Wacker Chemie Ag

Klaus Kaeppler

Gerhard Nagy

Konrad Mautner

Paul Fuchs

Gerhard Staiger

Alfred Popp

Andreas Bockholt

Norbert Ellinger

Ulrike Buettner

Elfriede Thumser

Helmut Enthammer

Javad Mohsseni

Christine Kaes

Peter Nuernberg

Reinhold Iretzberger

Christian Kaltenmarkner

Stephan Beutlhauser

Peter Nürnberg

Silicone resins are reproducibly prepared in a four step process in which alcohol recovered in a second step is recycled to the first step, and an aqueous phase recovered in the fourth step contains very little HCl, alcohol, or organopolysiloxane, and can be directed to waste treatment without any prior processing.

Method for producing organopolysiloxane resins

Cleaning industrial plant components to remove silane, metal halide, and organometallic halide contaminants and mixtures thereof, involves treating the plant components with a liquid nitrile or amine or mixture thereof or with a solution of a nitrile or amine or mixture thereof in an aprotic solvent.

Cleaning industrial plant components to remove metal halides

Cyclic siloxanes are separated from short chain hydroxyl-terminated siloxanes by contact with steam at at least 650 hPa absolute. The cyclic siloxanes and other components which are separated by use of steam can be recovered by phase separation, and preferably used in other processes.

Separating cyclic siloxanes from short-chain siloxanes having terminal hydroxyl groups

Mixtures containing high boiling and low boiling components, at least one component being dissociatable into ions, are separated effectively by heating by passing an alternating electrical current through the mixture. The process is particularly effective in the workup of crude alkylchlorosilanes from the direct synthesis.

Method for evaporating components of a liquid

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.

Process for the preparation of chloromethane using recycled hydrogen chloride

The invention relates to a method for processing mixtures which contain HCl, HO and siloxanes in the presence of packings comprising fluorinated vinyl polymers.

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Burghausen, Germany

Klaus Kaeppler