Bayer Aktiengesellschaft

Heinz Jorg Rosenbaum

Reinhard Thiel

Heinz-Jurgen Alpers

Karl-Heinz Dietz

Karl Heinz Heller

Hans Kerres

Siegfried Steiner

A process has been developed for the oxidation of organic substances, dissolved or dispersed in an aqueous system, with a gas containing molecular oxygen at elevated temperature and under elevated pressure chiefly to carbon dioxide and water, with subsequent phase separation of the reaction mixture into a gaseous phase substantially containing inert gas, carbon dioxide, steam and organic constituents and a liquid phase substantially containing water, characterized in that the pressure is adjusted, at the given temperature, so that by evaporation of water from the aqueous system, more steam than the exothermicity of the oxidation reaction gives rise to, goes into the gaseous phase, which is fed to a heat exchanger in which the amount of heat required to maintain the oxidation temperature is completely or partially transferred to a mixture of water and a gas containing molecular oxygen, which mixture flows in on the other side of the heat exchanger and is subsequently fed to the reactor. A particular advantage of the process of the invention is that, in addition to the oxidation of organic substances, it is possible to feed inorganic constituents, after the oxidative degradation of the organic substances, to a re-use or recovery process.

Process for wet oxidation of organic substances

An improvement in the process for the preparation of formaldehyde by oxidative dehydrogenation of methanol with air in the presence of a silver catalyst at an elevated temperature wherein into the reactor in which the methanol is charged there is passed a stream of gas containing a halogen or halogen compound.

Process for the preparation of formaldehyde

Hydrocarbons containing 4 to 20 carbon atoms are oxidized by a process which includes the following steps:

Process for oxidizing hydrocarbons

Hydrocarbons containing from 4 to 20 carbon atoms are oxidized with a gas containing molecular oxygen in the presence of a catalyst and/or auxiliary agents. The resulting reaction mixture is saponified with an aqueous alkaline solution and the resulting alkaline solution containing organic impurities is subjected to liquid phase oxidation with a gas containing molecular oxygen in at least a stoichiometric quantity sufficient for completely burning the organic ingredients, the oxidation taking place in a reaction zone heated to at least 200.degree.C under a pressure sufficient to keep at least some of the water in the liquid phase. The alkali carbonate/bicarbonate solution formed is recycled to the hydrolysis stage.

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Krefeld, Germany

Heinz Jorg Rosenbaum