Bayer Aktiengesellschaft

Bayer Corporation

Gerd Grah

Hermann Seifert

Helmut Judat

Daniel M Wasleski

David M Mayes

Artur Judat

The invention relates to process for the preparation of an O-alkyl, O-alkyl phosphorochloridothioate by 1) reacting A) a thiophosphoryl halide with B) an alcohol, in the presence of C) a tertiary amine acid acceptor and D) a solvent, and 2) reacting the resultant product with a second alcohol, different from the alcohol used in step 1). In the preferred embodiment, the intermediate product is not isolated before reaction with the second alcohol.

Process for preparing O-alkyl, O-alkylphosphorochloridothioates

A method is provided for controlling the flow of liquid through a column separated by vertically spaced plates into compartments to determine the height of liquid on a plate wherein the liquid is flowed through tubes from compartment to compartment and the rate of flow through the tubes is regulated by a throttle valve responsive to gas pressure below a plate or to the height of liquid in a compartment.

Method for regulating the flow of liquid through mass transfer columns

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Haan, Germany

Gerd Grah