Patent ID: 7968319

Claim:
A method for producing 1,3-propanediol and 2,3-butanediol from raw starch materials, including the following steps: 1) inoculating Candida krusei or Hansenula Arabitolgens Fang into a fermentation medium with the saccharifying liquid of the raw starches as a carbon source; culturing in an aerobic condition until glucose-consuming-rate is significantly reduced, and then fermenting anaerobically to a glucose concentration of 4 to 10 g/L; collecting and filtering the fermentation broth to remove the yeast cells in the fermentation broth, thereby obtaining the resultant filtrate as glycerin fermentation broth; 2) inoculating Klebsiella, Clostridium butyricum , or Clostridium pasteurianum into a fermentation medium in which the glycerin fermentation broth obtained from step 1) serves as a carbon source; fermenting the bacteria anaerobically for 30-32 hours, and then fermenting aerobically when the production rate of 1,3-propanediol decreased obviously, and stopping the fermentation when the concentration of glycerin is reduced to a level below 10 g/L, thereby obtaining 1,3-propanediol and 2,3-butanediol.