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For a long time, the solvent dewaxing method has always played an important role in the production of lubricant base oils. The dewaxed solvent is separated from the mixture of lubricating oil and solvent mainly through a distillation process and recycled. However, due to the frequent circulation of the solvent, a large amount of energy is consumed, which becomes a bottleneck for the expansion of lubricating oil and paraffin production. For this reason, researchers at the Daqing Chemical Research Center have opened up a new path for high efficiency and low energy consumption through membrane separation methods.
They first prepared a soluble polyimide, made it into a casting solution, formed a film by phase inversion method, and then obtained the desired nanofiltration membrane after solvent exchange and heat treatment. The thus formed polyimide nanofiltration membrane has a high rejection rate for the lubricating oil under a certain operating condition and a high permeation flux for the solvent. The results showed that the rejection rate of polyimide nanofiltration membranes was greater than 90% at -18°C to room temperature and 3MPa operating pressure, and the flux of ketobenzene-based mixed solvents was greater than 12L/m 2 ·h to meet the industrial requirements. Application requirements.
Polyimide nanofiltration membrane preparation method patented
A preparation method of polyimide nanofiltration membrane developed by Daqing Chemical Research Center has recently obtained the national invention patent. Polyimide nanofiltration membranes prepared by this technology can be used for the recovery of lube ketone benzene dewaxing solvents.