Basf Aktiengesellschaft

Thomas Papkalla

Matthias Eiermann

Karl Gerhard Baur

Ulrich Kanne

Klaus Ebel

Toni Dockner

Peter Stops

A process for preparing methanesulfonic acid by irradiating a mixture comprising acetic acid, sulfur dioxide and oxygen with light, wherein the reaction mixture is irradiated with an average cumulative irradiance in the range from 240 to 320 mm of from 0.05 to 50 mmol quanta/cm,h at the light entry area.

Preparation of methane sulfonic acid

A process for preparing alkyl 5-oxo-6-heptenoates of the formula I ##STR1## where X and Y are hydrogen or methyl, and R.sup.1 is C.sub.1 -C.sub.8 -alkyl, by

Preparation of alkyl 5-oxo-6-heptenoates, and novel intermediate for the

A process for the oxidation of ammonium ions and organic carbon in wastewaters containing ammonium ions and organic carbon by means of nitric acid at from 100.degree. to 350.degree. C., wherein the molar ratio between organic carbon and ammonium nitrogen is adjusted to a value in the range from 0.3:1 to 4:1 by addition of organic carbon or ammonium nitrogen.

Oxidation of ammonium ions and organic carbon in wastewaters

A process for breaking down aromatic nitro compounds in waste waters from plants for the production of nitrobenzene by treatment with nitric acid is carried out at from 180.degree. to 350.degree. C. and under a pressure of from 40 to 250 bar.

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Mannheim, Germany

Thomas Papkalla