Abstract: An installation includes a guide arrangement, guiding a material web, a conveying speed detection device, detecting a conveying speed of the conveyed material web, and a winding arrangement arranged downstream from the conveying speed detection device. The winding arrangement includes a rotatably mounted winding device, winding up the material web. The winding device is non-circular in cross section at least in a material web winding-up region, folding the material web. The winding arrangement has a rotary drive, in driving connection with the winding device, driving the winding device in rotation. An actuating device is at least temporarily in signal communication with the conveying speed detection device for receiving conveying speed signals therefrom, characterizing the respective conveying speed of the material web, and is at least temporarily in signal communication with the rotary drive for actuating the latter upon folding the material web in dependence on the conveying speed signals.

Abstract: Use of a composition comprising A) from 55 to 90% by weight of aluminum oxide, B) from 5 to 35% by weight of a sodium compound which at a pH of 7 at 20° C. has a solubility in water of ?300 g/l and can be converted by thermal means virtually exclusively into sodium oxide as only solid, C) from 0 to 15% by weight of a magnesium compound and/or a lithium compound selected from the group consisting of: magnesium oxide, magnesium carbonate, magnesium nitrate, lithium oxide, lithium carbonate, lithium nitrate and D) from 0 to 30% by weight of zirconium dioxide for producing a shaped ceramic body by extrusion.

Abstract: The invention relates to a device for storing heat, comprising a heat storage medium which absorbs heat in order to store heat and releases heat in order to use the stored heat, and a container for holding the heat storage medium, the container being closed by a gastight cover, and the device comprising volume compensation means in order to compensate for a volume increase of the heat storage medium (3) due to a temperature rise and a volume decrease due to a temperature reduction.

Abstract: The invention relates to a method of storing, transporting and supplying electrochemical energy, with storage and supply being physically separated.

Abstract: The invention relates to an electrode unit for an electrochemical device, comprising a solid electrolyte (3) and a porous electrode (7), the solid electrolyte (3) dividing a compartment for cathode material and a compartment for anode material and the porous electrode (7) being extensively connected to the solid electrolyte (3), with a displacer (23) being accommodated in the anode material compartment, where the displacer (23) is manufactured from a stainless steel or from graphite foil and bears resiliently against the internal geometry of the solid electrolyte (3) in such a way that the displacer (23) does not contact the solid electrolyte over its full area, or with the displacer comprising an outer shell (62) of stainless steel or graphite, and a core (64) of a nonferrous metal, the nonferrous metal being thermoplastically deformable at a temperature which is lower than the temperature at which the stainless steel is thermoplastically deformable, and where for production the shell (62) of stainless steel

Abstract: Use of a composition comprising A) from 55 to 90% by weight of aluminum oxide, B) from 5 to 35% by weight of a sodium compound which at a pH of 7 at 20° C. has a solubility in water of ?300 g/l and can be converted by thermal means virtually exclusively into sodium oxide as only solid, C) from 0 to 15% by weight of a magnesium compound and/or a lithium compound selected from the group consisting of: magnesium oxide, magnesium carbonate, magnesium nitrate, lithium oxide, lithium carbonate, lithium nitrate and D) from 0 to 30% by weight of zirconium dioxide for producing a shaped ceramic body by extrusion.

Abstract: Process for removing metal compounds or metalloid compounds M present in the gas phase from a gas G comprising these, wherein the gas G comprising the volatile metal compound or metalloid compound M is brought into contact with a solid donor D and the resulting reaction product is separated off.

Abstract: The invention relates to a process for the electrochemical separation of hydrogen from a hydrogen-comprising reaction mixture R by means of a gastight membrane-electrode assembly comprising at least one selectively proton-conducting membrane and at least one electrode catalyst on each side of the membrane, where at least part of the hydrogen present in the reaction mixture R is oxidized to protons over the anode catalyst on the retentate side of the membrane and the protons are, after passing through the membrane to the permeate side, I reduced to hydrogen over the cathode catalyst and/or II reacted with oxygen over the cathode catalyst to form water, with the oxygen originating from an oxygen-comprising stream O which is brought into contact with the permeate side of the membrane, and also a reactor equipped with at least one membrane-electrode assembly.

Abstract: The invention relates to an improved industrial apparatus for the large-scale storage of energy and a process for storing and transporting electric energy by means of this apparatus.

Abstract: The invention relates to an electrode unit for an electrochemical device, comprising a solid electrolyte (3) and a porous electrode (7), the solid electrolyte (3) dividing a compartment for cathode material and a compartment for anode material and the porous electrode (7) being extensively connected to the solid electrolyte (3), with a displacer (23) being accommodated in the anode material compartment, where the displacer (23) is manufactured from a stainless steel or from graphite foil and bears resiliently against the internal geometry of the solid electrolyte (3) in such a way that the displacer (23) does not contact the solid electrolyte over its full area, or with the displacer comprising an outer shell (62) of stainless steel or graphite, and a core (64) of a nonferrous metal, the nonferrous metal being thermoplastically deformable at a temperature which is lower than the temperature at which the stainless steel is thermoplastically deformable, and where for production the shell (62) of stainless steel

Abstract: Process for preparing an alkali metal from a salt of the alkali metal which is soluble in a solvent, including a first electrolysis, a concentration, and a second electrolysis. The first electrolysis produces a product mixture. This product mixture is then concentrated to give a largely solvent-free alkali metal (poly)sulfide melt. A second electrolysis at a temperature above the melting point of the alkali metal is then performed in a second electrolysis cell comprising an anode space and a cathode space, separated by a solid electrolyte which conducts alkali metal cations. The alkali metal (poly)sulfide melt from the concentration step is fed to the anode space. Sulfur is removed from the anode space and liquid alkali metal is removed from the cathode space.

