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Preparation of asymmetric PTFE membranes and their application in water purification by hyperfiltration
Author(s) -
Vigo Fernando,
Bottino Aldo,
Munari Stelio,
Capannelli Gustavo
Publication year - 1977
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1977.070211208
Subject(s) - membrane , reverse osmosis , materials science , chemical engineering , porosity , permeability (electromagnetism) , chromium , sintering , chromatography , composite material , chemistry , metallurgy , biochemistry , engineering
Asymmetric PTFE membranes suitable for purifying and separation by reverse osmosis also in aggressive conditions of the feed were prepared. A technique has been set up in order to obtain the necessary porous supports, using sintering of PTFE emulsions in the presence of salts. The pore distribution, hydraulic permeability, and shape by microscopic observation were investigated. Asymmetric membranes were then prepared by deposition of these porous supports onto dense thin PTFE films. Their properties were checked in a reverse osmosis plant with NaCl, saccharose, chromium, nickel, copper, detergents, and oil emulsions.