Wacker-chemie Gmbh

Anton Schinabeck

Konrad Mautner

Bernd Pachaly

Wilfried Kalchauer

Herbert Straussberger

Norbert Zeller

Rudolf Riedle

Tassilo Lindner

Ulrich Goetze

Georg Engelsberger

Berthold Haefner

The invention relates to a process for cleavage of chlorohydrocarbons which are present as an impurity in organochlorosilanes, in which the chlorohydrocarbons are brought into contact with steel surfaces which comprise nickel as an alloying constituent, and are cleaved into olefins and hydrogen chloride.

Process for the removal of chlorohydrocarbons from organochlorosilanes

Alkylchlorosilanes are prepared continuously from the residue of direct synthesis of alkylchlorosilanes containing liquid constituents with a boiling point of at least 70.degree. C. at 1013 hPa and solid constituents, by heating the residue with hydrogen chloride at temperatures of from 300.degree. C. to 800.degree. C. in a tubular reactor with internals which can be rotated.

Process for preparing alkylchlorosilanes from the residues of direct

In the process of the present invention, disilanes are reacted with hydrogen chloride in the presence of a catalyst comprising

Process for preparing hydrogen-containing methylchlorosilanes

In the process for the removal of olefins from the silanes or silane mixtures obtained during methylchlorosilane synthesis, the olefins are reacted with hydrogen in the presence of hydrogenation catalysts.

Process for the removal of olefins from silanes

A process for separating methylchlorosilanes from high boiling residues from the methylchlorosilane synthesis, in which cleavable methylchlorodisilanes which are present in the residues and which have at least two chlorine atoms attached to one silicon atom are cleaved with hydrogen chloride in the presence of a catalyst which remains in the reaction mixture, which comprises cleaving the methylchlorodisilanes in the presence of by-products which are more volatile than the cleavable methylchlorodisilanes in the high boiling residues from the methylchlorosilane synthesis which have a boiling point of at least 70.degree. C. under normal conditions and continuously removing the more volatile by-products from the reaction mixture along with the methylchlorosilanes and the noncleavable methylchlorodisilanes.

Separation of methylchlorosilanes from high boiling residues of

A process for separating alkenes from a methylchlorosilane mixture by adding at least a stoichiometric amount of hydrogen chloride necessary for saturating the alkenes in the methylchlorosilane mixture and thereafter removing resulting chloroalkanes by distillation.

Process for separating off alkenes during methylchlorosilane distillation

A continuous process for preparing silanes and siloxanes having SiOC groups which comprises (a) introducing in a liquid phase a chlorosilane and a hydroxyl-containing aliphatic compound in parallel flow into a first stage of a first reactor in an amount such that from 0.5 to 0.9 gram-mole of hydroxyl group is present per gram-atom of Si-bonded chlorine; (b) removing the liquid reaction mixture from the first reactor; (c) introducing the reaction mixture at the head of a column used as the second reactor which is maintained at an elevated temperature; (d) adding a hydroxyl-containing aliphatic compound as a gas at the lower end of the column or at a point between the lower end and the upper end of the lower one-third of the column, in an amount at least sufficient to completely react with the Si-bonded chlorine present in the reaction mixture obtained from the first stage and (e) removing the silane containing SiOC groups or polysiloxane containing SiOC groups from the column at a point below the point of addition of the hydroxyl-containing aliphatic compound.

Growing community of inventors

Burghausen, Germany

Anton Schinabeck