Dynamit Nobel Aktiengesellschaft

Dynamit Noble Aktiengesellschaft

Walter Josten

Hans-Joachim Vahlensieck

Heinz Nestler

Friedhelm Schnippering

Werner Dittrich

Han-Joachim Kotzsch

A compound of tetravalent vanadium of the general formula ##STR1## wherein M represents a metal of the fourth group of the Periodic Table of the Elements and R represents and alkyl, cycloalkyl or aryl moiety of 1 to 20 carbon atoms and a process for its preparation. Also disclosed is the use of such vanadium compound as a catalyst for homopolymerization, copolymerization or terpolymerization of various monomers including olefins and vinyl monomers.

Tetravalent vanadium compounds which are soluble in organic solvents

A ceramic molding composition comprising an alcoholate of aluminum or a metal of the fourth sub-group of the Periodic System, a refractory metal oxide and a polyvalent alcohol, an improvement in the formation of a ceramic product wherein a ceramic molding composition is shaped and hardened, which improvement resides in employing the above defined ceramic molding composition.

Process for the manufacture of refractory ceramic products

A ceramic molding composition comprising an alcoholate of aluminum or a metal of the fourth sub-group of the Periodic System, a refractory metal oxide and an agent selected from the group consisting of diketones of the formula ##STR1## wherein R.sub.1 and R.sub.2 are each independently an aliphatic radical of between C.sub.1 and C.sub.18 carbon atoms or an aromatic radical from C.sub.6 to C.sub.18 carbon atoms, a hydroxycarboxylic acid compound of the formula ##STR2## wherein R.sub.3 is an aliphatic radical of C.sub.1 and C.sub.18 or an aromatic radical from C.sub.6 to C.sub.18, and R.sub.4 is hydrogen or an alkyl radical of C.sub.1 to C.sub.4, and a polyvalent alcohol, an improvement in the formation of a ceramic product wherein a ceramic molding composition is shaped and hardened, which improvement resides in employing the above defined ceramic molding composition.

An improvement in a process for preparing silicon tetrachloride or silicon trichloride wherein elemental silicon is contacted with hydrogen chloride in a fluidized bed, the improvement residing in carrying out the process in the presence of an iron compound, which iron compound is present in an amount such that when calculated as iron, the iron content is 10 to 43 weight percent based on the weight of the total solids in the fluidized bed, at a temperature in the range of 260.degree.-600.degree. C, preferably in the absence of an inert gas.

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Rheinfelden, Germany

Walter Josten