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PROCESS FOR THE RECOVERY OF CARBON DIOXIDE FROM A GAS STREAM

  • US 20080159937A1
  • Filed: 12/28/2006
  • Published: 07/03/2008
  • Est. Priority Date: 12/28/2006
  • Status: Active Grant
First Claim
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1. A process for recovering CO2 from a feed gas stream comprising:

  • a. treating the feed gas stream with a regenerated absorbent having a viscosity less than 15 centistokes that is selected from one the of the following groups;

    i. at least one polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, the polyamine having at least one primary amine functionality having a pKa of <

    10.0 at 25°

    C. wherein and the feed gas stream has an SO2 concentration less than 5 ppm vol.; and

    ,ii. a polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, the polyamine having at least one secondary amine functionality having a pKa for each sorbing nitrogen of <

    10.0 at 25°

    C. 

    to obtain a spent absorbent and a CO2 lean gas stream;

    b. conveying the CO2 rich amine absorbent to a regeneration zone; and

    ,c. regenerating the absorbent.

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