EP0048110A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Selective retention with composite materials
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1981-09-02
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Granted: —
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Expires: 2001-09-02
Abstract
Abstract The present invention relates to composite materials. A composite material is disclosed for the selective retention of chemical species from a fluid substance. The composite material comprises a support material, a permeable gel retained on the support material and, in the permeable gel, an active material capable of selectively retaining the chemical species. At least some of the permeable gel is enmeshed with the support material. A method for the preparation of the composite material is also disclosed.
Inventors
- 👤 Alan Rosevear
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 22:14
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/281; B01J20/291; B01J20/28; B01J20/28014; B01J20/28026; B01J20/28033; B01J20/28047; B01J2220/00; B01J2220/50; B01J2220/54
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
106 words
A method for the preparation of a composite material for the selective retention of chemical species from a fluid containing said chemical species characterised by applying a gel precursor to a support material, said gel precursor containing an active material capable of selectively retaining the chemical species, and gelling the gel precursor to form a composite material comprising the support material, a permeable gel retained on the support material, and, in the permeable gel, the active material, the active material being retained and distributed in the permeable gel on the support material and at least some of the permeable gel being enmeshed with the support material.
Claim 2
Independent Claim
106 words
A method for the preparation of a composite material for the selective retention of chemical species from a fluid containing said chemical species characterised by applying a gel precursor to a support material, said gel precursor containing an active material capable of selectively retaining the chemical species, and gelling the gel precursor to form a composite material comprising the support material, a permeable gel retained on the support material, and, in the permeable gel, the active material, the active material being retained and distributed in the permeable gel on the support material and at least some of the permeable gel being enmeshed with the support material.
Claim 3
Dependent Claim
44 words
A method as claimed in claim 1 wherein the rheological properties of the gel precursor are chosen to facilitate retention thereof on the support material prior to and during the gelling and/or to inhibit sedimentation of the active material prior to, and during, gelling.
Claim 4
Dependent Claim
24 words
A method as claimed in claim 1 or claim 2 wherein the g el precursor comprises the active material and a gel forming material.
Claim 5
Dependent Claim
30 words
A method as claimed in claim 3 wherein the gel precursor contains a gel forming material which is a polymerisable material and gelling is effected by polymerising said polymerisable material.
Claim 6
Dependent Claim
18 words
A method as claimed in claim 4 wherein gelling is effected by cross-linking of the gel forming material.
Claim 7
Dependent Claim
30 words
A method as claimed in claim 4 wherein the gel precursor contains an organic polymeric material capable of setting to a gel on cooling and gelling is effected by cooling.
Claim 8
Independent Claim
20 words
A method as claimed in any one of the preceding claims wherein the gel precursor contains a viscosity enhancing agent.
Claim 9
Dependent Claim
41 words
A method as claimed in claim 8 wherein the viscosity enhancing agent is an aqueous solution or a hydrocolloid suspension of xanthan gum, sodium alginate, carboxymethyl cellulose-sodium salt, cellulose ether, polyvinvyl alcohol, agarose, cold water soluble starch, cellulose paste or carrageenam.
Claim 10
Independent Claim
26 words
A method as claimed in any one of the preceding claims wherein the active material has ion exchange properties, gel permeation properties or gel filtration properties.
Claim 11
Dependent Claim
28 words
A method as claimed in claim 9 wherein the active material is an alumino silicate, zinc oxide, titania, hycroxylaptite or an ion exchanger based on a carbohydrate back-bone.
Claim 12
Independent Claim
35 words
A method as claimed in any one of the preceding claims wherein the support material is nylon mesh, steel mesh, loosely woven cloth, porous particles, thin section sponge, roughened metal plate or a ceramic surface.
Claim 13
Dependent Claim
80 words
A composite material for the selective retention of chemical species from a fluid substance containing said chemical species which composite material is characterised by comprising a support material, a permeable gel retained on the support material and, in the permeable gel, an active material capable of selectively retaining the chemical species, the active material being retained and distributed in the permeable gel on the support material and at least some of the permeable gel being enmeshed with the support material.
Claim 14
Dependent Claim
80 words
A composite material for the selective retention of chemical species from a fluid substance containing said chemical species which composite material is characterised by comprising a support material, a permeable gel retained on the support material and, in the permeable gel, an active material capable of selectively retaining the chemical species, the active material being retained and distributed in the permeable gel on the support material and at least some of the permeable gel being enmeshed with the support material.
Claim 15
Independent Claim
47 words
A method for the selective retention of chemical species from a fluid substance containing said chemical species which comprises contacting a fluid containing chemical species to be selectively retained with a composite material prepared by a method as claimed in any one of claims 1 to 11.
References Cited (Backward Citations)
No citation records indexed.
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