Patent US759062A successfully refreshed from Google Patents.
Patent US284643A successfully refreshed from Google Patents.
Patent US4039618A successfully refreshed from Google Patents.
US4039618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sodium carbonate crystallizer mother liquors
Assignee: Honeywell International Inc
•
Filing: 1975-06-17
•
Granted: 1977-08-02
•
Expires: 1995-06-17
Abstract
Abstract In the process for making sodium carbonate from trona, the soluble silicate content of crystallizer mother liquor from which sodium carbonate precursor crystals are obtained by evaporative crystallization is reduced by digesting the mother liquor at elevated temperature in the presence of certain activated insolubles, followed by separating the insolubles from the digested mother liquor. These activated insolubles are obtained by calcining crushed trona, dissolving the calcined trona in an aqueous medium to obtain a solution of sodium carbonate containing insolubles, separating the insolubles and activating them by calcination at elevated temperature.
Inventors
- 👤 Alan B. Gancy
- 👤 Rustom P. Poncha
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:26
CPC Classifications
C; C01; C01D; C01D7/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
The method for treating aqueous carbonate process crystallizer mother liquor from the process for making sodium carbonate precursor crystals by evaporative crystallization which comprises: a. digesting said mother liquor at elevated temperature, for time sufficient to reduce soluble silicates, in the presence as treating agent of activated insolubles which have been obtained by calcining of crushed trona, dissolution of the crushed trona in a aqueous medium to obtain a solution comprising sodium carbonate and insolubles, separating the insolubles from the solution and activating the separated insolubles by calcining at temperature of 300° to below 600° C., and b. separating the insolubles from the digested mother liquor.
Claim 2
Independent Claim
106 words
The method for treating aqueous carbonate process crystallizer mother liquor from the process for making sodium carbonate precursor crystals by evaporative crystallization which comprises: a. digesting said mother liquor at elevated temperature, for time sufficient to reduce soluble silicates, in the presence as treating agent of activated insolubles which have been obtained by calcining of crushed trona, dissolution of the crushed trona in a aqueous medium to obtain a solution comprising sodium carbonate and insolubles, separating the insolubles from the solution and activating the separated insolubles by calcining at temperature of 300° to below 600° C., and b. separating the insolubles from the digested mother liquor.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein the insolubles have been activated by calcining at temperature between about 400° C. and about 550° C.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein the mother liquor is digested at temperature of from about 185° to about 210° F.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein the mother liquor is digested for time period of from about 30 minutes to about 8 hours.
Claim 6
Dependent Claim
31 words
The method of claim 4 wherein the insolubles are employed in amount of about 5 to about 20 percent by weight, based on the combined weight of mother liquor and insolubles.
Claim 7
Dependent Claim
17 words
The method of claim 2 wherein the mother liquor is digested at temperature above about 160° F.
Claim 8
Dependent Claim
33 words
The method of claim 1 wherein the mother liquor is digested at temperature of from about 185° to about 210° F. for time period of from about 30 minutes to about 8 hours.
Claim 9
Dependent Claim
30 words
The method of claim 7 wherein the insolubles use employed in amount of about 5 to 20 percent by weight, based on the combined weight of mother liquor and insolubles.
Claim 10
Dependent Claim
17 words
The method of claim 1 wherein the mother liquor is digested at temperature above about 160° F.
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) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |