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    • 7. 发明授权
    • Process for producing aromatic carboxylic acid
    • 芳香族羧酸的制造方法
    • US06506931B1
    • 2003-01-14
    • US09656997
    • 2000-09-07
    • Masayasu IshibashiHiroshi Tomita
    • Masayasu IshibashiHiroshi Tomita
    • C07C51255
    • C07C51/265C07C63/26
    • A process for producing an aromatic carboxylic acid by a liquid phase oxidation of an alkylaromatic compound with molecular oxygen in a reaction solvent comprising a lower aliphatic carboxylic acid in the presence of an oxidation catalyst, in which an aromatic carboxylic acid having an improved hue of the powdery product thereof and exhibiting an improved light transmittance when dissolved in an aqueous solution of a base can be produced efficiently in a simple manner by suppressing contamination due to the intermediates and by-products formed by side reactions, the said process comprising performing the liquid phase oxidation of the alkylaromatic compound in the presence of a hydrogen gas-treated liquid containing the catalyst.
    • 在氧化催化剂存在下,通过在含有低级脂肪族羧酸的反应溶剂中通过烷基芳族化合物与分子氧进行液相氧化来制备芳族羧酸的方法,其中具有改进的色调的芳族羧酸 通过抑制由副反应形成的中间体和副产物引起的污染,可以以简单的方式有效地制备溶解在碱的水溶液中时提高其透光度的粉末状产物,所述方法包括进行液相 在含有催化剂的氢气处理液体存在下,烷基芳族化合物的氧化。
    • 9. 发明授权
    • Process for producing polyethylene naphthalate
    • 生产聚萘二甲酸乙二醇酯的方法
    • US5811513A
    • 1998-09-22
    • US860701
    • 1997-07-09
    • Hiroshi IwasakiMasayasu IshibashiHiromi UekiShoji HiraokaToru MatsuyoshiSatoshi Inoki
    • Hiroshi IwasakiMasayasu IshibashiHiromi UekiShoji HiraokaToru MatsuyoshiSatoshi Inoki
    • C08G63/189C08G63/672C08G63/78C08G63/82
    • C08G63/189C08G63/78C08G63/82
    • In the production of polyethylene naphthalate of the present invention, the esterification reaction between naphthalenedicarboxylic acid and ethylene glycol is conducted while causing water to be present in a reaction system from a start of reaction, in the presence of at least one catalyst selected from the group consisting of nitric, carboxylic, phosphoric and hydrogenphosphoric acid metal salts and alkyl amines according to necessity, to thereby attain an esterification ratio of 45 to 80%, so that a liquid mixture of naphthalenedicarboxylic acid esterification reaction products containing naphthalenedicarboxylic acid, carboxyl-hydroxyethoxycarbonylnaphthalene and bis(hydroxyethoxycarbonyl)naphthalene is obtained. Subsequently, a crystallized reaction product is separated from this liquid mixture to thereby obtain a mixture of esterification reaction products. Thereafter, this mixture having ethylene glycol added thereto according to necessity is subjected to polycondensation. The polyethylene naphthalate obtained by the process of the present application ensures a low content of naphthalenedicarboxylic acid esters each having diethylene glycol skeleton therein, thereby having excellent quality, for example, in appearance.
    • PCT No.PCT / JP96 / 03116 Sec。 371日期1997年7月9日第 102(e)日期1997年7月9日PCT 1996年10月25日PCT公布。 公开号WO97 / 17391 日期1997年5月15日在本发明的聚萘二甲酸乙二醇酯的制造中,在反应开始时,在存在至少一种催化剂的同时,使反应体系中存在水,进行萘二甲酸与乙二醇的酯化反应 根据需要选自硝酸,羧酸,磷酸和氢磷酸金属盐和烷基胺,从而达到45-80%的酯化比,使得含萘二羧酸的萘二甲酸酯化反应产物的液体混合物, 羧基 - 羟基乙氧基羰基萘和双(羟基乙氧基羰基)萘。 随后,从该液体混合物中分离出结晶的反应产物,由此得到酯化反应产物的混合物。 然后,将根据需要添加有乙二醇的混合物进行缩聚。 通过本申请的方法获得的聚萘二甲酸乙二醇酯确保了在其中具有二甘醇骨架的低含量的萘二羧酸酯,从而具有优异的质量,例如外观。