The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 2026
Filed:
Feb. 05, 2024
Tongji University, Shanghai, CN;
Qiaoying Wang, Shanghai, CN;
Tong Zhang, Shanghai, CN;
Zhiwei Wang, Shanghai, CN;
Hao Zhang, Shanghai, CN;
Rong Huang, Shanghai, CN;
Xianfeng Li, Shanghai, CN;
TONGJI UNIVERSITY, Shanghai, CN;
Abstract
The present invention belongs to the technical field of membrane-based water treatment and relates to a novel guanidine-based composite nanofiltration (NF) flat-sheet membrane, and a preparation method and application thereof. The present invention provides a method for preparing a guanidine-based composite NF flat-sheet membrane, where a dense separation layer is formed on the surface of a polyethersulfone ultrafiltration membrane through polymerization reaction between the amino group of 1,3-diaminoguanidine and the acyl chloride group of trimesoyl chloride. Under suitable reaction conditions, the guanidine-based composite NF membrane obtained according to the present invention enables effective separation of multivalent ions over a wide pH range, with a rejection rate of over 96% for 1000 ppm of MgSOsolution, and can operate continuously and stably in a mixed ions solution with a wide pH.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile