METHOD FOR THE PREPARATION OF ASYMMETRICAL MEMBRANES

The method relates to the field of membrane technologies. The membranes are used for ultrafiltrations and reverse osmosis and are designed for the desalination of sea water and for the treatment and concentration of different solutions. By the method, membranes are made of polysulphon or cellulose d...

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Bibliographische Detailangaben
Hauptverfasser:	KHRISTOVA, MARIANA, ROGANSKA, STOJANKA S, RAJCHEV, DIMITAR K, PETROVA, TATJANA D, DONCHEVA, MARIJA T, RIBAROVA, PAVLINA G, PANEV, PLAMEN R, MIRCHEVA, PENKA N, POPOV, KOTO I
Format:	Patent
Sprache:	eng
Schlagworte:	PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION TRANSPORTING
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Beschreibung
Zusammenfassung:	The method relates to the field of membrane technologies. The membranes are used for ultrafiltrations and reverse osmosis and are designed for the desalination of sea water and for the treatment and concentration of different solutions. By the method, membranes are made of polysulphon or cellulose di- or triacetate of improved selectivity, throughput, mechanical strength and improved chemical and heat resistance. The method consists in the dissolution of the polymer in organic solvents in the presence of aliphatic alcohols or amines, preferably polyethyleneglycol having molecular mass from 600 to 3000 in concentration 10-60%, preferably 20%, as a regulator of the specific porous surface, deaeration and moulding over unwoven (tufted) textile in a coagulation bath.