The article studies hardwood polyoses (hemicelluloses), being one of renewablenatural organic materials, next to cellulose. Hardwood polyoses differ from softwood ones with regard to their content and composition; their portion in hardwoods being up to 40%. Polyoses could be converted to primary chemicals: xylose, xylitol, furfural, hydroxymethylfurfural, levulinic acid, etc. To use wood polyoses successfully we have to understand their chemical structure well.
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