摘要:
The invention relates to a process for preparing aldehydes having five carbon atoms, in which an input mixture containing 10% by weight to 50% by weight of linear butenes and less than 5% by weight of 1-butene is hydroformylated with synthesis gas in the presence of a catalyst system comprising rhodium and at least one bisphosphite ligand, wherein the hydroformylation is effected in a reactor from which, over an operating period, a cycle gas containing at least a portion of the products and unconverted reactants from the hydroformylation is continuously drawn off and partly condensed, and uncondensed components of the cycle gas are recycled into the reactor, and wherein, after the operating period has expired, the hydroformylation is stopped, the reactor is freed of reaction residues and the hydroformylation is restarted. It is based on the problem of making such a process more economically viable. The problem is solved by using a bisphosphite of the formula (1) and/or (2) as ligand, extending the operating period to more than 8000 h, and not separating solid reaction residues out of the reactor during the course of the operating period.
摘要:
The invention relates to a method for enriching a homogenous catalyst from a process flow comprising said homogenous catalyst as a component, wherein the process flow is conducted over at least one membrane and wherein the membrane wholly or partially comprises a polymer that has planar polymer units connected to one another via a rigid link and wherein the linker is contorted, such that at least one planar polymer unit is connected to at least one second planar polymer unit via the link, in a non-co-planar arrangement. The invention furthermore relates to a method for producing tridecanal.
摘要:
A process for continuous preparation of filler-containing rubber powders including mixing a filler suspension and rubber latex in the liquid phase. The liquid mixture is passed through a tube, at least a coagulant is added to the tube and filler-containing rubber particles are precipitated. The liquid mixture is passed through at least one throttle position of variable throttle cross-section provided in the tube. The throttle cross-section is adjusted so that the drop in pressure in the liquid mixture achieved across the throttle position is greater than 0.5 bar.
摘要:
Finely divided powdered rubbers containing filler which remain free-flowing even after exposure to mechanical stresses and to a process for the production thereof, in which the rubber powder is obtained in two precipitation steps, and to the use of these powders for the production of vulcanizable rubber compounds. The fillers used, which are both precipitated silicas and carbon blacks known in the rubber art, are surface-modifed by organosilicon compounds.
摘要:
The invention relates to a process for the preparation of finely divided rubbers (rubber powders) by precipitation from aqueous mixtures, which comprise filler in the form of suspensions, water-soluble salts of a metal of groups IIa, IIb, IIIa and VIII of the periodic table of the elements arid a rubber latex (polymer latex), aqueous emulsions of a rubber or rubber solution, in which one or more organosilicon compound(s) containing at least one alkoxy group is or are dissolved or emulsified, optionally in the presence of a surface-active substance, in water, or the compounds mentioned are mixed directly, optionally with a surface-active substance, with an aqueous suspension of an oxidic or silicatic finely divided filler or a mixture of these fillers at a temperature of 10 to 60° C., preferably at room temperature, while stirring, the amount of this mixture envisaged for incoporation in the rubber, based on the filler content, in general being divided into two batches.
摘要:
The present invention relates to a VCSEL device comprising an optical gain medium (8) arranged between a first DBR (9) and a second DBR (7). The first and the second DBR form a laser cavity and are designed to allow self-contained lasing in the laser cavity, said second DBR (7) being partially transparent for laser radiation resonating in the laser cavity. An optical element is arranged on a side of the second DBR (7) outside of the laser cavity on the optical axis of the laser cavity. The optical element has a concave surface (5) facing the second DBR (7) and being designed to reflect a portion of laser radiation emitted through the second DBR (7) back into the laser cavity. The ratio R/d of the radius of curvature R of the concave surface (5) and the distance d between the concave surface (5) and the gain medium (8) is in the range between 1 and 2. With the proposed VCSEL device a high power output with an improved mode distribution and mode stabilization is achieved.
摘要:
An image-recording device for generating image spots (210) by n individually controllable light sources (12), which each have a distance si, i being=1 . . . n, to an object line (14), in a projection line (16) of the object line (14) on a printing form (28), which moves with a velocity component v normally to the direction defined by the projection line (16) and tangentially to the surface of the printing form. The image-recording device is distinguished by the triggering device (216) having an assigned time-delay device (222), which delays the tripping instant of the triggering device for each light source (12) as a function of the particular distance si. The image-recording device may advantageously by used in direct imaging print units or printing-form exposure units.
摘要:
A device for supplying radiant energy onto a printing substrate (14), including at least one radiant energy source (10) whose light (12) impinges on the printing substrate (14) on the path (16) of the printing substrate (14) through a printing press at a position (116) downstream of at least one printing nip (18) in a printing unit. The radiant energy source (10) emits light (12) having a peak-to-valley homogeneity of less than 15% in a direction transverse to the direction of the path (16) of the printing substrate (14).
摘要:
Rubber powders with a high degree of filling are obtained by precipitating water-containing suspensions which contain fillers and rubber emulsions or rubber solutions. Use thereof to prepare vulcanizable rubber mixtures.
摘要:
An individually drivable array of single stripe laser diodes is proposed for imaging printing plates. An imaging optics is used to produce n image points which have a spatial interval l between adjacent points. An interleaving raster scan line method is indicated, which, given proper selection of the increment, enables each dot to be exposed exactly once.