US3870784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sodium bicarbonate production
Assignee: Olin Corp
•
Filing: 1972-11-10
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Granted: 1975-03-11
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Expires: 1992-11-10
Abstract
Abstract Coarse sodium bicarbonate crystals of controlled size are produced by spraying an aqueous mixture of soda ash and sodium bicarbonate into an atmosphere containing CO2 in a carbonating zone; simultaneously evaporating water from the aqueous mixture; collecting the resulting slurry of bicarbonate crystals in mother liquor in a crystallization zone; removing therefrom a slurry stream of coarse sodium bicarbonate crystals; separating coarse crystals of sodium bicarbonate from said slurry and recycling the resultant mother liquor. The separated crystals are suitably washed, dried and sized to obtain the sodium bicarbonate product.
Inventors
- 👤 Walter C Saeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:55
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/10
Claims Analysis
Total Claims: 50
Claim 1
Independent Claim
20 words
A METHOD FOR PRODUCING SODIUM BICARBONATE BY CARBONATING SODIUM CARBONATE IN AN ABSORBER-CRYSTALLIZER TO PRECIPIATATE SODIUM BICARBONATE CRYSTALS WHICH COMPRISES:
Claim 2
Independent Claim
20 words
A METHOD FOR PRODUCING SODIUM BICARBONATE BY CARBONATING SODIUM CARBONATE IN AN ABSORBER-CRYSTALLIZER TO PRECIPIATATE SODIUM BICARBONATE CRYSTALS WHICH COMPRISES:
Claim 3
Dependent Claim
25 words
MAINTAINING IN A CRYSTALLIZATION ZONE A MIXTURE COMPRISING SODIUM BICARBONATE CRYSTALS IN AN AQUEOUS SOLUTION OF SODIUM CARBONATE SATURATED AND IN EQUILIBRIUM WITH SODIUM BICARBONATE;
Claim 4
Dependent Claim
25 words
MAINTAINING IN A CRYSTALLIZATION ZONE A MIXTURE COMPRISING SODIUM BICARBONATE CRYSTALS IN AN AQUEOUS SOLUTION OF SODIUM CARBONATE SATURATED AND IN EQUILIBRIUM WITH SODIUM BICARBONATE;
Claim 5
Independent Claim
20 words
A method for producing sodium bicarbonate by carbonating sodium carbonate in an absorber-crystallizer to precipitate sodium bicarbonate crystals which comprises:
Claim 6
Independent Claim
20 words
A method for producing sodium bicarbonate by carbonating sodium carbonate in an absorber-crystallizer to precipitate sodium bicarbonate crystals which comprises:
Claim 7
Dependent Claim
25 words
maintaining in a crystallization zone a mixture comprising sodium bicarbonate crystals in an aqueous solution of sodium carbonate saturated and in equilibrium with sodium bicarbonate;
Claim 8
Dependent Claim
25 words
maintaining in a crystallization zone a mixture comprising sodium bicarbonate crystals in an aqueous solution of sodium carbonate saturated and in equilibrium with sodium bicarbonate;
Claim 9
Dependent Claim
25 words
maintaining in a crystallization zone a mixture comprising sodium bicarbonate crystals in an aqueous solution of sodium carbonate saturated and in equilibrium with sodium bicarbonate;
Claim 10
Dependent Claim
25 words
maintaining in a crystallization zone a mixture comprising sodium bicarbonate crystals in an aqueous solution of sodium carbonate saturated and in equilibrium with sodium bicarbonate;
Claim 11
Dependent Claim
18 words
maintaining in a contiguous carbonating zone above said crystallization zone an atmosphere having at least 4% carbon dioxide;
Claim 12
Dependent Claim
18 words
maintaining in a contiguous carbonating zone above said crystallization zone an atmosphere having at least 4% carbon dioxide;
Claim 13
Dependent Claim
45 words
The method of claim 1 wherein a second stream containing relatively fine crystals of sodium bicarbonate is removed from said carbonated mixture, said fine crystals are dissolved in said second stream and said second stream introduced onto the roof and walls of said carbonating zone.
