| 摘要 |
1351299 Preparation of ethylene oxide CHEMISCHE WERKE HULS AG 19 April 1971 [14 April 1970] 26738/71 Heading C2C [Also in Division B1] Ethylene oxide is prepared by contacting ethylene with molecular oxygen in the presence of silver-containing catalyst which has been pre. pared by a process which comprises (i) treating porous support material having a porosity of above 50% and a pore diameter preferably of from 50 to 2000 microns with a suspension of silver oxide in an aqueous solution of a watersoluble silver salt of an organic acid, which silver salt is capable of reducing silver oxide to elemental silver at a temperature of from 160‹ to 230‹ C., and (ii) heating the treated support material at a temperature of from 160‹ to 230‹ C. to convert the silver oxide to elemental silver. The suspension, from 35 to 65 atom per cent of the silver content of which is in the form of silver oxide, may have been prepared by treating silver oxide with a 40 to 80 weight per cent aqueous solution of the organic acid, optionally followed by addition of further silver oxide. The steps (i) and (ii) may be repeated at least once; is steps (i) and (ii) are repeated at least twice, the suspension may contain silver oxide alone (i.e. no silver salt of an organic acid) from the third cycle onwards. As exemplified, ethylene oxide is prepared by contacting a gas mixture containing ethylene, oxygen, nitrogen and carbondioxide with catalyst which contains, as support material, silica/alpha-alumina and in the preparation of which lactic acid has been used as the organic acid. |
