Patent ID: 11905180
Assignee: TORAY INDUSTRIES, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  H  Y | IPC B  C

Claim 17:
18. The method for recovering a rare metal salt according to claim 1, wherein
the nanofiltration membrane comprises a base material, a porous support layer on the base material, and a separation function layer on the porous support layer, and
the separation functional layer comprises a crosslinked polyamide having a structure derived from a polyfunctional aliphatic amine represented by the following general formula (1),, provided that R1 and R2 each independently means an alkyl group having 1 to 6 carbon atoms, a phenyl group, a benzyl group, COOR5, CONHR5, CON(R5)2, or OR5, and R5 means a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a phenyl group, or a benzyl group; and R3 and R4 each independently means hydrogen, an alkyl group having 1 to 6 carbon atoms, a phenyl group, a benzyl group, COOR6, CONHR6, CON(R6)2 or OR6, and R6 means a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, a phenyl group or a benzyl group.