US4661634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removal of impurities from amines
Assignee: Dow Chemical Co
•
Filing: 1985-09-16
•
Granted: 1987-04-28
•
Expires: 2005-09-16
Abstract
Abstract Particles, fibers, or filaments of alkali salts of ethylene/carboxylic acid copolymers or terpolymers, especially in highly porous form, are employed in removing contaminants from tertiary amines or quaternary amine salts, especially metal contaminants.
Inventors
- 👤 Walter L. Vaughn
- 👤 Milton S. Wing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:33
CPC Classifications
C; C01; C01G; C01G21/00; C01G21/003; C01D; C01D15/00; C01D15/04; C01D3/00; C01D3/14; C01D3/145; C01D3/16; C01F; C01F11/00; C01F11/005; C01F7/00; C01G3/00; C01G3/003; C01G37/00; C01G37/003; C01G49/00; C01G49/0009; C01G53/00; C01G53/01; C01G9/00; C01G9/003; C22; C22B; C22B3/00; C22B3/20; C22B3/22; C22B3/24; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
126 words
A method of removing undissolved, dissolved, polar, or ionizable contaminants from an impure fluid tertiary amine or quaternary amine salt, said method comprising contacting the said fluid amine or amine salt with an ethylene copolymer having pendant carboxylic acid groups in the alkali salt form, said copolymer being in particulate form having a surface area/weight ratio of at least about 1 m 2 /gm, and separating the fluid amine or amine salt from the particulate polymer whereby impurities are removed from the amine or amine salt, while maintaining the temperature above the freezing point of the fluid amine or amine salt and below the boiling point or decomposition point of the amine or amine salt as well as below the melting point of the said copolymer.
Claim 2
Independent Claim
126 words
A method of removing undissolved, dissolved, polar, or ionizable contaminants from an impure fluid tertiary amine or quaternary amine salt, said method comprising contacting the said fluid amine or amine salt with an ethylene copolymer having pendant carboxylic acid groups in the alkali salt form, said copolymer being in particulate form having a surface area/weight ratio of at least about 1 m 2 /gm, and separating the fluid amine or amine salt from the particulate polymer whereby impurities are removed from the amine or amine salt, while maintaining the temperature above the freezing point of the fluid amine or amine salt and below the boiling point or decomposition point of the amine or amine salt as well as below the melting point of the said copolymer.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the amine is in solution in water.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the amine is a tertiary amine.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the amine is a quaternary ammonium salt.
Claim 6
Dependent Claim
52 words
The method of claim 1 wherein the amine is a quaternary ammonium salt conforming essentially to the empirical formula R 4 NX, where R represents alkyl and/or substituted alkyl groups and X represents at least one inorganic salt moiety of the group comprising halide, nitrate, sulfate, hydroxyl, sulfite, nitrite, thiosulfate, and carbonate.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein the amine salt is the quaternary ammonium salt, 1-chloro-2-hydroxypropyl-trimethyl ammonium chloride.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein the contaminants in the amines comprise metal compounds.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the contaminants in the amines comprise iron compounds.
Claim 10
Dependent Claim
36 words
The method of claim 1 wherein the ethylene polymer comprises ethylene copolymerized with an olefinically-unsaturated carboxylic acid of the group comprising acrylic acid, methacrylic acid, crotonic acid, fumaric acid, maleic acid, itaconic acid and butenoic acid.
Claim 11
Dependent Claim
15 words
The method of claim 1 wherein the ethylene polymer comprises ethylene copolymerized with acrylic acid.
Claim 12
Dependent Claim
15 words
The method of claim 1 wherein the ethylene polymer comprises ethylene copolymerized with methacrylic acid.
Claim 13
Dependent Claim
17 words
The method of claim 1 wherein the ethylene polymer comprises small particles and/or fibers which are porous.
Claim 14
Dependent Claim
25 words
The method of claim 1 wherein the ethylene polymer comprises an array of small particles or fibers composited in the manner of a filter material.
Claim 15
Dependent Claim
21 words
The method of claim 1 wherein the ethylene polymer comprises a woven, non-woven, knitted, or sintered array of fibers or filaments.
Claim 16
Dependent Claim
6 words
A composition comprising ethylene/1-chloro-2-hydroxypropyl-trimethylammonium acrylate copolymer.
Claim 17
Dependent Claim
6 words
A composition comprising ethylene/1-chloro-2-hydroxypropyl-trimethylammonium acrylate copolymer.
Claim 18
Dependent Claim
24 words
The method of claim 1 wherein the said contacting is done by mixing together the fluid amine or amine salt and the said copolymer.
Claim 19
Dependent Claim
38 words
The method of claim 1 wherein the said contacting is done by passing the said fluid amine or amine salt through a quantity of the said copolymer, whereby impurities are removed from the said amine or amine salt.
Claim 20
Dependent Claim
54 words
The method of claim 1 wherein the said contacting is done by mixing together the fluid amine or amine salt and the said copolymer, and the said separating is done by filtering the said copolymer out of the said amine or amine salt, whereby impurities are removed from the said amine or amine salt.
Claim 21
Dependent Claim
28 words
The method of claim 1 wherein the said alkali salt form of the said acid groups is an amine salt, an ammonium salt or an alkali metal salt.
Claim 22
Dependent Claim
20 words
The method of claim 1 wherein the said alkali salt form of the said acid groups is the sodium salt.
Claim 23
Dependent Claim
20 words
The method of claim 1 wherein the said alkali salt form of the said acid groups is the ammonium salt.
Claim 24
Dependent Claim
13 words
The method of claim 1 wherein the temperature is ambient or near ambient.
Claim 25
Dependent Claim
19 words
The method of claim 1 wherein the copolymer has a MFR in the range of about 15-2600 g/10 minutes.
Claim 26
Dependent Claim
18 words
The method of claim 1 wherein the copolymer has a MFR in the range of 300±100 g/10 minutes.
Claim 27
Dependent Claim
25 words
The method of claim 1 wherein the amount of acid groups in the said copolymer is in the range of about 8% to about 40%.
Claim 28
Dependent Claim
25 words
The method of claim 1 wherein the amount of acid groups in the said copolymer is in the range of about 12% to about 40%.
Claim 29
Dependent Claim
25 words
The method of claim 1 wherein the amount of acid groups in the said copolymer is in the range of about 20% to about 40%.
Claim 30
Dependent Claim
17 words
The method of claim 1 wherein the impurities comprise soluble metal compounds or particles of metal compounds.
Claim 31
Dependent Claim
26 words
The method of claim 1 wherein the impurities comprise soluble metal compounds or particles of metal compounds of Fe, Cr, Cu, Zn, Mg, Ca, or Al.
References Cited (Backward Citations)
US2775604A
Cited
US3468816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |