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

Claim 18:
19. 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 function layer comprises a crosslinked aromatic polyamide, and the crosslinked aromatic polyamide has a structure represented by the following general formula (2),, provided that R1 to R4 have the same meanings as R1 to R4 in the general formula (1), and R7 is an aliphatic chain or an aliphatic ring comprising only a carbon atom and a hydrogen atom as a constituent element, and Ar8 is an aromatic ring having 6 to 14 carbon atoms which may have a substituent.