Abstract: A device for operating an electronic circuit at a high-voltage potential includes a diode array installed in a high-voltage line, wherein a current is configured to flow over the high-voltage line through the diode array. A voltage drop over the diode array is applied to the electronic circuit, which is configured to provide information ascertained on the high-voltage line. An evaluation unit connected to the electronic circuit via a galvanically separated transmission device receives the information from the electronic circuit.

Abstract: A process for the preparation of alkyleneimines by subjecting sulfuric acid monoesters of aminoalkanols to an at least two-stage reaction with aqueous bases at a temperature of at least 110° C. under pressure, relieving the pressure of the reaction mixture and distilling off the alkyleneimines from the reaction mixture after each reaction stage, wherein the conversion in the first stage is from 40 to 90% and that in the second stage is from more than 90% to 99.99%.

Abstract: A process for the preparation of alkyleneimines by subjecting sulfuric acid monoesters of aminoalkanols to an at least two-stage reaction with aqueous bases at a temperature of at least 110° C. under pressure, relieving the pressure of the reaction mixture and distilling off the alkyleneimines from the reaction mixture after each reaction stage, wherein the conversion in the first stage is from 40 to 90% and that in the second stage is from more than 90% to 99.99%.

Abstract: A method and apparatus are disclosed for recovering pure naphthalene from hot crude coke oven gas. The hot crude coke oven gas is directly cooled by means of sprinkling water directly thereon, and the naphthalene is recovered by subsequent filtering out of tar and other impurities, followed by cooling to obtain crystalline pure naphthalene. More specifically, after direct cooling of the hot crude coke oven gas, the gas is then guided through an electrofilter to be subsequently cooled in such a manner that the naphthalene contained in the crude coke oven gas is separated from the gaseous phase and is obtained in the form of pure naphthalene crystals without any required additional treatment.

Abstract: A coke-oven door has an annular periphery normally juxtaposed with an annular door frame. A seal assembly for the door has at least two flexible, relatively displaceable, metallic, and annular membranes each having an annular inner periphery and an annular outer periphery and a U-section channel fixed to the outer periphery of only one of the membranes, open toward the door, and having annular inner and outer edges. The other membrane bears on the one membrane and therethrough on the channel. A mount secures the inner peripheries of the membranes to the periphery of the door. A spring urges the edges of the channel with a spring force against the door frame.

Abstract: A process and system for separation of foreground information from background information in a document is described. In an initial stage, at least two images of a document are created, each with different filtering. One of the images is filtered so that only foreground information, or fragments thereof, remain. This image serves as the initial image for subsequent image restoration, while the remaining images represent reference images for the image restoration. In a second stage, the image restoration is carried out so that as much as possible of the foreground information which was lost by filtering from the initial image is restored again. By comparing information from the initial image with information from at least one reference image, the information remaining in the initial image is supplemented by foreground information from at least one reference image.