Procedure for recovering soluble carbo-hydrates contained in...

Details Procedure for recovering soluble carbo-hydrates contained in... Procedure for recovering soluble carbo-hydrates contained in...

C - Chemistry, Metallurgy

13

K

260/227

C13K 1/02 (2006.01) C13K 13/00 (2006.01)

Patent

CA 1234803

Abstract of Disclosure The invention concerns a procedure for recovery of soluble carbo- hydrates present in wood, in connection with the alkaline cellulose digesting process. According to the invention, recovery of carbo- hydrates takes place at the initial phase of the cellulose digest- ing process, where the digesting solution contains dissolved poly- saccharides in abundance, while the content of polymeric lignin in the solution is low. A situation like this exists at the stage when the digesting solution has not yet reached the temperature at which the digestion process mainly takes place. As taught by the inven- tion, the carbohydrates are recovered by conducting digesting solu- tion to an ultrafilter, which separates the carbohydrates there- from, and by returning the filtered solution to the cellulose digestion. The carbohydrates that are obtained may be used e.g. in the manufacturing of sugar alcohols, or as raw materials for biotechnical processes.

482811

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