Roll type ultrafiltration membrane assembly nanofiltration membrane equipment

Nanofiltration membranes (Nanofiltration Membranes) are a new type of separation membrane that came out in the late 1980s. Most of them are organic polymer composite membranes that can retain nano-level (0.001 micron) substances. The operating range of the nanofiltration membrane is between ultrafiltration and reverse osmosis. The molecular weight of the retained organic matter is about 100-1000 Daltons, and the ability to retain dissolved salts is between 20% and 98%; the operation of the nanofiltration membrane The pressure is lower than the reverse osmosis membrane, generally 3.5-40bar; the removal rate of soluble divalent and high-valent ions is much higher than that of monovalent ions; using these characteristics of nanofiltration membranes, nanofiltration membranes can be used for hardness removal, desalination, concentration, etc. 

High-performance nanofiltration membrane is the core material of the nanofiltration system. The requirements for nanofiltration membrane materials are: good film formation, thermal stability, chemical stability, pollution resistance, high mechanical strength, resistance to acid, alkali and microbial corrosion, resistance to chlorine and other oxidizing substances, and high water content Flux and high salt rejection rate; nanofiltration membranes are mostly aromatic and polyacid hydrogen composite nanofiltration membranes. The composite membrane is an asymmetric membrane and consists of two parts: one part is a supporting porous membrane whose mechanism is sieving; the other part is a thinner dense membrane that plays a role of separation. Its separation mechanism can be dissolved and diffused. The theory is explained. For the composite membrane, the material and structure of the skin layer and the support layer can be optimized separately, and a composite membrane with excellent performance can be obtained.

The commonly used nanofiltration membrane module is a spiral wound type. The outer diameter of the nanofiltration membrane element is 2.5 inches, 4 inches, and 8 inches.

Relying on more than 20 years of rich experience in special membrane applications, our company has developed a variety of nanofiltration membrane processes, combined with CRM ceramic membranes and organic membranes, and successfully applied integrated membrane separation processes in the process industries of medicine, food, and chemical industries. Specific applications are as follows:
1.Ceramic membrane clarification of antibiotic fermentation broth + nanofiltration membrane concentration integrated membrane process
2.Amino acid fermentation broth nanofiltration membrane concentration, decolorization and desalination process
3. Nanofiltration membrane concentration and desalination process of vitamin fermentation broth
4. Functional sugar nanofiltration membrane concentration process
5. Nanofiltration desalination and concentration process of dye solution
6. Nanofiltration membrane concentration process for plant extracts
7. Nanofiltration membrane concentration process for fruit and vegetable juice
8. Nanofiltration membrane desalination and concentration process of protein peptide enzymatic hydrolysate
9. Nanofiltration and concentration process of corn/rice deep processing wastewater
10. Chlor-alkali chemical nanofiltration denitrification process

 For industrial fluids of different properties, before designing nanofiltration membranes, it is necessary to understand the physical and chemical performance indicators of the feed liquid, which are mainly as follows:
Concentration and molecular weight distribution of target components
Total organic matter and total solid matter

 Suspended matter
PH value
Temperature

Conductivity
Protein content

Our company can provide a variety of multi-functional nanofiltration experimental equipment, which can be equipped with various roll-type ultrafiltration nanofiltration membrane elements, conduct small-scale experiments of materials and liquids, and perform membrane process simulation and verification, so as to be a large-scale ultrafiltration nanofiltration system Provide technical and economic feasibility analysis, and provide a full range of ultrafiltration and nanofiltration membrane elements according to the specific material separation requirements of the full range of users, as follows:
1. Membrane size: 1812, 2540, 4040, 4038, 8040, 8038
2. Feeding grid: 28mil, 30mil, 35mil, 40mil, 60mil, 80mil
3. Membrane molecular weight cut-off: 100D, 150D, 200D, 300D, 500D, 800D, 1KD, 3KD, 5KD, 10KD, etc.
4. Membrane material: aromatic polyamide, polysulfone PS, polyethersulfone PES, polyvinylidene fluoride PVDF, polyimide PI, etc.
5. Operating pressure: 3.5bar ~ 45bar
6. Special film: high temperature resistant type >70℃, strong acid resistant type, strong alkali resistant type

After collecting the experimental data, in order to more accurately evaluate and quote the project, we also need to understand the upstream and downstream processes, processing capacity, processing requirements, material requirements, etc. of the process.