Patent US4054678A successfully refreshed from Google Patents.
US4054678A
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Sodium aluminum phosphate
Assignee: Stauffer Chemical Co
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Filing: 1976-03-30
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Granted: 1977-10-18
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Expires: 1996-03-30
Abstract
Abstract A potassium modified 1:3:8 sodium aluminum phosphate having improved flow characteristics and dust properties particularly suited for refrigerated baking applications.
Inventors
- 👤 Robert E. Benjamin
- 👤 James C. Anglea
- 👤 Thomas E. Edging
- 👤 Jerry D. Griffith
- 👤 A. J. Patterson
- 👤 Thelton A. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:53
CPC Classifications
A; A21; A21D; A21D2/00; A21D2/02; C; C01; C01B; C01B25/00; C01B25/16; C01B25/26; C01B25/45
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
212 words
A process for the preparation of an improved potassium modified 1:3:8 sodium aluminum phosphate which comprises: a. contacting, at a temperature above 40° C., a food grade phosphoric acid having a concentration of about 85.0 to about 88.0 weight percent H 3 PO 4 with a sufficient amount of potassium ion to provide an analysis of about 0.5 to about 1.2 weight percent K 2 O in the final product, and a sufficient amount of sodium ion to provide an analysis of about 2.4 to about 3.2 weight percent of Na 2 O in the final product; b. contacting the sodium-potassium treated phosphoric acid with a sufficient amount of alumina to provide a concentration of about 15 to about 17% by weight A1 2 O 3 in the final product; c. cooling the slurry of potassium modified sodium aluminum phosphate thereby formed to a temperature varying from about 60 to about 75° C; d. drying and granulating the potassium modified sodium aluminum phosphate; e. milling and classifying the potassium modified sodium aluminum phosphate to obtain the following particle size distribution: from about 0.1 to about 5% retained on 60 mesh; from about 3 to about 20% through 60 on 100 mesh; from about 9 to about 50% through 100 on 140 mesh.
Claim 2
Dependent Claim
212 words
A process for the preparation of an improved potassium modified 1:3:8 sodium aluminum phosphate which comprises: a. contacting, at a temperature above 40° C., a food grade phosphoric acid having a concentration of about 85.0 to about 88.0 weight percent H 3 PO 4 with a sufficient amount of potassium ion to provide an analysis of about 0.5 to about 1.2 weight percent K 2 O in the final product, and a sufficient amount of sodium ion to provide an analysis of about 2.4 to about 3.2 weight percent of Na 2 O in the final product; b. contacting the sodium-potassium treated phosphoric acid with a sufficient amount of alumina to provide a concentration of about 15 to about 17% by weight A1 2 O 3 in the final product; c. cooling the slurry of potassium modified sodium aluminum phosphate thereby formed to a temperature varying from about 60 to about 75° C; d. drying and granulating the potassium modified sodium aluminum phosphate; e. milling and classifying the potassium modified sodium aluminum phosphate to obtain the following particle size distribution: from about 0.1 to about 5% retained on 60 mesh; from about 3 to about 20% through 60 on 100 mesh; from about 9 to about 50% through 100 on 140 mesh.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein said potassium ion is provided by a compound selected from the group consisting of potassium hydroxide, potassium carbonate, and potassium phosphate.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein said potassium compound is potassium hydroxide.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein said sodium ion is provided by a compound selected from the group consisting of sodium carbonate, sodium hydroxide, sodium bicarbonate and sodium phosphate.
Claim 6
Dependent Claim
12 words
The process of claim 4 wherein said sodium compound is sodium carbonate.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the reaction of Step (b) lasts for about 1 to about 3 hours.
Claim 8
Dependent Claim
27 words
The process of claim 1, Step (d) wherein the potassium modified sodium aluminum phosphate has a loss on ignition of from 21.0 to about 23.0 weight percent.
Claim 9
Dependent Claim
23 words
The process of claim 1, Step (a) wherein the anaylsis of K 2 O varies from about 0.6 to about 1.0 weight percent.
Claim 10
Dependent Claim
106 words
An improved potassium modified 1:3:8 sodium aluminum phosphate composition formed from the process of claim 3, having the following analysis: 0.8 ± 0.2 weight percent K 2 O, 2.8 ± 0.2 weight percent Na 2 O, and 16.0 ± 1.0 weight percent Al 2 O 3 in the final product, and which exhibits X-ray diffraction lines of major intensity at d-spacings of approximately 8.61, 8.46 and 3.69 angstroms, and has the following sieving characteristics: From about 0.1 to about 5% retained on 60 mesh; From about 3 to about 20% through 60, on 100 mesh; From about 9 to about 50% through 100, on 140 mesh.
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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |