Wacker Chemie Ag

Gerhard Nagy

Klaus Kaeppler

Reinhold Iretzberger

Klaus Käppler

Sulfuric acid contaminated with byproducts of chloromethane scrubbing is regenerated for reuse in the scrubbing process by diluting with water to not lower than about a 55 weight percent concentration, heating the diluted acid to boiling at not more than about 135&#xb0; C., concentrating the acid to a concentration of minimally 80 weight percent at a temperature of at least 170&#xb0; C., and reacting the concentrated acid with an oxidizing agent.

Process for the regeneration of sulfuric acid

The invention relates to a process for the preparation of chloromethane from methanol and hydrogen chloride contaminated with Si compounds, the Si compounds being methylchlorosilanes, methoxymethylsilanes and hydrolysis and condensation products thereof, in which some of the Si compounds are removed by condensation from the chloromethane formed and remaining Si compounds are washed out with methanol, the methanol thus obtained and containing Si compounds being used for the further preparation of chloromethane with hydrogen chloride.

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Handenberg, Austria

Gerhard Nagy