Abstract: The present invention relates to a device, to the use thereof, and to a method for the substantially energy-independent continuous production of chlorosilanes, particularly for the production of trichlorosilane as an intermediate product for yielding high-purity silicon.

Abstract: The invention relates to a method for the gradual temperature control of chemical substances with defined entry and exit temperatures in a heater, said substances being maintained in a specific defined temperature range as they are conducted through the heater, and to a device for carrying out said method. The aim of the invention is to provide a suitable method and device for carrying out said method, said device permitting an economically advantageous, reliable and environmentally friendly operation, in particular during the start-up process for the device. This aim is achieved by the features according to the invention mentioned in claims 1;11 and 19; 22.

Abstract: Hydrophobic, pyrogenically produced oxides having a ratio of dimethylsilyl groups to monomethylsilyl groups of 100:0 to 50:50 are prepared by using siloxanes or methylsiloxane mixtures D3 to D9 as hydrophobing agent.

Abstract: An electrolysis cell with a fixed-bed electrode and its use for the purification of waste gases. The electrolysis cell includes a fixed-bed electrode, a counterelectrode which is separated from it and designed as a gas diffusion electrode, devices for the supply and flow-off of an electrolyte as well as for the inlet and outlet of the gas to be purified and a space associated with the counterelectrode with devices for the supply and the removal of a gas. In order to purify gas the fixed-bed electrode is operated as a trickle bed and the gas to be purified flows in cocurrent or countercurrent flow to the electrolyte. In reductive purification hydrogen is supplied to the gas diffusion electrode and in oxidative purification oxygen is used.