Patents by Inventor Xujuan HUANG

Xujuan HUANG has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method for preparing chromium(III) pyridine-2-carboxylate using 2-OP rectification residues
    Patent number: 10703720
    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 H2SO4 or 3-30 wt % dilute HCl followed by batchwise addition of CrCl3, Cr(NO3)3 or Cr2(SO4)3 for complexation at 20-70° C.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: July 7, 2020
    Assignee: YANCHENG INSTITUTE OF TECHNOLOGY
    Inventors: Zhaosheng Cai, Jinghua Yu, Pan Xu, Jinyu Bian, Ge Ding, Lili Shen, Xujuan Huang, Zhonglie Yang, Yun Chen, Peng Xu
  • METHOD FOR PREPARING CHROMIUM(III) PYRIDINE-2-CARBOXYLATE USING 2-OP RECTIFICATION RESIDUES
    Publication number: 20200109116
    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 H2SO4 or 3-30 wt % dilute HCl followed by batchwise addition of CrCl3, Cr(NO3)3 or Cr2(SO4)3 for complexation at 20-70° C.
    Type: Application
    Filed: June 25, 2019
    Publication date: April 9, 2020
    Inventors: Zhaosheng CAI, Jinghua YU, Pan XU, Jinyu BIAN, Ge DING, Lili SHEN, Xujuan HUANG, Zhonglie YANG, Yun CHEN, Peng XU