Abstract: The present invention relates to a continuous process for producing an alkylene oxide by direct oxidation of an alkene with oxygen by reacting a mixture comprising alkene and oxygen in the presence of a silver-comprising catalyst for a run time ?t(i), wherein during the oxidation, the catalyst is additionally contacted at least once with a further mixture comprising ethanol for a run time ?t(ii), wherein the run time ?t(i)>?t(ii).

Abstract: The invention discloses a method for producing acetaldehyde and/or acetic acid, according to which method a gaseous flow, containing molecular oxygen, ethanol and at least one impurity selected from sulphur compounds, is brought into contact at a high temperature with a sulphur-resistant oxidation catalyst. The ethanol is preferably obtained from a biomass. Said sulphur-resistant oxidation catalyst comprises, for example, vanadium oxide and at least one oxide of zirconium, titanium and aluminium. In one embodiment, the gaseous flow is converted, on the sulphur-resistant oxidation catalyst, into a first oxidation mixture, acetaldehyde being the predominant oxidation product, and said first oxidation mixture is converted, on another oxidation catalyst, into a second oxidation mixture, acetic acid being the predominant oxidation product. Said other oxidation catalyst comprises, for example, a multi-metal oxide containing at least molybdenum and vanadium.

Abstract: The present invention relates to a continuous process for producing an alkylene oxide by direct oxidation of an alkene with oxygen by reacting a mixture comprising alkene and oxygen in the presence of a silver-comprising catalyst for a run time ?t(i), wherein during the oxidation, the catalyst is additionally contacted at least once with a further mixture comprising ethanol for a run time ?t(ii), wherein the run time ?t(i)>?t(ii).

Abstract: Processes for preparing ethylene oxide, the process comprising: (a) providing a catalyst-comprising microchannel reactor; (b) feeding (i) an ethylene-comprising stream and (ii) a stream comprising oxygen, an oxygen source or both, into the microchannel reactor; and (c) continuously feeding one or more components selected from the group consisting of alkyl halides, nitrogen-comprising compounds, and mixtures thereof into the microchannel reactor in a concentration of from 0.3 to 50 ppm by volume, each based on the total volume flow of all streams introduced into the reactor.