US3653848A
Expired / Lapsed
US
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Crystallization process
Assignee: Henley Group Inc
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Filing: 1968-09-04
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Granted: 1972-04-04
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Expires: 1988-09-04
Abstract
Abstract Invention relates to the preparation of sodium carbonate precursor crystals, such as sodium bicarbonate, sodium sesquicarbonate, anhydrous sodium carbonate and sodium carbonate monohydrate by a crystallization process which involves forming a first crop of said precursor crystals from a substantially saturated carbonate process solution and subjecting the mother liquor separated from the first crop of precursor crystals to crystallization, including a crystallization temperature higher than that employed to obtain the first crop of said precursor crystals, to effect formation of a second crop of precursor crystals.
Inventors
- 👤 Eugene B Port
- 👤 Carlton J Howard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:17
CPC Classifications
C; C01; C01D; C01D7/00; C01D7/22; C01D7/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
12 words
The process of claim 1, wherein the precursor crystals are sodium sesquicarbonate.
Claim 2
Dependent Claim
12 words
The process of claim 1 wherein the precursor crystals are sodium bicarbonate.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the precursor crystals are sodium carbonate monohydrate.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the precursor crystals are anhydrous sodium carbonate.
Claim 5
Dependent Claim
27 words
The process of claim 4 wherein crystallization of sodium carbonate monohydrate is effected at a temperature within the range of about 36* C. to about 109* C.
Claim 6
Dependent Claim
18 words
The process of claim 5 wherein crystallization is effected at a temperature in excess of about 109* C.
Claim 7
Dependent Claim
35 words
The process of claim 1 wherein said second crystallization is effected at a temperature from about 5* to 70* C. above the crystallization temperature in the crystallizer to which the carbonate process solution is fed.
Claim 8
Dependent Claim
45 words
The process of claim 1 wherein crystallization is effected in a multiple effect crystallization system containing three crystallizers, said first crystallization being effected in the second and third effects of said system and said second crystallization being effected in the first effect of said system.
Claim 9
Dependent Claim
39 words
The process of claim 9 wherein said first crystallization is effected at a temperature ranging from about 36* C. to about 99* C. and said second crystallization being effected at a temperature ranging from about 70* to 109* C.
Claim 10
Dependent Claim
26 words
The process of claim 9 wherein said first crystallization in the second effect crystallizer is conducted at a temperature ranging from about 53* to 99* C.
Claim 11
Dependent Claim
26 words
The process of claim 9 wherein said first crystallization in the third effect crystallizer is conducted at a temperature ranging from about 36* to 85* C.
Claim 12
Dependent Claim
19 words
The process of claim 1 wherein said precursor crystals separated from the mother liquor are converted to sodium carbonate.
Claim 13
Dependent Claim
21 words
The process of claim 13 wherein said sodium carbonate has a bulk density in excess of about 950 grams per liter.
Claim 14
Dependent Claim
21 words
The process of claim 9 wherein the carbonate process solution is fed in parallel to the second and third effect crystallizers.
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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |