1results about How to "Increase mass concentration" patented technology

The present application relates to the preparation of composite membranes and the separation of methanol dehydration technology, aiming at providing a preparation method of zinc ion hydrophilic metal organic framework mixed polyvinyl alcohol composite membrane. Including: Zn(NO3)2.6H2O, PVP and 2-cyano imidazole are reacted, and the reaction product is sequentially subjected to amidation modification and hydroxyl modification reaction to obtain a zinc ion hydrophilic metal organic framework, which has a microstructure of being externally modified by hydroxyl and amide groups and internally hollow; polyether sulfone ultrafiltration membrane is used as a support membrane, polyvinyl alcohol solution containing the organic framework is dried on the upper part of the support membrane to form a polyvinyl alcohol mixed matrix membrane, and the composite membrane is formed by cross-linking at the contact interface. The present application can preferentially adsorb water molecules and improve the solubility of water in the membrane; water molecules can be selectively passed through, effectively improving the permeability and selectivity of the polyvinyl alcohol membrane to water, and high-purity methanol products can be obtained after cyclic dehydration; by adding MOF fillers and interfacial cross-linking, the present application can maintain good mechanical, chemical and thermal stability.