1results about How to "Stable and mature process" patented technology

This invention belongs to the field of ceramic membranes and electronic chemical recycling, specifically relating to a method for preparing an ultraporous ceramic membrane for NMP purification. The method includes the following steps: (1) pretreatment of the ceramic membrane; (2) modification treatment of the ceramic membrane; and (3) preparation of the ultraporous ceramic membrane for NMP purification. Compared with existing technologies, the advantages of this invention are: 1) This invention can efficiently purify NMP from NMP waste liquid with different impurity contents, has a wide range of applications, and does not generate new pollutants during the entire process. The process is mature and stable and can be applied to the recycling and comprehensive treatment of various NMP-containing waste liquids. 2) This invention uses specific ultraviolet (UV) light irradiation conditions to modify the ceramic membrane surface. The surface grafting polymerization technology mainly focuses on the formation of active centers. Furthermore, the UV grafting modification only occurs on the surface of the ceramic membrane material and does not damage the internal structure of the ceramic membrane material. The ceramic membrane has good stability, high purity of NMP waste liquid recovery, and few impurity ions.