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Process for removal of carbon dioxide from industrial gases

  • US 4,440,731 A
  • Filed: 09/08/1981
  • Issued: 04/03/1984
  • Est. Priority Date: 09/08/1981
  • Status: Expired due to Term
First Claim
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1. In a process for removing carbon dioxide (CO2) from industrial combustion gases containing the CO2 and O2 contacting the gas, in a gas-liquid contactor, with an aqueous solution which contains an alkanol amine absorbent-reactant;

  • circulating the solution from the contactor to a regeneration step wherein the CO2 is released from the absorbent, the CO2 recovered and the essentially CO2 free absorbent recycled to the contactor, the improvement which consists of employing as the essential additives to said solution, to reduce degradation of the absorbent under the conditions of use and corrosion of the metals in contact with said solution during use, at least above 50 ppm of copper+2 and at least from 50 parts per million parts of solution one or more of the following;

    dihydroxyethylglycine, an alkali metal carbonate, an alkali metal or ammonium permanganate and nickel and/or bismuth oxides.

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