Abstract: A layer or coating which counteracts crystalline deposits on a substrate includes a matrix composed of a binder system and ceramic particles, and also boron nitride in particle form, wherein the boron nitride particles are incorporated into the matrix and are distributed essentially homogeneously therein.

Abstract: A fuel delivery unit for delivering fuel from a fuel container to an internal combustion engine of a motor vehicle, comprising a plurality of components, with the components being a flange for closing an opening in the fuel container, a splash pot which is connected to the flange by means of supporting elements a fuel pump which is arranged in said splash pot, a fuel filter, a pressure regulator, a filling level sensor and a pump pre-filter, and means for connecting each individual component to a ground potential of the motor vehicle. Components through and around which fuel flows are connected to the ground potential by means of at least two electrically conductive connections.

Abstract: A conveying device (1) has a fuel pump (5) for supplying an internal combustion engine (2) of a motor vehicle with fuel. The conveying device further has a monitoring apparatus (10) for determining the wear condition or the degree of soiling of the fuel pump (5). To this end, the monitoring apparatus (10) compares the power consumption to the hydraulic power of the fuel pump (5). A diagnostic display (11) is activated when a predefined value for the power consumption is exceeded.

Abstract: A device (1) for supplying electric current to the fuel pump (2) of a motor vehicle internal combustion engine (3) comprises a DC/DC converter (13) which increases voltage to a predetermined value in the event of a voltage drop of a direct current source (7). This ensures an adequate voltage supply of the fuel pump (2) even at low voltages of the direct voltage source. When the voltage (15) of the direct voltage source (7) is sufficient, the DC/DC converter (13) is bridged, so that the fuel pump (2) is directly supplied with fuel from the direct voltage source (7). The DC/DC converter is also bridged when the device is faulty.

Abstract: Process for recovering cyclododecatriene (CDT) from a solution comprising CDT and high boilers such as deactivated catalyst and polymers, which comprises feeding the solution into a preheater and heating it, subsequently depressurizing it through a downstream pressure maintenance device and feeding the resulting two-phase mixture into a helical tube evaporator and there reducing the CDT content of the liquid phase by partial evaporation and discharging a gaseous product stream having an increased concentration of CDT.

Abstract: A fuel-supply unit for a motor vehicle has a fuel container (2) that has several chambers (6, 7). The unit has a transfer pump (5) that is located inside the fuel container (2) for exclusively supplying ejector pumps (9, 10), which are positioned in the chambers (6, 7), with fuel as the pumping fluid. A primary fuel pump (4) that is located outside the fuel container (2) supplies an internal combustion engine (1) of the motor vehicle with fuel. The transfer pump (5) is operated discontinuously to prevent unnecessary power consumption.

Abstract: In a process for the purification of triethylenediamine (TEDA) in which TEDA is vaporized and the gaseous TEDA is passed into a liquid solvent and is subsequently crystallized from this, the mother liquor obtained after the TEDA has been crystallized is extracted with an extractant which is immiscible or only slightly miscible with the solvent of the mother liquor and in which TEDA is readily soluble, and the TEDA-depleted mother liquor obtained after extraction and/or the TEDA-enriched extractant which has been used for the extraction are/is returned to the process.

Abstract: A process for preparing a high-concentration formaldehyde solution by removing water from a lower-concentration formaldehyde solution having a formaldehyde content of from 5 to 50% by weight, in which the lower-concentration formaldehyde solution is fed to a preheater and heated in the preheater, depressurized via a pressure maintenance device and concentrated in a helical tube evaporator to give a vapor stream and the high-concentration formaldehyde solution as bottom stream, wherein the heated lower-concentration formaldehyde hyde solution is depressurized in the pressure maintenance device to give a two-phase mixture which is fed into the helical tube evaporator, is proposed.

Abstract: Disclosed is a method for checking for errors in the measured value or values of one or more filling level sensors arranged in a fuel tank of a motor vehicle, characterized in that the measured values of a plurality of measurements are sensed and are each compared with a further physical variable for plausibility. If the measured values are not plausible, a warning signal is fed to a warning device and a warning information item is triggered by the warning device.

