US4261832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membranes with preselected pore types for separation processes
Assignee: Bergwerksverband GmbH
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Filing: 1978-06-06
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Granted: 1981-04-14
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Expires: 1998-06-06
Abstract
Abstract A membrane having a preselected pore type which is suited for separating processes comprising a shaped body formed by heating a mixture of finely ground carbonaceous material with a binder composed of about 5 to 20% by weight natural or synthetic elastomer or a mixture of both and of about 1 to 20% by weight of thermoplastic material to about 400° to 1400° C. in an inert atmosphere at a rate of temperature increase between 0.1° and 10° C./min. The membranes are useful for a wide range of selective chemical and physical separation operations of different materials.
Inventors
- 👤 Horst Schumacher
- 👤 Harald Juntgen
- 👤 Ernst Preuss
- 👤 Dieter Zundorf
- 👤 Werner Hodek
- 👤 Ingo Romey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:30
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/04; B01D69/046; B01D71/00; B01D71/02; B01D71/021; B01D2323/00; B01D2323/08; B01D2323/081; B01D2323/12; B01D2325/00; B01D2325/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
100 words
A membrane adapted for use in selective separation processes and having a predetermined pore size consisting essentially of a finely divided coke-like frame-work and having been formed by heating a shaped body composed of a mixture of (a) a finely ground carbonaceous material, (b) about 5-20% by weight of at least one member selected from the group consisting of natural and synthetic elastomers, and (c) about 1-20% by weight of a thermoplastic material to a temperature of about 400° to 1400° C. in an inert atmosphere at a rate of temperature increase of between 0.1° and 10° C. per minute.
Claim 2
Dependent Claim
100 words
A membrane adapted for use in selective separation processes and having a predetermined pore size consisting essentially of a finely divided coke-like frame-work and having been formed by heating a shaped body composed of a mixture of (a) a finely ground carbonaceous material, (b) about 5-20% by weight of at least one member selected from the group consisting of natural and synthetic elastomers, and (c) about 1-20% by weight of a thermoplastic material to a temperature of about 400° to 1400° C. in an inert atmosphere at a rate of temperature increase of between 0.1° and 10° C. per minute.
Claim 3
Dependent Claim
28 words
A membrane according to claim 1 wherein said carbonaceous material is selected from the group consisting of mineral coal, lignite, charcoal, peat coke and lignite low temperature coke.
Claim 4
Dependent Claim
26 words
A membrane according to claim 1 in the form of a pressure-made tube, tubing, foil or disc having wall thickness of between 0.1 and 5 mm.
Claim 5
Dependent Claim
30 words
A membrane according to claim 1 which resists pressure in excess of 10 bar at a wall thickness below 1 mm and in the absence of any external supporting material.
Claim 6
Dependent Claim
23 words
A membrane according to claim 1 wherein the elastomer is member selected from the group consisting of a butadiene-acrylonitrile mixed polymerizate and polyisobutylene.
Claim 7
Dependent Claim
28 words
A membrane according to claim 1 wherein the thermoplastic material is a member selected from the group consisting of high pressure polyethylene, low pressure polyethylene and polyvinyl alcohol.
Claim 8
Dependent Claim
86 words
The process of making a membrane according to claim 1 comprising mixing (a) a finely ground carbonaceous material, (b) about 5-20% by weight of at least one member selected from the group consisting of natural and synthetic elastomers, and (c) about 1-20% by weight of a thermoplastic material, subjecting the resultant mixture to shaping, and thereafter subjecting the shaped mixture to heating at a temperature of 400° to 1400° C. in an inert atmosphere at a rate of temperature increase of between 0.1° and 10° C./min.
Claim 9
Dependent Claim
23 words
The process of claim 7 wherein the elastomer is a member selected from the group consisting of a butadiene-acrylonitrile mixed polymerizate and polyisobutylene.
Claim 10
Dependent Claim
27 words
The process of claim 7 wherein the thermoplastic material is a member selected from the group consisting of high pressure polyethylene, low pressure polyethylene and polyvinyl alcohol.
Claim 11
Dependent Claim
23 words
The process of claim 7 wherein the shaping is effected under pressure sufficient to provide a wall thickness of 0.1 to 5 mm.
Claim 12
Dependent Claim
31 words
The process of claim 7 wherein said mixture comprises 70 to 90 parts by weight of an elastomer and 1 to 20 parts by weight of a thermoplastic material as binder.
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) | 1984-04-13 | 1984-10-13 | 1985-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-13 | 1988-10-13 | 1989-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-13 | 1992-10-13 | 1993-04-14 | $7700.00 | Window Closed / Lapsed |