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Method and apparatus for separating gases

  • US 8,518,155 B2
  • Filed: 03/16/2007
  • Issued: 08/27/2013
  • Est. Priority Date: 03/16/2007
  • Status: Active Grant
First Claim
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1. A method of removing a gas dissolved in a liquid under pressure, said method comprising:

  • combining a gas comprising at least one acidic gas with a liquid under pressure in order to form a pressurized liquid having at least one acidic gas dissolved therein;

    wherein the pressurized liquid comprises a solvent and the solvent preferentially absorbs the at least one acidic gas,reducing the pressure on said liquid at a first expansion ratio, a first portion of said gas being thereby released from said liquid;

    drawing off said first portion of said gas from said liquid;

    reducing the pressure on said liquid at a second expansion ratio greater than said first expansion ratio, a second portion of said gas being thereby released from said liquid;

    drawing off said second portion of said gas from said liquid; and

    reducing the pressure on said liquid at a third expansion ratio greater than said second expansion ratio, a third portion of said gas being thereby released from said liquid;

    and wherein expansion ratio Rn is defined as Pn-1/Pn and Pn-1 is the absolute pressure of the gas at a preceding stage and Pn is the absolute pressure of the gas at a subsequent stage n.

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