| 摘要 |
1491447 Preparation of ethylene oxide and propylene oxide IMPERIAL CHEMICAL INDUSTRIES Ltd 19 Nov 1974 [5 Dec 1973 9 Jan 1974 (2) 3 April 1974 (2) 24 May 1974 (2) 30 May 1974 (2) 5 Aug 1974 19 Aug 1974 19 Sept 1974] 56369/73 00972/74 00974/74 14786/74 14787/74 23276/74 23278/74 24071/74 24072/74 34333/74 36357/74 and 408821/74 Heading C2C [Also in Division Bl] Ethylene oxide and propylene oxide are produced by contacting the olefin with oxygen in the presence of a catalyst comprising silver supported on a preformed porous heat resisting support which has a specific surface area (B.E.T.) of 0À04-10 m.<SP>2</SP>/g., an apparent porosity (by mercury absorption) of at least 20% and a median pore diameter (by mercury porosimetry) of 0À3-15 microns, the silver having been introduced by impregnation with a solution of a decomposable silver compound, which solution is alkaline or comprises a complexing agent and reducing component, the catalyst also comprising a promoting amount of Cu, Au, Zn, Cd, Hg, Nb, Ta, Mo, W, V, Cr, Mg, Ca, Sr and/or Ba, and Na, K, Rb and/or Cs in excess of any present in the preformed support as impurities or cements. For ethylene oxide the preferred conditions are 1-35 bars and 190- 270‹ C. with methane present as a diluent, while for propylene oxide they are a ratio of 0À1-5 moles O 2 per mole propylene, total pressure of 1-100 bars, propylene partial pressure 0À3-50 bars and oxygen partial pressure 0À02-10 bars with CO 2 as diluent. Reference has been directed by the Comptroller to Specification 1,411,315. |
