GB2285951A - Semi-permeable membrane - Google Patents

Semi-permeable membrane Download PDF

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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Withdrawn
Application number
GB9401102A
Other versions
GB9401102D0 (en
Inventor
Robert Gittins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ELE International Ltd
Original Assignee
ELE International Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ELE International Ltd filed Critical ELE International Ltd
Priority to GB9401102A priority Critical patent/GB2285951A/en
Publication of GB9401102D0 publication Critical patent/GB9401102D0/en
Publication of GB2285951A publication Critical patent/GB2285951A/en
Withdrawn legal-status Critical Current

Links

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
    • B01D69/10—Supported membranes; Membrane supports
    • 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
    • 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)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (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.
GB9401102A 1994-01-21 1994-01-21 Semi-permeable membrane Withdrawn GB2285951A (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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)