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The production of acetone and butanol fermentation in the production of acetone and n-butanol (abbreviated propi-butyl or acetone-butanol) began in 1913. After the outbreak of the first world war, acetone was used to produce a surge in the use of explosives and airfoil coatings. Britain first reformed the wine factory as the propion plant, and then established branches around the world, producing the propyl din on a large scale from corn. With acetone and at the same time after the war was about 2 times the amount of n-butyl alcohol was found available value, c, d industrial recession pause, n-butyl alcohol was found to be best for the manufacture of butyl acetate as a cellulose nitrate, solvent, the industrial new again. At present, although acetone and n-butanol are mainly produced by methods, the fermentation of propion is still a significant proportion.

The fermentation process

Propionic fermentation is a strict anaerobic fermentation, and the production of the bacteria is c. c. diffusium, with starch, sugar and fiber as medium. Propionic fermentation can be used in batches or continuous fermentation. The large-scale industrial production is mainly used in continuous fermentation (FIG. 1) continuous process of the continuous p-ding fermentation process. Will be qualified BingDing strains in vitro cant access 61 seed bottle, in 38 + / - 1 ℃, cultivate 18 ~ 22 h; Then access seeds cans, in 40 ~ 41 ℃ for 24 h, microscopy after qualified input activation tank, in 40 ~ 41 ℃ for 4 h, and then from the upper activation can continue to come into cooking mash (after sterilization and cooling the material liquid), the activation of the seed liquid flowing from activation at the bottom of the tank fermentation tank; Several fermentation tanks are connected in series, and the fermented mash flows in and out, from the first can to the last can from 24 to 36h. The mature fermentation of fermented mash is obtained from the distillation of the polythol, respectively obtained acetone, n-butanol, ethanol and oil. The quality ratio of acetone butanol and ethanol is 3:6:1, and the total solvent of the total solvent is 1.7t, respectively. The mass ratio of hydrogen is 2.7%, while the CO is 97.3%, because the raw material and the bacteria are different, the solvent ratio and the exhaust ratio are different.