Separation of carbon dioxide from ammonia

• US 2,992,703 A
• Filed: 06/05/1958
• Issued: 07/18/1961
• Est. Priority Date: 06/05/1958
• Status: Expired due to Term

• Current Assignee: Lucien H. Cook, Srini Vasan
• Original Assignee: Lucien H. Cook, Srini Vasan
• Inventors: SRINI VASAN, Cook, Lucien H.
• Application Number:
  US03/739,997
• Time in Patent Office: 1,139 Days
• US Class Current: 95/93
• CPC Class Codes: C01B 32/50 Carbon dioxide
• CPC Class Codes: C01C 1/12 Separation of ammonia from gases and vapours as part of the ammonia synthesis process C01C1/04
• CPC Class Codes: Y10S 95/902 Molecular sieve

Claims

1. THE METHOD OF REMOVING CARBON DIOXIDE FROM A MIXTURE OF AMMONIA AND CARBON DIOXIDE IN WHICH THE CARBON DIOXIDE IS PRESENT THEREIN IN AN AMOUNT IN EXCESS OF 2 PARTS PER MILLION BY VOLUME BUT NOT GREATER THAN 5/ PARTS PER MILLION BY VOLUME, WHICH COMPRISES PASSING SAID GAS MIXTURE THROUGH A MOLECULAR SIEVE COMPRISING A BED OF ACTIVATED ZEOLITE HAVING VOIDS WHOSE NARROWEST DIMENSION IS AT LEAST 4 ANGSTROM UNITS IN LENGTH TO PREFERENTIALLY ADSORB THE CARBON DIOXIDE, CONTINUING ADSORPTION UNTIL THE CARBON DIOXIDE, CONTINUING ADSORPTION UNHEATING THE ZEOLITE BED BY INDIRECT HEATING MEANS IN ADDITION TO A COUNTERCURRENT FLOW OF A PORTION OF THE PURIFIED AMMONIA WHICH HAS BEEN HEATED TO REGENERATE THE ZEOLITIC ADSORBENT BED, THEREAFTER COOLING THE ADSORBENT BED WITH A COOL CARBON DIOXIDE-FREE AMMONIA GAS.