公开(公告)号：US06579990B2

公开(公告)日：2003-06-17

申请号：US09933075

申请日：2001-08-21

申请人： Kazuo Tanaka ,  Atsushi Okoshi ,  Kengi Nakaya

发明人： Kazuo Tanaka ,  Atsushi Okoshi ,  Kengi Nakaya

IPC分类号： C07D49300

CPC分类号： C07C51/56 ,  C07C51/43 ,  C07C51/573 ,  C07C63/313

摘要： A process for refined pyromellitic anhydride which comprises dissolving crude pyromellitic acid or crude pyromellitic anhydride in water, then cooling an aqueous solution thus obtained to perform crystallization as pyromellitic acid, then separating a crystal thus obtained from water, then anhydrating the crystal of pyromellitic acid thus separated with heating to produce pyromellitic anhydride, then vaporizing pyromellitic anhydride thus produced, cooling vapor of pyromellitic anhydride thus obtained, and thereby, recovering a refined crystal of pyromellitic anhydride.

公开(公告)号：US6063938A

公开(公告)日：2000-05-16

申请号：US900875

申请日：1997-07-25

申请人： Kazuo Tanaka ,  Kengi Nakaya ,  Atsushi Ohkoshi ,  Hideaki Fujita

发明人： Kazuo Tanaka ,  Kengi Nakaya ,  Atsushi Ohkoshi ,  Hideaki Fujita

IPC分类号： C07D315/00 ,  C07D309/00

CPC分类号： C07D315/00

摘要： Disclosed is a process for producing .epsilon.-caprolactone which comprises distilling a reaction mixture obtained by oxidation of cyclohexanone to separate impurities, wherein .epsilon.-caprolactone separated in a rectifying column is contacted with an oxygen-containing gas and then distilled. Thereby, a high quality of .epsilon.-caprolactone of in which no coloration occurs during long time preservation can be produced by industrial advantages.

摘要翻译： 公开了一种生产ε-己内酯的方法，其包括将通过环己酮氧化获得的反应混合物蒸馏到分离的杂质中，其中在精馏塔中分离的ε-己内酯与含氧气体接触，然后蒸馏。 因此，通过工业上的优点，可以制造长时间保存时不发生着色的高品质的ε-己内酯。

公开(公告)号：US6013831A

公开(公告)日：2000-01-11

申请号：US69815

申请日：1998-04-30

申请人： Hiroshi Machida ,  Fumiya Zaima ,  Kengi Nakaya ,  Kazuo Tanaka

发明人： Hiroshi Machida ,  Fumiya Zaima ,  Kengi Nakaya ,  Kazuo Tanaka

IPC分类号： C07C51/265 ,  C07C67/08 ,  C07C67/52 ,  C07C67/48

CPC分类号： C07C67/08 ,  C07C51/265 ,  C07C67/52

摘要： A process for the production of high-purity dimethyl 2,6-naphthalenedicarboxylate, which comprises esterifying 2,6-naphthalenedicarboxylic acid obtained by liquid phase oxidation of 2,6-dialkylnaphthalene with molecular oxygen in the presence of an oxidation catalyst, with methanol and then purifying a crude ester formed by the esterification, the crude ester being purified in the presence of an aromatic hydrocarbon as a solvent, in which impurities contained in a reaction product obtained by the esterification of 2,6-naphthalenedicarboxylic acid prepared by the liquid phase oxidation of 2,6-dialkylnaphthalene are effectively removed with simple procedures, oxidation catalyst metals are recovered, a crystal of naphthalenedicarboxylic acid formed by the oxidation of dialkylnaphthalene and/or its oxide derivative can be easily separated, and the oxidation catalyst to be brought into the step of producing dimethyl naphthalenedicarboxylate is recovered in the process of the production of naphthalenedicarboxylic acid and effectively used in the process of the production of naphthalenedicarboxylic acid.

摘要翻译： 一种制备高纯度2,6-萘二甲酸二甲酯的方法，其包括在氧化催化剂存在下，通过用分子氧将2,6-二烷基萘液相氧化得到的2,6-萘二羧酸与甲醇和 然后纯化通过酯化形成的粗酯，粗酯在作为溶剂的芳族烃存在下纯化，其中通过由液相制备的2,6-萘二甲酸酯化得到的反应产物中所含的杂质 通过简单的方法有效地除去2,6-二烷基萘的氧化，回收氧化催化剂金属，可以容易地分离通过二烷基萘和/或其氧化物衍生物的氧化形成的萘二甲酸的结晶，并将氧化催化剂 在生产n的过程中回收生产二甲基萘二甲酸二甲酯的步骤 邻苯二甲酸二羧酸，有效用于生产萘二羧酸的方法。