Process for manufacturing cellulose acetate membranes

Details Process for manufacturing cellulose acetate membranes Process for manufacturing cellulose acetate membranes

1994-10-19

1996-04-09

Fortuna, Ana M.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264178R, 264186, 264187, 264191, 264195, 264200, 21050023, 21050029, 2105003, B29C 4700, B01D 3900

Patent

active

055058906

ABSTRACT:
A dialysis membrane in the form of a hollow fiber with a continuous internal cavity is made of cellulose acetate or a cellulose acetate derivative. The membrane has a maximum screen coefficient of 0.04 for albumin with a molecular weight of 68,000. A dialysis membrane in the form of a hollow fiber with a continuous internal cavity may be made in a process using a spinning solution containing an organic carboxylic acid and a cavity-forming liquid. Modification agents and/or water are optionally added and the solution is extruded through a spinneret suitable for the manufacture of hollow fibers. The precipitation of the resultant dialysis membrane and the usual further aftertreatment take place in a precipitation bath. The organic carboxylic acid preferably is acetic acid and the precipitation bath preferably is a dilute acetic acid.

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