Abstract: A process for preparing sodium and aluminum chloride electrochemically is described in which, in an electrolytic cell containing aluminum as an anode and sodium as a cathode which are separated from one another by a sodium ion-conducting solid electrolyte, a fused electrolyte essentially containing sodium tetrachloroaluminate is electrolyzed in the anode compartment, aluminum chloride formed in this process is evaporated from the electrolytic cell and sodium is removed from the cathode compartment.

Abstract: A process for preparing sodium and aluminum chloride electrochemically is described in which, in an electrolytic cell containing aluminum as an anode and sodium as a cathode which are separated from one another by a sodium ion-conducting solid electrolyte, a fused electrolyte essentially containing sodium tetrachloroaluminate is electrolyzed in the anode compartment, aluminum chloride formed in this process is evaporated from the electrolytic cell and sodium is removed from the cathode compartment.

Abstract: Anhydrous aluminum chloride is prepared by reacting .gamma.-alumina with carbon monoxide and chlorine and/or phosgene in a fluidized bed at from 400.degree. to 700.degree. C. The .gamma.-alumina used gives, with CuK.sub..alpha. radiation, an X-ray diffraction pattern whose intensity at the diffraction angle 2.sup..crclbar. =42.8.degree..+-.0.4.degree. divided by the intensity at the diffraction angle 2.sup..crclbar. =45.7.degree..+-.0.2.degree. is .ltoreq.0.38.

Abstract: A flange coupling for joining multi-layer apparatus sections or pipeline sections, in which corrosive and hot gases are handled, consists of an inner lining of glass which is resistant to thermal shock, or of quartz, which is surrounded by an outer metal jacket, the interspace between the outer jacket and the lining being packed with a heat-insulating material.In the region of the ends of the lining, refractory bricks which surround the lining, support it but do not touch it over the entire surface are provided between the lining and the outer jacket; the lining, at one or both ends, does not terminate flush with the refractory bricks, and the refractory bricks surrounding the lining terminate at least substantially flush with the surrounding outer jacket, the two ends of which each merge into a flange coupling.

Abstract: De-dusting of gases is carried out in an apparatus containing a granular-bed filter, the pourable granular filter medium flowing downward through the bed. The apparatus comprises a vessel of rectangular cross-section with a vertical side wall (4) extending from the top to the bottom. A partition (5), arranged parallel to the side wall (4), extends from the upper end of the vessel into the interior of the vessel. The remaining three side walls of the vessel extend - at least starting from a level corresponding to the lower end of the partition (5), taperingly downward to the outlet (9). The partition (5) is supported by the two walls adjacent to the vertical wall and forms, together with these and with the talus (7) of the filter medium, which arises at the lower end of the partition, a chamber (3) into which the inlet (2) for the gas to be purified opens.