The
development of inorganic membranes started with vycor type glass membranes
initially studied around the 1940’s. The first period that proceeded the
current generation of inorganic membranes was related to the separation of
uranium isotopes by gaseous diffusion processes. The challenge was to employmembrane materials who can sustain aggressive environment and offer reliable
performances. Following such developmental work, two companies in the 1973, Ceraver
and Euroceral, started to produce ceramic oxide based supports used to supply
the Nuclear Fission Industry of suitable propeller. The nature of the membranes
still operating in Eurodif plant (France) remains classified.
The second
period consists on the development of microfiltration (MF) and ultrafiltration
(UF) inorganic membranes as a consequence of the knowledge accumulated by the
companies producing gaseous diffusion plants. In the 1960’s, Carre (a
subsidiary of DuPont) developed the concept of liquid filtration on dynamic
zirconium hydroxide supported on stainless steel. In the 1970’s, Union Carbidedeveloped ceramic oxide layers coated on carbon supports. The first commercial
cross-flow filtration system equipment with inorganic membrane was manufactured
by SFEC in the 1978. The concept of multichannel support was introduced in the
1980’s from Ceraver and could be considered the starting point on the
development of the new generation of ceramic membranes (CM) which began to
operate at lower porosity scales: UF first and nanofiltration (NF) more
recently.