GB2285951A - Semi-permeable membrane - Google Patents
Semi-permeable membrane Download PDFInfo
- Publication number
- GB2285951A GB2285951A GB9401102A GB9401102A GB2285951A GB 2285951 A GB2285951 A GB 2285951A GB 9401102 A GB9401102 A GB 9401102A GB 9401102 A GB9401102 A GB 9401102A GB 2285951 A GB2285951 A GB 2285951A
- Authority
- GB
- United Kingdom
- Prior art keywords
- semi
- permeable membrane
- absorbed
- membrane
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 18
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims abstract description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims abstract description 7
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 6
- 230000005526 G1 to G0 transition Effects 0.000 claims description 3
- 238000004817 gas chromatography Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims 2
- 239000007791 liquid phase Substances 0.000 claims 2
- 229920001223 polyethylene glycol Polymers 0.000 claims 2
- 229920000642 polymer Polymers 0.000 claims 1
- 239000000126 substance Substances 0.000 description 7
- 239000011148 porous material Substances 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 229920002379 silicone rubber Polymers 0.000 description 2
- 239000004945 silicone rubber Substances 0.000 description 2
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229940068918 polyethylene glycol 400 Drugs 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/38—Liquid-membrane separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/14—Dynamic membranes
- B01D69/141—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes
- B01D69/1411—Heterogeneous membranes, e.g. containing dispersed material; Mixed matrix membranes containing dispersed material in a continuous matrix
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/30—Polyalkenyl halides
- B01D71/32—Polyalkenyl halides containing fluorine atoms
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
A semi-permeable membrane comprising a thin sheet of microporous polytetrafluoroethylene with a non volatile material absorbed in the microporous sheet.
Description
SEMI-PERMEABLE MEMBRANES
Field of this Invention
This invention relates to semi-permeable membranes and the means of making such membranes.
Backaround of this Invention
Semi-permeable membranes are normally made of a solid material such as rubber or silicone rubber or plastic material.
An example of this is a semi-permeable membrane made of dimethyl silicone rubber. Semi-permeable membranes function by allowing diffusion of chemicals through them. The mechanism of diffusion requires the chemical to dissolve in the material of the membrane and to be emitted on the other side. An important feature of the function of the membrane is that the tendency to dissolve in the material of the membrane is specific for each chemical and may not be the same as other chemicals. Differences between tendency to dissolve and therefore diffusion rate allows the use of the semi-permeable membrane to alter the relative composition of components of mixtures of chemicals by diffusion through the membrane.
Summary of the Invention
According to the present invention a semi-permeable membrane is formed by absorbing a liquid or solid in the pores of a very thin sheet of microporous polytetrafluoroethylene. The property of the membrane to separate chemicals depends upon the tendency to dissolve in the liquid or solid held in the pores of the microporous sheet of polytetrafluoroethylene. The property of the semi-permeable membrane to alter relative chemical composition can be varied by absorbing different materials into the pores.
Detailed Description of the- Invention
A semi-permeable membrane is formed by absorbing a liquid or solid into the pores of a thin sheet of microporous polytetrafluoroethylene. The sheet may be any thickness up to 0.25mm . The liquid or solid absorbed can be any material with a low vapour pressure which will fill the pores and not evaporate.
The semi-permeable membrane so formed has the properties of the material absorbed. A specific example of such a material is polyethylene glycol 400. The material absorbed can be any material used as a "stationary phase" in the preparation of columns for gas chromatography.
Claims (4)
1. A semi-permeable membrane comprising a thin sheet of microporous polytetrafluoroethylene with a non volatile material absorbed in the sheet.
2. A semi-permeable membrane as claimed in Claim 1 where the material absorbed is any material used as a "stationary phase" in the preparation of a column for gas chromatography.
Amendments to the claims have been filed as follows
CLAIMS 1. A semi-permeable membrane comprising a thin sheet of microporous polytetrafluoroethylene with a non-volatile material absorbed in the sheet.
2. A semi-permeable membrane a claimed in claim 1 where the material absorbed is any material used as a stationary phase in the preparation of a column for gas chromatography.
3. A semi-permeable membrane as claimed in Claim 1 or Claim 2 where the material is in the liquid phase and remains in the liquid phase when absorbed in the PTFE membrane.
4. A semi-permeable membrane as claimed in Claim 1 or Claim 2 or
Claim 3 where the material is Polyethylene Glycol or a Polymer of Polyethylene Glycol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9401102A GB2285951A (en) | 1994-01-21 | 1994-01-21 | Semi-permeable membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9401102A GB2285951A (en) | 1994-01-21 | 1994-01-21 | Semi-permeable membrane |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9401102D0 GB9401102D0 (en) | 1994-03-16 |
| GB2285951A true GB2285951A (en) | 1995-08-02 |
Family
ID=10749101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9401102A Withdrawn GB2285951A (en) | 1994-01-21 | 1994-01-21 | Semi-permeable membrane |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2285951A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4194040A (en) * | 1969-04-23 | 1980-03-18 | Joseph A. Teti, Jr. | Article of fibrillated polytetrafluoroethylene containing high volumes of particulate material and methods of making and using same |
| EP0096991A1 (en) * | 1982-06-09 | 1983-12-28 | Imperial Chemical Industries Plc | Porous diaphragm for electrolytic cell |
| WO1987002267A1 (en) * | 1985-10-18 | 1987-04-23 | Chem-Elec, Inc. | Blood serum test strip |
| EP0273724A2 (en) * | 1986-12-30 | 1988-07-06 | Bend Research, Inc. | Acid gas scrubbing by composite solvent-swollen membranes |
| GB2235690A (en) * | 1989-07-12 | 1991-03-13 | Gore & Ass | Hydrophilic semi-permeable ptfe membranes |
| GB2255931A (en) * | 1991-05-24 | 1992-11-25 | Rogers Corp | Particular filled composite film and method for making same abstract |
-
1994
- 1994-01-21 GB GB9401102A patent/GB2285951A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4194040A (en) * | 1969-04-23 | 1980-03-18 | Joseph A. Teti, Jr. | Article of fibrillated polytetrafluoroethylene containing high volumes of particulate material and methods of making and using same |
| EP0096991A1 (en) * | 1982-06-09 | 1983-12-28 | Imperial Chemical Industries Plc | Porous diaphragm for electrolytic cell |
| WO1987002267A1 (en) * | 1985-10-18 | 1987-04-23 | Chem-Elec, Inc. | Blood serum test strip |
| EP0273724A2 (en) * | 1986-12-30 | 1988-07-06 | Bend Research, Inc. | Acid gas scrubbing by composite solvent-swollen membranes |
| GB2235690A (en) * | 1989-07-12 | 1991-03-13 | Gore & Ass | Hydrophilic semi-permeable ptfe membranes |
| GB2255931A (en) * | 1991-05-24 | 1992-11-25 | Rogers Corp | Particular filled composite film and method for making same abstract |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9401102D0 (en) | 1994-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |