Abstract:
Disclosed is a method for preparing an aromatic carboxylic acid comprising oxidizing in the liquid phase an aromatic feed compound containing at least one alkyl or acyl group with a molecular oxygen-containing gas, in a solvent comprising a low molecular weight aliphatic carboxylic acid, and in the presence of a heavy metal oxidation catalyst, thereby forming an oxidation reaction product mixture comprising an aromatic carboxylic acid; subsequently heating the oxidation reaction product mixture at a temperature of at least about 500 F (260 C) to form a second product mixture; and recovering from the second product mixture the aromatic carboxylic acid. The method of this invention provides for purer, larger particle size aromatic carboxylic acid product.
Abstract:
A process for preparing purified 2,6-naphthalenedicarboxylic acid comprises hydrolyzing a dialkyl-2,6-naphthalenedicarboxylate with water at a reaction temperature of at least about 450 DEG F under liquid phase condition, the amount of water present being sufficient to solubilize, at the reaction temperature, at least about 10 percent of the 2,6-naphthalenedicarboxylic acid formed. This process provides for 2,6-naphthalenedicarboxylic acid having an average particle size of at least about 100 microns.
Abstract:
Un procédé de préparation d'acide 2,6-naphtalènedicarboxylique purifié consiste à hydrolyser un dialkyle-2,6-naphtalènedicarboxylate avec de l'eau à une température de réaction d'au moins 450 °F en phase liquide, la quantité d'eau présente étant suffisante pour solubiliser, à la température de réaction, au moins environ 10 pourcent de l'acide 2,6-naphtalènedicarboxylique ainsi produit. Ce procédé permet d'obtenir un acide 2,6-naphtalènedicarboxylique dont les particules présentent une taille moyenne d'au moins environ 100 microns.
Abstract:
Disclosed is a method for preparing an aromatic carboxylic acid comprising oxidizing in the liquid phase an aromatic feed compound containing at least one alkyl or acyl group with a molecular oxygen-containing gas, in a solvent comprising a low molecular weight aliphatic carboxylic acid, and in the presence of a heavy metal oxidation catalyst, thereby forming an oxidation reaction product mixture comprising an aromatic carboxylic acid; subsequently heating the oxidation reaction product mixture at a temperature of at least about 500 °F (260 °C) to form a second product mixture; and recovering from the second product mixture the aromatic carboxylic acid. The method of this invention provides for purer, larger particle size aromatic carboxylic acid product.
Abstract:
A process for preparing purified 2,6-naphthalenedicarboxylic acid comprises hydrolyzing a dialkyl-2,6-naphthalenedicarboxylate with water at a reaction temperature of at least about 450 °F under liquid phase condition, the amount of water present being sufficient to solubilize, at the reaction temperature, at least about 10 percent of the 2,6-naphthalenedicarboxylic acid formed. This process provides for 2,6-naphthalenedicarboxylic acid having an average particle size of at least about 100 microns.
Abstract:
L'invention se rapporte à un procédé de préparation d'acide carboxylique aromatique, consistant à oxyder, dans la phase liquide, un composé d'alimentation aromatique contenant au moins un groupe acyle ou alkyle avec un gaz contenant de l'oxygène moléculaire, dans un solvant comprenant un acide carboxylique aliphatique d'une faible masse moléculaire, et en présence d'un catalyseur d'oxydation à métal lourd, ce qui permet d'obtenir un mélange contenant un produit de réaction d'oxydation comprenant un acide carboxylique aromatique; après quoi, le mélange contenant le produit de réaction d'oxydation est chauffé à une température égale ou supérieure à 500 °F (260 °C) environ, pour former un second mélange contenant le produit; l'acide carboxylique aromatique étant alors récupéré de ce second mélange. Le procédé de cette invention permet d'obtenir un produit à base d'acide carboxylique aromatique plus pur et à particules de plus grande taille.