Removal of carbon dioxide from flue gases

Details Removal of carbon dioxide from flue gases Removal of carbon dioxide from flue gases

2011-02-15

2011-02-15

Smith, Duane (Department: 1797)

Gas separation: processes

Liquid contacting

Inorganic gas, liquid particle, or solid particle sorbed

C423S228000

Reexamination Certificate

active

07887620

ABSTRACT:
A description is given of a process for removing carbon dioxide from gas streams in which the partial pressure of the carbon dioxide is less than 200 mbar, in particular flue gases, the gas stream being contacted with a liquid absorption medium which comprises an aqueous solution (A) of a tertiary aliphatic alkanolamine and (B) an activator of the formulain-line-formulae description="In-line Formulae" end="lead"?R1—NH—R2—NH2,in-line-formulae description="In-line Formulae" end="tail"?where R1is C1-C6-alkyl and R2is C2-C6-alkylene, the sum of the concentrations of A and B being 2.5 to 7 mol/l, and the molar ratio of B to A being in the range of 1:3 to 1.5:1. The activator is, for example, 3-methylaminopropylamine, the tertiary aliphatic amine methyldiethanolamine, methyldiisopropanolamine or n-butyldiethanolamine. The process permits substantial removal of carbon dioxide and the regeneration of the absorption medium is possible with relatively low energy consumption.

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English-language translation of the International Preliminary Report on Patentability (IPER) for international application PCT/EP2007/055820 mailed Feb. 12, 2009.
N. Asprion “Nonequillbrium Rate-Based Simulation of Reactive Systems: Simulation Model Heat Transfer, and Influence of Film Discretization,” Ind. Eng. Chem. Res. 2006, 45, 2045-2069, published on Web Feb. 8, 2006.

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