C - Chemistry – Metallurgy – 12 – P
Patent
C - Chemistry, Metallurgy
12
P
195/2
C12P 7/06 (2006.01)
Patent
CA 1138798
ABSTRACT OF THE DISCLOSURE This invention relates to a process for producing ethan- ol by continuous fermentation of polysaccharide-containing raw materials. The fermentation is carried out in one or several fermentors, a flow of fermentation liquor being separated into a yeast concentrate flow and a yeast-free flow, and possibly one sludge flow, of which the yeast concentrate flow is recirculated to the fermentor, at least part of the yeast-free flow being fed to a simple evaporator unit, corresponding to one or a few dis- tilling stages, wherein it is separated, partly into a first vapour flow, enriched in ethanol, which is fed to a plant for production of the desired ethanol grade, and partly into a first liquid bottom flow, which is at least in part recirculated to the fermentor. Especially characterizing for the new process is, that a raw material flow is fed to a circulation circuit, comprising said fermentor and said evaporator unit, and that the raw mater- ial flow is hydrolysed, in the evaporated unit, to a fermentable state. It is especially advantageous to carry out this hydroly- sis by enzymes, preferably by a gluco-amylase at a temperature within the range 35°C to 75°C.
361241
Alfa-Laval Ab
Marks & Clerk
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