Abstract: An actuating device includes an exhaust flap of a supercharging pressure control of turbocharged internal combustion engines. The exhaust flap is arranged pivotably in an exhaust pipe, in particular in the housing of a turbine of an exhaust-gas turbocharger, and controls in dependence on the compressor-side supercharging pressure the opening cross section of a bypass line which circumvents the turbine. The exhaust flap is arranged on an actuator arm which is fastened on a shaft mounted rotatably in the exhaust pipe and adjustable from outside the exhaust pipe via an adjustment lever and a control rod which is articulated thereto and via a linear control motor. In order to avoid vibration-induced buzzing noise in the actuating device, a friction damper is connected into the force flow between the shaft and the control rod, in particular for system damping in the region of the exhaust flap.

Abstract: An actuating device includes an exhaust flap of a supercharging pressure control of turbocharged internal combustion engines. The exhaust flap is arranged pivotably in an exhaust pipe, in particular in the housing of a turbine of an exhaust-gas turbocharger, and controls in dependence on the compressor-side supercharging pressure the opening cross section of a bypass line which circumvents the turbine. The exhaust flap is arranged on an actuator arm which is fastened on a shaft mounted rotatably in the exhaust pipe and adjustable from outside the exhaust pipe via an adjustment lever and a control rod which is articulated thereto and via a linear control motor. In order to avoid vibration-induced buzzing noise in the actuating device, a friction damper is connected into the force flow between the shaft and the control rod, in particular for system damping in the region of the exhaust flap.

Abstract: Process for preparing monodisperse weakly basic or optionally strongly basic anion exchangers of the poly(meth)acrylamide type, the ion exchangers themselves and their use.

Abstract: The alkaline saponification of acrylonitrile bead polymers provides weakly acidic cation exchangers with little intrinsic color and with reduced residual nitrogen content if the saponification is begun at a temperature T1 of from 70 to 120° C. and, once a degree of saponification of at least 65% has been reached, is completed at a temperature T2 of from 120 to 180° C.

Abstract: The present invention relates to a method for producing iron oxide/iron oxyhydroxide-containing carboxyl-bearing ion exchangers, which is characterized in that a) a bead-type carboxyl-containing ion exchanger is contacted in aqueous suspension with iron(III) salts or a?) an aminomethylated crosslinked polystyrene bead polymer is contacted in aqueous suspension with iron(III) salts and with chloroacetic acid and b) the suspensions obtained from stages a) or a?) are adjusted to pHs in the range from 3 to 14 by adding alkali metal hydroxides or alkaline earth metal hydroxides and the resultant iron oxide/iron oxyhydroxide-containing ion exchangers are isolated by known methods, to the ion exchangers themselves their, and also to their use for the adsorption of heavy metals, in particular arsenic.

Abstract: The present invention relates to a process for the preparation of iron-oxide- and/or iron-oxyhydroxide-containing ion exchangers by polymerizing iron-oxide- and/or iron-oxyhydroxide-containing mixtures and functionalizing the resultant polymers.

Abstract: The present invention relates to devices through which a liquid to be treated can flow, preferably filtration units which are used packed with iron-doped ion exchangers for removing heavy metals from aqueous media, and also to methods for production thereof and use thereof.

Abstract: The present invention relates to a method for producing iron oxide/iron oxyhydroxide-containing carboxyl-bearing ion exchangers, which is characterized in that a) a bead-type carboxyl-containing ion exchanger is contacted in aqueous suspension with iron(III) salts or a?) an aminomethylated crosslinked polystyrene bead polymer is contacted in aqueous suspension with iron(III) salts and with chloroacetic acid and b) the suspensions obtained from stages a) or a?) are adjusted to pHs in the range from 3 to 14 by adding alkali metal hydroxides or alkaline earth metal hydroxides and the resultant iron oxide/iron oxyhydroxide-containing ion exchangers are isolated by known methods, to the ion exchangers themselves their, and also to their use for the adsorption of heavy metals, in particular arsenic.

Abstract: The present invention relates to devices through which a liquid to be treated can flow, preferably filtration units which are used packed with iron-doped ion exchangers for removing heavy metals from aqueous media, and also to methods for production thereof and use thereof.

Abstract: The present invention relates to a process for preparing novel, monodisperse anion exchangers by (a) reacting monomer droplets made from monovinylaromatic compounds and polyvinylaromatic compounds, and optional porogens and/or initiators, (b) amidomethylating the resultant monodisperse, crosslinked bead polymers with phthalimide derivatives, (c) converting the amidomethylated bead polymers to aminomethylated bead polymers, and (d) alkylating the aminomethylated bead polymers.

Abstract: The alkaline saponification of acrylonitrile bead polymers provides weakly acidic cation exchangers with little intrinsic color and with reduced residual nitrogen content if the saponification is begun at a temperature T1 of from 70 to 120° C. and, once a degree of saponification of at least 65% has been reached, is completed at a temperature T2 of from 120 to 180° C.

Abstract: Disclosed herein is the polymerization of monodisperse microencapsulated monomer droplets to produce monodisperse non-microencapsulated bead polymers through the addition strong alkalis or strong acids during the polymerization.

Abstract: The present invention relates to a process for the preparation of iron-oxide- and/or iron-oxyhydroxide-containing ion exchangers by polymerizing iron-oxide- and/or iron-oxyhydroxide-containing mixtures and functionalizing the resultant polymers.

Abstract: Process for preparing monodisperse weakly basic or optionally strongly basic anion exchangers of the poly(meth)acrylamide type, the ion exchangers themselves and their use.

Abstract: The present invention relates to a process for preparing novel, monodisperse anion exchangers having strongly basic functional groups either in the center of the resin particle or in the shell of the resin particle, as well as to their use.

Abstract: The invention relates to processes for the preparation of free-flowing end products of strongly acidic cation exchangers. In the case of the strongly acidic cation exchangers prepared by the processes described in Patent Application P 195 48 012.0, the particle beds of the end products are not free-flowing. By additions of wetting agents or water-soluble initiators or surfactants in the polymerization stage or after the filtration of the end product and/or process engineering means, a permanent or temporary free flowability of the particle beds of the strongly acidic cation exchangers is achieved using the following processes. 1. By additions of known wetting agents in amounts of 0.25 g/l of aqueous phase or water-soluble initiators in amounts of 0.05 to 20 g/l of aqueous phase to the copolymerization system 20 minutes to 120 minutes after reaching the gel point. 2. By treatment of the strongly acidic cation exchangers with aqueous solutions of surface-active substances having a content of 0.

Abstract: Process for preparing monodisperse weakly basic or optionally strongly basic anion exchangers of the poly(meth)acrylamide type, the ion exchangers themselves and their use.

Abstract: The invention relates to a process for preparing gel-type cation exchangers of high osmotic and mechanical stability and enhanced stability to oxidation by a seed/feed process, the seed used being a polymer containing 3.5-7% by weight of crosslinker.

Abstract: The object of the present invention is a process for preparing novel heterodisperse chelating resins having chelating functional groups, and their use for adsorbing metal compounds, in particular alkaline earth metals, heavy metal compounds and precious metal compounds, and also for extracting alkaline earth metals from saline solutions derived from alkali metal chloride electrolysis, and also in hydrometallurgy.

Abstract: The invention relates to sulfonated bead polymers prepared from styrene, vinylpyridines, further monomers, and crosslinkers, to a process for preparing them, and to their use as cation exchangers.