Process and amine-solvent absorbent for removing acidic gases from gaseous mixtures
First Claim
1. An amine-solvent liquid composition, comprising:
- (a) an amine mixture comprised of at least 50 mol % of a sterically hindered amine and at least about 10 mol % of a tertiary amino alcohol, wherein said sterically hindered amine 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) a nonreactive solvent for said amine mixture, said solvent being a member selected from the group consisting of sulfones;
sulfoxides;
glycols, mono- and diethers thereof;
1,3-dioxo compounds characterized by being a 5- to 6-membered heterocyclic ring;
aromatic ethers;
aromatic hydrocarbons;
pryyolidones;
piperidones; and
mixtures thereof.
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Accused Products
Abstract
Acidic gases are substantially removed from a normally gaseous mixture by a process comprising contacting the normally gaseous mixture with an amine-solvent liquid absorbent comprising (i) an amine mixture comprised of at least about 50 mol % of a sterically hindered amine and at least about 10 mol % of a tertiary amino alcohol, wherein said sterically hindered amine 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 (ii) a solvent for said amine mixture which is also a physical absorbent for said acidic gases. The liquid absorbent may also include up to about 35 weight percent water. The coaction of the sterically hindered amine and the tertiary amino alcohol in conjunction with the solvent provides an increase in the amount of CO2 containing acidic gases absorbed compared to the use of the same sterically hindered amines alone and lowers the heat of reaction.
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Citations
15 Claims
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1. An amine-solvent liquid composition, comprising:
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(a) an amine mixture comprised of at least 50 mol % of a sterically hindered amine and at least about 10 mol % of a tertiary amino alcohol, wherein said sterically hindered amine 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) a nonreactive solvent for said amine mixture, said solvent being a member selected from the group consisting of sulfones;
sulfoxides;
glycols, mono- and diethers thereof;
1,3-dioxo compounds characterized by being a 5- to 6-membered heterocyclic ring;
aromatic ethers;
aromatic hydrocarbons;
pryyolidones;
piperidones; and
mixtures thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 13)
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8. An amine-solvent liquid absorbent composition comprising:
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(a) an amine mixture comprised of at least 50 mol % of a sterically hindered amine and at least 10 mol % of a tertiary amino alcohol, wherein said sterically hindered amine is a member selected from the group consisting of 2-piperidine methanol and 2-piperidine ethanol and said tertiary amino alcohol is a member selected from the group consisting of 3-dimethylamino-1-propanol, 1-diethylamino-2-propanol and 2-diethylamino ethanol; and (b) a nonreactive solvent for said amine mixture, said solvent being a cyclotetramethylene sulfone. - View Dependent Claims (9, 10, 11, 14)
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12. An amine-solvent liquid absorbent composition comprising:
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(a) an amine mixture comprised of at least about 65 mol % of 2-piperidine ethanol and 20 to about 35 mol % of a tertiary amino alcohol selected from the group consisting of 3-dimethylamino-1-propanol, 1-diethylamino-2-propanol and 2-diethylamino ethanol, wherein the total amine concentration in said liquid absorbent is in the range from about 10 weight % to about 65 weight %; (b) water, in an amount ranging from about 10 to about 20 weight %; and (c) essentially all of the balance being sulfolane. - View Dependent Claims (15)
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Specification