Abstract: A process for the preparation of a polyolefin wax by polymerization or copolymerization of olefins or diolefins in suspension and in the presence of a catalyst. The process utilizes a metallocene and a cocatalyst, wherein the metallocene is a compound of the formula I ##STR1## in which M.sup.1 is a metal of group IVb, Vb or VIb of the Periodic Table of Elements, R.sup.1 and R.sup.2 are identical or different and are a hydrogen atom, a C.sub.1 -C.sub.10 -alkyl group, a C.sub.1 -C.sub.10 -alkoxy group, a C.sub.6 -C.sub.10 -aryl group, a C.sub.6 -C.sub.10 -aryloxy group, a C.sub.2 -C.sub.10 -alkenyl group, a C.sub.7 -C.sub.40 -arylalkyl group, a C.sub.7 -C.sub.40 -alkylaryl group, a C.sub.8 -C.sub.40 -arylalkenyl group or a halogen atom and R.sup.3 and R.sup.4 are identical or different and are a mononuclear or polynuclear hydrocarbon radical which may form a sandwich structure with the central atom M.sup.

Abstract: A process for the preparation of a polyolefin wax by polymerization or co-polymerization of olefines or diolefins at a temperature of -40.degree. to 100.degree. C. at a pressure of 0.5 to 120 bar, in suspension and in the presence of a metallocene catalyst and a co-catalyst, thereby producing wax products in solid form which may be easily separated from the suspending agent and the catalyst need not be separated off.

Abstract: A process is described for the production of pure tetrafluoroethylene from a gas formed in the pyrolysis of a fluorocarbon compound having 1 to 4 carbon atoms, which can contain a hydrogen atom and a chlorine atom. The pyrolysis gas, after hydrogen chloride or hydrogen fluoride and also if necessary steam have been separated off, is condensed under pressure and distilled in a plurality of columns, in the first column the low boilers being distilled off, preferably with a reflux ratio of 6 to 15 kg per kg of tetrafluoroethylene produced, and in the second column tetrafluoroethylene, preferably with a reflux ratio of 3 to 5 kg per kg of tetrafluoroethylene produced. Per kg of tetrafluoroethylene produced, from 0.6 to 2 kg of difluoromonochloromethane are fed into the second column as a distillation aid. The novel process makes it possible to produce pure tetrafluoroethylene at comparatively reduced energy and apparatus costs.

Abstract: The invention provides a process for the continuous manufacture of trioxan, optionally together with cyclic formals, from aqueous formaldehyde solutions in a circulation reactor with evaporator, the vapor/liquid mixture leaving the evaporator is fed in below the liquid level of the reaction mixture. The process of the invention allows to attain especially high space/time yields.

Abstract: Process for preparing acetic acid by oxidation of acetaldehyde with oxygen or oxygen containing gases in the presence of a catalyst based on manganese acetate, wherein the crude acetic acid and the gases formed, still containing acetaldehyde, are submitted to an after-oxidation, the low-boiling substances are distilled off and the residue is reused as catalyst.