Abstract: A process is proposed for continuously purifying a solid mixture comprising a sublimable product of value and components with lower and higher sublimation temperatures by fractional sublimation/desublimation in a hot wall tubular oven (1) with supply of the solid mixture together with an inert gas stream, into which the solid mixture is dispersed by means of a dispersing unit (2), at one end of the hot wall tubular oven (1), heating the dispersed solid mixture in the hot wall tubular oven (1) at a temperature at which the product of value sublimes to obtain a gas mixture comprising components with a higher sublimation temperature than the product of value as solid particles, passing the gas mixture comprising components with a higher sublimation temperature than the product of value as solid particles through a hot gas filter (3) with a suitable pore size in order to retain the solid particles with a higher sublimation temperature than the product of value, cooling the gas mixture from which the components

Abstract: The invention relates to a process for the preparation of finely divided suspensions by melt emulsification, comprising at least one substance with a melting temperature above room temperature, comprising the following steps: (a) passing at least one preemulsion, comprising one continuous phase and one disperse phase, to a rotor-stator machine, a rotor-rotor machine or to a continuous and/or disperse phase; (b) optionally adding one or more further components to the at least one preemulsion in the rotor-stator machine; (c) emulsifying the at least one preemulsion with mechanical shear and/or elongation and/or turbulence at a temperature which is at most 10 K above the melting temperature of the at least one substance with a melting temperature above room temperature, or at a temperature which is at least 10 K below and at most 10 K above the glass transition temperature or the melting temperature, if the substance with a melting temperature above room temperature is a polymer, for producing a finely divided e

Abstract: The invention relates to a monolithic support member comprising channels with walls separating the channels from each other and having a coating deposited thereon, the non-coated channels having a polygonal cross-section profile, wherein the mean thickness dC of the coating in a corner of said cross-section profile is smaller than or equal to the mean thickness dE of the coating on an edge of said cross-section profile plus 85 micrometer; and further relates to a method for the preparation of such coated monolithic support member, the method comprising (i) providing a suspension having a viscosity in the range of from 0.5 to 100 mPas and having a solid content in the range of from 1 to 40 wt.

Abstract: The present invention relates to electrodeposition primer compositions comprising catalytically active core/shell particles CS . The electrodeposition primer compositions can be used more particularly for cathodic dip coating for the coating of automobile bodies or parts thereof.

Abstract: A method for producing nanoscale organic solid particles is proposed, starting from the corresponding sublimable organic solid as raw material, in the form of particles having an average particle diameter in the range of from 1 ?m to 10 mm, which are dispersed in a carrier gas so as to obtain a dispersion, which is relaxed in a convergent nozzle, which is followed by an expansion chamber, and wherein openings are provided rotationally symmetrically about the midaxis of the expansion chamber in the wall of the expansion chamber which comprises the product outlet opening, through which openings a secondary gas flow is injected comprising an inert gas carrier and molecules, ions or nanoscale particles contained in molecularly disperse form therein, which are different from the raw material and which have an average particle diameter that is less than the average particle diameter of the product.

Abstract: A process for coating internals in a reactor, except for the coating of electrically heatable, at least partly open-cell foams, with a catalytically active material or a precursor thereof, in which an aerosol which contains the catalytically active material or the precursor thereof as a disperse phase is provided and the aerosol is passed through the reactor at a rate in the range from 0.1 to 4 m/s, which is established so that the disperse phase of the aerosol is deposited on the internals in the reactor.

Abstract: The invention relates to processes for producing nanoparticles, especially pigment particles, comprising the following steps: i) bringing a base substance (1) into the gas phase, ii) generating particles by cooling or reacting the gaseous base substance (1), and iii) applying electrical charge to the particles during particle generation in step ii) in a nanoparticle generation apparatus. The invention further relates to apparatus for producing nanoparticles, having a feed line (28) for transporting the gas stream (29) into the apparatus, a particle generation and charging area for substantially simultaneous generation and charging of nanoparticles, and a takeoff line (30) for transporting the charged nanoparticles from the particle generation and charging area.

Abstract: The proposal is made for a process for the preparation of a minisuspoemulsion of submicron core/shell particles, wherein the starting material is a suspoemulsion of a first disperse liquid phase I in a second continuous liquid phase II, which comprises, in the first disperse liquid phase I, submicron particles of a solid C forming the core, and a precursor substance PS for the shell dissolved in molecularly disperse form and, if appropriate, a reactant R, and wherein the submicron core/shell particles CS are prepared in the first disperse liquid phase I of the suspoemulsion by chemical or physical conversion of the precursor substance PS for the shell.

