Abstract: In a thermoelectric generator or Peltier arrangement having a thermoelectrically active semiconductor material constituted by a plurality of metals or metal oxides the thermoelectrically active material is selected from a p- or n-doped semiconductor material constituted by a ternary compound of the general formula (I) MexSAySBz  (I) with Me=Al, Ti, Zr, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Co, Ni, Cu or Ag, SA, SB=B, C, Si, Ge, Sb, Se or Te, where SA and SB respectively come from different groups of the periodic table, x, y, z independently of one another have values from 0.

Abstract: A mixture Ia comprises a mix IIa composed of

Abstract: The invention relates to a process for the preparation of organic disulfides by oxidation of mercaptans with sulfur dissolved in an organic disulfide using an amine as catalyst, where the mercaptans are used as “crude mercaptan stream” from a reaction of alcohols with hydrogen sulfide over a catalyst suitable for mercaptan synthesis. Furthermore, the invention relates to the use of the organic disulfides for the preparation of alkanesulfonic acids.

Abstract: Alkali metal alkoxides are prepared by reacting alkali metal amalgam with alcohol in the presence of a catalyst comprising iron having a carbon content of at least 0.3% by weight.

Abstract: Capacitors comprising an inert porous shaped body onto which a first electrically conductive layer, a second layer of barium titanate and a further electrically conductive layer have been applied.

Abstract: Process for preparing barium titanate or strontium titanate by reacting titanium alkoxides with barium hydroxide hydrate or strontium hydroxide hydrate in a C1-C8-alcohol or a glycol ether at from 50 to 150° C.

Abstract: A mixture Ia comprises a mix IIa composed of a) from 1 to 95% by weight of a solid III, preferably a basic solid III, with a primary particle size of from 5 nm to 20 &mgr;m and b) from 5 to 99% by weight of a polymeric composition IV, obtainable by polymerizing b1) from 5 to 100% by weight, based on the composition IV, of a condensation product V of &agr;) at least one compound VI which is capable of reacting with a carboxylic acid or with a sulfonic acid or with a derivative or a iixture of two or more of these, and &bgr;) at least 1 mol per mole of the compound VI of a carboxylic acid or sulfonic acid VII which has at least one functional group capable of free-radical polymerization, or of a derivative thereof or of a mixture of two or more thereof and b2) from 0 to 95% by weight, based on the composition IV, of another compound VIII with an average molecular weight (number average) of at least 5000 having polyether segments in its main or side chain and at least one ester of the formula (E1) to (E5)

Abstract: In the process for preparing phosphorus-nitrogen compounds by reacting phosphorus sulfides with an amino component which

Abstract: In a thermoelectric generator or Peltier arrangement having a thermoelectrically active semiconductor material constituted by a plurality of metals or metal oxides the thermoelectrically active material is selected from a p- or n-doped semiconductor material constituted by a ternary compound of the general formula (I)

Abstract: Polyalkylene polysulfides, comprising chains of the formula I 1

Abstract: In a photovoltaic cell having a photovoltaically active semiconductor material constituted by a plurality of metals or metal oxides, the photovoltaically active material is selected from a

Abstract: Compounds of the formula (I)

Abstract: A process for preparing alkanesulfonic acids from dialkyl sulfites comprises the following steps: rearrangement of dialkyl sulfite in the presence of a suitable catalyst to form the corresponding alkyl alkanesulfonate and hydrolysis of the resulting alkyl alkanesulfonate to give the corresponding alkanesulfonic acid.

Abstract: Alkali metal methoxides are prepared from aqueous alkali metal hydroxide, which may have been admixed with methanol, and methanol in a reaction column having at least 5, preferably from 15 to 30, theoretical plates between the feed point for the aqueous alkali metal hydroxide and the feed point for the methanol. The gaseous methanol/water mixture formed in the reaction is fractionated in a rectification column.

Abstract: In a generator comprising a p-doped or n-doped semiconductor material, said semiconductor material is at least one ternary material selecting from one of the following substance classes and formed by combining at least two compounds of the substance class: suicides, borides, germanides, tellurides, sulfides, selenides, antimonides, plumbides and semiconductor oxides.

Abstract: Dimethyl sulfite is prepared by transesterification of a cyclic alkylene sulfite of at least 2 carbon atoms with methanol, in the presence or absence of a catalyst, by a process which is carried out continuously in a column.

Abstract: Alkali metal alkoxides are prepared by reacting alkali metal amalgam with alcohol in the presence of a catalyst comprising iron having a carbon content of at least 0.3% by weight.

Abstract: In a process for the combinatorial production of material samples in the form of a two-dimensional matrix in the surface region of a sheet-like substrate, at least two different dispensable material components are dispensed as a suspension from one or more dispensing devices which allow the release of individual suspension drops onto the same point of the substrate, so that materials of different composition are obtained in different surface regions of the substrate.

Abstract: Orthoesters are prepared by reacting 1,1,1-trihaloalkanes with alkali metal alkoxides in the presence of the corresponding alcohol, a slurry of the alkali metal alkoxide in the corresponding alcohol being used.

Abstract: In an extraction process for isolating trimethoxysilane (TMS) from a TMS/methanol mixture by formation of two phases, namely a TMS-rich extract phase and a methanol-rich raffinate phase, by addition of one or more methanol-soluble inorganic and/or organic salts and, if desired, an additional nonpolar organic solvent and subsequent phase separation, the amount of salt added is selected so that the weight ratio of trimethoxysilane to methanol in the extract phase is at least 94% by weight:6% by weight (normalized to 100% by weight). The use of one or more inorganic salts in an extraction process for isolating trimethoxysilane from a trimethoxysilane/methanol mixture is also claimed.