Sugar production by decrystallization and hydrolysis of...

C - Chemistry – Metallurgy – 13 – K

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C13K 1/00 (2006.01) C08H 8/00 (2010.01) C13K 1/02 (2006.01) C13K 13/00 (2006.01)

Patent

CA 2739707

Sugar solutions are obtained from polysaccharide enriched biomass by contacting biomass with water and at least one nucleophilic base to produce a polysaccharide enriched biomass comprising a solid fraction and a liquid fraction. The solid fraction is separated from the lignin-containing liquid fraction and contacted with an acid solution, the acid solution comprising about 70 weight percent to about 100 weight percent sulfuric acid or an acid mixture comprising phosphoric acid and sulfuric acid, at a temperature and for a reaction time sufficient to produce a decrystallized biomass mixture. Water is added and the diluted biomass mixture is then hydrolyzed to produce a saccharification product comprising sugars.

Selon l'invention, des solutions de sucre sont obtenues de biomasse enrichie en polysaccharide par la mise en contact d'une biomasse avec de l'eau et au moins une base nucléophile afin de produire une biomasse enrichie en polysaccharide qui comporte une fraction solide et une fraction liquide. La fraction solide est séparée de la fraction liquide contenant de la lignine et mise en contact avec une solution acide, la solution acide comportant environ 70 pour cent en poids à environ 100 pour cent en poids d'acide sulfurique ou d'un mélange acide comportant de l'acide phosphorique et de l'acide sulfurique, à une température et pendant une durée de réaction suffisante pour produire un mélange de biomasse non cristallisé. De l'eau est ajoutée, et le mélange de biomasse dilué est ensuite hydrolysé afin de produire un produit de saccharification comportant des sucres.

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