Abstract: A process for preparing a high-concentration formaldehyde solution by removing water from a lower-concentration formaldehyde solution having a formaldehyde content of from 5 to 50% by weight, in which the lower-concentration formaldehyde solution is fed to a preheater and heated in the preheater, depressurized via a pressure maintenance device and concentrated in a helical tube evaporator to give a vapor stream and the high-concentration formaldehyde solution as bottom stream, wherein the heated lower-concentration formaldehyde hyde solution is depressurized in the pressure maintenance device to give a two-phase mixture which is fed into the helical tube evaporator, is proposed.

Abstract: The invention relates to a filling level sensor for a fuel tank with a float which is fastened to a lever arm and at least one contact which is arranged on the lever arm and is in connection with a slider track formed as a thick-film resistor. The thick-film resistor consists of at least two precious metals, one precious metal being silver and present in a smaller proportion than the other precious metal.

Abstract: A method for manufacturing an electronic circuit device in a motor vehicle fuel tank, the method including arranging one or more electronic modules on a substrate, and fixating the substrate with respect to a fuel tank wall. This allows the electronics to be positioned close to the fuel proper, and the method encapsulates the one or more electronic modules against the fuel by a cap that is connected to the substrate so as to form an encapsulated space that is separated from any fuel or vapour outside the encapsulated space. The electronic modules may provide various different functional principles, e.g. fuel level measuring or demand regulated fuel pump control.

Abstract: A feed unit (2) for feeding fuel out of a fuel tank (1) has a baffle (4) having two chambers (7, 13) which are connected to each other via a valve (14) designed as a throttle valve. A fuel pump (5) projects with a suction opening (6) into the first chamber (7). When the fuel tank (1) is emptied, the first chamber (7) is emptied. Over a period of time dependent on the throttling of the valve (14) fuel flows out of the second chamber (13) into the first chamber (7) and covers the suction opening (6). This ensures that, after the period of time, the fuel pump (5) can suck up fuel.

Abstract: Highly pure triethylenediamine is obtained by a process in which triethylenediamine is freed from high boilers and then the triethylenediamine is vaporized from the mixture thus obtained and is passed into a liquid solvent. The process makes it possible in particular to obtain highly pure solutions of triethylenediamine. Crystallization is generally unnecessary.

Abstract: Process for purifying triethylenediamine (TEDA) by disillation, in which the fractionation is carried out in a dividing wall column.

Abstract: The invention relates to a method for producing a highly pure, aqueous hydroxylamine solution by distilling an aqueous solution, devoid of salt, of a hydroxyl ammonium salt in a plate column comprising at least two mechanical plates. Said method is characterised in that packing bodies are arranged between at least two plates of the plate column over the cross-section of said column.

Abstract: In a feed device (2) for a motor vehicle, a ventilation element (10) is arranged in a feed line (7) which is guided into an intermediate tank (8) arranged upstream of a surge chamber (3). The ventilation element (10) has an opening (11) which is closed when the fuel is flowing and is released if the flow fails. Drainage of the intermediate tank (8) by means of a siphon effect is therefore avoided.

Abstract: An apparatus is arranged for providing drive-off security in a motor vehicle environment through blocking one or more vehicle engine system subfunctions (18), such blocking is triggered by detecting an unauthorized system activation. In particular, a particular sub-function facility comprises (14) an on-off control circuit (14) pertaining to and controlling a fuel pump arrangement functionality (18).

Abstract: In a fuel container (1) for a motor vehicle having a plurality of chambers (2, 4), a suction jet pump (18, 19) with a filling level sensor (11, 12) is arranged in each of the individual chambers (2, 4). A valve (24, 25) is arranged in a propellant line (20, 21) leading to the suction jet pump (18, 19). When a chamber (2, 4) is virtually empty, the supply of fuel to the suction jet pump (18, 19) is disabled and an unnecessary movement of the fuel is thus avoided.

Abstract: A process for preparing a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of a hydroxylammonium salt and a base in a tray column having at least two mechanical trays, wherein random or structured packings are located above at least one tray of the tray column over the cross section of the column.