Title:
POROUS FLUOROCARBON MEMBRANE, METHOD OF PRODUCING IT AND A CARTRIDGE FILTER BASED ON IT
Document Type and Number:
WIPO Patent Application WO/1997/015381
Kind Code:
A1
Abstract:
The proposed porous fluorocarbon membrane comprises a porous substrate with an average pore size of 5.0 to 500.0 microns and a difference in specific weight in one sample of not greater than 7.0 %. The porous substrate is completely impregnated with a copolymer consisting of 23-25 wt.% tetrafluoroethylene and 73-75 wt.% vinylidene fluoride, the relative viscosity of a solution of the copolymer in acetone to that of acetone being 2.0 to 4.0. The method of producing a porous fluorocarbon membrane with a porous substrate and the above-mentioned properties involves the following: the tetrafluoroethylene copolymer is dissolved together with vinylidene fluoride in a low-boiling point solvent; the solution is mixed with a precipitant mixture of alcohol and water to produce a working solution; the above-mentioned porous substrate is impregnated with the heated working solution and allowed to stand for a short time so that part of the solvent can evaporate and the working solution can partially solidify; the membrane thus formed then undergoes drying in at least three zones under conditions of raised temperature and passing from one zone to another. The cartridge filter comprises: cylindrical perforated hollow protective and support units; and a corrugated porous fluorocarbon membrane of the above design with a pre-filter and drain situated between the protective and support units and hermetically connected to the end cover elements. The cartridge filter has two of these membranes one laid on the other; the pores in the membrane closer to the pre-filter are between 0.25 and 0.65 microns in size and in the second membrane between 0.15 and 0.45 microns.
Inventors:
KARACHEVTSEV VYACHESLAV GRIGOR (RU)
DUBYAGA VLADIMIR PAVLOVICH (RU)
AMELINA NATALYA VLADIMIROVNA (RU)
TARASOV ALEXANDR VALENTINOVICH (RU)
DUBYAGA VLADIMIR PAVLOVICH (RU)
AMELINA NATALYA VLADIMIROVNA (RU)
TARASOV ALEXANDR VALENTINOVICH (RU)
Application Number:
PCT/RU1996/000138
Publication Date:
May 01, 1997
Filing Date:
May 29, 1996
Export Citation:
Assignee:
POLIMERSINTEZ AO (RU)
KARACHEVTSEV VYACHESLAV G (RU)
DUBYAGA VLADIMIR P (RU)
AMELINA NATALYA V (RU)
TARASOV ALEXANDR V (RU)
KARACHEVTSEV VYACHESLAV G (RU)
DUBYAGA VLADIMIR P (RU)
AMELINA NATALYA V (RU)
TARASOV ALEXANDR V (RU)
International Classes:
B01D27/06; B01D39/16; B01D63/14; B01D63/06; B01D69/12; B01D71/32; B01D71/34; B01D71/36; B32B27/30; C08J9/14; (IPC1-7): B01D71/32; B01D27/06
Foreign References:
EP0340732A2 | 1989-11-08 | |||
EP0341151A2 | 1989-11-08 | |||
EP0175432A2 | 1986-03-26 | |||
EP0217482A1 | 1987-04-08 | |||
EP0139822A2 | 1985-05-08 | |||
US4906371A | 1990-03-06 |
Other References:
See also references of EP 0804961A4
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