Granular product of parahydroxybenzoic acid or...

Details Granular product of parahydroxybenzoic acid or... Granular product of parahydroxybenzoic acid or...

C - Chemistry, Metallurgy

07

C

C07C 65/03 (2006.01) C07C 69/84 (2006.01) C07C 69/88 (2006.01)

Patent

CA 2413514

Granules of parahydroxybenzoic acid or a parahydroxybenzoic ester which are extremely inhibited from flying off or caking; and a process for producing the granules. The granules of parahydroxybenzoic acid or an ester thereof have an average particle diameter of 150 µm or larger and a hardness of 10 to 3,000 g. The process comprises compacting a dry powder of parahydroxybenzoic acid or an ester thereof to form a molding, crushing the molding, and classifying the resultant particles.

La présente invention concerne des granulés d'acide parahydroxybenzoïque ou d'un ester d'acide parahydroxybenzoïque, qui ne s'envolent pas et ne s'agglomèrent pas, ainsi qu'un procédé pour produire ces granulés. Les granulés d'acide parahydroxybenzoïque ou d'un ester d'acide parahydroxybenzoïque présentent un diamètre particulaire moyen supérieur ou égal à 150 mu m et une dureté allant de 10 à 3 000 g. Le procédé selon cette invention consiste à compacter une poudre sèche d'acide parahydroxybenzoïque ou d'un ester d'acide parahydroxybenzoïque, afin de former un moulage, à écraser le moulage, puis à classer les particules résultantes.

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