds a sulfur solubility estimated in retentate and permeate flows by a membrane separation process simulation; and

    e. regenerating the solvent by sending a gas capable of dissolving sulfur through the solvent scrubber.

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