Method for purifying crystalline substance

Details Method for purifying crystalline substance Method for purifying crystalline substance

C - Chemistry, Metallurgy

07

C

C07C 15/24 (2006.01) B01D 9/02 (2006.01) C07B 63/00 (2006.01) C07C 7/14 (2006.01)

Patent

CA 2241571

A method for purifying a particular substance contained in a mixture, comprising the following steps (1) and (2a) or (2b) and permitting a particular substance having high purity to be relatively simply recovered in a high yield from a mixture containing the same: (1) subjecting the raw material mixture in a liquid form or a slurry form wherein part of the particular substance has crystallized to crystallization under high pressure to increase the amount of the crystals of the particular substance to prepare crystals enriched with the particular substance; and (2a) dissolving the crystals enriched with the particular substance in a solvent capable of well dissolving the crystals and subjecting the solution to crystallization under cooling to recrystallize the particular substance; or (2b) washing the crystals enriched with the particular substance with a solvent capable of dissolving the crystal.

Cette invention concerne un procédé de purification d'une substance particulière contenue dans un mélange, lequel procédé permet d'obtenir à partir dudit mélange une substance d'une grande pureté de manière relativement simple et en grandes quantités, et comprend les étapes (1) et (2a) ou (2b), à savoir: (1) soumettre le mélange de matières brutes se présentant sous forme de liquide ou de bouillie, et dans lequel une partie de la substance particulière s'est cristallisée, à une cristallisation sous haute pression de manière à accroître la quantité de cristaux de ladite substance particulière et à préparer ainsi des cristaux enrichis de cette substance; et (2a) dissoudre les cristaux enrichis de cette substance particulière dans un solvant qui soit capable de bien dissoudre les cristaux, puis soumettre la solution à une cristallisation dans des conditions de refroidissement de manière à recristalliser la substance particulière; ou (2b) laver les cristaux enrichis de cette substance particulière à l'aide d'un solvant capable de dissoudre le cristal.

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