发明名称 |
Process for producing pyromellitic anhydride |
摘要 |
The present invention has for its object to provide a production method of a pyromellitic anhydride which is not only conducive to an increased catalyst life and, hence, an enhanced operating rate of a plant (reduced downtime) and a reduction in catalyst cost but also conducive to reductions in byproducts and, hence, savings in the cost of after-treatments such as collection and purification. A production method of a pyromellitic anhydride comprising a step for catalytic gas-phase oxidation of a starting mixture gas consisting of a tetraalkylbenzene and/or a trialkylbenzaldehyde and a molecular oxygen-containing gas in a fixed-bed type reactor having a catalyst bed wherein the production method of a pyromellitic anhydride is carried out under the condition that the moisture content of said starting mixture gas to be introduced into the catalyst bed is not more than 2 volume %.
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申请公布号 |
US2003032816(A1) |
申请公布日期 |
2003.02.13 |
申请号 |
US20020213083 |
申请日期 |
2002.08.07 |
申请人 |
NIPPON SHOKUBAI CO., LTD. |
发明人 |
TAKAHASHI TSUKASA;UHARA HIROYUKI;ANYOUJI KAZUO;MATSUNAMI ETSUSHIGE |
分类号 |
C07D493/04;C07B61/00;C07D403/04;(IPC1-7):C07D493/02 |
主分类号 |
C07D493/04 |
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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