EP0069523A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Concentration of aqueous pseudoplastic solutions by membrane ultrafiltration
Assignee: Pfizer Inc
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Filing: 1982-06-29
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Granted: —
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Expires: 2002-06-29
Abstract
Abstract A method of concentrating an aqueous, highly-pseudoplastic biopolymer solution or preconcentrate having an apparent viscosity of at least about 3,000 centipoise comprising subjecting said solution or preconcentrate to membrane ultrafiltration at a linear flow velocity of at least about 40 cm/sec across said membrane surface, while exerting an average pressure differential across said membrane of at least about 2.0 atmospheres.
Inventors
- 👤 Lewis Ho
- 👤 Roy Jasper Taylor
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 17:10
CPC Classifications
C; C12; C12P; C12P19/00; C12P19/04; C12P19/06; B; B01; B01D; B01D61/00; B01D61/14; B01D61/145; B01D61/18; B01D63/00; B01D63/06; B01D63/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
60 words
A method of concentrating an aqueous, highly pseudoplastic biopolymer solution or preconcentrate having an apparent viscosity of at least 3000 centipoise comprising subjecting said solution or preconcentrate to membrane ultrafiltration at a linear flow velocity of at least about 40 cm/sec across said membrane surface while exerting an average pressure differential across said membrane of at least about 2.0 atmospheres.
Claim 2
Independent Claim
60 words
A method of concentrating an aqueous, highly pseudoplastic biopolymer solution or preconcentrate having an apparent viscosity of at least 3000 centipoise comprising subjecting said solution or preconcentrate to membrane ultrafiltration at a linear flow velocity of at least about 40 cm/sec across said membrane surface while exerting an average pressure differential across said membrane of at least about 2.0 atmospheres.
Claim 3
Dependent Claim
16 words
The method of claim 1 in which said aqueous, highly pseudoplastic solution is a Xanthomonas biopolymer.
Claim 4
Independent Claim
22 words
The method of claims 1 or 2 in which the apparent viscosity of said solution is increased to at least 10,000 centipoise.
Claim 5
Independent Claim
15 words
The method of claims 1 or 2 in which said solution is a fermentation broth.
Claim 6
Dependent Claim
14 words
The method of claim 4 in which said broth is Xanthomonas campestris fermentation broth.
Claim 7
Independent Claim
19 words
The method of claims 1 or 2 in which the activity of said solution is concentrated at least 2-fold.
Claim 8
Independent Claim
20 words
The method of claims 1 or 2 in which said solution is maintained at a temperature of from about 20°-50°C.
References Cited (Backward Citations)
No citation records indexed.
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