Stamicarbon B.v.

Stamicargon B. V.

Franciscus T Van Den Brink

Marinus Alfenaar

Rudolf Van Hardeveld

Paul C Van Geem

Andreas M Thomas

The invention relates to a process for preparing cyclohexanol and/or cyclohexanone, in which cyclohexene in a feed stream containing cyclohexene, cyclohexane and benzene is hydrated into cyclohexanol and/or oxidized into cyclohexanone, the cyclohexanol and/or cyclohexanone formed is separated from the reaction mixture thus obtained and the remaining cyclohexane and benzene are recycled to a preconnected cyclohexene preparation section, part of the stream that is recycled to the cyclohexene preparation section being subjected to a dehydrogenation reaction and the remaining part to a hydrogenation reaction, and the reaction streams thus obtained being combined to form the feed stream to the hydration and/or oxidation step.

Process for the preparation of cyclohexanol and/or cyclohexanone

The invention relates to a process for the electrochemical oxidation of organic products at a lead-silver anode in acid medium, in which process the organic products used are alkyl-substituted heterocycles and in which process a lead-silver anode with 2-10% (wt) silver is used.

Process for the electrochemical oxidation of organic products

The invention relates to a process for the electrochemical oxidation of an alkylpyridine having the formula ##STR1## where R represents an alkyl group with 1-6 C atoms, and x is 1,2 or 3, in an acid medium at a lead-containing anode of an electrolytic cell with anode and cathode compartments separated by an ion-exchange membrane, this process being characterized in that as an ion-exchange membrane an anion-exchange membrane is used and as catholyte an aqueous solution of the same acid as used in the anolyte, which solution is dilute in respect of this anolyte, and subsequently the reaction product is recovered from the anolyte.

Process for the electrochemical oxidation of alkylpyridines

A process for the preparation of a hydroxylammonium slat and an oxime from said hydroxylammonium salt and an aldehyde or keton is disclosed in which an aqueous acid reaction medium is kept in circulation between a zone for the synthesis of the salt and a zone for the synthesis of the oxime and in which nitrate ions and/or nitrogen monoxide are continuously supplied as a reducible nitrogen source for the liquid kept in circulation, wherein the circulation liquid is subjected to an electrodialysis to remove the ammonium ions formed as a byproduct in the hydroxylammonium salt synthesis.

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Geldrop, Netherlands

Franciscus T Van Den Brink