SEMIPERMEABLE MEMBRANES OF COPOLYAMIDES

Semipermeable membranes of copolyamides The invention relates to semipermeable membranes with a water absorption capacity of from 4.5 to 11. % by weight, preferably from 4.5 to 8 % by weight, as measured on approximately 40 .mu. thick symmetrical films at room temperature and at 65 % relative air hu...

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Bibliographic Details
Main Authors BENTZ, FRANCIS, WOLF, GERHARD D, KUENZEL, HANS E, ELFERT, KLAUS
Format Patent
LanguageEnglish
Published 16.06.1981
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
THEIR PREPARATION OR CHEMICAL WORKING-UP
TRANSPORTING
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Summary:Semipermeable membranes of copolyamides The invention relates to semipermeable membranes with a water absorption capacity of from 4.5 to 11. % by weight, preferably from 4.5 to 8 % by weight, as measured on approximately 40 .mu. thick symmetrical films at room temperature and at 65 % relative air humidity, a throughflow of 130 to 200 l/m2d for a desalination level of 94.6 to 99.5 % and consisting of an aromatic heterocycle-containing copolyamide with a relative viscosity of ?1.4, as measured on a 0.5 % N-methyl pyrrolidone solution at a temperature of 20.degree.C.
Bibliography:Application Number: CA19760267137