Process and composition for removing carbon dioxide containing acidic gases from gaseous mixtures
First Claim
1. An amine composition comprising an aqueous mixture of:
- (a) at least about 50 mol % of a sterically hindered amino alcohol wherein the sterically hindered amino alcohol contains at least one secondary amino group which is part of a ring and is attached to either a secondary or tertiary carbon atom or a primary amino group attached to a tertiary carbon atom, and(b) at least about 10 mol % of a tertiary amino alcohol.
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Abstract
Carbon dioxide containing acidic gases are substantially removed from a normally gaseous mixture by a process comprising contacting the normally gaseous mixture with an aqueous amine solution, wherein the amine consists of at least about 50 mol % of a sterically hindered amino alcohol and at least about 10 mol % of a tertiary amino alcohol, wherein said sterically hindered amino alcohol contains at least one secondary amino group which is part of a ring and is attached to either a secondary or tertiary carbon atom or a primary amino group attached to a tertiary carbon atom. The coaction of the sterically hindered amino alcohol and the tertiary amino alcohol provide an increase in the amount of carbon dioxide containing acidic gases absorbed compared to the use of the sterically hindered amines alone and lowers the heat of reaction.
15 Citations
10 Claims
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1. An amine composition comprising an aqueous mixture of:
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(a) at least about 50 mol % of a sterically hindered amino alcohol wherein the sterically hindered amino alcohol contains at least one secondary amino group which is part of a ring and is attached to either a secondary or tertiary carbon atom or a primary amino group attached to a tertiary carbon atom, and (b) at least about 10 mol % of a tertiary amino alcohol. - View Dependent Claims (2, 3, 4, 5, 6)
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- 7. An amine composition comprising an aqueous mixture of (a) at least about 50 mol % of 2-amino-2-methyl-1-propanol, and (b) at least about 10 mol % of a tertiary amino alcohol selected from the group consisting of N-methyl diethanolamine, 2-dimethylamino ethanol, 3-dimethylamino-1-propanol and 1-dimethylamino-2-propanol.
Specification