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Stable suspensions of water-soluble polymers and their manufacture
Assignee: IFP Energies nouvelles
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Filing: 1983-01-18
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Granted: 1984-06-12
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Expires: 2003-01-18
Abstract
Abstract Stable suspension of a water-soluble polymer comprising solid particles of this water-soluble polymer in a liquid hydrocarbon medium which also comprises a thickening agent selected from the alkali or alkaline-earth metal salts of fatty acids having 6-33 carbon atoms. The resultant suspensions are stable and dissolve easily when dispersed in water; they can be used in enhanced oil recovery. They may also contain minor proportions of water and/or of C 1 -C 12 monoalcohols or C 2 -C 12 diols.
Inventors
- 👤 Francois Dawans
- 👤 Daniel Binet
- 👤 Norbert Kohler
- 👤 Quang D. Vu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:15
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/11; C08J2300/00; C08J2300/10; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936; Y10S524/00; Y10S524/923
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
178 words
A stable suspension of a water-soluble polymer in a liquid hydrocarbon medium resulting from the steps of (1) mixing a liquid hydrocarbon medium, non-solvent for said water-soluble polymer and comprising at least one aliphatic or aromatic hydrocarbon, with at least one thickening agent selected from the alkali or alkaline-earth metal salts of fatty acids having 6-33 carbon atoms, in a proportion of from 0.1 to 5 parts by weight per 100 parts by weight of said liquid hydrocarbon medium, and (2) adding to the resulting mixture solid particles of at least one water-soluble polymer in a proportion of from 40 to 150 parts by weight per 100 parts by weight of said liquid hydrocarbon medium, and based on 100 parts by weight of said solid particles of at least one water-soluble polymer at least one member selected from the group consisting of 0.1 to 10 parts by weight water, 0.1 to 50 parts by weight of a C 1 -C 12 aliphatic monoalcohol and 0.1 to 50 parts by weight of a C 2 -C 12 aliphatic diol.
Claim 2
Dependent Claim
178 words
A stable suspension of a water-soluble polymer in a liquid hydrocarbon medium resulting from the steps of (1) mixing a liquid hydrocarbon medium, non-solvent for said water-soluble polymer and comprising at least one aliphatic or aromatic hydrocarbon, with at least one thickening agent selected from the alkali or alkaline-earth metal salts of fatty acids having 6-33 carbon atoms, in a proportion of from 0.1 to 5 parts by weight per 100 parts by weight of said liquid hydrocarbon medium, and (2) adding to the resulting mixture solid particles of at least one water-soluble polymer in a proportion of from 40 to 150 parts by weight per 100 parts by weight of said liquid hydrocarbon medium, and based on 100 parts by weight of said solid particles of at least one water-soluble polymer at least one member selected from the group consisting of 0.1 to 10 parts by weight water, 0.1 to 50 parts by weight of a C 1 -C 12 aliphatic monoalcohol and 0.1 to 50 parts by weight of a C 2 -C 12 aliphatic diol.
Claim 3
Dependent Claim
20 words
A stable suspension of a water-soluble polymer according to claim 1 wherein, in the second step, said water is added.
Claim 4
Dependent Claim
34 words
A stable suspension of a water-soluble polymer according to claim 2 wherein the proportion of water added is from 3 to 6 parts by weight per 100 parts by weight of said water-soluble polymer.
Claim 5
Dependent Claim
33 words
A stable suspension of a water-soluble polymer according to claim 1 wherein, in the second step, said C 1 -C 12 aliphatic monoalcohol or said C 2 -C 12 aliphatic diol is added.
Claim 6
Dependent Claim
46 words
A stable suspension of a water-soluble polymer according to claim 4 wherein the proportion of C 1 -C 12 aliphatic monoalcohol or C 2 -C 12 aliphatic diol added is from 5 to 20 parts by weight per 100 parts by weight of said water-soluble polymer.
Claim 7
Dependent Claim
27 words
A stable suspension of a water-soluble polymer according to claim 1 wherein said C 1 -C 12 aliphatic monoalcohol is methyl-, ethyl-, isopropyl-, isobutyl-, t.butyl-, or octylalcohol.
Claim 8
Dependent Claim
24 words
A stable suspension of a water-soluble polymer according to claim 1 wherein said C 2 -C 12 aliphatic diol is ethyleneglycol or 1,4 pentanediol.
Claim 9
Dependent Claim
28 words
A stable suspension of a water-soluble polymer according to claim 7 wherein said hydrocarbon medium consists of a petroleum cut selected from kerosenes, gasolines, naphthas, gas-oils and fuel-oils.
Claim 10
Dependent Claim
21 words
A stable suspension of a water-soluble polymer according to claim 1 wherein steps (1) and (2) are conducted at ambient temperature.
Claim 11
Dependent Claim
34 words
A stable suspension of a water-soluble polymer according to claim 1 wherein step (1) is conducted at a temperature of from 40° to 150° C. and step (2) is conducted at below 40° C.
Claim 12
Dependent Claim
27 words
A stable suspension of a water-soluble polymer according to claim 1 wherein said thickening agent is a sodium salt of a fatty acid having 6-33 carbon atoms.
Claim 13
Dependent Claim
50 words
A stable suspension of a water-soluble polymer according to claim 1 wherein said water-soluble polymer consists of at least one polyalkane comprising a sufficient number of hydrophilic groups selected from the carboxylates, sulfonates amines, imines, ammonium, carboxamides, imides, hydroxy, acetyl, cetyl, carbamates and lactams, to be soluble in aqueous medium.
Claim 14
Dependent Claim
45 words
A stable suspension of a water-soluble polymer according to claim 1 wherein said water-soluble polymer is selected from polyvinyl alcohol, carboxymethylcellulose, hydroxyethylcellulose, carboxymethylhydroxyethyl cellulose, polysaccharides, polyacrylic and polymethacrylic acids, their salts, polyacrylamide, polymethacrylamide, poly-N-dimethylamino acrylamide and the acrylamide-acrylic acid, ethylene-acrylic acid and styrene-maleic acid copolymers.
Claim 15
Dependent Claim
28 words
A stable suspension according to claim 1 wherein the water-soluble polymer is selected from the partially hydrolyzed polyacrylamides, the copolymers of acrylamide with acrylic acid and the polysaccharides.
Claim 16
Dependent Claim
27 words
A stable suspension of a water-soluble polymer according to claim 1 wherein the particles of said water-soluble polymer have a size from 10 microns to 1 mm.
Claim 17
Dependent Claim
37 words
A stable suspension of a water-soluble polymer according to claim 1 wherein said hydrocarbon medium comprises at least one aliphatic or aromatic hydrocarbon which is liquid at room temperature and comprises from 5 to 30 carbon atoms.
Claim 18
Dependent Claim
56 words
A stable suspension of a water-soluble polymer according claim 1 wherein at least one surfactant selected from the hydrophilic non-ionic emulsifying agents and the hydrophilic anionic emulsifying agents is further added in the first step, in a proportion of from 0.1 to 5 parts by weight per 100 parts by weight of said liquid hydrocarbon medium.
Claim 19
Dependent Claim
46 words
An aqueous solution of polymer for use in enhanced oil recovery and obtained by dispersing in water a stable suspension of a water-soluble polymer according to claim 1, said solution having a concentration of water-soluble polymer from 0.005 to 1% by weight with respect to water.
Claim 20
Dependent Claim
53 words
In an enhanced oil recovery process comprising flooding an oil field by injecting an aqueous solution in an injection well so as to displace the oil from the underground rock formation into the production well, the improvement comprising adding to the aqueous solution the stable suspension of water-soluble polymer according to claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |