Abstract: A process for electrochemical preparation of sodium alkoxide is performed in an electrolysis cell having three chambers, wherein the middle chamber is separated from the cathode chamber by a solid-state electrolyte permeable to sodium ions, and from the anode chamber by a diffusion barrier. The geometry of the electrolysis cell protects the solid-state electrolyte permeable to sodium ions from acidic destruction by the pH of the anolyte that falls in the course of electrolysis. The anolyte used in the process is a brine also comprising carbonates and/or hydrogencarbonates, as well as NaCl. The process solves the problem that CO2 from these carbonates and/or hydrogencarbonates forms in the electrolysis cell during the electrolysis of this brine obtained from pretreatment. The process prevents the formation of a gas bubble in the electrolysis cell that disrupts electrolysis and reduces the contamination of the chlorine with CO2.

Abstract: A handheld laser distance measuring device for a contactless distance measurement between the laser distance measuring device and a remote object uses a laser beam that is emitted by the laser distance measuring device. The laser distance measuring device includes a device-side coupling device paired with the device housing. The coupling device is configured for reversibly arranging at least one attachment device on the laser distance measuring device. By arranging the at least one attachment device on the laser distance measuring device, at least one additional functionality can be provided.

Abstract: A process for electrochemical preparation of an alkali metal alkoxide solution is performed in an electrolysis cell having three chambers. The middle chamber is separated from the cathode chamber by a solid-state electrolyte permeable to cations, for example NaSICON, and from the anode chamber by a diffusion barrier, for example a membrane selective for cations or anions.

Abstract: A process is useful for the isomerization of C4 to C9 olefins having an internal double bond into the corresponding olefins having a terminal double bond using a heterogeneous catalyst system of a silicon-aluminium mixed oxide composition.

Abstract: A process for electrochemical preparation of sodium alkoxide is performed in an electrolysis cell having three chambers, wherein the middle chamber is separated from the cathode chamber by a solid-state electrolyte permeable to sodium ions, and from the anode chamber by a diffusion barrier. The geometry of the electrolysis cell protects the solid-state electrolyte permeable to sodium ions from acidic destruction by the pH of the anolyte that falls in the course of electrolysis. The anolyte used in the process is a brine also comprising carbonates and/or hydrogencarbonates, as well as NaCl. The process solves the problem that CO2 from these carbonates and/or hydrogencarbonates forms in the electrolysis cell during the electrolysis of this brine obtained from pretreatment. The process prevents the formation of a gas bubble in the electrolysis cell that disrupts electrolysis and reduces the contamination of the chlorine with CO2.

Abstract: A process for electrochemical preparation of an alkali metal alkoxide solution is performed in an electrolysis cell having three chambers. The middle chamber is separated from the cathode chamber by a solid-state electrolyte permeable to cations, for example NaSICON, and from the anode chamber by a diffusion barrier, for example a membrane selective for cations or anions.

Abstract: A process is useful for the isomerization of C4 to C9 olefins having an internal double bond into the corresponding olefins having a terminal double bond using a heterogeneous catalyst system of a silicon-aluminium mixed oxide composition.

Abstract: A handheld laser distance measuring device for a contactless distance measurement between the laser distance measuring device and a remote object uses a laser beam that is emitted by the laser distance measuring device. The laser distance measuring device includes a device-side coupling device paired with the device housing. The coupling device is configured for reversibly arranging at least one attachment device on the laser distance measuring device. By arranging the at least one attachment device on the laser distance measuring device, at least one additional functionality can be provided.

Abstract: The invention relates to a process for preparing 1,3-butadiene by heterogeneously catalysed oxidative dehydrogenation of n-butene, in which a butene mixture comprising at least 2-butene is provided. The problem that it addresses is that of specifying a process for economically viable preparation of 1,3-butadiene on the industrial scale, which is provided with a butene mixture as raw material, wherein the 1-butene content is comparatively low compared to the 2-butene content thereof, and in which the ratio of 1-butene to 2-butene is subject to variation. This problem is solved by a two-stage process in which, in a first stage, the butene mixture provided is subjected to a heterogeneously catalysed isomerization to obtain an at least partly isomerized butene mixture, and in which the at least partly isomerized butene mixture obtained in the first stage is then subjected, in a second stage, to oxidative dehydrogenation. The two-stage process leads to higher butadiene yields compared to the one-stage process.

Abstract: The invention relates to a process for the production of 1,3-butadiene from ethene by way of oligomerization and oxidative dehydrogenation. It is based on the finding that the 1-butene content of a feed material of an oxidative dehydrogenation must not be too high and must therefore be reduced. This occurs by way of isomerization which, however, does not take place from 2-butene to 1-butene, but vice versa from 1-butene to 2-butene. If, according to the invention, isomerization is carried out between the ethene dimerization and the oxidative dehydrogenation of 1-butene to 2-butene, it is possible to achieve a high yield of butadiene and reduce the formation of by-product.

Abstract: The invention relates to a method for producing urethanes or ureas or mixtures of urethanes and ureas by oxidative carbonylation of organic amines in the presence of carbon monoxide, oxygen and a catalyst, where the catalyst used is a transition metal complex containing the structural feature: [Mn+(O˜N˜O)2?](n?2)+(L)m(Z?)n?2 and the method is carried out under halogen-free reaction conditions. The invention further relates to transition metal complexes containing said structural feature and also to the use of such transition metal complexes as catalysts in the production of urethanes or ureas or mixtures of urethanes and ureas.

Abstract: The invention relates to a method for producing hydrogen by selective dehydration of formic acid using a catalytic system consisting of a transition metal complex of transition metal salt and at least one tripodal, tetradentate ligand, wherein the transition metal is selected from the group comprising Ir, Pd, Pt, Ru, Rh, Co and Fe. The transition metal complex can be used either as a homogeneous catalyst or a heterogenised metal complex, which has been applied to a carrier.

Abstract: The invention relates to novel complexes and to the use thereof as photosensitizers for generating hydrogen from water.

Abstract: The invention relates to a method for producing urethanes or ureas or mixtures of urethanes and ureas by oxidative carbonylation of organic amines in the presence of carbon monoxide, oxygen and a catalyst, where the catalyst used is a transition metal complex containing the structural feature: [Mn+(O˜N˜O)2?](n-2)+(L)m(Z?)n-2 and the method is carried out under halogen-free reaction conditions. The invention further relates to transition metal complexes containing said structural feature and also to the use of such transition metal complexes as catalysts in the production of urethanes or ureas or mixtures of urethanes and ureas.

Abstract: The aim of the invention is to improve the cleaning power of detergents and cleaning agents, especially with regard to bleachable stains, while avoiding any damage to the textile treated with said detergents and cleaning agents. For this purpose, a bleach catalyst in the form of a complex of Fe—, Mo—, Mn— and/or W with a ligand having a skeleton of formula (I) is used.

Abstract: A bleach catalyst includes a complex of Fe—, Mo—, Mn— and/or W with a ligand having a skeleton of formula (I).