Process for the production of melamine crystals at high...

C - Chemistry – Metallurgy – 07 – D

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C07D 251/62 (2006.01) C07D 251/60 (2006.01)

Patent

CA 2404096

A process for producing melamine crystals at high pureness is distinguished by the fact that it comprises a crys- tallisation step of a flow comprising substantially pure melt melamine by cooling with liquid ammonia and a thickening step of the resulting suspension of melamine crystals in liquid ammonia by separation of a portion of the liquid ammonia present in said sus- pension, whereby the liquid ammonia separated in said thickening step is reused as coolant in the crystallisation step. Also disclosed is a plant for producing melamina crystals at high pureness, comprising a crystallisation section (6) and a thickening section (7).

La présente invention concerne un procédé de production de cristaux de mélamine de grande pureté, caractérisé en ce qu'il comprend une opération de cristallisation d'un flux à base de mélamine de fusion sensiblement pure consistant à le faire refroidir avec de l'ammoniaque liquide, et une opération d'épaississement de la suspension de cristaux de mélamine obtenue dans l'ammoniaque liquide consistant à séparer une partie de l'ammoniaque liquide contenu dans la suspension, l'ammoniaque liquide séparé dans la dernière opération étant réutilisé comme liquide de refroidissement dans l'opération de cristallisation. En outre, cette invention concerne une installation de production de cristaux de mélamine de grande pureté, comportant une section (6) de cristallisation et une section (7) d'épaississement.

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