B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
23/356
B01D 53/00 (2006.01) B01D 53/14 (2006.01)
Patent
CA 1091429
ABSTRACT A process for the substantial removal of carbon dioxide from a normally gaseous mixture containing the same, which comprises: (a) in an absorption step, contacting said normally gaseous mixture with an aqueous absorbing solution containing from about 5 to about 65 weight percent of at least one mildly sterically hindered water-soluble primary monoamine defined as having a secondary carbon atom attached to the amino group to absorb the carbon dioxide in said aqueous absorbing solution, wherein the absorption step is conducted at temperatures in the range from about 20° to about 100°C and the partial pressure of the carbon dioxide in the feed gas is in the range from about 1 to about 1000 psia; and (b) in a regeneration step, desorbing absorbed carbon dioxide from said absorbing solution at temperatures in the range from about 50° to about 170°C and at pressures ranging from about 1 to about 50 psia until at least more carbon dioxide is desorbed from the absorbing solution than would be desorbed from an absorbing solution containing the same amount of mono- ethanolamine under the same conditions of regeneration. Aqueous solutions containing water-soluble primary monoamines having a secondary carbon atom attached to the amino group provide the same high cleanup and fast absorption rates as aqueous solutions containing monoethanolamine, with the advantages of slightly higher capacity and much easier regeneration than the monoethanolamine solutions.
292708
Sartori Guido
Savage David W.
Borden Ladner Gervais Llp
Exxon Research And Engineering Company
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