Abstract: A filter device for cleaning a gas flow has a hollow cylindrical pre-separator on whose outer side guide vanes are arranged. At least a portion of the guide vanes is provided with a rib that protrudes over the guide vane surface.

Abstract: A cyclone separator has a cyclone arrangement with individual cyclones each provided with a cell tube and guide device. The guide device causes a gas stream passing through the cell tube to rotate. At least one particle discharge is positioned perpendicularly to a longitudinal axis of the cyclone separator and discharges separated particles that have been separated from the gas stream in the cyclone arrangement. The cell tubes, for a targeted discharge of the separated particles, each have at least one particle outlet opening that is facing the particle discharge. The particle outlet openings of at least some of the individual cyclones, neighboring each other in the direction of a first perpendicular line that is perpendicular relative to the longitudinal axis of the cyclone separator, are displaced relative to each other in the direction of the longitudinal axis of the cyclone separator.

Abstract: A filter device has a compact filter made of a filter material that is wound spirally. A star filter that is made of a filter material that has folds arranged in a star shape surrounds the compact filter. The filter device has a cylindrical shape. A fluid to be filtered passes the compact filter in an axial direction and the star filter in a radial direction. The filter device is exchangeable and is mounted in a filter housing such that the compact filter and the star filter have a common raw side and a common clean side that are separated from each other.

Abstract: Process for the preparation of N-vinylcarboxamides by pyrolysis of a compound of the formula CH3—CH(CN)—N(R)—CO—R1??(I), in which R and R1 are H or C1- to C6-alkyl, in the presence of solids which are doped with alkali metal or alkaline earth metal ions, under reduced pressure at a temperature of from 330 to 750° C. with elimination of hydrogen cyanide, cooling, separation and isolation of the reaction products, a solid arranged in a tubular reactor being treated at a temperature in the range from 0 to 250° C. with a solution of an alkali metal and/or alkaline earth metal base, the solution being discharged, the remaining solvent which adheres to the catalyst thus obtainable being evaporated and said catalyst then being heated to a temperature of at least 380° C. for activation.

Abstract: A process for the hydrolysis of polymers comprising vinylcarboxamide units by heating polymers comprising vinylcarboxamide units in an aqueous medium in the presence of acids or bases, wherein an aqueous solution or dispersion of a polymer comprising vinylcarboxamide units and an aqueous solution or a base or acid are fed continuously to a tubular reactor at elevated pressure, from 0.05 to less than one equivalent of a base or acid being used per vinylcarboxamide equivalent and the mixture being passed through the tubular reactor at a temperature of >100° C. to 250° C., depressurized and cooled.

Abstract: A process for removing carbonaceous deposits on surfaces of catalysts and plant parts by treating the deposits with a superheated stream of steam admixed at least temporarily with an oxygenous gas is provided, which involves, in each case monitoring the offgas CO2 content after condensation of the steam, at a temperature of at least 300° C.: (a) treating the carbonaceous deposits with superheated steam at a temperature of at least 300° C. until the CO2 content of the offgas has exceeded a maximum; (b) then, with further supply of superheated steam, commencing oxygen supply, the amount of oxygen supplied being adjusted such that the CO2 content in the offgas decreases further until it has fallen to a value of <1% by volume; and then (c) ending the supply of superheated steam and passing an oxygenous gas over remaining amounts of carbonaceous deposits until the deposits have been virtually removed.

Abstract: A filter device has a compact filter made of a filter material that is wound spirally. A star filter that is made of a filter material that has folds arranged in a star shape surrounds the compact filter. The filter device has a cylindrical shape. A fluid to be filtered passes the compact filter in an axial direction and the star filter in a radial direction. The filter device is exchangeable and is mounted in a filter housing such that the compact filter and the star filter have a common raw side and a common clean side that are separated from each other.

Abstract: The invention relates to a transmission arrangement, particularly for adjusting devices in motor vehicles, comprising a gear wheel, which is secured against axial displacement on an axis or a shaft by means of securing element. According to the invention, the axis or the shaft is made of plastic. The securing elements comprise at least a molded part, which has at least one axial stop for the direct or indirect support of the gear wheel, and the molded part is secured by means of a screw against axial displacement on the axis or the shaft.

