Removal of carbon dioxide from flue gases
First Claim
1. A process for removing carbon dioxide from a gas stream in which the partial pressure of the carbon dioxide in the gas stream is less than 200 mbar, the gas stream being contacted with a liquid absorption medium which comprises an aqueous solution of(A) a tertiary aliphatic alkanolamine and(B) an activator of the formula
R1—
- NH—
R2—
NH2,where R1 is C1-C6-alkyl and R2 is C2-C6-alkylene,the sum of the concentrations of A and B in the absorption medium being 2.5 to 7 mol/l and the molar ratio of B to A being in the range from 1;
3 to 1.5;
1.
2 Assignments
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Accused Products
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 formula
R1—NH—R2—NH2,
where R1 is C1-C6-alkyl and R2 is 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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Citations
20 Claims
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1. A process for removing carbon dioxide from a gas stream in which the partial pressure of the carbon dioxide in the gas stream is less than 200 mbar, the gas stream being contacted with a liquid absorption medium which comprises an aqueous solution of
(A) a tertiary aliphatic alkanolamine and (B) an activator of the formula
R1—- NH—
R2—
NH2,where R1 is C1-C6-alkyl and R2 is C2-C6-alkylene, the sum of the concentrations of A and B in the absorption medium being 2.5 to 7 mol/l and the molar ratio of B to A being in the range from 1;
3 to 1.5;
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- NH—
Specification