Fermentable acid hydrolyzates and fermentation process

Details Fermentable acid hydrolyzates and fermentation process Fermentable acid hydrolyzates and fermentation process

C - Chemistry, Metallurgy

12

P

195/14

C12P 7/06 (2006.01)

Patent

CA 1145277

ABSTRACT OF THE DISCLOSURE Method of preconditioning acid hydrolyzates derived from lignocellulosic materials such as sawdust or newspaper and preconditioned acid hydrolyzates are provided. The precondi- tioning negates the effect of substances which tend to inhibit fermentation and comprises a series of steps including steam- stripping, calcium oxide treatment at a pH of 10 to 10.5, ad- justing the pH to about 6 to 7 with a mineral acid and especial- ly phosphoric acid and concentrating the hydrolyzate solution to a glucose concentration of less than 150 grams per liter. Glucose contained in such preconditioned hydrolyzates is readily fermentable to ethyl alcohol,in theoretical yield, after fer- mentation for as short a period as 1 to 2 hours.

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