Crystallization method
AssigneeXyrofin Oy
InventorsJuha Nurmi, Olli-Pekka Eroma
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Abstract
The invention relates to a method for the recovery of xylose from xylose-containing aqueous solutions that contain over 30% by weight of xylose on dissolved dry solids. The solution is evaporated at low pressure to a solution supersaturated in respect of xylose, the solution is seeded, and the evaporation is continued at the boiling point of the solution until a crystal mass is obtained in which the xylose yield is 1 to 60%, and the xylose crystals are recovered.
Claims25
A method of crystallizing xylose from a xylose solution that contains over 30% by weight of xylose on dissolved dry solids by supersaturating the solution in respect of xylose and crystallizing the xylose from it, characterized in that the xylose-containing solution is evaporated to supersaturation at the boiling point of 40 to 80.degree. C. of the solution, the solution is seeded, and the evaporation is continued at the boiling point of the crystallization mass, until a crystallization mass is obtained which has a crystal yield of 1 to 60% on xylose, and a dry solids content of over 70%.
Dependencies are inferred from the claim text.