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Process for removing acid gases using a basic salt activated with a non-sterically hindered diamine

  • US 4,376,101 A
  • Filed: 11/13/1981
  • Issued: 03/08/1983
  • Est. Priority Date: 11/13/1981
  • Status: Expired due to Fees
First Claim
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1. A process for the removal of CO2 from a gaseous stream containing CO2 which comprises (1) in an absorption step, absorbing CO2 from said gaseous stream with an aqueous absorbing solution comprising (a) a basic alkali metal salt or hydroxide selected from the group consisting of alkali metal bicarbonates, carbonates, hydroxides, borates, phosphates and their mixtures, and (b) an activator or promoter system for said basic alkali metal salt or hydroxide comprising (i) at least one non-sterically hindered diamine which is defined as a compound containing both a primary and a tertiary amino moiety wherein the primary amino moiety is attached to a primary carbon atom, and (ii) an amino acid which has the capability to increase the solubility of said diamines in alkaline aqueous conditions at elevated temperatures, and (2) in a desorption and regeneration step desorbing at least a portion of the absorbed CO2 from said absorbing solution.

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