Making porous membranes and the membrane products

Details Making porous membranes and the membrane products Making porous membranes and the membrane products

1977-05-25

1980-05-20

Anderson, Philip

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

210500M, 264 38, 264 41, 264216, B29D 2704

Patent

active

042038472

ABSTRACT:
Covers a continuous process for making a polymeric membrane having at least 60% or more of its volume taken up by intercommunicating pores of substantially uniform size below about 25 micrometers. Consists of applying a layer of a polymer solution on a rigidly supported backing belt, then passing the belt through a formation bath that includes solvent plus a non-solvent for the polymer that is miscible with its solvent. The bath is recirculated at a substantially constant, preselected composition. The porous structure of the membrane is substantially completely formed in the formation bath. Includes extracting any residual solvent from the porous membrane, then drying the membrane. To produce membrane material of consistent, uniform characteristics and quality, the formation bath is maintained at the preselected composition. Either skinned molecular filtration membranes or microporous membranes may be produced by adjusting process parameters, such as the composition of the formation bath.

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