Solute-separating membrane
AssigneeFurukawa Electric Co., Ltd.
InventorsHideo Sekiguchi, Fumishi Sato, Kazuo Sadamitsu, Kazuaki Yoshida
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Abstract
A solute-separating membrane consisting of a polyoxadiazole series resin containing at least one of the structural units of formulae: ##STR1## wherein Ar and Ar' are same or different multivalent aromatic residues, and R is an alkyl, cycloalkyl or aralkyl group having from 1 to 7 carbon atoms, and swollen to a swelling degree of 1.7-15 with a swelling agent of water, a solvent miscible with water, or a mixture of water and the solvent has a high separating ability and further has high mechanical strength and chemical and thermal stabilities.
Claims15
In the process of separating a solute from an aqueous or non-aqueous solution containing the solute using a separation membrane, the improvement comprising using as the separation membrane a solute-separating membrane consisting of at least one polyoxadiazole series resin selected from the group consisting of
- A. polyoxadiazole resin having a repeating structural unit of the general formula:
- ##STR15## wherein Ar and Ar' are the same or different multivalent aromatic residues, and
- B. oxadiazole-N-substituted hydrazide copolymeric resin insoluble in organic solvent having separating structural units of general formulae:
- ##STR16## wherein Ar is a multivalent aromatic residue and R is an alkyl, cycloalkyl or aralkyl group having from 1 to 7 carbon atoms, and swollen to a swelling degree of 1.7-15 with a swelling agent selected from the group consisting of water, a solvent miscible with water, and a mixture of water and said solvent.
Dependencies are inferred from the claim text.