Deutsche Gold- Und Silber-Scheideanstalt Vormals Roessler

Ferdinand Theissen

Theodor Lussling

Edgar Koberstein

Gerd Schreyer

Wolfgang Weigert

Klaus-Peter Muller

Klaus Muller

Methionine and potassium are recovered from the recycling solution of the potassium carbonate-methionine process by concentrating the mother liquor after the methionine precipitation and with cooling carbonating the mother liquor.

Process for the recovery of methionine and potassium bicarbonate

Malononitrile is prepared by the short time high temperature reaction of gaseous acetonitrile and cyanogen chloride in the molar ratio of acetonitrile to cyanogen halide of above 1 characterized in that the well mixed reaction components are reacted at an average temperature below 800.degree. C. and the reaction is quenched to condense acetonitrile and malononitrile by introducing a cooling medium into the reaction system.

Process for the production of malononitrile

3-Methylmercaptopropionaldehyde is made from acrolein and methyl mercaptan using hexamethylene tetramine as the catalyst.

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Munich, Georgia

Ferdinand Theissen