发明授权
- 专利标题: Process for the preparation of a microspheroidal catalyst
- 专利标题(中): 制备微球状催化剂的方法
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申请号: US10502299申请日: 2002-12-18
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公开(公告)号: US07166557B2公开(公告)日: 2007-01-23
- 发明人: Michael James Baker , Peter Johnston , Dennis Murphy
- 申请人: Michael James Baker , Peter Johnston , Dennis Murphy
- 申请人地址: GB Middlesex GB London
- 专利权人: BP Chemicals Limited,Johnson Matthey PLC
- 当前专利权人: BP Chemicals Limited,Johnson Matthey PLC
- 当前专利权人地址: GB Middlesex GB London
- 代理机构: Nixon & Vanderhye
- 优先权: GB0201378.7 20020122
- 国际申请: PCT/GB02/05761 WO 20021218
- 国际公布: WO03/061829 WO 20030731
- 主分类号: B01J23/58
- IPC分类号: B01J23/58 ; B01J23/00 ; B01J23/40 ; B01J23/72 ; B01J23/42
摘要:
Process for preparing a catalyst active for the fluid bed acetoxylation of ethylene to produce vinyl acetate. The process comprises the steps of (a) impregnating microspheroidal silica support particles by the incipient wetness technique with an aqueous solution of palladium and gold compounds, whilst agitating the support particles; (b) drying the impregnated support particles produced in step (a) whilst agitating the impregnated support particles; (c) reducing the palladium and gold compounds of the impregnated support particles produced in step (b) to respective metals by adding the dried, impregnated support particles to an aqueous solution of hydrazine, whilst stirring, to form a slurry; (d) filtration of the slurry produced in step (c) to remove the excess reduction solution; (e) washing the filter cake/slurry produced in step (d) with water and removing excess water to form a cake; (f) impregnating the cake produced in step (e) with one or more salts of Group I, Group II, lanthanide and transition metals by blending the cake produced in step (e) with one or more solid salts of Group I, Group II, lanthanide and transition metals; and (g) drying the impregnated cake produced in step (f) whilst agitating the impregnated cake to form free-flowing catalyst particles.
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