Alkanolamine CO2 scrubbing process (ExxonMobil)

CATEGORY: CARBON CAPTURE
Alkanolamine CO2 scrubbing process (ExxonMobil)

Type	Patent
Inventor	Lisa S. Baugh
Inventor	Pavel Kortunov
URL	Free Full Text Source:  http://www.google.com/patents/US9034288
Assignee	Exxonmobil Research And Engineering Company
Patent Number	US9034288 B2
Issue Date	May 19, 2015
Abstract	A CO2 amine scrubbing process uses an absorbent mixture consisting of an alkanolamine CO2 sorbent in combination with a non-nucleophilic base. The alkanolamine has oxygen and nitrogen sites capable of nucleophilic attack at the CO2 carbon atom. The nucleophilic addition is promoted in the presence of the non-nucleophilic, relatively stronger base, acting as a proton acceptor. The non-nucleophilic base promoter, which may also act as a solvent for the alkanolamine, can promote reaction with the CO2 at each of the reactive hydroxyl and nucleophilic amine group(s) of the alkanolamines. In the case of primary amino alkanolamines the CO2 may be taken up by a double carboxylation reaction in which two moles of CO2 are taken up by the reacting primary amine groups.