Naphthalenedicarboxylic acid particles and process for the...

C - Chemistry – Metallurgy – 07 – C

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C07C 63/38 (2006.01) C07C 51/09 (2006.01) C07C 51/43 (2006.01) C08G 63/189 (2006.01)

Patent

CA 2241182

Naphthalenedicarboxylic acid (NDA) particles excellent in fluidity in slurry state, which can be produced by heating a mixture comprising naphthalenedicarboxylic acid and/or ester, an alcohol and water to prepare a solution in water/alcohol, lowering the alcohol concentration of the solution to hydrolyze the ester, precipitating naphthalenedicarboxylic acid particles, and recovering the particles.

L'invention concerne des particules d'acide naphthalènedicarboxylique présentant une excellente fluidité lorsqu'elles sont comprises dans un coulis, dont le procédé de production consiste à: chauffer un mélange contenant un acide et/ou ester naphthalènedicarboxylique, un alcool et de l'eau pour préparer une solution dont le solvant est de l'eau et de l'alcool; abaisser la concentration d'alcool de la solution pour hydrolyser l'ester; faire précipiter les particules d'acide naphthalènedicarboxylique; et récupérer les particules.

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