公开(公告)号：US5895821A

公开(公告)日：1999-04-20

申请号：US940718

申请日：1997-09-30

申请人： Rashmikant Maganlal Contractor ,  Harold Saul Horowitz ,  Gregory Scott Patience ,  John Donal Sullivan

发明人： Rashmikant Maganlal Contractor ,  Harold Saul Horowitz ,  Gregory Scott Patience ,  John Donal Sullivan

IPC分类号： B01J27/198 ,  C07D307/60

CPC分类号： C07D307/60 ,  B01J23/002 ,  B01J27/198 ,  B01J2523/00

摘要： An improved process for calcination and activation of a catalyst containing mixed oxides of vanadium and phosphorus (V/P/O) involving the addition of spray dried catalyst precursor to a fluidizing oxygen containing gas at a controlled rate such that the temperature is maintained at a range of 370 to 410.degree. C. (preferably 390.+-.5.degree. C.). The catalyst precursor experiences, in addition to rapid temperature rise, dehydration/calcination at this elevated temperature in the fluidized state for an average range of residence time of less than about 4 hours at 3.5 atm of air or above, and up to 20 hours at 1 atm of air while simultaneously and continuously maintaining an average V.sub.ox of 4.55 or less. Such a process is useful in preparing a V/P/O catalyst that exhibits enhanced activity for the oxidation of n-butane to maleic anhydride. The novel process also provides an improved method for start-up of a commercial scale recirculating solids reactor.

摘要翻译： 一种用于煅烧和活化含有钒和磷的混合氧化物（V / P / O）的催化剂的改进方法，其涉及将喷雾干燥的催化剂前体以受控的速率加入到含流化气体的气体中，使得温度保持在 范围为370至410℃（优选390 +/- 5℃）。 除了快速升温之外，催化剂前体还经历在流化状态下的这个升高温度下的脱水/煅烧，在3.5atm空气或以上的平均停留时间范围小于约4小时，并且在高达20小时 1atm的空气，同时且连续地维持4.55或更低的平均Vox。 这种方法可用于制备对正丁烷氧化成马来酸酐具有增强的活性的V / P / O催化剂。 该新方法还提供了一种用于启动商业规模循环固体反应器的改进方法。