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US4525294A Expired / Lapsed US ⏱️ 0.0 years remaining

Amino acid mixtures, their alkali metal salts and process for preparing same

Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1983-04-14
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Granted: 1985-06-25
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Expires: 2003-04-14
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Abstract

Abstract The present invention relates to the preparation of mixtures of sterically hindered substituted N-secondary amino acids or their alkali metal salts by a one-step reductive condensation of an amino acid or its alkali metal salt containing a primary amino group and a ketone to thereby form a mono-substituted amino acid or alkali metal salt thereof, followed by preparing the corresponding sterically hindered tertiary amino acids or alkali metal salt thereof by reacting the mono-substituted amino acids or alkali metal salt thereof with an unhindered aldehyde under reducing conditions in the presence of a hydrogenating catalyst. The novel mixtures of the sterically hindered mono-substituted amino acids and the tertiary amino acids and their alkali metal salts are useful promoters for alkaline salts in "hot pot" acid gas scrubbing processes.

Inventors

  • 👤 Guido Sartori
  • 👤 Warren A. Thaler

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 04:49
CPC Classifications
C; C09; C09K; C09K3/00; H; H05; H05B; H05B33/00

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 182 words
A composition comprising a mixture of amino acids and alkali metal salts thereof comprising amino acids and salts represented by the formulae: ##STR7## wherein R is hydrogen or methyl, X is hydrogen or an alkali metal and R' and R" are each selected from the group consisting of: (a) substituted or unsubstituted, linear or branched, alkyl radicals having one to twenty carbon atoms; (b) substituted or unsubstituted alkylene radicals each having three to six carbon atoms and R' and R" together forming a cyclic ring; (c) substituted or unsubstituted cycloalkyl radicals having from four to eight ring carbon atoms; (d) substituted or unsubstituted, hydroxy-alkyl radicals, linear or branched, having from one to twenty carbon atoms; (e) substituted or unsubstituted aralkyl radicals having from seven to twenty carbon atoms, and wherein R'" is selected from the group consisting of substituted or unsubstituted linear alkyl radicals having from one to twenty carbon atoms; and wherein the substituent group of (a) thru (e) above, are selected from the group consisting of hydroxyl groups, ether linkages, silane groups, and heterocyclic rings containing oxygen in their rings.
Claim 2
Dependent Claim 182 words
A composition comprising a mixture of amino acids and alkali metal salts thereof comprising amino acids and salts represented by the formulae: ##STR7## wherein R is hydrogen or methyl, X is hydrogen or an alkali metal and R' and R" are each selected from the group consisting of: (a) substituted or unsubstituted, linear or branched, alkyl radicals having one to twenty carbon atoms; (b) substituted or unsubstituted alkylene radicals each having three to six carbon atoms and R' and R" together forming a cyclic ring; (c) substituted or unsubstituted cycloalkyl radicals having from four to eight ring carbon atoms; (d) substituted or unsubstituted, hydroxy-alkyl radicals, linear or branched, having from one to twenty carbon atoms; (e) substituted or unsubstituted aralkyl radicals having from seven to twenty carbon atoms, and wherein R'" is selected from the group consisting of substituted or unsubstituted linear alkyl radicals having from one to twenty carbon atoms; and wherein the substituent group of (a) thru (e) above, are selected from the group consisting of hydroxyl groups, ether linkages, silane groups, and heterocyclic rings containing oxygen in their rings.
Claim 3
Dependent Claim 19 words
The composition of claim 1 wherein the mole ratio of the two amino acids ranges from 1:3 to 3:1.
Claim 4
Dependent Claim 39 words
The composition of claim 1 wherein R is hydrogen or a methyl radical, and R' and R" are each selected from the group consisting of C 1 -C 6 hydrocarbon radicals and R'" is a methyl or ethyl radical.
Claim 5
Dependent Claim 32 words
The composition of claim 5 wherein R is hydrogen, R' and R" are each selected from the group consisting of C 1 -C 3 hydrocarbon radicals and R'" is a methyl radical.
Claim 6
Dependent Claim 16 words
A composition comprising N-secondary butyl glycine and N-secondary butyl N-methyl glycine and their alkali metal salts.
Claim 7
Dependent Claim 16 words
A composition comprising N-secondary butyl glycine and N-secondary butyl N-methyl glycine and their alkali metal salts.
Claim 8
Dependent Claim 22 words
The composition of claim 5 wherein the mole ratio of the two amino acids or their salts ranges from 1:3 to 3:1.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-06-24 1988-12-24 1989-06-25 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-06-24 1992-12-24 1993-06-25 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-06-24 1996-12-24 1997-06-25 $7700.00 Window Closed / Lapsed

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