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Method and compositions for removing acid gases from gaseous mixtures and reducing corrosion of ferrous surface areas in gas purification systems

  • US 3,896,212 A
  • Filed: 09/17/1973
  • Issued: 07/22/1975
  • Est. Priority Date: 02/01/1966
  • Status: Expired due to Term
First Claim
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1. IN AN ABSORPORTION-DESORPTION PROCESS FOR REMOVING CARBON DIOXIDE FROM A GASOUS MIXTURE CONTAINING SUBSTANTIALLY NO OXYGEN OR HYDROGEN SULFIDE, WHEREIN SAID MIXTURE IS CONTRACTED WITH AN AQUOUS OBSORPTION SOLUTION COMPRISING AT LEAST POTASSIUM SALT SELECTED FROM THE GROUP CONSISTNG OF POTASSIUM CARBONATE, POTASSIUM BORATE AND MIXTURES THEREOF, SAID SOLUTION THEREAFTER BEING REGENERATED BY REMOVING AT LEAST A PORTION OF THE ABSORBED CARBON DIOXIDE AND THENCE RECYCLED FOR FURTHER ABSORPTIVE CONTACT WITH SAID GASEOUS MIXTURE, THE IMPROVEMENT WHICH COMPRISES:

  • ADDING A SMALL AMOUNT OF A CORROSION INHIBITOR SELECTED FROM THE GROUP CONSISTING OF THE SODIUM, POTASSIUM AND AMMONIUM METAVANDATES AND POXYVANADATES TO SAID AQUEOUS ABSORPTION SOLUTION, AND CONTACTING SAID ABSORPTION SOLUTION WITH A SMALL AMOUNT OF AN OXIDIZING AGENT SELECTED FROM THE GROUP CONSISTING OF AIR, OXYGEN HYDROGEN PEROXIDE AND THE ALKALI METALS DICHROMATES, SAID OXIDIZING AGENT BEING PRESENT IN AN AMOUNT SUFFECIENT TO MAINTAIN MOST OF SAID CORROSION INHIBITOR IN AN OXIDIZED CONDITION.

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