T/CIPR 069-2022 Active Group standards

T/CIPR 069-2022 High-flux enhanced hollow fiber membrane

Publish Date: 2022-06-10 Implement Date: 2022-07-10 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

Price: $ 20.00

Out of stock

Basic Information

Standard Code: T/CIPR 069-2022

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Films and sheets

Publish Date: 2022-06-10

Implement Date: 2022-07-10

Scope

Main technical content: This technology uses hydrophilic agents, additives, and polyvinylidene fluoride to blend and modify under polar solvents, reducing the surface tension of the membrane surface and the inner wall of the membrane pores, improving the hydrophilicity of polyvinylidene fluoride. At the same time, the hydrophilic agent includes triethanolamine. Triethanolamine not only contains a large number of hydrophilic hydroxyl groups, but also has a very strong electronegativity of nitrogen atoms, with a strong lone pair of electrons. It can form hydrogen bonds with the polar bonds in the additives and attract each other, thus overcoming the problem of decreased hydrophilicity of the hydrophilic additives in hollow fiber membranes after use, enabling long-term maintenance of hydrophilicity, improving the anti-pollution of hollow fiber membranes, and maintaining a high operating flux for a long time. At a pressure of 0.1 MPa and a temperature of 25°C, the pure water flux is 600-800 L/m2·h, the tensile strength of the membrane filament is greater than 260 N, the filtration accuracy reaches 0.15 μm, and a hydrogel layer forms on the membrane surface during operation. Most pollutants (especially the extracellular polymer, which contributes the most to membrane pollution) are not easily attached to the hydrogel layer. Even if a sludge cake forms, it is loose and easy to be shaken off or flushed off. At the same time, the excess triethanolamine in the casting solution can also adsorb to the surface of the hollow fiber material through hydrogen bonding after mixing with the hollow fiber, thereby enhancing the adhesion strength between the separation membrane layer and the hollow fiber. Increasing the hollow fiber as a support can prevent the membrane material from breaking. Moreover, triethanolamine can coordinate with calcium, magnesium, iron, and other ions, and has a good removal effect on metal ions in wastewater. In addition, the small-molecule pore-forming agen