US3644089A
Expired / Lapsed
US
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Preparation of sodium carbonate
Assignee: Bayer AG
•
Filing: 1969-11-25
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Granted: 1972-02-22
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Expires: 1989-11-25
Abstract
Abstract Preparation of sodium carbonate monohydrate by reacting caustic soda solution of a concentration of 10 to 70 percent and carbon dioxide in the presence of solid sodium carbonate at temperatures of 80* to 115* C. the caustic soda solution and the carbon dioxide are continuously reacted in an aqueous sodium-carbonatecontaining slurry at a pH-value of 11.3 to 11.5. By driving off the water fed in together with the caustic soda solution and by withdrawing a portion of the slurry, from which the sodium carbonate monohydrate formed in the reaction is recovered a sodium carbonate solid concentration of about 100 to 600 g./l. is maintained in the slurry.
Inventors
- 👤 Franz-Rudolf Minz
- 👤 Eberhard Zirngiebl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:07
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
18 words
Process according to claim 1, wherein the water introduced with the caustic soda solution is evaporated by heat.
Claim 2
Dependent Claim
25 words
Process according to claim 1, wherein the water introduced with the caustic soda solution is removed by excess CO2, an inert gas or mixtures thereof.
Claim 3
Dependent Claim
18 words
Process according to claim 3, wherein a portion of the introduced water is removed through evaporation by heat.
Claim 4
Dependent Claim
21 words
Process according to claim 1, wherein the reaction is carried out at elevated CO2 partial pressures of up to 2 atmospheres.
Claim 5
Dependent Claim
21 words
Process according to claim 1, wherein the sodium carbonate monohydrate solids concentration in the slurry amounts to 200 to 400 g./l.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |