Abstract: A method of preparing sulphur trioxide by the oxidation of sulphur dioxide contained in a reaction mixture in a stationary catalyst bed wherein the direction of the movement of the reaction mixture flow along the catalyst bed is reversed periodically each 10-200 minutes, or the temperature of said reaction mixture is changed in front of the catalyst bed from a temperature of 20.degree.-200.degree. C. to a temperature of 350.degree.-600.degree. C. each 10-200 minutes.

Abstract: The method of preparing granulated activated alumina consists in that alumina trihydrate is decomposed by bringing it in contact with a bed of a solid heat carrier having the temperature of 350.degree. to 600.degree. C., the contact time being from 0.05 to 0.5 second, to obtain a product of decomposition in the form of amorphous aluminium hydroxide. Said decomposition product is mixed with water into a suspension having the concentration of 100-500 g/liter, calculating with reference to aluminium oxide, and hydrated at a temperature of 20.degree.-100.degree. C. and the pH of 5 to 12 for 0.5 to 10 hours. The hydrated decomposition product is then treated with an acid, that can form water-soluble basic salts of aluminium, at a temperature of 20.degree. to 150.degree. C., granulated, dried at a temperature of 20.degree. to 150.degree. C., and calcined at a temperature of 400.degree. to 600.degree. C.

Abstract: The invention relates to a method of producing ethylene oxide, consisting in that ethylene is oxidized with oxygen or air in a fluidized bed of a silver catalyst containing cadmium carbonate and/or cadmium oxide and also fused alumina having a particle size of between 2 microns and 0.5 mm, the components of the catalyst being taken in the following proportion (wt.%): silver, between 9.5 and 76; cadmium carbonate and/or cadmium oxide, between 0.5 and 4 (in terms of metallic cadmium); fused alumina, between 90 and 20. The oxidation of ethylene takes place at a partial pressure of ethylene between 0.6 and 15 atm, a partial pressure of oxygen between 0.1 and 2 atm, at an aggregate pressure of 2 to 20 atm and a temperature between 200.degree. and 300.degree. C in a reactor with a packing. The fused alumina may be used as a filler or support.