发明名称 |
Method for producing phthalic anhydride |
摘要 |
The invention relates to a process for preparing phthalic anhydride, in which the catalytic gas-phase oxidation of o-xylene and/or naphthalene is carried out over at least three zones of catalysts of increasing activity, with only the last zone of the catalyst system containing phosphorus and the last zone also comprising at least 10% by weight of vanadium (calculated as V<SUB>2</SUB>O<SUB>5</SUB>) based on the active composition of the catalyst and having a ratio of vanadium (calculated as V<SUB>2</SUB>O<SUB>5</SUB>) to phosphorus of greater than 35.
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申请公布号 |
US7390911(B2) |
申请公布日期 |
2008.06.24 |
申请号 |
US20040557705 |
申请日期 |
2004.05.15 |
申请人 |
BASF AKTIENGESELLSCHAFT |
发明人 |
NETO SAMUEL;ZUEHLKE JUERGEN;STORCK SEBASTIAN;ROSOWSKI FRANK |
分类号 |
C07D307/89;C07C51/265;C07C51/31 |
主分类号 |
C07D307/89 |
代理机构 |
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地址 |
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