发明名称 |
Process for producing 2,6-naphthalenedicarboxyl acid |
摘要 |
<p>A process for producing 2,6-naphthalenedicarboxylic acid comprising oxidizing 2,6-dimethylnaphthalene with a gas containing oxygen in a solvent comprising a lower aliphatic carboxylic acid in the presence of a catalyst comprising cobalt, manganese, and bromine, wherein the total amount of cobalt and manganese in the catalyst is 50 to 300 mg atom per 1 g mol of 2,6-dimethylnaphthalene, a ratio by g atom of manganese to cobalt in the catalyst is 20:1 to 4:1, and the oxidation is conducted at a temperature of 200 to 250 DEG C; and a process as described above, wherein a mother liquor which is obtained from a slurry of a product of the oxidation via a step of solid-liquid separation is recyled to a step of oxidation after heat treatment at a temperature of 150 DEG C or higher. In accordance with the processes, accumulation of substances which affect the oxidation adversely is prevented. Moreover, a large fraction of a mother liquor of oxidation can be recycled without decrease in the yield of the reaction, and the catalyst components and the solvent components in the mother liquor of oxidation can be utilized efficiently. <IMAGE></p> |
申请公布号 |
EP0872470(A2) |
申请公布日期 |
1998.10.21 |
申请号 |
EP19980106030 |
申请日期 |
1998.04.02 |
申请人 |
MITSUBISHI GAS CHEMICAL COMPANY, INC. |
发明人 |
OHKOSHI, FUMIO,;OGAWA, HIROSHI,;TANAKA, KAZUO,;INARI, MASATO,;MACHIDA, HIROSHI |
分类号 |
C07C51/265;(IPC1-7):C07C51/265;C07C63/38 |
主分类号 |
C07C51/265 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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