Abstract: The invention relates to a process for the preparation of .alpha.-.beta. unsaturated alcohols of the formula ##STR1## where R.sub.1, R.sub.2 and R.sub.3, which may be equal or different, represent phenyl, optionally substituted with one or more alkyl and/or alkoxy groups, the total number of C atoms of these substituents being at most 5, or hydrogen or an alkyl group with 1-10 C atoms, with at least one of the groups R.sub.1, R.sub.2 and R.sub.3 representing the optionally substituted phenyl group, by hydrogenation in the liquid phase of the aldehyde corresponding with the desired alcohol, this being effected in the presence of a platinum-containing catalyst and of an alkali metal hydroxide and/or an alkali metal alkoxide as promotor, wherein platinum-on-graphite is used as catalyst.

Abstract: The process for (co)polymerization comprises polymerizing ethylene and optionally minor amounts of 1-alkenes and/or dienes at a temperature greater than 180.degree. C. in the presence of a catalyst system prepared by combining at least two components, A and B, which components comprise:A: one or more titanium compounds and one or more vanadium compounds, mixed with one or more organoaluminum compounds in such an amount that the atomic ratio of aluminum to the sum of titanium and vanadium is at least 3,B: one or more organoaluminum compounds,wherein one or both components A and b contain a chloride, and wherein the two components are fed, separately or in combination, direct to the reaction vessel in such an amount that the atomic ratio of the chlorine from components A and/or B to the sum of titanium and vanadium of component A is at least 6.

Abstract: Method for preparing a setting foam material containing plastic material granules, which plastic material granules are prepared from beads of plastic material. After preparing a slurry of base material it is mixed with the plastic material granules. This motar is immediately pumped after which the foam is introduced.

Abstract: Alkylpyrimidines are dealkylated to the corresponding pyrimidines by contacting with an oxidation catalyst containing one or more oxides of at least one of the elements of the group consisting of Bi, Mo and V in the presence of water and oxygen in the gas phase at a temperature of 300.degree.-450.degree. C.

Abstract: The invention relates to a process for purifying ethylene-alkene-diene rubbers by extraction with an extractant chosen from substances with a critical temperature below 435.degree. K. at a temperature above the critical temperature of the extractant and a pressure above the critical pressure of the extractant.

Abstract: A multiplexer device includes a plurality of optical fibers. One of the end faces of each of the fibers is arranged in a common plane. The fibers include a first optical fiber for conducting several light signals of different wavelengths and at least two second optical fibers, each of which conduct a light signal in a single waveband. The device also includes a wavelength-selective element (33) and a lens system (51, 53) which is arranged between the wavelength-selective element and the common plane. In order to minimize the number of components of the device and to facilitate adjustment during assembly, the lens system is formed by a plane parallel, transparent plate (51) which bears against the end faces (9, 11) of the optical fibres as well as by a lens (53) having the shape of a flattened sphere whose plane surface rests on the plate.