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Witkamp, G.J. (author), Vrijenhoef, J.P. (author), De Graauw, J. (author), Van der Ham, F. (author)The invention is directed to a process for recovering a crystalline material from an aqueous solution, which solution also contains organic contaminants, in which process the material is crystallised from the aqueous solution by freeze crystallising at a eutectic freezing point of the solution.patent 2001