Method for producing alkyl chlorosilanes from the residues of the direct synthesis of alkyl chlorosilanes

A process for producing alkylchlorosilanes from a reaction mixture comprising residues from the direct synthesis of alkylchlorosilanes which comprise liquids with a boiling point of at least 70° C. at 1013 hPa and further constituents comprising metals and metal compounds, comprising heating the reaction mixture in a pressurized reactor to a reaction temperature of from 200 to 500° C. via passage of alternating electrical current through the liquid reaction mixture.