Patents by Inventor Keke Cheng

Keke Cheng 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 producing 1,3-propanediol and 2,3-butanediol from raw starch material
    Patent number: 7968319
    Abstract: The invention discloses a method for producing 1,3-propanediol and 2,3-butanediol from raw starch materials, including the following steps: 1) Candida krusei or Hansenula Arabitolgens Fang are inoculated into a fermentation medium with the saccharifying liquid of the raw starches as a carbon source; the yeast cells are cultured on an aerobic condition until glucose-consuming-rate is significantly reduced, and then fermented anaerobically to a glucose concentration from 5 to 10 g/L; the fermentation broth is collected and filtered to remove the yeast cells in the broth, and the resultant filtrate is glycerin fermentation broth; 2) Klebsiella, Clostridium butyricum, or Clostridium pasteurianum are inoculated into a fermentation medium in which the glycerin fermentation broth obtained from step 1) serves as a carbon source; the bacteria are fermented anaerobically for 30-32 hours, and then fermented aerobically when the production rate of 1,3-propanediol decreased obviously, and the fermentation was stopped when
    Type: Grant
    Filed: June 13, 2006
    Date of Patent: June 28, 2011
    Assignee: Tsinghua University
    Inventors: Dehua Liu, Keke Cheng, Hongjuan Liu, Rihui Lin, Jian Hao
  • METHOD FOR PRODUCING 1,3-PROPANEDIOL AND 2,3-BUTANEDIOL FROM RAW STARCH MATERIAL
    Publication number: 20090081745
    Abstract: The invention discloses a method for producing 1,3-propanediol and 2,3-butanediol from raw starch materials, including the following steps: 1) Candida krusei or Hansenula Arabitolgens Fang are inoculated into a fermentation medium with the saccharifying liquid of the raw starches as a carbon source; the yeast cells are cultured on an aerobic condition until glucose-consuming-rate is significantly reduced, and then fermented anaerobically to a glucose concentration from 5 to 10 g/L; the fermentation broth is collected and filtered to remove the yeast cells in the broth, and the resultant filtrate is glycerin fermentation broth; 2) Klebsiella, Clostridium butyricum, or Clostridium pasteurianum are inoculated into a fermentation medium in which the glycerin fermentation broth obtained from step 1) serves as a carbon source; the bacteria are fermented anaerobically for 30-32 hours, and then fermented aerobically when the production rate of 1,3-propanediol decreased obviously, and the fermentation was stopped when
    Type: Application
    Filed: June 13, 2006
    Publication date: March 26, 2009
    Applicant: Tsinghua Yuan
    Inventors: Dehua Liu, Keke Cheng, Hongjuan Liu, Rihui Lin, Jian Hao