High-flux and inorganic-scaling-resistant medium-desalination nanofiltration membrane and preparation method thereof

Abstract

The invention belongs to the technical field of preparation of nanofiltration membrane materials, and particularly relates to a high-flux and inorganic-scaling-resistant medium-desalination nanofiltration membrane and a preparation method thereof. An amine water-phase solution, an oil-phase solution and a dimethylformamide solution are adopted to treat a polymer-based membrane, and through the special component proportion in the amine water-phase solution and the oil-phase solution, compared with a traditional nanofiltration membrane and a reverse osmosis membrane, the prepared high-flux and inorganic-scaling-resistant medium-desalination nanofiltration membrane has higher water yield under the same operation pressure, can moderately desalt, and has improved inorganic scaling resistance.

Description

technical field

[0001] The invention belongs to the technical field of preparation of nanofiltration membrane materials, and in particular relates to a high-throughput inorganic fouling-resistant medium desalination nanofiltration membrane and a preparation method thereof. Background technique

[0002] Membrane separation technology refers to the technology that achieves selective separation of a mixture of molecules with different particle sizes at the molecular level when passing through a semi-permeable membrane. The membrane wall is covered with small holes, which can be divided into microfiltration membrane (MF), Ultrafiltration membrane (UF), nanofiltration membrane (NF), reverse osmosis membrane (RO), etc.

[0003] Nanofiltration membranes were first used in the drinking water treatment industry, mainly for water softening. The rejection rate of NF membrane to divalent and multivalent ions can reach more than 90%, and the rejection rate to monovalent salt is 10%-90%....

Images