Abstract: The invention provides a process for preparing isocyanates by reacting amines with phosgene, wherein the amine or a mixture of amine and a solvent is mixed in the form of an aerosol with gaseous phosgene and the amine is subsequently reacted with phosgene.

Abstract: A method is proposed for characterizing a totality of particles (318). The method can be used in particular for charactering microparticular or nanoparticular aerosols. The method comprises the following steps: a) in a classification step, a class of the totality is selected, wherein the particles (318) of the selected class have a prespecified mobility dm; b) in a counting step, a number N of the particles (318) of the selected class is determined; c) in a charge determination step, a charge Q of the particles (318) of the selected class is determined; and d) in an evaluation step, at least one morphological parameter is determined from the charge Q, the number N and the mobility dm, wherein the morphological parameter comprises at least one item of information about an agglomerate state of the particles (318).

Abstract: The invention relates to processes for producing nanoparticles, especially pigment particles, comprising the following steps: i) bringing a base substance (1) into the gas phase, ii) generating particles by cooling or reacting the gaseous base substance (1), and iii) applying electrical charge to the particles during particle generation in step ii) in a nanoparticle generation apparatus. The invention further relates to apparatus for producing nanoparticles, having a feed line (28) for transporting the gas stream (29) into the apparatus, a particle generation and charging area for substantially simultaneous generation and charging of nanoparticles, and a takeoff line (30) for transporting the charged nanoparticles from the particle generation and charging area.

Abstract: The invention relates to a process for vapor deposition of one or more compounds onto a support, in which (i) the compound is introduced in a solid or gaseous state into a carrier gas stream, (ii) the compound is present in a gaseous state in the carrier gas stream, (iii) the gaseous compound is precipitated, (iv) the compound precipitated in step (iii) is once again brought into the gaseous state, and (v) the gaseous compound is subsequently precipitated on the support, wherein the carrier gas stream comprising the gaseous compound(s) is cooled to a temperature below the sublimation temperature of the compound(s) by introduction of a gas stream.

Abstract: A process for coating internals in a reactor, except for the coating of electrically heatable, at least partly open-cell foams, with a catalytically active material or a precursor thereof is described, in which an aerosol which contains, as a disperse phase, the catalytically active material or the precursor thereof is provided and the aerosol is passed through the reactor at a velocity which is established so that the disperse phase of the aerosol is deposited on the internals in the reactor.

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: A process is proposed for reducing the aerosol-related discharge from a separation column (1) in which one or more components are separated off from a gaseous or liquid starting mixture (G) at actively separating internals (2), aerosols being present or formed in a gas phase, which comprises the actively separating internals (2) being segmented at one or more separation points, which are determined in such a manner that the aerosols have at least 50% of their maximum particle size at the separation point or separation points, and an internal (3) being provided at each separation point, which internal is operated under at least partially flooded conditions, a continuous liquid phase being formed at least in partial regions of the internal (3), to which region the aerosols are bound.

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.

Abstract: A process is proposed for reducing the aerosol-related discharge from a separation column (1) in which one or more components are separated off from a gaseous or liquid starting mixture (G) at actively separating internals (2), aerosols being present or formed in a gas phase, which comprises the actively separating internals (2) being segmented at one or more separation points, which are determined in such a manner that the aerosols have at least 50% of their maximum particle size at the separation point or separation points, and an internal (3) being provided at each separation point, which internal is operated under at least partially flooded conditions, a continuous liquid phase being formed at least in partial regions of the internal (3), to which region the aerosols are bound.

Abstract: The invendon relates to a method for the production of a salt-free aqueous hydroxylamine solution by distilling an aqueous solution of an hydroxylammonium salt and a base in a plate column having at least two mechanical plates. The invention is characterized in that packings or structured packings are placed above at least one of the plates of the plate column along the cross section of said 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: The present invention creates an apparatus for determining physical collective parameters of particles in gases, which comprises a measuring chamber with light entrance ports (121) and exit ports (123, 124) for electromagnetic radiation, an emission source (113) for electromagnetic radiation being provided and at least two detection apparatuses (114, 115) for determining the intensity of electromagnetic radiation scattered at the particles being provided, and the detection apparatuses (114, 115) detecting electromagnetic radiation of different scattering regions. The present invention further creates a method for determining physical collective parameters of particles in gases, the particles being exposed to electromagnetic radiation which is scattered at the particles, wherein the intensities of the scattered radiation of at least two different scattering regions are determined and their ratio is taken subsequently.