发明名称 |
Two stage oxidation process for the production of aromatic dicarboxylic acids |
摘要 |
Disclosed is a process for producing a benzenedicarrboxylic acid such as terephthalic acid wherein a dialkyl benzene compound and acetic acid having catalyst components dissolved therein are fed to a first reaction zone wherein the dialkyl benzene compound is oxidized with molecular oxygen to provide a first oxidation zone product comprising a benzenedicarboxylic acid containing minor amounts of mono-carboxylic acid by-products such as carboxybenzaldehyde and toluic acid. The first oxidation zone product comprising a slurry of a benzenedicarboxylic acid containing minor amounts of mono-carboxylic acid by-products is fed to a second oxidation reaction zone that is operated under more severe conditions of temperature and pressure. The rate of the feed of a molecular oxygen containing gas to the second oxidation zone is about 3% or less of the the rate of the feed of the molecular oxygen containing gas to the first oxidation zone. The benzenedicarboxylic acid product obtained contains a total concentration of carboxybenzaldehyde and toluic acid of about 150 ppmw or less.
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申请公布号 |
US2002183546(A1) |
申请公布日期 |
2002.12.05 |
申请号 |
US20020156312 |
申请日期 |
2002.05.28 |
申请人 |
SHEPPARD RONALD BUFORD;SUMNER CHARLES EDWAN;TENNANT BRENT ALAN |
发明人 |
SHEPPARD RONALD BUFORD;SUMNER CHARLES EDWAN;TENNANT BRENT ALAN |
分类号 |
C07B61/00;C07C51/265;C07C63/26;(IPC1-7):C07C51/255 |
主分类号 |
C07B61/00 |
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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