Patents by Inventor WOYUAN LI

WOYUAN LI 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).

  • Publication number: 20210047471
    Abstract: The disclosure relates to a high molecular weight polyphenylene sulfide resin and a preparation method and application thereof. The disclosure uses a sulfur-containing compound and a halogenated aromatic compound as raw materials, an alkaline compound and a fatty acid as polycondensation aids to carry out a polycondensation reaction. After purification treatment, a primary polyphenylene sulfide is obtained. Then, the primary polyphenylene sulfide reacts with a chain extender at a high temperature to form a high molecular weight polyphenylene sulfide resin. The preparation method of the disclosure has the advantages of high yield, low cost, and is capable of selectively and controllably preparing polyphenylene sulfide resins with different melt viscosities and molecular weights, and the obtained polyphenylene sulfide resins have excellent heat resistance.
    Type: Application
    Filed: August 23, 2019
    Publication date: February 18, 2021
    Inventors: Zhirong CHEN, Woyuan LI, Hong YIN, Baishan HU, Guiyang ZHOU, Ming LIAN, Guangde QIN, Hangjun DENG, Xiongwei ZHANG, Guisheng QIU, Kejun WU
  • Publication number: 20210009514
    Abstract: The present disclosure discloses a preparation method for 4-phenylthio-benzenethiol. The preparation method comprises the following steps: subjecting phenyl sulfide as a raw material to a halogenation reaction to obtain 4-halophenyl sulfide; subjecting the 4-halophenyl sulfide to a sulfhydrylation reaction to obtain a 4-phenylthio-phenylthiolate; and subjecting the 4-phenylthio-phenylthiolate to acidification. The preparation method of the present disclosure avoids the use of materials such as thiophenol which pollutes the environment, and realizes efficient recycling of the reaction materials, solvents, water and the like. The preparation method of the present disclosure is a green process for the synthesis of 4-phenylthio-phenylthiol without organic waste, waste acid and waste water discharge.
    Type: Application
    Filed: July 12, 2018
    Publication date: January 14, 2021
    Applicants: Zhejiang NHU Company Ltd, Zhejiang University, Zhejiang NHU Special Materials Co., Ltd.
    Inventors: Zhirong CHEN, Woyuan LI, Hong YIN, Guíyang ZHOU, Haoran LI, Shuaifeng PAN, Ming LIAN, Guangde QIN, Qichuan LI
  • Publication number: 20200347186
    Abstract: The present application relates to a method for extracting coenzyme Q10 and a phospholipid from a coenzyme Q10 fermentation bacterium powder. The method is characterized in that the fermentation bacterium powder of a coenzyme Q10 production strain is subjected to extraction with a mixed solvent of which the three-dimensional Hansen solubility parameter is between 21 and 23 (J/cm3)1/2 and the hydrogen bonding solubility parameter thereof is between 10 and 12 (J/cm3)1/2. The present invention can efficiently extract two products, namely coenzyme Q10 and a phospholipid, from the coenzyme Q10 fermentation bacterium powder; the process thereof is highly operable, easy to be industrialized, and can provide a product with high purity and yield, having great economic benefit.
    Type: Application
    Filed: July 12, 2018
    Publication date: November 5, 2020
    Inventors: Woyuan LI, Hong YIN, Zhirong CHEN, Baishan HU, Guiyang ZHOU, Hangjun DENG, Ming LIAN, Xiongwei ZHANG, Qichuan LI, Jiang ZHAO
  • Patent number: 9567440
    Abstract: The present invention discloses a fiber-grade polyphenylene sulfide resin synthesis method, taking sodium bisulfide and p-dichlorobenzene as raw materials, N-methyl pyrrolidone as the solvent and C5-C6 fatty acid salt formed through dehydration to C5-C6 fatty acid and sodium hydroxide as the polymerization additive for synthesis through polymerization. White polyphenylene sulfide resin is obtained through acidification and washing of reaction slurry. In view of the fact that MFR is below 125 g/10 min, weight-average molecular weight as measured by GPC is over 4.2×104, and whiteness is over 90, it can satisfy requirements for fiber polyphenylene sulfide resin. C5-C6 fatty acid salt according to the method of the present invention has a higher solubility in NMP, which can better promote polymerization. It is to be fully diverted into the filtrate after filter prior to conversion into free fatty acid again through acidification with hydrochloric acid.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: February 14, 2017
    Assignees: ZHEJIANG NHU SPECIAL MATERIALS CO., LTD., ZHEJIANG UNIVERSITY, SHANGYU NHU BIOLOGICAL CHEMICAL CO., LTD., ZHEJIANG NHU COMPANY LTD.
    Inventors: Zhirong Chen, Woyuan Li, Haoran Li, Ming Lian, Hong Yin, Guiyang Zhou, Xinfeng Zheng
  • Publication number: 20150344632
    Abstract: The present invention discloses a fiber-grade polyphenylene sulfide resin synthesis method, taking sodium bisulfide and p-dichlorobenzene as raw materials, N-methyl pyrrolidone as the solvent and C5-C6 fatty acid salt formed through dehydration to C5-C6 fatty acid and sodium hydroxide as the polymerization additive for synthesis through polymerization. White polyphenylene sulfide resin is obtained through acidification and washing of reaction slurry. In view of the fact that MFR is below 125 g/10 min, weight-average molecular weight as measured by GPC is over 4.2×104, and whiteness is over 90, it can satisfy requirements for fiber polyphenylene sulfide resin. C5-C6 fatty acid salt according to the method of the present invention has a higher solubility in NMP, which can better promote polymerization. It is to be fully diverted into the filtrate after filter prior to conversion into free fatty acid again through acidification with hydrochloric acid.
    Type: Application
    Filed: October 29, 2013
    Publication date: December 3, 2015
    Applicant: ZHEJIANG NGU SPECIAL MATERIALS CO., LTD.
    Inventors: ZHIRONG CHEN, WOYUAN LI, HAORAN LI, MING LIAN, HONG YIN, GUIYANG ZHOU, XINFENG ZHENG