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

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: 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).

Abstract: A device for sampling fluid is provided which comprises a plurality of sample vessels uniformly spaced apart in a circle and means for the alternate feeding of fluid into the individual sample vessels. A buffer vessel whose volume is at least three to five times greater than that of each individual sample vessel is connected upstream in series to the sample vessels. The sample vessels are U-shaped and have two substantially upright tubular arms which are joined together at their bottom ends. One arm is smaller in diameter and ends below the opening of the other arm or has a mouth or opening below the opening of the other arm. The means for feeding the fluid enter the thicker and higher arm of the sample vessels and are so built as to be able to empty the entire contents of the buffer vessel in the course of at most one to two minutes into the sample vessel.