High flux semipermeable cellulosic derivative membranes with dry handling capabilities and their method of preparation

Abstract

Abstract THE PRESENT INVENTION IS DIRECTED TO DRY SEMIPERMEABLE MEMBRANES WHICH CAN ADVANTAGEOUSLY BE DRY-STORED AND USED FOR THE SELECTIVE SEPARATION OF VARIOUS COMPONENTS OF A SOLUTION SUCH AS SALT WATER. THE MEMBRANES ARE PREPARED BY CASTING A COLUTION OF A CELLULOSIC DERIAVATIVES HAVING UNITS REPRESENTED BY THE FORMULA (2-(R1-O-CH2-),4-(R2-O-),5-(R3-O-)-3,6- TETRAHYDROPYRANYLENE-O-) WHEREIN R1, R2 AND R3 ARE SELECTED FROM THE GROUP CONSISTING OF R4 AND CR5O, WHEREIN HYDROGEN R4 IS AN ALKYL CONTAINING FROM 1 TO 8 CARBON ATOMS AND R5 IS AN ALKYL CONTAINING FROM 1 TO 7 CARBON ATOMS, AND WHEREIN NO MORE THAN TWO OF R1, R2, AND R3 CAN BE H, TO FORM A MEMBRANE. THE MEMBRANE IS THEN IMMERSED IN AN AQUEOUS MEDIUM FOR A TIME SUFFICIENT FOR THE FORMATION OF A MEMBRANE POSSESSING A TOUGH OUTER SKIN ON THE SIDE EXPOSED TO AIR DURING CASTING. THE MEMBRANE IS THEN DRIED AT ROOM TEMPERATURE. A PREFERABLE CELLULOSIC SOLUTION IS COMPOSED OF CELLULOSE ACETATE DISSOLVED IN ACETONE CONTAINING FORMAMIDE AS AN ADDITIVE.

Inventors

• 👤 Mary Ann Justice
• 👤 Joseph W Mccutchan

Bibliographic Details