US4405581A — Process for the selective removal of hydrogen sul…

Claim 1

Independent Claim 67 words

A process for the selective absorption of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 comprising contacting normally gaseous mixture with an amino compound solution comprising a severely sterically hindered secondary amino alchol having a cumulative - E s value (Taft's steric hindrance constant) greater than about 1.75 under conditions whereby H 2 S is selectively absorbed from said mixture.

Claim 2

Dependent Claim 67 words

A process for the selective absorption of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 comprising contacting normally gaseous mixture with an amino compound solution comprising a severely sterically hindered secondary amino alchol having a cumulative - E s value (Taft's steric hindrance constant) greater than about 1.75 under conditions whereby H 2 S is selectively absorbed from said mixture.

Claim 3

Dependent Claim 18 words

The process of claim 1 wherein the absorbent solution further comprises water, a physical absorbent, or mixtures thereof.

Claim 4

Dependent Claim 28 words

The process of claim 2 wherein the total concentration of amino alcohol in the solution is in the range from about 0.1 to about 6 moles per liter.

Claim 5

Dependent Claim 28 words

The process of claim 2 wherein the total concentration of amino alcohol in the solution is in the range from about 1 to about 4 moles per liter.

Claim 6

Dependent Claim 15 words

The process of claim 1 wherein the absorbent solution is regenerated by heating and stripping.

Claim 7

Dependent Claim 57 words

The process of claim 5 wherein the contacting step is conducted at a temperature ranging from about 20° to 100° C. and at a pressure ranging from 5 to 200 psia, and the regeneration step is conducted at a temperature ranging from about 50° to 170° C. and at a pressure ranging from 1 to 50 psia.

Claim 8

Dependent Claim 57 words

The process of claim 5 wherein the contacting step is conducted at a temperature ranging from about 40° to 60° C. and at a pressure ranging from 20 to 1500 psia, and the regeneration step is conducted at a temperature ranging from about 80° to 120° C. and at a pressure ranging from 15 to 30 psia.

Claim 9

Dependent Claim 170 words

The process of claim 1 wherein the amino alchol is defined by the general formula: ##STR10## wherein R 1 is selected from the group consisting of primary alkyl or primary hydroxyalkyl radicals having 1-8 carbon atoms, branched chain alkyl, branched chain hydroxyalkyl, cycloalkyl and hydroxycycloalkyl radicals having 3 to 8 carbon atoms, and R 2 and R 3 are each independently selected from the group consisting of hydrogen, C 1 -C 4 alkyl and C 1 -C 4 hydroxyalkyl radicals, with the proviso that when R 1 is a primary alkyl or primary hydroxyalkyl radical, both R 2 and R 3 bonded to the carbon atom directly bonded to the nitrogen atom are alkyl or hydroxyalkyl radicals and when the carbon atom of R 1 directly bonded to the nitrogen atom is secondary, at least one of R 2 or R 3 bonded to the carbon atom directly bonded to the nitrogen atom is an alkyl or hydroxyalkyl radical, and x is a positive integer ranging from 2 to 4.

Claim 10

Dependent Claim 23 words

The process of claim 8 wherein the amino alcohol is selected from the group consisting of tertiarybutylaminoethanol, 2-(tertiarybutylamino)-1-propanol, 2-(isopropylamino)-1-propanol, 3-tertiarybutylamino)-n-butanol, 3-(tertiarybutylamino)-1-propanol and 3-aza-2,2-dimethyl-1,6-hexanediol.

Claim 11

Dependent Claim 26 words

The process of claims 1 or 8 wherein the solution additionally includes an additive selected from the group consisting of antifoaming agents, antioxidants, and corrosion inhibitors.

Claim 12

Dependent Claim 130 words

A process for the selective absorption of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 comprising: (a) contacting said normally gaseous mixture with an absorbent solution comprising an amino alcohol selected from the group consisting of tertiarybutylaminoethanol, 2-(tertiarybutylamino)-1-propanol, 2-(isopropylamino)-1-propanol, 3-(tertiarybutylamino)-n-butanol, 3-(tertiarybutylamino)-1-propanol, and 3-aza-2,2-dimethyl1,6-hexanediol, at a temperature of from 20° to 100° C. and a pressure of from 5 to 2000 psia, whereby H 2 S is selectively absorbed from said mixture; (b) heating said absorbent solution containing H 2 S at a temperature of from 50° 170° at a pressure of from 1 to 50 psia, to at least partially regenerate said solution; and (c) recycling the regenerated solution for the selective absorption of H 2 S by contacting as in step (a).

