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Article | REF: F3250 V1

Membrane separations in the food industry

Authors: Pierre AIMAR, Georges DAUFIN

Publication date: December 10, 2004

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2. Basic concepts and mechanisms

In this section, we recall a few definitions and laws of behavior concerning membranes. For a more in-depth theoretical review, consult the general literature in .

2.1 Definitions

Permeate: fluid flowing downstream of the membrane.

Retentate: fluid retained by the membrane.

Asymmetrical membranes: membranes composed of a thin layer (skin) for selectivity and a thicker support for mechanical strength (composite membranes, heterogeneous membranes). Symmetrical membranes do not have this characteristic.

Composite membrane: membrane composed of several layers of different materials.

Dense membrane: non-porous membrane (reverse osmosis, electrodialysis,...

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