发明名称 |
USE OF A MULTI-LAYER CATALYST FOR PRODUCING PHTHALIC ANHYDRIDE |
摘要 |
The present invention relates to the use of a catalyst comprising at least one first catalyst zone located towards the gas inlet, a second catalyst zone located closer to the gas outlet and a third catalyst zone located even closer to or at the gas outlet for the preparation of phthalic anhydride by gas-phase oxidation of o-xylene and/or naphthalene, with the catalyst zones preferably each having an active composition comprising TiO2, characterized in that the catalyst activity of the first catalyst zone is higher than the catalyst activity of the second catalyst zone. Furthermore, a preferred process for the preparation of phthalic anhydride is described. |
申请公布号 |
EP1853386(A1) |
申请公布日期 |
2007.11.14 |
申请号 |
EP20060707386 |
申请日期 |
2006.03.02 |
申请人 |
SUED-CHEMIE AG |
发明人 |
GUECKEL, CHRISTIAN;DIALER, HARALD;ESTENFELDER, MARVIN;PITSCHI, WERNER |
分类号 |
B01J35/00;B01J23/22;B01J27/198;C07C51/265;C07C51/31;C07C63/16 |
主分类号 |
B01J35/00 |
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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