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US4844809A
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Method for purifying reaction solution obtained by using microbial cell, immobilized microbial cell, or immobilized enzyme
Assignee: Mitsubishi Chemical Corp
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Filing: 1985-11-18
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Granted: 1989-07-04
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Expires: 2005-11-18
Abstract
Abstract A method for purifying a reaction solution obtained by using a microbial cell, an immobilized microbial cell, or an immobilized enzyme as a catalyst in a water medium is disclosed. The method comprises repeatedly filtering the reaction solution to remove fine solid matter using a polyethylene porous hollow fiber membrane having a bubble point of from 1 to 20 kg/cm2, and repeatedly washing the hollow fiber membrane before it has been clogged to such an extent that a differential pressure thereof exceeds 3 kg/cm2. By this method, a filter membrane can be repeatedly regenerated at high efficiency and can stably be used for a long period of time.
Inventors
- 👤 Ashina Yoshiro
- 👤 Yasumasa Yamaguchi
- 👤 Masashi Nishida
- 👤 Toshiaki Doi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:46
CPC Classifications
C; C12; C12P; C12P13/00; C12P13/02; B; B01; B01D; B01D61/00; B01D61/14; B01D63/00; B01D63/02; B01D65/00; B01D65/02; B01D71/00; B01D71/06; B01D71/26; B01D71/261; C12P1/00; B01D2321/00; B01D2321/04; B01D2321/16; B01D2321/164
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
85 words
A method for purifying a reaction solution obtained by using a microbial cell, an immobilized microbial cell, or an immobilized enzyme as a catalyst in a water medium, which comprises repeatedly filtering the reaction solution to remove fine solid matter using a polyethylene porous hollow fiber membrane having a bubble point of from 1 to 20 kg/cm 2 , and repeatedly washing the hollow fiber membrane before it has been clogged to such an extent that a differential pressure thereof exceeds 3 kg/cm 2 .
Claim 2
Independent Claim
85 words
A method for purifying a reaction solution obtained by using a microbial cell, an immobilized microbial cell, or an immobilized enzyme as a catalyst in a water medium, which comprises repeatedly filtering the reaction solution to remove fine solid matter using a polyethylene porous hollow fiber membrane having a bubble point of from 1 to 20 kg/cm 2 , and repeatedly washing the hollow fiber membrane before it has been clogged to such an extent that a differential pressure thereof exceeds 3 kg/cm 2 .
Claim 3
Dependent Claim
15 words
A method as in claim 1, wherein said washing is a back washing with water.
Claim 4
Dependent Claim
18 words
A method as in claim 1, wherein the method further includes alkali-treatment of the clogged hollow fiber membrane.
Claim 5
Dependent Claim
15 words
A method as in claim 1, wherein the reaction solution is an aqueous acrylamide solution.
Claim 6
Dependent Claim
30 words
A method as in claim 1, wherein the porous hollow fiber membrane has a diameter of from 0.3 to 1 mm and a length of from 40 to 200 cm.
Claim 7
Dependent Claim
52 words
A method as in claim 1, wherein the porous hollow fiber membrane has a bubble point of from 2 to 8 kg/cm 2 , and the hollow fiber membrane is washed when it has been clogged to such an extent that the differential pressure is from 0.7 to 1.2 kg/cm 2 .
Claim 8
Dependent Claim
15 words
A method as in claim 6, wherein said washing is a back washing with water.
Claim 9
Dependent Claim
18 words
A method as in claim 6, wherein the method further includes alkali-treatment of the clogged hollow fiber membrane.
Claim 10
Dependent Claim
15 words
A method as in claim 6, wherein the reaction solution is an aqueous acrylamide solution.
Claim 11
Dependent Claim
30 words
A method as in claim 6, wherein the porous hollow fiber membrane has a diameter of from 0.3 to 1 mm and a length of from 40 to 200 cm.
Claim 12
Dependent Claim
25 words
A method as in claim 1, wherein the back washing is carried out at a differential pressure of from 1 to 10 kg/cm 2 .
Claim 13
Dependent Claim
25 words
A method as in claim 6, wherein the back washing is carried out at a differential pressure of from 1 to 10 kg/cm 2 .
Claim 14
Dependent Claim
28 words
A method as in claim 3, wherein the alkali-treatment is carried out with an aqueous sodium hydroxide solution at a concentration of from 2 to 30% by weight.
Claim 15
Dependent Claim
28 words
A method as in claim 8, wherein the alkali-treatment is carried out with an aqueous sodium hydroxide solution at a concentration of from 2 to 30% by weight.
Claim 16
Dependent Claim
21 words
A method as in claim 13, wherein the alkali-treatment is carried out for a period of from 0.1 to 100 hours.
Claim 17
Dependent Claim
21 words
A method as in claim 14, wherein the alkali-treatment is carried out for a period of from 0.1 to 100 hours.
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) | 1992-07-03 | 1993-01-02 | 1993-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-03 | 1997-01-02 | 1997-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-03 | 2001-01-02 | 2001-07-04 | $7700.00 | Window Closed / Lapsed |