Process for removing carbon dioxide containing acidic gases from gaseous mixtures using a basic salt activated with a hindered amine
First Claim
1. A composition comprising an aqueous solution which comprises (1) 10 to about 40 weight percent of an alkaline material selected from the group consisting of a basic alkali metal salt or alkali metal hydroxide, and (2) at least 2 weight percent of at least one sterically hindered amine, wherein said sterically hindered amine is defined as containing at least one secondary amino group attached to either a secondary or tertiary carbon atom or a primary amine group attached to a tertiary carbon atom and selected from the group consisting of:
- aminoethers, aminoalcohols, di- and triamines.
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Abstract
Carbon dioxide containing acidic gases are removed from a normally gaseous mixture by a process comprising contacting the normally gaseous mixture with an aqueous solution comprising (a) a basic alkali metal salt or hydroxide and (b) an activator for said basic salt or alkali metal salt or hydroxide comprising at least one sterically hindered amine.
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Citations
13 Claims
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1. A composition comprising an aqueous solution which comprises (1) 10 to about 40 weight percent of an alkaline material selected from the group consisting of a basic alkali metal salt or alkali metal hydroxide, and (2) at least 2 weight percent of at least one sterically hindered amine, wherein said sterically hindered amine is defined as containing at least one secondary amino group attached to either a secondary or tertiary carbon atom or a primary amine group attached to a tertiary carbon atom and selected from the group consisting of:
- aminoethers, aminoalcohols, di- and triamines.
- View Dependent Claims (2, 3, 4, 9, 10, 11, 12, 13)
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5. 2-dimethyl-diethylenetriamine;
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N1 -tert.butyl-1,2,3-triaminopropane; 2,2,5,5-tetramethyldiethylenetriamine; 1-amino-1-aminomethyl-2-hydroxymethylcyclohexane; N-hydroxyethyl-1,2-diaminocyclohexane; N-cyclohexyl-1,3-diamino-2-propanol; N-(2-hydroxycyclohexyl)-1,3-propanediamine; N-isopropanol-1,2-diaminocyclohexane; N-(2-hydroxybutyl)-1,4-diaminocyclohexane; N1 (1-hydroxy-2-butyl)-2-methyl-1,2-propanediamine; N(1-hydroxy-2-methyl-2-butyl)-1,3-propanediamine; N1 (1,1-dimethyl-2-hydroxyethyl)-2-methyl-1,2-propanediamine; N3 -isobutyl-2-methyl-2,3-diamino-1-propanol; N(3-hydroxy-2-butyl)-2,3-diaminobutane; N1 -hydroxyethyl-2-methyl-1,2-propanediamine; 2,N3,N3 -trimethyl-2,3-diamino-1-propanol; N1 2-dimethyl-N1 -hydroxyethyl-1,2-propanediamine; N(1,1-dimethyl-2-hydroxyethyl)-1,3-propanediamine; N-tert.butyl-1,3-diamino-2-propanol; 3-amino-3-methyl-2-pentanol; 1-hydroxymethyl-cyclopentylamine; 2,3-dimethyl-3-amino-1-butanol; 2-amino-2-ethyl-1-butanol; 1-methyl-2-hydroxycyclopentylamine; 2-amino-2-methyl-3-pentanol; 2,4-dimethyl-2-amino cyclohexanol; 1-hydroxyethyl cyclohexylamine; 1-hydroxymethyl-3-methyl cyclohexylamine; 2-hydroxy methyl-1-methyl-cyclohexylamine 2-amino-2-methyl-1-propanol 2-amino-2-methyl-1-butanol; 3-amino-3-methyl-1-butanol; 3-amino-3-methyl-2-butanol; 2-amino-2,3-dimethyl-3-butanol; 2-amino-2,3-dimethyl-1-butanol; 1-hydroxymethylcyclohexylamine; 2(2-amino-2-methylpropoxy)-ethanol; 2-piperidine methanol; 2-piperidine ethanol; 2-(1-hydroxyethyl)-piperidine; 5-hydroxy-2-methyl piperidine; 2-methyl-3-hydroxy piperidine; 2,6-dimethyl-3-hydroxy piperidine; 2,5-dimethyl-4-hydroxy piperidine; 2-tert.butylamino-methyl-1,4-dimethyl-piperazine; 1-tert.butylamino-3,6-dimethyl-3,6-diaza-cycloheptane.
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6. A composition comprising an aqueous solution which comprises:
- (1) 20 to about 30 weight percent potassium carbonate and (2) at least 2 weight percent of at least one sterically hindered amine selected from the group consisting of;
N-cyclohexyl-1,3-propanediamine;
1,8-p-menthanediamine;
1,7-bis-sec.butyl-diethylenetriamine;
2,2,5,5-tetramethyldiethylenetriamine;
3-amino-3-methyl-1-butanol;
2-amino-2-methyl-1-propanol;
N1 -isopropyl-2-methyl-1,2-propanediamine;
N1 -(1,1-dimethyl-2-hydroxyethyl)-2-methyl-1,2-propanediamine, and N1 -isopropyl-N2 -(3-aminopropyl)-2-methyl-1,2-propanediamine. - View Dependent Claims (8)
- (1) 20 to about 30 weight percent potassium carbonate and (2) at least 2 weight percent of at least one sterically hindered amine selected from the group consisting of;
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7. A composition comprising an aqueous solution which comprises:
- (a) 20 to about 30 weight percent potassium carbonate and (b) at least 2 weight percent of N-cyclohexyl-1,3-propanediamine.
Specification