Patent US3855397A successfully refreshed from Google Patents.
US3855397A
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Method of producing sodium carbonate and bicarbonate spherules from brine
Assignee: Honeywell International Inc
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Filing: 1973-04-12
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Granted: 1974-12-17
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Expires: 1993-04-12
Abstract
Abstract Free-flowing spherules of sodium bicarbonate are prepared from a sodium carbonate or from salt brine, substantially saturated with ammonia, by carbonating the sodium carbonate solution, or the ammonia-saturated brine with carbon dioxide in the presence of from 200 to 2500 parts per million of a water soluble alkaline phosphate. Spherules of sodium bicarbonate crystallizing from the solutions are separated as a product having a bulk density between about 32 to 48 pounds per cubic foot, and a screen size substantially between 14 and 100 mesh. Sodium carbonate spherules are also readily obtained by calcining the sodium bicarbonate spherules.
Inventors
- 👤 R Hoffman
- 👤 A Follows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:32
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/18; C01D7/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
103 words
A PROCESS FOR MAKING SODIUM BICARBONATE IN THE FORM OF CRYSTALLINE SPHERULES FROM A SOLUTION CONTAINING BETWEEN ABOUT 15 TO 25 PERCENT OF SODIUM SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM CHLORIDE AND SODIUM CARBONATE, WHICH COMPRISES ADDING FROM 200 TO 2500 PARTS PER MILLION BY WEIGHT OF THE SOLUTION OF A WATER-SOLUBLE ALKALINE PHOSPHORUSCONTAINING COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL PHOSPHATE, HYPOPHOSPHATES, PHOSPHITES, HYPOPHOSPHITES AND PHOSPHIDES, AND CARBONATING THE SOLUTION UNDER CONDITION TO EFFECT COVERSION OF THE SODIUM SALT TO SODIUM BICARBONATE, AND RECOVERING THE SODIUM BICARBONATE SUBSTANTIALLY IN THE FORM OF CRYSTALLINE SPHERULES.
Claim 2
Dependent Claim
103 words
A PROCESS FOR MAKING SODIUM BICARBONATE IN THE FORM OF CRYSTALLINE SPHERULES FROM A SOLUTION CONTAINING BETWEEN ABOUT 15 TO 25 PERCENT OF SODIUM SALT SELECTED FROM THE GROUP CONSISTING OF SODIUM CHLORIDE AND SODIUM CARBONATE, WHICH COMPRISES ADDING FROM 200 TO 2500 PARTS PER MILLION BY WEIGHT OF THE SOLUTION OF A WATER-SOLUBLE ALKALINE PHOSPHORUSCONTAINING COMPOUND SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL AND ALKALINE EARTH METAL PHOSPHATE, HYPOPHOSPHATES, PHOSPHITES, HYPOPHOSPHITES AND PHOSPHIDES, AND CARBONATING THE SOLUTION UNDER CONDITION TO EFFECT COVERSION OF THE SODIUM SALT TO SODIUM BICARBONATE, AND RECOVERING THE SODIUM BICARBONATE SUBSTANTIALLY IN THE FORM OF CRYSTALLINE SPHERULES.
Claim 3
Dependent Claim
33 words
The process as claimed in claim 1 wherein the water soluble alkaline phosphate is selected from the group consisting of the water soluble phosphates, hypophosphates, phosphites, hypophosphites, and phosphides of the alkali metals.
Claim 4
Dependent Claim
26 words
The process as claimed in claim 1 wherein the water soluble alkaline phosphate is selected from the group consisting of (NaPO3)6; K5P3O10; Na5P3O10; Na4P2O7 and K4P2O7.
Claim 5
Dependent Claim
28 words
The process as claimed in claim 1 wherein the water soluble alkaline phosphate is (NaPO3)6 and the quantity used is within the range of 300 to 2000 ppm.
Claim 6
Dependent Claim
33 words
The process as claimed in claim 1 wherein the crystalline spherules of sodium bicarbonate are dried, and calcined at 150*-350*C. to provide a sodium carbonate product substantially in the form of spherical particles.
Claim 7
Dependent Claim
102 words
A process for making sodium bicarbonate in the form of crystalline spherules from a sodium carbonate solution containing between about 15 to 25 percent sodium carbonate, comprising: a. introducing 200 to 2500 ppm by weight of a water-soluble alkaline phosphate selected from the group consisting of alkali metal and alkaline earth metal phosphates, hypophosphates, phosphites, hypophosphites and phosphides; b. carbonating the solution under conditions to effect carbonation while maintaining the temperature below about 70*C. until substantially all of the carbonate is converted to bicarbonate; c. cooling the solution to below about 35*C.; and d. recovering the sodium bicarbonate from the carbonated solution.
Claim 8
Dependent Claim
102 words
A process for making sodium bicarbonate in the form of crystalline spherules from a sodium carbonate solution containing between about 15 to 25 percent sodium carbonate, comprising: a. introducing 200 to 2500 ppm by weight of a water-soluble alkaline phosphate selected from the group consisting of alkali metal and alkaline earth metal phosphates, hypophosphates, phosphites, hypophosphites and phosphides; b. carbonating the solution under conditions to effect carbonation while maintaining the temperature below about 70*C. until substantially all of the carbonate is converted to bicarbonate; c. cooling the solution to below about 35*C.; and d. recovering the sodium bicarbonate from the carbonated solution.
Claim 9
Dependent Claim
112 words
A process for making sodium bicarbonate in the form of crystalline spherules from a sodium chloride solution containing between about 15 to 25 percent sodium chloride substantially saturated with NH3, comprising: a. introducing 200 to 2500 ppm by weight of a water-soluble alkaline phosphate selected from the group consisting of alkali metal and alkaline earth metal phosphates, hypophosphates, phosphites, hypophosphites and phosphides; b. carbonating the solution under conditions to effect carbonation while maintaining the temperature below about 70*C. until substantially all of the sodium chloride present in said solution is converted to sodium bicarbonate; c. cooling the solution to below about 35*C.; and d. recovering the sodium bicarbonate from the carbonated solution.
Claim 10
Dependent Claim
112 words
A process for making sodium bicarbonate in the form of crystalline spherules from a sodium chloride solution containing between about 15 to 25 percent sodium chloride substantially saturated with NH3, comprising: a. introducing 200 to 2500 ppm by weight of a water-soluble alkaline phosphate selected from the group consisting of alkali metal and alkaline earth metal phosphates, hypophosphates, phosphites, hypophosphites and phosphides; b. carbonating the solution under conditions to effect carbonation while maintaining the temperature below about 70*C. until substantially all of the sodium chloride present in said solution is converted to sodium bicarbonate; c. cooling the solution to below about 35*C.; and d. recovering the sodium bicarbonate from the carbonated solution.
Claim 11
Dependent Claim
28 words
The process as claimed in claim 7 wherein the water-soluble alkaline phosphate is sodium hexametaphosphate, present in the solution to the extent of between 300 and 2000 ppm.
References Cited (Backward Citations)
US364552A
Cited
US1921505A
Cited
US2773739A
Cited
US2842489A
Cited
US3072466A
Cited
US3719745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |