Patent ID: 11958014
Assignee: HARRIS MEMBRANE CLEAN TECHNOLOGY INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B  Y | IPC B

Claim 1:
2. The composite NF membrane with the EDL according to claim 1, wherein a preparation method of the negatively-charged support membrane comprises:
step 1: dissolving 9.2% (mass fraction) of the PVDF and 9.3% (mass fraction) of the sulfonated PVDF in 81.5% (mass fraction) of N-methylpyrrolidone (NMP) at 65° C., and after the compounds are fully dissolved, allowing a resulting solution to stand for 5 h to allow bubble removal; and
step 2: coating the casting solution obtained in step 1 on the non-woven fabric, and forming a film through nonsolvent-induced phase separation (NIPS) in 15° C. water to obtain the negatively-charged support membrane.