Claim 13

Dependent Claim 130 words

A process for the selective absorption of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 comprising: (a) contacting said normally gaseous mixture with an absorbent solution comprising an amino alcohol selected from the group consisting of tertiarybutylaminoethanol, 2-(tertiarybutylamino)-1-propanol, 2-(isopropylamino)-1-propanol, 3-(tertiarybutylamino)-n-butanol, 3-(tertiarybutylamino)-1-propanol, and 3-aza-2,2-dimethyl1,6-hexanediol, at a temperature of from 20° to 100° C. and a pressure of from 5 to 2000 psia, whereby H 2 S is selectively absorbed from said mixture; (b) heating said absorbent solution containing H 2 S at a temperature of from 50° 170° at a pressure of from 1 to 50 psia, to at least partially regenerate said solution; and (c) recycling the regenerated solution for the selective absorption of H 2 S by contacting as in step (a).

Claim 14

Dependent Claim 18 words

The process of claim 11 wherein the absorbent solution further comprises water, a physical absorbent, or mixtures thereof.

Claim 15

Dependent Claim 31 words

The process of claim 12 wherein the absorbent solution is an aqueous solution with a concentration of amino compound in the range from about 0.1 to about 6 moles per liter.

Claim 16

Dependent Claim 24 words

The process of claim 11 wherein the solution additionally includes an additive selected from the group consisting of antifoaming agents, antioxidants, and corrosion inhibitors.

Claim 17

Dependent Claim 64 words

A scrubbing solution for selective absorption of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 comprising: (a) an amino alcohol comprising a severely sterically hindered secondary amino alcohol having a cumulative - E s value (Taft's steric hindrance constant) greater than about 1.75; and (b) a solvent which solubilizes the amino compound and is a physical absorbent.

Claim 18

Dependent Claim 64 words

A scrubbing solution for selective absorption of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 comprising: (a) an amino alcohol comprising a severely sterically hindered secondary amino alcohol having a cumulative - E s value (Taft's steric hindrance constant) greater than about 1.75; and (b) a solvent which solubilizes the amino compound and is a physical absorbent.

Claim 19

Dependent Claim 17 words

The solution of claim 15 wherein the amino alcohol is tertiarbutylaminoethanol and the physical absorbent is sulfolane.

Claim 20

Dependent Claim 9 words

The solution of claim 15 which additionally contains water.

Claim 21

Dependent Claim 27 words

The solution of claims 15, 16 or 17 wherein the concentration of the amino alcohol ranges from about 0.1 to 6 moles per liter of total solution.

Claim 22

Dependent Claim 26 words

The solution of claims 15, 16 or 17 wherein the concentration of the amino alcohol ranges from 1 to 4 moles per liter of total solution.

Claim 23

Dependent Claim 28 words

The solution of claim 17 wherein the concentration of the solvent which is a physical absorbent ranges from about 0.1 to 5 moles per liter of total solution.

Claim 24

Dependent Claim 74 words

A process for the selective absorption of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 comprising contacting said normally gaseous mixture with an absorbent solution comprising a mixture of a severely sterically hindered secondary amino alcohol having a cumulative - E s value (Taft's steric hindrance constant) greater than about 1.75 and another amino compound, under conditions whereby H 2 S is selectively absorbed from said mixture.

Claim 25

Dependent Claim 74 words

A process for the selective absorption of H 2 S from a normally gaseous mixture containing H 2 S and CO 2 comprising contacting said normally gaseous mixture with an absorbent solution comprising a mixture of a severely sterically hindered secondary amino alcohol having a cumulative - E s value (Taft's steric hindrance constant) greater than about 1.75 and another amino compound, under conditions whereby H 2 S is selectively absorbed from said mixture.

Claim 26

Dependent Claim 12 words

The process of claim 21 wherein said other amino compound is methyldiethanolamine.

Claim 27

Dependent Claim 45 words

A process for removing H 2 S from normally gaseous streams containing same comprising contacting said gaseous stream with an absorbent solution comprising a severely sterically hindered secondary amino alcohol having a cumultive - E s value (Taft's steric hindrance constant) greater than about 1.75.

Claim 28

Dependent Claim 45 words

A process for removing H 2 S from normally gaseous streams containing same comprising contacting said gaseous stream with an absorbent solution comprising a severely sterically hindered secondary amino alcohol having a cumultive - E s value (Taft's steric hindrance constant) greater than about 1.75.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1986-09-19	1987-03-21	1987-09-20	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1990-09-19	1991-03-21	1991-09-20	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1994-09-19	1995-03-21	1995-09-20	$7700.00	Window Closed / Lapsed

Process for the selective removal of hydrogen sulfide from gaseous mixtures with severely sterically hindered secondary amino compounds

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag