Ceramic Nanofiltration Membrane Technology Introduction
Membrane separation technology is widely used in various separation, purification and concentration processes in water treatment, dyes, food, medicine and chemical industry due to its advantages such as simple process, no chemical change and phase change, and environmental friendliness. Membrane materials can be divided into microfiltration membrane (MF), ultrafiltration membrane (UF), nanofiltration membrane (NF) and reverse osmosis membrane (RO) according to the pore size.
Nanofiltration is a pressure-driven membrane separation process between ultrafiltration and reverse osmosis. Its core element, the nanofiltration membrane material, has nanometer-sized micropores (pore diameter: 1 ~ 2 nm) and the surface is charged, so that the nanofiltration membrane can not only retain small organic molecules with molecular weights of 200 ~ 1000 Da, but also has a strong effect on ions. Certain retention effects.
Nanofiltration membranes are mainly divided into organic nanofiltration membranes and inorganic nanofiltration membranes according to materials. Due to the limitation of the material itself, the organic nanofiltration membrane has a narrow pH range, poor solvent resistance, high temperature resistance and oxidizing environment, so it is suitable for the separation process of mild systems. Compared with organic nanofiltration membranes, ceramic nanofiltration membranes have excellent thermal stability, chemical stability, solvent resistance and oxidation resistance. In the process industry, especially the separation, purification and concentration of nanoscale substances in extremely harsh environments China has broad application prospects. However, due to the complex and difficult preparation process of ceramic nanofiltration membranes, and because of the technical confidentiality involved, currently only a few companies in the world can provide commercial products.
After nearly 20 years of accumulation in the field of ceramic membranes and nearly 10 years of research, Jiuwu Hi-Tech has taken the lead in independently developing ceramic nanofiltration with completely independent intellectual property rights in China with the support of the "863" major research plan of the Ministry of Science and Technology. Membrane series products, and the first domestic ceramic nanofiltration membrane industrialized production line, with an annual production capacity of 50,000.
The ceramic nanofiltration membrane developed by Jiuwu Hi-Tech has a narrow pore size distribution, low cost, and is not easy to pollute during operation (organic membranes need to be cleaned frequently). It is separated in harsh systems such as high temperature, strong acids and alkalis, organic solvents, especially strong oxidizing environments. Stable performance, highly affirmed by application manufacturers, and better performance than similar international ceramic nanofiltration membrane products. In addition, the company can also carry out quantitative adjustment and batch preparation of ceramic membrane pore size (from 3 mm-1 nm) according to the needs of the enterprise. In terms of equipment manufacturing, Jiuwu successfully solved the problems of sealing the nanofiltration membrane module under high pressure (up to 3.5 MPa) and the manufacture of high pressure separation device, so that the ceramic nanofiltration membrane device can be continuously operated under high pressure (> 2 MPa). , Stable, long-term operation.
等过程中得到成功应用。 At present, Jiuwu High-tech ceramic nanofiltration membrane products have been successfully used in the chemical fiber industry alkali reuse, sucrose refining, plant extraction, amino acid decolorization, antibiotic purification and separation of traditional Chinese medicine extracts . With the increasing demand for the separation of different valence ions and the separation of substances with a relative molecular weight in the range of 200 ~ 10000 Da in the field of liquid separation, especially the country's increasing emphasis on energy conservation and emission reduction in the process industry, ceramic nanofiltration membranes are used in medicine, biology The fields of chemical industry, petrochemical industry and water treatment will have broad application prospects.