Patent US1761708A successfully refreshed from Google Patents.
US4096085A
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Gas scrubbing system
Assignee: Dow Chemical Co
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Filing: 1976-10-29
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Granted: 1978-06-20
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Expires: 1996-10-29
Abstract
Abstract An aqueous organic amine acid gas scrubbing system, particularly an aqueous N-methyldiethanolamine or diethanolamine acid gas scrubbing system having incorporated therein (1) a compound or mixture of compounds having the formula ##STR1## wherein n is an integer from 1 to 3, m is an integer from 2 to a number sufficient to yield a molecular weight of about 800, R 1 , R 2 , R 3 and R 4 are each independently selected from the group consisting of --H, --C n' H 2n' OH, --C n' H 2n'+1 , --C n' H 2n' N(R 3 )R 4 wherein n' is an integer from 1 to 2 and wherein R 1 -R 3 and R 2 -R 4 may be joined to form cyclic amines when n is 2; said compound being present in about 10 to about 2000 parts per million parts of treating solution; (2) copper or a copper ion yielding compound in from 0 to 1000 ppm; and (3) sulfur or a sulfur atom yielding compound in from 0 to 1000 ppm.
Inventors
- 👤 Smallwood Holoman Jr.
- 👤 Robert G. Asperger
- 👤 Leroy S. Krawczyk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:16
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/06; B; B01; B01D; B01D53/00; B01D53/14; B01D53/1493; C23F11/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
155 words
A corrosion inhibited aqueous N-methyldiethanolamine or diethanolamine acid gas treating solution consisting essentially of (1) an amine compound or mixture of compounds having the formula ##STR3## wherein n is an integer from 1 to 3, m is an integer 2 to an integer to yield a molecular weight of about 800 and each R represents a member selected from the group consisting of --H, --C n ,H 2n' ,OH, C n ,H 2n' , or --C n ,H 2n' ,N(R 3 )R 4 , n' is an integer from 1 to 2, and wherein R 1 R 3 and R 2 R 4 are joined together and n' is 2; said compound being present in about 10 to about 2000 parts per million parts treating solution; (2) copper or a copper ion yielding compound in from 0 to 1000 ppm; and (3) sulfur or a sulfur atom yielding compound in from 0 to 1000 ppm.
Claim 2
Dependent Claim
155 words
A corrosion inhibited aqueous N-methyldiethanolamine or diethanolamine acid gas treating solution consisting essentially of (1) an amine compound or mixture of compounds having the formula ##STR3## wherein n is an integer from 1 to 3, m is an integer 2 to an integer to yield a molecular weight of about 800 and each R represents a member selected from the group consisting of --H, --C n ,H 2n' ,OH, C n ,H 2n' , or --C n ,H 2n' ,N(R 3 )R 4 , n' is an integer from 1 to 2, and wherein R 1 R 3 and R 2 R 4 are joined together and n' is 2; said compound being present in about 10 to about 2000 parts per million parts treating solution; (2) copper or a copper ion yielding compound in from 0 to 1000 ppm; and (3) sulfur or a sulfur atom yielding compound in from 0 to 1000 ppm.
Claim 3
Dependent Claim
23 words
The corrosion inhibited composition of claim 1 wherein the amine compound is polyethylene polyamine mixture having an average molecular weight of about 250-300.
Claim 4
Dependent Claim
20 words
The corrosion inhibited composition of claim 1 wherein the amine compound is polyethylenimine having a molecular weight of about 600.
Claim 5
Dependent Claim
21 words
The corrosion inhibited composition of claim 1 wherein the amine compound is polyethylenimine having an average molecular weight of about 300.
Claim 6
Dependent Claim
23 words
The corrosion inhibited composition of claim 1 wherein the amine compound is a polyethylene polyamine having an average molecular weight of about 250-300.
Claim 7
Dependent Claim
15 words
The corrosion inhibited composition of claim 1 wherein the amine compound is tris(aminoethyl)amine, mixed branched-linear.
Claim 8
Dependent Claim
32 words
The corrosion inhibited composition of claim 1 wherein the amine compound is a mixture of 35 to 45 weight percent diethylenetriamine, 10-15 weight percent triethylenediamine ##STR4## and 5 to 15 percent piperazine.
Claim 9
Dependent Claim
13 words
The corrosion inhibited composition of claim 1 wherein the amine compound is pentaethylenehexaamine.
Claim 10
Dependent Claim
19 words
The corrosion inhibited composition of claim 1 wherein the amine compound is a polymeric mixture of triethylenetetraamine and divinylbenzene.
Claim 11
Dependent Claim
20 words
The corrosion inhibited composition of claim 1 wherein the amine compound is the reaction product of divinylbenzene, ethylvinylbenzene and diethylenetriamine.
Claim 12
Dependent Claim
13 words
The corrosion inhibited composition of claim 1 wherein the amine compound is diethylenetriamine.
Claim 13
Dependent Claim
18 words
The corrosion inhibited composition of claim 1 wherein the amine compound is methylchloride quaternary salt of divinylbenzene diethylenetriamine.
Claim 14
Dependent Claim
14 words
The corrosion inhibited composition of claim 1 wherein the amine compound is tetraethylene pentaamine.
Claim 15
Dependent Claim
50 words
The corrosion inhibited composition of claim 1 wherein the amine compound is a solids free mixture of 8-9 weight percent tetraethylene pentamine, 30-35 weight percent pentaethylene hexamine and 55 weight percent hexaethylene heptamine and the balance branched and cyclic isomers having an average molecular weight of about 250 to 300.
Claim 16
Dependent Claim
25 words
The corrosion inhibited composition of claim 1 wherein the amine compound is a mixture of 85 weight percent aminoethyl piperazine and 15 weight percent diethylenetriamine.
References Cited (Backward Citations)
US3959170A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |