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Process and system for cleaning a gas stream

  • US 9,028,784 B2
  • Filed: 02/15/2011
  • Issued: 05/12/2015
  • Est. Priority Date: 02/15/2011
  • Status: Active Grant
First Claim
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1. A process for cleaning a gas stream containing carbon dioxide, comprising:

  • a) removing, in a at least a first gas-liquid contacting device, a part of the carbon dioxide contained in the gas stream by bringing the gas stream into contact with a first ammoniated liquid, to form a liquid enriched in carbon dioxide and a gas stream partly depleted in carbon dioxide;

    b) removing, in a CO2 removal vessel, at least a part of, the carbon dioxide contained in the gas stream partly depleted in carbon dioxide by bringing the gas stream partly depleted in carbon dioxide leaving step a) into contact with at least a second ammoniated liquid, to form a carbon dioxide depleted gas stream enriched in ammonia; and

    c) removing, in at least a second gas-liquid contacting device, at least a part of, the ammonia of the carbon dioxide depleted gas stream enriched in ammonia by bringing the carbon dioxide depleted gas stream enriched in ammonia leaving step b) into contact with the liquid enriched in carbon dioxide formed in step a), to absorb, into the liquid, ammonia from the gas stream, such that a carbon dioxide depleted gas stream at least partly depleted in ammonia and a liquid enriched in ammonia are formed, wherein the liquid enriched in ammonia is the first ammoniated liquid used in step a);

    d) contacting, in the second gas-liquid contacting device, the carbon dioxide depleted gas stream at least partly depleted in ammonia prior with a heated liquid to form a heated gas stream; and

    e) releasing the heated as stream to the atmosphere.

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