US4711722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing fouling of electrodialysis membrane
Assignee: Ajinomoto Co Inc
•
Filing: 1986-01-27
•
Granted: 1987-12-08
•
Expires: 2006-01-27
Abstract
Abstract A method for preventing fouling of an electrodialysis membrane when conducting desalting of an inorganic salt-containing aqueous solution containing electrodialysis membrane-fouling substances, which is characterized by adjusting the pH of the solution to the isoelectric points of the fouling substances.
Inventors
- 👤 Seiji Toyoshi
- 👤 Tomoya Yoshizumi
- 👤 Masaru Saeki
- 👤 Tetsuya Kawakita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:03
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/52; A; A23; A23C; A23C9/00; A23C9/14; A23C9/144; C; C13; C13B; C13B20/00; C13B20/18; B01D2311/00; B01D2311/04; B01D2321/00; B01D2321/16; B01D2321/162; Y; Y02; Y02A; Y02A20/00; Y02A20/124
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
128 words
In a method of preventing fouling of an electrodialysis membrane during desalting by membrane electrodialysis of a fermentation liquor comprising an inorganic salt and an amphoteric electrodialysis membrane fouling substance, wherein the fermentation liquor is obtained from molasses selected from the group consisting of cane molasses and beet molasses, and contains material of isoelectric point within the range of pH 3-4 as the amphoteric electrodialysis membrane fouling substance, the improvement consisting of: (a) adjusting the pH of the solution to about the isoelectric point of the fouling substance prior to desalting to produce a pH adjusted fermentation liquor and thereafter, (b) subjecting the pH adjusted fermentation liquor retaining the electrodialysis membrane-fouling substances in a non-charged state to the electrodialysis desalting procedure, and (c) recovering a desalted fermentation liquor.
Claim 2
Dependent Claim
128 words
In a method of preventing fouling of an electrodialysis membrane during desalting by membrane electrodialysis of a fermentation liquor comprising an inorganic salt and an amphoteric electrodialysis membrane fouling substance, wherein the fermentation liquor is obtained from molasses selected from the group consisting of cane molasses and beet molasses, and contains material of isoelectric point within the range of pH 3-4 as the amphoteric electrodialysis membrane fouling substance, the improvement consisting of: (a) adjusting the pH of the solution to about the isoelectric point of the fouling substance prior to desalting to produce a pH adjusted fermentation liquor and thereafter, (b) subjecting the pH adjusted fermentation liquor retaining the electrodialysis membrane-fouling substances in a non-charged state to the electrodialysis desalting procedure, and (c) recovering a desalted fermentation liquor.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein the fouling substance is selected from the group consisting of proteins, dyes and humic substances.
Claim 4
Dependent Claim
50 words
The process of claim 1 wherein the fermentation liquor is a glutamic acid fermentation liquor and glutamic acid is separated from the fermentation liquor after the pH adjustment (a) and prior to the desalting procedure (b), while retaining the electrodialysis membrane-fouling substance in the non-charged state in the fermentation liquor.
References Cited (Backward Citations)
US4492601A
Cited
US4523999A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-07 | 1991-06-08 | 1991-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-07 | 1995-06-08 | 1995-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-07 | 1999-06-08 | 1999-12-08 | $7700.00 | Window Closed / Lapsed |