×

Selective Removal and Recovery of Acid Gases from Gasification Products

  • US 20090220406A1
  • Filed: 02/27/2009
  • Published: 09/03/2009
  • Est. Priority Date: 02/29/2008
  • Status: Abandoned Application
First Claim
Patent Images

1. A process for removing hydrogen sulfide and carbon dioxide from a gas mixture, the process comprising the steps of:

  • (A) providing a gas mixture comprising methane, carbon monoxide, hydrogen, hydrogen sulfide, and carbon dioxide;

    (B) contacting the gas mixture with a first absorber under a first set of operating conditions to produce a hydrogen sulfide-depleted gas stream and a hydrogen sulfide-laden absorber stream, the hydrogen sulfide-depleted gas stream comprising about 5 ppm or less hydrogen sulfide;

    (C) recovering the hydrogen sulfide-laden absorber stream;

    (D) contacting the hydrogen sulfide-depleted gas stream with a second absorber under a second set of operating conditions to produce a carbon dioxide-depleted gas stream and a carbon dioxide-laden absorber stream, the carbon dioxide-depleted gas stream comprising about 50 ppm or less of carbon dioxide; and

    (E) recovering the carbon dioxide-laden absorber stream;

    wherein;

    the first operating conditions comprise a first operating temperature and a first operating pressure,the second operating conditions comprise a second operating temperature and a second operating pressure,the first operating temperature is greater than the second operating temperature, andthe first and second absorbers substantially comprise methanol.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×