发明授权
- 专利标题: Catalyst-precursor for the production of maleic acid anhydride and method for the production thereof
- 专利标题(中): 用于生产马来酸酐的催化剂前体及其制备方法
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申请号: US10507610申请日: 2003-03-12
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公开(公告)号: US07169732B2公开(公告)日: 2007-01-30
- 发明人: Jens Weiguny , Sebastian Storck , Mark Duda , Cornelia Dobner
- 申请人: Jens Weiguny , Sebastian Storck , Mark Duda , Cornelia Dobner
- 申请人地址: DE Ludwigshafen
- 专利权人: BASF Aktiengesellschaft
- 当前专利权人: BASF Aktiengesellschaft
- 当前专利权人地址: DE Ludwigshafen
- 代理机构: Novak Druce & Quigg LLP
- 优先权: DE10211445 20020315
- 国际申请: PCT/EP03/02506 WO 20030312
- 国际公布: WO03/078058 WO 20030925
- 主分类号: B01J27/18
- IPC分类号: B01J27/18 ; C07D307/60
摘要:
A process for preparing a vanadium, phosphorus, and oxygen catalyst precursor for preparing maleic anhydride by heterogeneously catalyzed gas-phase oxidation of a hydrocarbon having at least four carbon atoms, which comprises (a) reacting vanadium pentoxide with from 102 to 110% strength phosphoric acid in the presence of a primary or secondary, noncyclic or cyclic, unbranched or branched, saturated alcohol having from 3 to 6 carbon atoms in a temperature range from 80 to 160° C.; (b) isolating the precipitate formed; (c) setting an organic carbon content of ≦1.1% by weight in the isolated precipitate by heat treatment in a temperature range from 250 to 350° C., the heat-treated product, following the addition of 3.0% by weight of graphite, giving a powder X-ray diffraction diagram which in the 2θ region features a ratio of the height of the peak of any pyrophosphate phase present at 28.5° to the height of the peak due to the graphite at 26.6° of ≦0.1; and (d) shaping the heat-treated product obtained from step (c) into particles having an averaged diameter of at least 2 mm; a catalyst precursor obtainable from this process; a process for preparing a catalyst from the catalyst precursor; a catalyst obtainable from that process; and also a process for preparing maleic anhydride over that catalyst.