Claim 14
Dependent Claim
18 words
maintaining in a contiguous carbonating zone above said crystallization zone an atmosphere having at least 4% carbon dioxide;
Claim 15
Dependent Claim
18 words
maintaining in a contiguous carbonating zone above said crystallization zone an atmosphere having at least 4% carbon dioxide;
Claim 16
Dependent Claim
18 words
MAINTAINING IN A CONTIGUOUS CARBONATING ZONE ABOVE SAID CRYSTALLIZATION ZONE AN ATMOSPHERE HAVING AT LEAST 4% CARBON DIOXIDE;
Claim 17
Dependent Claim
18 words
MAINTAINING IN A CONTIGUOUS CARBONATING ZONE ABOVE SAID CRYSTALLIZATION ZONE AN ATMOSPHERE HAVING AT LEAST 4% CARBON DIOXIDE;
Claim 18
Dependent Claim
42 words
SPRAYING SAID MIXTURE UPWARDLY AND INWARDLY INTO SAID ATMOSPHERE FROM THE PERIMETER OF SAID CARBONATING ZONE, THROUGH OPPOSED NOZZLE ADAPTED TO MAXIMIZE MID-AIR IMPINGEMENT OF SPRAYS EMINATING THEREFROM, REMOVING EVAPORATED WATER THEREFROM AND COLLECTING THE RESULTING CARBONATED MIXTURE IN SAID CRYSTALLIZATION ZONE;
Claim 19
Dependent Claim
42 words
SPRAYING SAID MIXTURE UPWARDLY AND INWARDLY INTO SAID ATMOSPHERE FROM THE PERIMETER OF SAID CARBONATING ZONE, THROUGH OPPOSED NOZZLE ADAPTED TO MAXIMIZE MID-AIR IMPINGEMENT OF SPRAYS EMINATING THEREFROM, REMOVING EVAPORATED WATER THEREFROM AND COLLECTING THE RESULTING CARBONATED MIXTURE IN SAID CRYSTALLIZATION ZONE;
Claim 20
Dependent Claim
42 words
spraying said mixture upwardly and inwardly into said atmosphere from the perimeter of said carbonating zone, through opposed nozzles adapted to maximize mid-air impingement of sprays eminating therefrom, removing evaporated water therefrom and collecting the resulting carbonated mixture in said crystallization zone;
Claim 21
Dependent Claim
42 words
spraying said mixture upwardly and inwardly into said atmosphere from the perimeter of said carbonating zone, through opposed nozzles adapted to maximize mid-air impingement of sprays eminating therefrom, removing evaporated water therefrom and collecting the resulting carbonated mixture in said crystallization zone;
Claim 22
Dependent Claim
39 words
The method of claim 2 in which soda ash or caustic is introduced directly into said crystallization zone in amounts sufficient to substantially compensate for sodium carbonate converted to sodium bicarbonate and removed as product and maintain said equilibrium.
Claim 23
Dependent Claim
37 words
collecting said mixture in a classification zone and classifying said mixture into an upper portion having relatively fine crystals of sodium bicarbonate suspended therein and a lower portion having relatively coarser crystals of sodium bicarbonate suspended therein;
Claim 24
Dependent Claim
37 words
collecting said mixture in a classification zone and classifying said mixture into an upper portion having relatively fine crystals of sodium bicarbonate suspended therein and a lower portion having relatively coarser crystals of sodium bicarbonate suspended therein;
Claim 25
Dependent Claim
17 words
The process of claim 2 in which said second stream is fortified with soda ash or caustic.
Claim 26
Dependent Claim
14 words
removing from said carbonated mixture an aqueous stream containing suspended crystals of sodium bicarbonate;
Claim 27
Dependent Claim
14 words
removing from said carbonated mixture an aqueous stream containing suspended crystals of sodium bicarbonate;
Claim 28
Dependent Claim
14 words
REMOVING FROM SAID CARBONATED MIXTURE AN AQUEOUS STREAM CONTAINING SUSPENDED CRYSTALS OF SODIUM BICARBONATE;
Claim 29
Dependent Claim
14 words
REMOVING FROM SAID CARBONATED MIXTURE AN AQUEOUS STREAM CONTAINING SUSPENDED CRYSTALS OF SODIUM BICARBONATE;
Claim 30
Dependent Claim
52 words
removing a portion of said mixture from said classification zone and spraying the same upwardly and inwardly into said atmosphere from the perimeter of said carbonating zone thRough nozzles adapted to maximize mid-air impingement of sprays eminating therefrom, removing evaporated water therefrom and collecting the resulting carbonated mixture in said crystallization zone;
Claim 31
Dependent Claim
52 words
removing a portion of said mixture from said classification zone and spraying the same upwardly and inwardly into said atmosphere from the perimeter of said carbonating zone thRough nozzles adapted to maximize mid-air impingement of sprays eminating therefrom, removing evaporated water therefrom and collecting the resulting carbonated mixture in said crystallization zone;
Claim 32
Dependent Claim
15 words
removing from said classification zone in an aqueous stream containing suspended crystals of sodium bicarbonate;
Claim 33
Dependent Claim
15 words
removing from said classification zone in an aqueous stream containing suspended crystals of sodium bicarbonate;
Claim 34
Dependent Claim
18 words
SEPARATING SAID CRYSTALS AS PRODUCT FROM SAID AQUEOUS STREAM AND RECYCLING THE RESULTANT MOTHER LIQUOR TO SAID ABSORBER-CRYSTALLIZER.
