Method for increasing performance of reverse osmosis membrane

Abstract

The invention relates to the technical field of reverse osmosis membrane performance improving, in particular to a method for increasing the performance of a reverse osmosis membrane. The method includes: using a pickling agent to perform acid pickling on the reverse osmosis membrane after interface polymerization is completed, then using a chemical surface treating agent to perform chemical surface treatment, and using a humectant to perform moisturizing treatment on the reverse osmosis membrane. The method has the advantages that the charge density and chemical components of the polyamide desalting layer of the reverse osmosis membrane can be precisely regulated, the desalting rate and water flux of the reverse osmosis membrane are improved at the same time, the hydrophilicity of the reverse osmosis membrane is increased, pollution occurrence frequency is lowered, the cleaning recovery ability of the reverse osmosis membrane during the actual operation of the reverse osmosis membrane is increased, the defect of an imperfect desalting layer network structure caused by the interface polymerization is overcome, the content of residual monomer is reduced, the desalting rate is increased by 0.5%, and the flux is increased by 20-60%.

Description

Technical field [0001] The invention relates to the technical field of improving the performance of reverse osmosis membranes, in particular to a method for improving the performance of reverse osmosis membranes. Background technique [0002] Reverse osmosis, also known as reverse osmosis, is a separation technology that uses pressure difference as the driving force to separate solvent from solution. Reverse osmosis membrane is a membrane device used in the field of reverse osmosis separation technology, which can intercept various inorganic ions, alternating substances and macromolecular solutes. The development of reverse osmosis membrane technology is relatively rapid, and it has been applied in many fields such as food, medicine, and chemical industry. It is made of polymer materials, such as polyurethane, cellulose acetate, aromatic polyhydrazide, etc. The performance of the reverse osmosis membrane is also closely related to the material selected, which leads to uncertain ...

AI Technical Summary

Problems solved by technology

[0004] However, for the reverse osmosis membrane prepared by the interfacial polymerization method, diamine and other substances are used as the aqueous phase monomer, and acid chloride and the like are used as the organic phase monomer, so that a large amount of functional monomers remain on the surface of the prepared reverse osmosis membrane. As a result, the ability of the reverse osmosis membrane to resist dissolved oxygen and residual chlorine is poor, which shortens the service life of the reverse osmosis membrane, and easily causes pollution, which increases the operating cost of the reverse osmosis membrane and reduces the flux of the reverse osmosis membrane. However, the surface modification treatment method of reverse osmosis membrane in the prior art cannot fully solve this technical problem, and the treatment process is more complicated and the cost is higher