Dynamic membrane process on moving porous support

C - Chemistry – Metallurgy – 02 – F

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182/15.6

C02F 1/44 (2006.01)

Patent

CA 1157712

ABSTRACT 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 additio- nal 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.

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