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Home Semiconductor manufacture Apparatus-and-process-for-membrane-filtration

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Details
Inventors: Saupe, Wolfram;
Assignee: Hoechst Aktiengesellschaft (Frankfurt am Main, DT)
Primary Examiner: Bascomb, Jr.; Wilbur L.
Assistant Examiner: Spitzer; Robert H.
Attorney, Agent or Firm: Schwaab; Richard L.

A method of membrane filtration of a liquid and an apparatus for carrying out such a method, the apparatus comprising at least two support members including a first and a last support member of porous material arranged in series each support member including a plurality of liquid flow passageways therethrough, whereby liquid flow from the inlet means to the outlet means is possible; inlet means for admitting a liquid to be filtered to the first support member; outlet means for withdrawing a concentrate from the last support member; a semipermeable membrane covering all surfaces of the support members in contact with the liquid; means for providing that flow of liquid from one support means to the next is only via the passageways; and means associated with each support member for withdrawing permeate from therewithin.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide an improved apparatus for the membrane filtration of a liquid.
It is also an object of the present invention to provide such an improved apparatus having a high packing density.
A further object of the invention is the provision of an improved membrane filtration apparatus which is easy to assemble.
Another object of the invention resides in the provision of an improved membrane filtration apparatus wherein the membranes and the members which suppport them are easy to change and replace.
Yet another object of the invention is to provide an improved filtration apparatus which operates with the lowest possible local excess concentration and deposition of solids, in order that the flux remains approximately constant.
In accomplishing these and other objects, there has been provided in accordance with the present invention an apparatus for carrying out membrane filtration of a liquid, which comprises at least two support members of porous material arranged in series, an inlet for admission of liquid to be filtered to the first support member and an outlet for egress of concentration from the last support member, each support member being provided with a plurality of passageways to allow flow of liquid through the assembly of support members in sequence from the said inlet to the said outlet, access of liquid to the porous material of each support member being only through a semipermeable membrane, and the support members being so arranged that flow of liquid from one support means to the next is only via the passageways, and each support member being provided with an outlet for permeate from within its porous material.
When the support members are made entirely of porous material, all parts of their surface to which liquid has access, both the outer walls of the members themselves and the internal walls of the passages, are covered with semipermeable membrane in order to ensure that only liquid which has passed through the semipermeable membrane (i


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