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: A process for preparing a salt-free aqueous hydroxylamine solution by reacting an aqueous solution of a hydroxylammonium salt with a base to give a mixture and separating from said mixture by distillation a salt-free aqueous hydroxylamine solution, comprises using as a base an aqueous solution of a mixture of NaOH and KOH in a molar ratio Na+:K+ in the range from 70:30 to 95:5 and with a total concentration of Na+ and K+ in the range from 0.1 to 10 m/m % based on the total amount of the mixture.

Abstract: Hydroxylamine solutions stabilized using tri(4-(2,3-dihydroxyphenyl)-4-oxabutyl)amine, tri(4-(2,3-dihydroxyphenyl)-4-keto-3-azabutyl)amine or salts thereof, and methods of stabilizing hydroxylamine solutions using these compounds.

Abstract: A piston rod-less linear drive has an elongated housing containing a guide slide moving in the longitudinal direction. The connection between the entraining member and the guide slide is with the interposition of an abutment unit attached to the guide slide, such abutment unit furthermore serving to limit the path of movement of the guide slide.

Abstract: The present invention provides a continuous process for recovering acetone from a waste stream from an acetone purification stage, whereas said waste stream comprises mesityl oxide and optionally acetone by separating the waste stream in a separating device at least in one stream comprising mesityl oxide and optionally a further stream comprising acetone, by than concentrating mesityl oxide in the mesityl oxide containing stream and finally by recycling the concentrated mesityl oxide stream to the separating device and bringing it into contact with a basic or acidic aqueous medium or with an acidic catalyst in the presence of water whereby mesityl oxide is at least partially hydrolyzed to acetone.

Abstract: The present invention claims a process and an apparatus for the work-up by distillation of cleavage product mixtures produced in the cleavage of alkylaryl hydroperoxides. Usually, in the work-up by distillation of cleavage product mixtures which are produced in the cleavage of alkylaryl hydroperoxides, the cleavage product mixture is divided into three main fractions, for which at least two distillation columns are used. The use of two distillation columns has the disadvantage that the capital costs, and also the energy costs, in these conventional processes are relatively high. By means of the inventive process for the work-up by distillation of cleavage product mixtures, the equipment requirements and the energy consumption can be markedly reduced in comparison with customary plants, since the cleavage product mixture can be resolved into the three main fractions in only one apparatus.

Abstract: The invention relates to a process for the preparation of cumene by reacting isopropanol or a mixture of isopropanol and propene with benzene in presence of a &bgr;-zeolite catalyst having a SiO2/Al2O3 molar ratio greater than 10:1 that can be integrated in a process for preparing phenol, which comprises the steps I. preparation of cumene as described above, II. oxidation of cumene to cumene hydroperoxide, III. acid-catalyzed cleavage of cumene hydroperoxide to give phenol and acetone and IV. hydrogenation of acetone to form isopropanol. In the reaction of isopropanol with benzene, propene is formed by dehydration of isopropanol simultaneously with the alkylation of benzene to cumene by means of isopropanol and the propene formed is likewise used for the alkylation of benzene to cumene. Formation of n-propylbenzene in this process step according to the invention is barely observed or is in the range below 150 wppm.

Abstract: Phenol is separated from a mixture containing hydroxyacetone, cumene, water and phenol, by fractionating the mixture in a process with a fractional distillation step and a phase separation step to provide a single phenol fraction containing less than 300 ppm of hydroxyacetone. In the work-up by distillation of cleavage product mixtures, the hydroxyacetone can be removed from the cleavage product mixture together with a phenol fraction from which the hydroxyacetone has to be removed. A process can be used for purifying cleavage product mixtures obtained in the cleavage of alkylaryl hydroperoxides such as cumene hydroperoxide. The process allows separation of phenol and acetone from mixtures obtained in the cleavage of cumene hydroperoxide.

Abstract: A process is described for preparing metal formate/formic acid mixtures comprising the following steps:

Abstract: The invention relates to a device for manual replacement of a roller (1) of a copying machine, the roller being equipped with carrying means, in which it can turn freely around its center axis (X1), and the machine (F) on the one hand having rollers (1; 2) in a roller pair arrangement for routing through and delivering a recording medium (S) in the form of a sheet or strip, which rollers can be operated in rotation in an adjoining, axially parallel arrangement in the bearing points (L1; L2; L3; L4) of the machine, and are supported by their axial ends, and on the other hand there being manually activated means for releasing/fixing the rollers in their bearing points and for separating/compressing (3) the rollers in the radial direction for purposes of removing them from and inserting them into their bearing points.

Abstract: Compounds of the formula (I)

Abstract: Unsupervised learning of object category from images is carried out by using an automatic image recognition system. A plurality of training images are automatically analyzed using an interest operator which produces an indication of features. Those features are clustered using a vector quantizer. The model is learned from the features using expectation maximization to assess a joint probability of which features are most relevant.

Abstract: A process for reducing the salt content of fractions comprising high boilers obtained in the preparation of phenol from cumene, by extraction, is claimed. In the preparation of phenol from cumene, not only phenol and acetone but also by-products such as dimethyl phenyl carbinol or acetophenone are formed in the cleavage of cumene hydroperoxide. In the work-up of the cleavage product phase by distillation, these by-products are obtained as a fraction which boils only at high temperatures. These fractions further comprise alkali metal in the form of salts as a result of the neutralization by means of aqueous sodium hydroxide after the acid catalyzed cleavage. The presence of salt in this phase makes the work-up of this phase considerably more difficult. The salt is usually removed from the fraction by extraction of the fraction with water. However, considerable problems can occur if the aqueous phase cannot be cleanly separated from the organic phase.

Abstract: A device for manual replacement and transport of a roller (1) of a copying machine, for example, which makes it easier and safer for service, replacement and transport of hot, heavy and large rollers. There is provided a protective container (5) which can be slipped over a roller (1), which has been released in the machine, and its carrying apparatus. The roller (1) can be removed from the bearing points (L1, L2) of the machine with the protective container (5) using its carrying apparatus which project out of the protective container, and can be inserted into the bearing points. Carrying handles for the carrying apparatus, enable the roller to be guided into slotted openings and, can be radially inserted into bearing points, and can be removed from them. A transport container (6) into which the protective container (5) provided with the roller (1) can be manually inserted and removed.

Abstract: A digital printer or copier machine (1) is proposed for the single-sided or double-sided printing of a substrate (11), with at least one fixing device (3) for fixing toner onto the substrate (11), whereby the fixing device (3) has at least one heating device for fusing the toner. The machine has, in addition, at least one transport device (17), in order to supply the substrate (11) to the heating device, to guide it past the heating device and/or to further transport it from the heating device, whereby the transport device (17) has at least one suction belt (19) that is provided with a number of through-passage openings (21) and can be impinged with a vacuum. The machine (1) is characterized in that the suction belt (19) is constructed as a mesh.

Abstract: Methods are described, with which by expansion of metal foam it is possible in particular to manufacture pistons for brakes. This enables pistons of a very low wall thickness and high strength.

Abstract: The present invention claims a process and an apparatus for the work-up by distillation of cleavage product mixtures produced in the cleavage of alkylaryl hydroperoxides. Usually, in the work-up by distillation of cleavage product mixtures which are produced in the cleavage of alkylaryl hydroperoxides, the cleavage product mixture is divided into three main fractions, for which at least two distillation columns are used. The use of two distillation columns has the disadvantage that the capital costs, and also the energy costs, in these conventional processes are relatively high.

Abstract: The invention relates to a device for manual replacement and transport of the roller (1) of a copying machine or an electrophotographic printer.