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2. 发明授权

US6153767A Production process for pyromellitic dianhydride 失效
标题翻译：均苯四甲酸二酐的制备方法
公开(公告)号：US6153767A
公开(公告)日：2000-11-28
申请号：US270742
申请日：1999-03-16
申请人： Toshio Sagane , Tsukasa Takahashi , Yasuhisa Emoto
发明人： Toshio Sagane , Tsukasa Takahashi , Yasuhisa Emoto
IPC分类号： B01J8/06 , B01J23/22 , B01J27/18 , B01J27/198 , B01J35/00 , C07C51/265 , C07D493/04
CPC分类号： C07C51/265 , B01J23/002 , B01J23/22 , B01J27/1817 , B01J27/198 , B01J35/0006 , B01J8/06 , B01J2523/00
摘要： Provided is a process for producing pyromellitic dianhydride by feeding 1,2,4,5-tetraalkylbenzene to a fixed bed multitubular type reactor charged with a catalyst layer to carry out catalytic vapor phase oxidation. This process is characterized by dividing the catalyst layer into at least two layers to charge a layer at an outlet side of reaction gas and a layer at an inlet side of raw material mixed gas with the following catalyst A and catalyst B respectively or dividing the catalyst layer into at least three layers to charge a layer at an outlet side of reaction gas, an intermediate layer and a layer at an inlet side of raw material mixed gas with the following catalyst A, catalyst B and catalyst C respectively:catalyst A: a catalyst containing V.sub.a (A).sub.b P.sub.c Ag.sub.d (B).sub.e O.sub.x, wherein (A) represents at least one element selected from Mo and W; (B) represents at least one element selected from alkaline metals and alkaline earth metals; a to e each represent an atomic number thereof,catalyst B: a catalyst containing V.sub.a Ti.sub.b (C).sub.c (D).sub.d Ce.sub.e O.sub.x wherein (C) represents at least one element selected from rare earth elements (excluding cerium); (D) represents at least one element selected from P, Sb, Hf, Nb, T, B and S; a to e and x each represent an atomic number thereof, andcatalyst C: a catalyst containing V.sub.a (E).sub.b (F).sub.c (G).sub.d O.sub.x, wherein (E) represents at least one element selected from alkaline metals; (F) represents at least one element selected from P and Cu; (G) represents at least one element selected from silver, sulfur, tantalum, boron, tungusten, and molybdenum; a to d and x each represent an atomic number thereof.
摘要翻译：本发明提供了一种通过将1,2,4,5-四烷基苯供给到装有催化剂层的固定床多管式反应器中进行催化气相氧化来制备均苯四酸二酐的方法。该方法的特征在于将催化剂层分成至少两层，以分别将催化剂A和催化剂B分别装入反应气体的出口侧的层和原料混合气入口侧的层，或分离催化剂层至少三层，以分别在反应气体的出口侧，原料混合气体的中间层和入口侧的层与以下催化剂A，催化剂B和催化剂C分别充电：催化剂A：a 含有Va（A）bPcAgd（B）eOx的催化剂，其中（A）表示选自Mo和W中的至少一种元素; （B）表示选自碱金属和碱土金属中的至少一种元素; a至e各自表示其原子序数，催化剂B：含有VaTib（C）c（D）dCeeO x的催化剂，其中（C）表示选自稀土元素（不包括铈）中的至少一种元素; （D）表示选自P，Sb，Hf，Nb，T，B和S中的至少一种元素; a至e和x各自表示其原子序数，催化剂C：含有Va（E）b（F）c（G）dOx的催化剂，其中（E）表示选自碱金属的至少一种元素; （F）表示选自P和Cu中的至少一种元素; （G）表示选自银，硫，钽，硼，钨和钼中的至少一种元素; a至d和x各自表示其原子序数。

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