• 专利标题:   Preparing composite nanofiltration membrane assembled layer-by-layer useful in seawater desalting field, comprises e.g. performing interfacial polymerization reaction on oil-aqueous phase interface region, placing composite nano-filtration membrane on container and assembling polyamide film.
  • 专利号:   CN115920660-A
  • 发明人:   LIU J, SU Y
  • 专利权人:   SHANDONG JINYU MEMBRANE TECHNOLOGY DEV
  • 国际专利分类:   B01D061/00, B01D067/00, B01D069/12, B01D071/56, C02F001/44
  • 专利详细信息:   CN115920660-A 07 Apr 2023 B01D-069/12 202340 Chinese
  • 申请详细信息:   CN115920660-A CN11605403 14 Dec 2022
  • 优先权号:   CN11605403

▎ 摘  要

NOVELTY - Preparing composite nanofiltration membrane assembled layer-by-layer comprises (i) taking 0.01-5 wt.% piperazine as aqueous phase monomer, .01-5 wt.% graphene quantum dot as aqueous phase additive and 0.01-1 wt.% trimesoyl chloride as oil phase monomer, and normal hexane, normal heptane or isoparaffin as organic solution; (ii) fixing porous supporting body on stainless steel wire net, adding aqueous phase in container, spreading oil phase on aqueous phase, performing interfacial polymerization reaction on oil-water two-phase interface region, generating polyamide film; (iii) lifting porous supporting body pre-placed at bottom of container, transferring polyamide film to porous supporting body, performing heat treatment in oven, preparing composite nano-filtration membrane; and (iv) sequentially placing prepared composite nano-filtration membrane on bottom of container, aqueous phase and oil phase in container, lifting supporting body, assembling polyamide film layer-by-layer. USE - The composite nanofiltration membrane assembled layer-by-layer is useful for waste water zero discharge, printing and dyeing waste water treatment, biological medicine and sea water desalting field. ADVANTAGE - The method: has simple process, stable structure of composite nano-filtration membrane, high desalting and separating performance, high water permeation flux, high sodium sulfate interception rate, high separation performance and high separation factor of chloride ion sulfate ion.