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. 07, 2020
Filed:
Jun. 25, 2019
Yancheng Institute of Technology, Yancheng, Jiangsu, CN;
Zhaosheng Cai, Jiangsu, CN;
Jinghua Yu, Jiangsu, CN;
Pan Xu, Jiangsu, CN;
Jinyu Bian, Jiangsu, CN;
Ge Ding, Jiangsu, CN;
Lili Shen, Jiangsu, CN;
Xujuan Huang, Jiangsu, CN;
Zhonglie Yang, Jiangsu, CN;
Yun Chen, Jiangsu, CN;
Peng Xu, Jiangsu, CN;
YANCHENG INSTITUTE OF TECHNOLOGY, Yangcheng, CN;
Abstract
A method for preparing chromium(III) pyridine-2-carboxylate using 2-OP rectification residues, including: subjecting the 2-OP rectification residues to in-situ catalytic pyrolysis and vacuum distillation, room-temperature crystallization and separation, recrystallization and dehydration, alkali-catalyzed hydrolysis, acidification and complexation, and separation, washing and drying to prepare a chromium(III) pyridine-2-carboxylate product, of which a yield is greater than 50% of the weight of the 2-OP rectification residues. The acidification and complexation includes: cooling the aqueous solution containing sodium pyridine-2-carboxylate obtained from the alkali-catalyzed hydrolysis to a temperature below 50° C.; adjusting the aqueous solution to pH 3.0-8.5 with 5-50 wt % dilute HSOor 3-30 wt % dilute HCl followed by batchwise addition of CrCl, Cr(NO)or Cr(SO)for complexation at 20-70° C. to obtain a slurry containing chromium(III) pyridine-2-carboxylate, which is separated, washed and dried to obtain a chromium(III) pyridine-2-carboxylate product with a purity of 98.5% or more.