The function of organic solvent resistant nanofiltration (OSRN) membranes are different from those of conventional polyamide NF and RO membranes, but similar to those of pervaporation (PV) membranes, which are applied to separations of organic solutions. The OSRN could be employed in the following processes.
Recycling dewaxing solvent from lubricant oil
Recovering organic solvent in the acid removing process for diesel
Treatment of wastewaters from fine chemical industry
Fuel desulfurization with membrane separation
Recycling catalysts in petrochemical industry
As for all OSRN applications mentioned above, Jinzheng could provide the complete set of solutions to the process technologies and the equipment.
Wastewaters from fine chemical industry
Recycling dewaxing solvent from lubricant oil had been widely applied to refineries.
Ethyl methyl ketone and toluene are separated from dewaxing filtrate using OSRN, which increases the production capacity of base oil by 25%, the recovery rate of dewaxing oil by 3%, and reduces the unit energy consumption by 20%. The investment of membrane modules could be recovered in 1 year.
Wastewaters from fine chemical industry are refractory, and have the following characteristics: complex composition, high COD, high salt concentration, and containing organic solvent.
Conventional separation and recycling methods such as distillation, adsorption and extraction, etc., are of energy consumption, and cause the second pollution easily.
Wastewater from fine chemical industry being treated with OSRN, the permeate could meet the production requirements, and the pollutants are concentrated, and then sent to incineration.
In petrochemical production, there are many catalyst-involved reaction processes.
A decent amount of catalyst is not consumed after reaction. Such catalysts are generally quite expensive, and their molecular weights are in the range of a few hundred Daltons. They could be separated from organic solvents using OSRN, so as to recycle catalysts and reduce production costs.