Abstract: The invention relates to an electrode unit for an electrochemical device for storing electrical energy, comprising a solid electrolyte (3) and a porous electrode (7), the solid electrolyte (3) dividing a compartment for cathode material and a compartment for anode material and the porous electrode (7) being extensively connected to the solid electrolyte (3) and the cathode material flowing along the porous electrode (7) during discharging. On the side remote from the solid electrolyte (3), the porous electrode (7) is covered towards the compartment for the cathode material with a segment wall (9), the segment wall (9) comprising inlet openings (15) in the direction of flow of the cathode material, through which the cathode material penetrates into the porous electrode (7), reacts chemically with the anode material in the porous electrode (7) and emerges back out of the porous electrode (7) through outlet openings (17) downstream in the direction of flow.

Abstract: A method is provide for preparing potassium metal which comprises embedding a polycrystalline alkali metal ??-Al2O3 molding in an oxidic powder containing potassium and aluminum of a molar K2O:Al2O3 ratio within the range of 1:(x?1) to 1:(x+1), the weight of oxidic powder amounting to at least two times the weight of the molding; heating the embedded molding at a rate of at least 100° C. per hour to at least 1100° C.; and further heating to at least 1300° C., this temperature being maintained for at least one hour prior to cooling.

Abstract: A process for preparing aluminum oxide with a low calcium content, in which (1) crude alpha- and/or gamma-aluminum oxide with a total calcium content in the range from 50 to 2000 ppm, based on the crude alpha- and/or gamma-aluminum oxide, is mixed with an aqueous solution or suspension comprising the compounds selected from the group of inorganic acid, organic acid and complexing agent, (2) the mixture from step (1) is admixed with a flocculating aid, (3) in the mixture of step (2), the solids are separated from the liquid, (4) the solids separated are mixed with water in the presence or in the absence of a flocculating aid, (5) in the mixture of step (4), the solids are separated from the liquid, (6) optionally, steps (4) and (5) are repeated once or more than once, (7) optionally, the solids separated optionally after addition of further compounds, are dried.

Abstract: The invention relates to a process for removing small amounts of water and possible further constituents from alkali metal amalgam, wherein the alkali metal amalgam is brought into contact with an element which is insoluble in mercury and catalyzes the reaction of water with the alkali metal amalgam and the possible further constituents to form hydroxides and hydrogen.

Abstract: A process for preparing magnesium compounds by precipitation, in which an aqueous solution or suspension of a magnesium compound is mixed with a precipitant and the corresponding magnesium compound is precipitated wherein the aqueous solution or suspension of a magnesium compound is obtained by reaction of an organomagnesium compound with an aldehyde or a ketone or another electrophile and subsequent aqueous workup of the reaction mixture at a pH of at most 10 or from a magnesium salt with a maximum calcium content and/or potassium content of 200 ppm, based on the magnesium salt used.

Abstract: A process for preparing aluminum oxide with a low calcium content, in which (1) crude alpha- and/or gamma-aluminum oxide with a total calcium content in the range from 50 to 2000 ppm, based on the crude alpha- and/or gamma-aluminum oxide, is mixed with an aqueous solution or suspension comprising the compounds selected from the group of inorganic acid, organic acid and complexing agent, (2) the mixture from step (1) is admixed with a flocculating aid, (3) in the mixture of step (2), the solids are separated from the liquid, (4) the solids separated are mixed with water in the presence or in the absence of a flocculating aid, (5) in the mixture of step (4), the solids are separated from the liquid, (6) optionally, steps (4) and (5) are repeated once or more than once, (7) optionally, the solids separated optionally after addition of further compounds, are dried.

Abstract: A method is provide for preparing potassium metal which comprises embedding a polycrystalline alkali metal ??-Al2O3 moulding in an oxidic powder containing potassium and aluminium of a molar K2O:Al2O3 ratio within the range of 1:(x?1) to 1:(x+1), the weight of oxidic powder amounting to at least two times the weight of the moulding; heating the embedded moulding at a rate of at least 100° C. per hour to at least 1100° C.; and further heating to at least 1300° C., this temperature being maintained for at least one hour prior to cooling.

Abstract: The invention relates to a device for receiving hot, corrosively acting liquids (7), comprising a space enclosed by a wall (21) for receiving the liquid (7), the space having an inner insulation (19). The invention also relates to the use of the device for storing corrosively acting liquids for storing a heat storage medium comprising sulfur.

Abstract: A solid polycrystalline potassium ion conductor having a ??-Al2O3 structure, its production, and the preparation of potassium metal using this potassium ion conductor.