Composite OSN membrane for recycling lubricating oil dewaxing solvent and cleaning method of composite OSN membrane

• Main Authors: SHEN CUIPING, LI HONGPO, XIA QINGHUA, XIN YISHUANG, LU SONG, ZHAO XIAODONG
• Format: Patent
• Language: Chinese; English
• Published: 05.07.2024
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

The invention relates to the technical field of membrane separation, and discloses a composite OSN membrane for recovering a lubricating oil dewaxing solvent and a cleaning method of the composite OSN membrane. The cleaning method comprises the following steps: (1) carrying out low-speed forward flushing on the composite OSN membrane by using water; the composite OSN membrane comprises a composite layer consisting of a supporting layer and a selectively permeable functional layer attached to the supporting layer, and (2) carrying out forward flushing on the composite OSN membrane by adopting a high-temperature solvent so as to remove the iron powder and paraffin microcrystals attached to the surface and/or pore channels of the composite OSN membrane. According to the cleaning method, iron powder and paraffin microcrystals deposited and attached to the surface of the membrane can be effectively removed, the permeation flux of the cleaned membrane is greatly improved, and the method is convenient to operate and