Preparation method and application of polyamide nanofiltration composite membrane

• Main Authors: CAO YIMING, LI YUNHAO, KANG GUODONG
• Format: Patent
• Language: Chinese; English
• Published: 23.04.2024
• Subjects: CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention discloses a preparation method and application of a polyamide nanofiltration composite membrane, and the preparation method comprises the following steps: A) placing a porous support layer in an aqueous solution containing organic amine and a rigid positively charged monomer, and impregnating to obtain an infiltrated porous support layer; and B) placing the infiltrated porous support layer obtained in the step A) in an organic solution containing polyacyl chloride, carrying out polymerization reaction, and drying to obtain the polyamide nanofiltration composite membrane. A rigid positively charged monomer is added into an interfacial polymerization water phase, so that a rigid molecular structure is embedded between formed flexible polyamide chains, and the polyamide membrane with a rigid-flexible blended structure is prepared. The material has higher water permeability and magnesium-lithium selectivity, and can be used in the fields of multivalent/monovalent ion system separation, industrial wa