Process for Using a Cross-Flow Filter Membrane to Remove Particles from a Liquid Stream

摘要

A process is provided for separating particles from a liquid stream by a crossflow mechanism. The liquid stream is passed tangentially across a membrane, where the membrane comprises an active layer that has a fibrous structure in the form of a nonwoven, and the nonwoven has i) a mean flow pore size of 0.03 to 1.7 microns, ii) a maximum pore size of 3.1 microns, and an active layer having a mean thickness of less than 300 microns.

主权项

1. A process for separating particles from a liquid stream comprising the steps of:
(a) providing a liquid stream to be filtered comprising particles and a membrane for separating the particles having a first surface, and a second surface that is opposite to the first surface; (b) passing the liquid stream tangentially across the first surface of the membrane; (c) recovering a particle rich fraction of the liquid stream from the first surface of the membrane; and (d) recovering a particle depleted fraction of the liquid stream from the second surface of the membrane;wherein the membrane comprises an active layer that has a fibrous structure in the form of a nonwoven, wherein the nonwoven has i) a mean flow pore size of 0.03 to 1.7 microns, ii) a maximum pore size of 3.1 microns or less, and iii) a mean thickness of the active layer of less than 300 microns.