Claim 35
Dependent Claim
18 words
SEPARATING SAID CRYSTALS AS PRODUCT FROM SAID AQUEOUS STREAM AND RECYCLING THE RESULTANT MOTHER LIQUOR TO SAID ABSORBER-CRYSTALLIZER.
Claim 36
Dependent Claim
18 words
separating said crystals as product from said aqueous stream and recycling the resultant mother liquor to said absorber-crystallizer.
Claim 37
Dependent Claim
18 words
separating said crystals as product from said aqueous stream and recycling the resultant mother liquor to said absorber-crystallizer.
Claim 38
Dependent Claim
52 words
The process of claim 4 in which supplemental soda ash or caustic is introduced directly into said crystallization zone in amounts which, when added to amounts added to said second stream, are sufficient to substantially compensate for sodium carbonate converted to sodium bicarbonate and removed as product and to maintain said equilibrium.
Claim 39
Independent Claim
20 words
A method for producing sodium bicarbonate by carbonating sodium carbonate in an absorber-crystallizer to precipitate sodium bicarbonate crystals which comprises:
Claim 40
Independent Claim
20 words
A method for producing sodium bicarbonate by carbonating sodium carbonate in an absorber-crystallizer to precipitate sodium bicarbonate crystals which comprises:
Claim 41
Dependent Claim
18 words
separating said crystals from said aqueous stream as product and recycling the resultant mother liquor to said absorber-crystallizer.
Claim 42
Dependent Claim
18 words
separating said crystals from said aqueous stream as product and recycling the resultant mother liquor to said absorber-crystallizer.
Claim 43
Dependent Claim
65 words
The process of claim 6 in which a second stream containing said relatively fine crystals of sodium bicarbonate is removed from said upper portion, said relatively fine crystals are dissolved in said second stream and said second stream is sprayed into an upper region of said carbonating zone to impinge on the roof and walls thereof to provide a flow of unsaturated feed solution thereover.
Claim 44
Dependent Claim
44 words
The process of claim 7 in which sodium carbonate or aqueous sodium hydroxide is introduced directly into said crystallization zone in amounts sufficient to substantially compensate for sodium carbonate converted to sodium bicarbonate and removed as product and to maintain said mixture in equilibrium.
Claim 45
Dependent Claim
37 words
The process of claim 7 in which said second stream is fortified with sodium carbonate or aqueous sodium hydroxide to provide a flow of fortified unsaturated feed solution over the roof and walls of the carbonation zone.
Claim 46
Dependent Claim
55 words
The process of claim 9 in which supplemental sodium carbonate or aqueous sodium hydroxide are introduced directly into said crystallization zone in amounts which, added to amounts added to said second stream are sufficient to substantially compensate for sodium carbonate converted to sodium bicarbonate and removed as product and to maintain said mixture in equilibrium.
Claim 47
Dependent Claim
37 words
The process of claim 6 wherein the mixture removed from said classification zone and sprayed into said carbonation zone is removed from a lower portion of said classification zone and contains relatively coarse crystals of sodium bicarbonate.
Claim 48
Dependent Claim
60 words
The process of claim 11 in which a second stream containing said relatively fine crystals of sodium bicarbonate is removed from said upper portion, said relatively fine crystals are dissolved in said second stream and said second stream is sprayed into said carbonating zone to contact the walls and roof thereof to form a flow of unsaturated feed solution thereover.
Claim 49
Dependent Claim
44 words
The process of claim 12 in which sodium carbonate or aqueous sodium hydroxide is introduced directly into said crystallization zone in amounts sufficient to substantially compensate for sodium carbonate converted to sodium bicarbonate and removed as product and to maintain said mixture in equilibrium.
Claim 50
Dependent Claim
37 words
The process of claim 12 in which said second stream is fortified with sodium carbonate or aqueous sodium hydroxide to provide a flow of fortified unsaturated feed solution over the roof and walls of the carbonation zone.
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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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |