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Configurations and methods of high pressure acid gas removal in the production of ultra-low sulfur gas

  • US 9,776,124 B2
  • Filed: 03/04/2016
  • Issued: 10/03/2017
  • Est. Priority Date: 02/17/2010
  • Status: Active Grant
First Claim
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1. A method of treating a rich physical solvent, comprising:

  • producing the rich solvent in an absorber, wherein the absorber receives a feed gas and produces a treated gas;

    flashing the rich solvent in multiple successive stages from a first pressure to a second pressure to generate a hydrocarbon-containing flash gas and a flashed solvent, wherein flashing the rich solvent in the multiple successive stages occurs in a plurality of flash vessels, wherein the rich solvent passes through the multiple successive stages in series;

    heating and further flashing the flashed solvent from the second pressure to a third pressure to generate a CO2-containing flash gas and a lean solvent; and

    stripping a first portion of the lean solvent in a stripping column using a portion of the treated gas as a stripping gas to produce a stripping column overhead product and an ultra-lean solvent; and

    feeding a second portion of the lean solvent and the ultra-lean solvent into the absorber at different positions.

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