Bayer Aktiengesellschaft

Hans-Georg Adams

Johannes Kaulen

Gert Jabs

Ottfried Schlak

Jan-Gerd Hansel

Hans-Günter Fröhlen

Process for preparing dimethyl propanephosphonate, characterized in that dimethyl phosphite is reacted with propene in the presence of a free-radical former at a reaction temperature of 60 to 95&#xb0; C., the half life of the free-radical former being 0.1 to 20 min at the reaction temperature.

Process for preparing dimethyl propanephosphonate

Process for extracting aqueous ketazine solutions which is carried out using an aqueous ketazine solution having a salt content of 5 to 27% by weight and an ammonia content of 0 to 28% by weight to extract at temperatures of 50 to 120&deg; C., which is characterized in that the ketazine solution to be extracted has a molar excess of 50 to 200% of ketone based on the ketazine to be extracted, and that an aliphatic hydrocarbon extractant is used which has a boiling point of 150 to 300&deg; C. at atmospheric pressure.

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Leverkusen, Germany

Hans-Georg Adams