US4452703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of scale in sugar evaporation equipment
Assignee: ECC SPECIALTY CHEMICALS Inc
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Filing: 1983-05-24
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Granted: 1984-06-05
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Expires: 2003-05-24
Abstract
Abstract The instant invention is directed to a method for preventing the formation of scale in sugar evaporation equipment comprising adding to the juice from 0.1 to 200 ppm of a polycarboxylic acid or its salt selected from the group consisting of polymaleic acid, amine adducts of maleic anhydride polymers, phosphonobutane tri-carboxylic acid, phosphinocarboxylic acids and copolymers of acrylic acid and an hydroxylated lower alkyl acrylate.
Inventors
- 👤 Paul H. Ralston
- 👤 Sandra L. Whitney
- 👤 Jerry L. Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:29
CPC Classifications
C; C13; C13B; C13B30/00; C13B30/002; C13B30/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
A method for preventing the formation of calcium phosphate and calcium hydroxide scale in sugar juice evaporation equipment comprising adding to the juice from about 0.1 to about 200 ppm of a polycarboxylic acid or its salt selected from the group consisting of polymaleic acid or amine adducts of maleic anhydride polymers, phosphonobutane tri-carboxylic acid, phophinocarboxylic acids and copolymers of an acrylic acid and an hydroxylated lower alkyl acrylate.
Claim 2
Independent Claim
69 words
A method for preventing the formation of calcium phosphate and calcium hydroxide scale in sugar juice evaporation equipment comprising adding to the juice from about 0.1 to about 200 ppm of a polycarboxylic acid or its salt selected from the group consisting of polymaleic acid or amine adducts of maleic anhydride polymers, phosphonobutane tri-carboxylic acid, phophinocarboxylic acids and copolymers of an acrylic acid and an hydroxylated lower alkyl acrylate.
Claim 3
Dependent Claim
11 words
The method of claim 1, wherein said polycarboxylate is polymaleic acid.
Claim 4
Dependent Claim
19 words
The method of claim 2, wherein said polymaleic acid has a molecular weight of about 200 to about 40,000.
Claim 5
Dependent Claim
17 words
The method of claim 1, wherein said polycarboxylate is an amine adduct of a maleic anhydride polymer.
Claim 6
Dependent Claim
12 words
The method of claim 1, wherein said polycarboxylate is phophonobutane tri-carboxylic acid.
Claim 7
Dependent Claim
12 words
The method of claim 1, wherein said polycarboxylate is a phosphinocarboxylic acid.
Claim 8
Dependent Claim
13 words
The method of claim 1, wherein copolymer is a hydroxypropyl acrylate/sodium acrylate copolymer.
Claim 9
Dependent Claim
39 words
The method of claim 7, wherein said hydroxypropyl acrylate/sodium acrylate copolymer has a mole ratio of sodium acrylate to hydroxypropyl acrylate of from about 30:1 to about 1:3 and a molecular weight of from about 500 to about 500,000.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |