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US4802965A
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Concentrating aqueous solutions of organic compounds which contain salts, with simultaneous reduction of the salt content
Assignee: BASF SE
•
Filing: 1985-12-16
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Granted: 1989-02-07
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Expires: 2005-12-16
Abstract
Abstract Aqueous solutions of organic compounds which contain salts are concentrated by electrodialysis with simultaneous reduction of the salt content of these solutions, the concentrate used being an aqueous salt solution which is not less than 1 molar.
Inventors
- 👤 Hermann Puetter
- 👤 Eckhard Roske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:00
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; C; C07; C07H; C07H1/00; C07H1/06; C07H3/00; C07H3/02; C09; C09B; C09B67/00; C09B67/0096; B01D2311/00; B01D2311/10; Y; Y02; Y02A; Y02A20/00; Y02A20/124
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
58 words
In a process for concentrating an aqueous solution of an organic compound which contains a salt, with simultaneous reduction of the salt content of this solution, the improvement which comprises: subjecting the salt-containing aqueous solution of the organic compound as the diluate to electrodialysis, using a concentrate of an aqueous salt solution which is greater than 1 molar.
Claim 2
Dependent Claim
58 words
In a process for concentrating an aqueous solution of an organic compound which contains a salt, with simultaneous reduction of the salt content of this solution, the improvement which comprises: subjecting the salt-containing aqueous solution of the organic compound as the diluate to electrodialysis, using a concentrate of an aqueous salt solution which is greater than 1 molar.
Claim 3
Dependent Claim
24 words
A process as claimed in claim 1, wherein the concentrate used is an aqueous alkali metal sulfate solution which is greater than 1 molar.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 1, wherein the concentrate used is an aqueous alkali metal chloride or bromide solution which is not less than 3 molar.
Claim 5
Dependent Claim
21 words
A process as claimed in claim 1, wherein the concentrate used is a salt solution which is saturated at room temperature.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 1, wherein the salt used for the concentrate is a water-soluble halide, sulfide, sulfite, sulfate, carbonate, formate or acetate.
Claim 7
Dependent Claim
36 words
A process as claimed in claim 1, wherein the salt used for the concentrate is LiCl, KCl, NaCl, NH 4 Cl, Li 2 SO 4 , K 2 SO 4 or Na 2 SO 4 .
Claim 8
Dependent Claim
18 words
A process as claimed in claim 1, wherein electrodialysis is carried out at no higher than 80° C.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 1, wherein the organic compound is electrically neutral and has a molecular weight of not less than about 60.
Claim 10
Dependent Claim
26 words
A process as claimed in claim 1, wherein the organic compound is an ionic substance and has a molecular weight of not less than about 120.
Claim 11
Dependent Claim
26 words
A process as claimed in claim 1, wherein the organic compound is an ionic monomeric organic compound having a molecular weight of from 200 to 2,000.
Claim 12
Dependent Claim
27 words
A process as claimed in claim 1, wherein the organic compound is a water-soluble oligomer or polymer having a molecular weight of from 2,000 to 2 million.
Claim 13
Dependent Claim
34 words
A process as claimed in claim 1, wherein the aqueous solution contains not more than 50% by weight of the organic compound and has a salt content of not more than 30% by weight.
Claim 14
Dependent Claim
54 words
A process as claimed in claim 1, wherein the electrodialysis is carried out at a temperature of not more than 100° C., using a current density of 10 to 0.01 A/dm 2 and a cell voltage of from 0.5 to 2V per subcell, each subcell consisting of a diluate chamber and a concentrate chamber.
Claim 15
Dependent Claim
20 words
A process as claimed in claim 13, wherein the current density used is from 5 to 0.05 A/dm 2 .
Claim 16
Dependent Claim
22 words
A process as claimed in claim 13 wherein the electrodialysis is carried out at a temperature of from 15° to 80° C.
Claim 17
Dependent Claim
22 words
A process as claimed in claim 14 wherein the electrodialysis is carried out at a temperature of from 15° to 80° C.
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |