Process for the removal of carbon dioxide from gases

Details Process for the removal of carbon dioxide from gases Process for the removal of carbon dioxide from gases

1996-08-06

1998-04-07

Langel, Wayne

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Carbon dioxide or hydrogen sulfide component

423229, C01B 3120

Patent

active

057361150

ABSTRACT:
This invention relates to a process for the removal of carbon dioxide from gases which comprises the carbon dioxide absorption step of bringing a gas having a carbon dioxide partial pressure in the range of 0.3 to 50 atmospheres (absolute pressure) into gas-liquid contact with an absorbing fluid comprising an aqueous solution containing an amine compound of the
where R.sup.1 and R.sup.2 independently represent lower alkyl groups of 1 to 3 carbon atoms, so as to produce a treated gas having a reduced carbon dioxide content and a carbon dioxide-rich absorbing fluid; and the regeneration step of liberating carbon dioxide from the carbon dioxide-rich absorbing fluid by (1) flashing at atmospheric pressure or in the vicinity of atmospheric pressure and/or (2) steam stripping, so that a carbon dioxide-lean absorbing fluid is regenerated and recycled for use in the carbon dioxide absorption step.
As compared with a conventional process using an aqueous solution of MDEA, the process of this invention has higher CO.sub.2 absorption capacity and is more advantageous from the viewpoint of energy efficiency in the regeneration of the absorbing fluid.

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