Styrene modified membrane efficient recovery dewaxing solvent

June 19 04:00:38, 2018

The grafted styrene modified membrane developed by the Daqing Chemical Research Center of the Petrochemical Research Institute and its preparation method have recently obtained national invention patents. The membrane was used to separate and recover the toluene and butanone solvent in the lube ketone benzene dewaxing filtrate. When the temperature was -15°C, the rejection was as high as 88%, which was of great significance for energy conservation and consumption reduction.
The dewaxing of modern lubricating oil base oils mainly adopts the solvent dewaxing process. After using a large amount of solvents, it is still necessary to effectively recycle the solvent. Previously, solvent recovery had been a three-way evaporation method, and the solvent consumed a lot of energy during the heating-condensation cycle. To this end, Daqing Chemical Research Center has developed a new way to use styrene modified membranes to efficiently recover solvents with low energy consumption.
They used polyacrylonitrile, polysulfone, or polyethersulfone ultrafiltration membranes as the matrix membrane, and grafted the styrene gaseous monomer in contact with the membrane to prepare a nanofiltration membrane. The membrane has strong hydrophobicity, small pore size and uniform distribution, and improves the separation performance of the traditional polymer membrane. The membrane was used for the separation and recovery of toluene and butanone solvent in the lube ketone benzene dewaxed filtrate, and had a high rejection rate for lubricating oil under certain operating conditions.
This patented technology is used to recover the dewaxing solvent. It can directly recover the ketobenzene solvent from the lubricating oil dewaxing filtrate at low temperature, and can save the fuel oil consumption in the evaporation recovery process and reduce the consumption of cooling water in the condensation process. Increases the output of lubricants, while also reducing the organic vapors such as toluene and butanone that are volatilized due to heating, and reduces environmental pollution.