Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Carbon dioxide or hydrogen sulfide component
Patent
1996-07-10
1998-12-29
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Carbon dioxide or hydrogen sulfide component
423229, 423232, 588250, B01D 5362
Patent
active
058536809
ABSTRACT:
This invention relates to a process for removing highly concentrated CO.sub.2 from high-pressure natural gas and recovering it in a high-pressure state.
This process comprises the absorption step of bringing high-pressure natural gas having a CO.sub.2 partial pressure of 2 kg/cm.sup.2 or greater and a pressure of 30 kg/cm.sup.2 or greater into gas-liquid contact with a regenerated CO.sub.2 -lean absorbing fluid comprising a CO.sub.2 absorbing fluid of which the difference in saturated CO.sub.2 absorption level between 40.degree. C. and 120.degree. C. is not less than 30 Nm.sup.3 per ton of solvent at a CO.sub.2 partial pressure of 2 kg/cm.sup.2, whereby highly concentrated CO.sub.2 present in the high-pressure natural gas is absorbed into the CO.sub.2 -lean absorbing fluid to produce refined natural gas having a reduced CO.sub.2 content and a CO.sub.2 -rich absorbing fluid; and the regeneration step of heating the CO.sub.2 -rich absorbing fluid without depressurizing it, whereby high-pressure CO.sub.2 having a pressure of 10 kg/cm.sup.2 or greater is liberated and a CO.sub.2 -lean absorbing fluid is regenerated and recycled for use in the absorption step.
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Iijima Masaki
Mitsuoka Shigeaki
DiMauro Peter
Mitsubishi Jukogyo Kabushiki Kaisha
Straub Gary P.
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