METHOD FOR REMOVING ACID GASES FROM GASEOUS MIXTURES

• US 3,851,041 A
• Filed: 03/15/1971
• Issued: 11/26/1974
• Est. Priority Date: 02/01/1966
• Status: Expired due to Term

• Current Assignee: Eickmeyer & Associates Incorporated
• Original Assignee: Eickmeyer A
• Inventors: EICKMEYER A
• Application Number:
  US05/124,251
• Time in Patent Office: 1,352 Days
• US Class Current: 423/223
• CPC Class Codes: B01D 53/1406 Multiple stage absorption
• CPC Class Codes: B01D 53/1412 Controlling the absorption process
• CPC Class Codes: B01D 53/1456 Removing acid components
• CPC Class Codes: B01D 53/1462 Removing mixtures of hydrogen sulfide and carbon dioxide
• CPC Class Codes: B01D 53/1468 Removing hydrogen sulfide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/526 Mixtures of hydrogen sulfide and carbon dioxide
• CPC Class Codes: C10K 1/10 with aqueous liquids alkaline reacting aqueous liquids C10K1/12
• CPC Class Codes: C23F 11/06 in markedly alkaline liquids
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

1. AN ABSORPTION-DESORPTION PROCESS FOR SELECTIVELY REMOVING CO2 OR H2S FROM A GASEOUS MIXTURE CONTAINING THE SAME IN COMBINATION WITH OTHER GASES, COMPRISING THE STEPS OF: CONTACTING SAID GASEOUS MIXTURE WITH A HOT AQUEOUS SOLUTION COMPRISING FROMA BOUT 15 TO ABOUT 40 W4EEIGHT PERCENT OF A POTSSASSIUM SALT SELECTED FROM THE GROUP CONSISTIBG OF POTASSIUM CARBONATE, POTASSIUM BORATE, AND MIXTURES THEREOF, AND A SMALLER AMOUNT WITHIN THE RANGE OF FROM ABOUT 2.0 TO 16.7% BY WEIGHT OF AN AMINE BORATE CHOSEN FROM THE FROUP CONSISTING OF MONOETHANOLAMINE BORATE, DIETHANOLAMINE BORATE, AN ETHYLENE POLYAMINE BORATE, AND A BORATE OF THE REACTION PRODUCT OF AN ETHYLENE POLYAMINE AND ETHYLENE OXIDE, IN AN ABSORPTION STAGE TO THEREBY CATALYZE THE ABSORPTION OF AT LEAST A PORTION OF THE CO3 OR H2S FROM SAID GASEOUS MIXTURE; MAINTAINING SAID HOT SOLUTION AT AN ELEVATED TEMPERATURE OF AT LEAST ABOUT 56*C.; REGENERATING THE HOT AQUEOUS SOLUTION CONTAINING THE ABSORBED CO2 OR H2S IN A REGENERATING STAGE BY STEAM STRIPPING AT LEAST A PORTION THEREOF FROM THE SOLUTION; AND RECYCLING AT LEAST A PORTION OF SAID REGENERATED SOLUTION FOR ABSORPTIVE CONTACT WITH SAID GASEOUS MIXTURE WHILE MAINTAINING SAID SOLUTION AT A TEMPERATURE OF AT LEAST SAID LEVEL OF 56*C.

Claims

1. AN ABSORPTION-DESORPTION PROCESS FOR SELECTIVELY REMOVING CO2 OR H2S FROM A GASEOUS MIXTURE CONTAINING THE SAME IN COMBINATION WITH OTHER GASES, COMPRISING THE STEPS OF:

CONTACTING SAID GASEOUS MIXTURE WITH A HOT AQUEOUS SOLUTION COMPRISING FROMA BOUT 15 TO ABOUT 40 W4EEIGHT PERCENT OF A POTSSASSIUM SALT SELECTED FROM THE GROUP CONSISTIBG OF POTASSIUM CARBONATE, POTASSIUM BORATE, AND MIXTURES THEREOF, AND A SMALLER AMOUNT WITHIN THE RANGE OF FROM ABOUT 2.0 TO 16.7% BY WEIGHT OF AN AMINE BORATE CHOSEN FROM THE FROUP CONSISTING OF MONOETHANOLAMINE BORATE, DIETHANOLAMINE BORATE, AN ETHYLENE POLYAMINE BORATE, AND A BORATE OF THE REACTION PRODUCT OF AN ETHYLENE POLYAMINE AND ETHYLENE OXIDE, IN AN ABSORPTION STAGE TO THEREBY CATALYZE THE ABSORPTION OF AT LEAST A PORTION OF THE CO3 OR H2S FROM SAID GASEOUS MIXTURE;

MAINTAINING SAID HOT SOLUTION AT AN ELEVATED TEMPERATURE OF AT LEAST ABOUT 56*C.;

REGENERATING THE HOT AQUEOUS SOLUTION CONTAINING THE ABSORBED CO2 OR H2S IN A REGENERATING STAGE BY STEAM STRIPPING AT LEAST A PORTION THEREOF FROM THE SOLUTION;

AND RECYCLING AT LEAST A PORTION OF SAID REGENERATED SOLUTION FOR ABSORPTIVE CONTACT WITH SAID GASEOUS MIXTURE WHILE MAINTAINING SAID SOLUTION AT A TEMPERATURE OF AT LEAST SAID LEVEL OF 56*C.