Dialyzing membrane with adsorbent layer

Details Dialyzing membrane with adsorbent layer Dialyzing membrane with adsorbent layer

1979-04-16

1981-05-12

Hart, Charles N.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

210492, 210502, 2105002, B01D 3918

Patent

active

042670470

ABSTRACT:
A dialyzing membrane, especially for hemodialysis, formed as a hollow fiber, tubular foil or flat sheet by regeneration of cellulose from a cuprammonium solution, the membrane comprising at least two firmly adhered cellulosic layers including at least one dialyzing layer consisting essentially of a semipermeable regenerated cellulose and at least one adsorbent layer consisting of said regenerated cellulose containing embedded therein fine particles of an adsorbent material in an amount of up to 95% by weight with reference to the dry weight of the adsorbent layer, preferably 1 to 90% and especially 20 to 70% by weight, when the adsorbent layer is part of a hollow fiber structure. The dialyzing membrane of the invention is produced by a method requiring at least two cuprammonium cellulose solutions, one of which is free of adsorbent particles and another of which contains a suspension of adsorbent particles, the different solutions being spun from adjacent spinning slots for immediate layer to layer contact and then introduced over a short air gap into a coagulating or precipitating bath to entrap the adsorbent particles in the spun layer in which the particles were originally suspended. Isopropyl myristate is particularly advantageous as a liquid filler for the axial duct or canal of a hollow membrane.

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The Condensed Chemical Dictionary, 9th Edition, G. Hawley, copyright 1950, Van Nostrand-Reinhold Co., N.Y., pp. 920, 242, 485.
Cuprophan Technical Information Bulletin, No. 12, 9/1976, Enka Glianzstoffas, W. Germany.

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