DYNAMIC MEMBRANE PROCESS ON MOVING POROUS SUPPORT

摘要

It is known the dynamic membrane process in which dynamic membrane formation and further rejection of the dissolved substances and/or fine particle separation from a solution are made on a motionless porous support at the transmembrane pressure in the range of 400-I000 psig.Frequently,in addition to this high transmembrane pressure, a high velocity circulating cross-flow feed stream is used in order to achieve high permeate flux.To carry out this feed circulation an additional energy consumption is required. In this invention the dynamic membrane formation and further rejection and/or particle separation by previously formed dynamic membrane are carried out on a rotating porous support that allows to achieve both dynamic membrane formation and further rejection of dissolved substances and/or fine particle separation from solution by previously formed membrane at forty- to hundredfold lower transmembrane pressure(7-20psig. and without or under very low cross-flow stream of the feed solution. By this,the permeate flux,i.e. specific productivity of the dynamic membrane,is in the same range as for high transmembrane pressure and high velocity cross-flow feed stream dynamic membrane process carried out on a motionless porous support.