초록 ▼

A process for the production of fermentable sugars from wood or other cellulose-containing biomasses, comprises the steps of (a) hydrolysing the biomass with a dilute sulfuric acid to dissolve hemicellulose while leaving most of cellulose in a solid phase, (b) separating the cellulose-containing sol

A process for the production of fermentable sugars from wood or other cellulose-containing biomasses, comprises the steps of (a) hydrolysing the biomass with a dilute sulfuric acid to dissolve hemicellulose while leaving most of cellulose in a solid phase, (b) separating the cellulose-containing solid phase, (c) subjecting the solid phase to rapid pyrolysis at a temperature of 400°-600°C. at atmospheric pressure, preferably in a fluidized bed reactor with a short vapor residence time, to obtain a crude pyrolysis product by condensing the pyrolytic vapors, (d) adjusting the water content of the crude product to form an aqueous phase with high carbohydrate content and a water-insoluble phase containing lignin-derived material, and (e) separating the aqueous phase. Optionally, the aqueous phase may be purified, e.g. by absorption.

대표청구항 ▼

A process for the production of fermentable sugars from cellulose-containing biomass, the process comprising the steps of: (a) treating the biomass with a dilute acid capable of dissolving hemicellulose wherein the time and temperature of the treatment and the acid strength are selected so as to obt

A process for the production of fermentable sugars from cellulose-containing biomass, the process comprising the steps of: (a) treating the biomass with a dilute acid capable of dissolving hemicellulose wherein the time and temperature of the treatment and the acid strength are selected so as to obtain a liquid phase containing most of the biomass hemi-cellulose and a solid phase containing most of the biomass cellulose. (b) separating the cellulose-containing solid phase from the liquid base, (c) subjecting the resulting solid phase to rapid pyrolysis at atmospheric pressure and at a temperature in the range 400°C.-600°C. so as to obtain a crude product containing sugars and anhydrosugars, in a reactor where the residence time of pyrolytic vapors is less than about 2 seconds, (d) adjusting the water content of the crude product to form an aqueous phase containing fermentable carbohydrates and a water-insoluble phase, and (e) separating the aqueous phase from the water-insoluble phase.