发明名称 |
Process for producing aromatic polycarboxylic acid |
摘要 |
A process for producing a polycarboxylic acid which comprises performing liquid phase oxidation of polyalkyl-substituted aromatic aldehyde and/or oxide derivative of polyalkyl-substituted aromatic aldehyde as raw material for oxidation with molecular oxygen at two stages in water solvent in the presence of a catalyst comprising bromine or both bromine and a heavy metal(s) at a temperature of 180 to 280 ° C., thereby producing trimellitic acid or pyromellitic acid, wherein said liquid phase oxidation is performed in a continuous operation at the first stage and in a continuous operation or in a batch operation at the second stage and a total amount of bromine in said catalyst is divided to add separately at each the first stage and the second stage.
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申请公布号 |
US6458994(B2) |
申请公布日期 |
2002.10.01 |
申请号 |
US20010861629 |
申请日期 |
2001.05.22 |
申请人 |
MITSUBISHI GAS CHEMICAL COMPANY, INC. |
发明人 |
OKOSHI ATSUSHI;URABE ETSUO;YABUNO MASASHI;OGAWA HIROSHI;TANAKA KAZUO |
分类号 |
B01J27/08;B01J27/128;C07B61/00;C07C51/235;C07C51/265;C07C63/307;C07C63/313;(IPC1-7):C07C51/16;C07C51/255 |
主分类号 |
B01J27/08 |
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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