A novel preparation method for polyimide nanofiltration membranes, developed by the Daqing Chemical Research Center, has recently been granted a national invention patent. This innovative technology enables the production of polyimide nanofiltration membranes that are particularly effective in recovering lube ketone benzene dewaxing solvents, offering a promising solution to an industry challenge.
For many years, solvent dewaxing has remained a critical process in the production of lubricant base oils. Traditionally, the dewaxed solvent is separated from the oil-solvent mixture via distillation and then recycled. However, this repeated circulation leads to significant energy consumption, which has become a major obstacle in expanding the production of lubricants and paraffin. To address this issue, researchers at the Daqing Chemical Research Center have pioneered a more efficient and energy-saving approach using membrane separation technology.
The process involves first synthesizing a soluble polyimide, preparing it into a casting solution, and then forming a film through a phase inversion method. Following this, the membrane undergoes solvent exchange and heat treatment to achieve the desired structure and performance. The resulting polyimide nanofiltration membrane exhibits excellent rejection capabilities for lubricating oil under specific operating conditions, while maintaining a high permeation flux for the solvent.
Experimental results demonstrated that the membrane achieved a rejection rate exceeding 90% at temperatures ranging from -18°C to room temperature, under an operating pressure of 3 MPa. Additionally, the flux of ketobenzene-based mixed solvents exceeded 12 L/m²·h, meeting all necessary industrial requirements. This breakthrough not only improves the efficiency of solvent recovery but also significantly reduces energy consumption, marking a major step forward in sustainable lubricant production.
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