Abstract: Process for the preparation of N-vinylcarboxamides by pyrolysis of a compound of the formula CH3—CH(CN)—N(R)—CO—R1 ??(I), in which R and R1 are H or C1- to C6-alkyl, in the presence of solids which are doped with alkali metal or alkaline earth metal ions, under reduced pressure at a temperature of from 330 to 750° C. with elimination of hydrogen cyanide, cooling, separation and isolation of the reaction products, a solid arranged in a tubular reactor being treated at a temperature in the range from 0 to 250° C. with a solution of an alkali metal and/or alkaline earth metal base, the solution being discharged, the remaining solvent which adheres to the catalyst thus obtainbale being evaporated and said catalyst then being heated to a temperature of at least 380° C. for activation.

Abstract: A process for the hydrolysis of polymers comprising vinylcarboxamide units by heating polymers comprising vinylcarboxamide units in an aqueous medium in the presence of acids or bases, wherein an aqueous solution or dispersion of a polymer comprising vinylcarboxamide units and an aqueous solution or a base or acid are fed continuously to a tubular reactor at elevated pressure, from 0.05 to less than one equivalent of a base or acid being used per vinylcarboxamide equivalent and the mixture being passed through the tubular reactor at a temperature of >100° C. to 250° C., depressurized and cooled.

Abstract: A process for removing carbonaceous deposits on surfaces of catalysts and plant parts by treating the deposits with a superheated stream of steam admixed at least temporarily with an oxygenous gas, which comprises, in each case with monitoring of the CO2 content in the offgas after condensation of the steam, at a temperature of at least 300° C., (a) treating the carbonaceous deposits with superheated steam at a temperature of at least 300° C. until the CO2 content of the offgas has exceeded a maximum, (b) then, with further supply of superheated steam, commencing the supply of oxygen, the amount of oxygen supplied being adjusted such that the CO2 content in the offgas decreases further until it has fallen to a value of <1% by volume, and then (c) ending the supply of superheated steam and passing an oxygenous gas over the amounts of carbonaceous deposits still remaining until the deposits have been virtually removed.

Abstract: Process for the preparation of sulfuric acid monoesters of aminoalkanols by reacting sulfuric acid with aminoalkanols and removing the water forming in the reaction from the reaction mixture, sulfuric acid and at least one aminoalkanol being mixed and the hot reaction mixture forming being passed with turbulent flow into a container and being quenched therein with a fluid.

Abstract: The invention relates to a transmission arrangement, particularly for adjusting devices in motor vehicles, comprising a gear wheel, which is secured against axial displacement on an axis or a shaft by means of securing element. According to the invention, the axis or the shaft is made of plastic. The securing elements comprise at least a molded part, which has at least one axial stop for the direct or indirect support of the gear wheel, and the molded part is secured by means of a screw against axial displacement on the axis or the shaft.

Abstract: A fluid filter, having a filter element (10) which can be inserted into a filter housing (2), characterized in that the filter element (10) has at least one assembly aid element (12) which is assigned a corresponding housing-side assembly aid element (11) in such a way that the housing-side assembly aid element (11) and the filter-side assembly aid element (12) engage into one another in the installed situation.

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: Method of purifying an open-chain N-vinyl compound by crystallization in a crystallizer, the crystallization being carried out from a melt of a mixture comprising open-chain N-vinyl compound at a pressure of 10?3 to 400 bar.

Abstract: The invention relates to a device for adjusting a vehicle seat, the frame structure (4, 5, 6) of which can be adjusted using drive motors (40) having presupported gear units (39), and the vehicle seat is accommodated on two seat rails (1, 2) arranged parallel to each other. The frame structure (4, 5, 6) of the vehicle seat can be adjusted spherically using lifting elements (8, 9, 10) in two planes separated from each other.

Abstract: Process for the preparation of sulfuric acid monoesters of aminoalkanols by reacting sulfuric acid with aminoalkanols and removing the water forming in the reaction from the reaction mixture, sulfuric acid and at least one aminoalkanol being mixed and the hot reaction mixture forming being passed with turbulent flow into a container and being quenched therein with a fluid.

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 filter element for filtering a fluid stream, comprising a cylindrical support body, which is provided with openings and is sealed at one axial end, and a filter medium arranged on the support body. The filter medium is a strip material, which extends over approximately the entire length of the support body, and is wrapped around the circumference of the support body, and the start and the end of the strip material are welded together.