Abstract: The present invention relates to a method for preparing linear alpha-olefins (LAO) by oligomerization of ethylene in the presence of a solvent and homogeneous catalyst, comprising the steps of: (i) feeding ethylene, solvent and catalyst into an oligomerization reactor, (ii) oligomerizing the ethylene in the reactor, (iii) removing a reactor outlet stream comprising solvent, linear alpha-olefins, optionally unreacted ethylene and catalyst from the reactor via a reactor outlet piping system, (iv) dosing at least one additive selected from the group consisting of alcohols, poly-ethylene glycols, polyethylene glycol monoethers, polyethylene glycol diethers, polyamines, amines, amino alcohols and surfactants, (v) transferring the reactor outlet stre con the additive to a catalyst deactivation and removal section, and (vi) deactivating the catalyst with caustic and removing the deactivated catalyst from the reactor outlet stream, wherein the residence time of the additive in the reactor outlet stream prior to m

Abstract: The present invention relates to a method and a reactor system, for the oligomerization of ethylene, comprising oligomerizing ethylene in a reactor in the presence of a solvent and a catalyst composition to produce a liquid product stream comprising linear alpha-olefins, solvent and catalyst composition, and deactivating and extracting the catalyst composition in said liquid product stream by mixing it with a polar phase in a dynamic mixing device having rotor and stator elements comprising concentric tool rings.

Abstract: The present invention relates to a method for preparing linear alpha-olefins (LAO) by oligomerization of ethylene in the presence of solvent and homogenous catalyst, comprising the steps of: (i) feeding ethylene, solvent and catalyst into an oligomerization reactor, (ii) oligomerizing the ethylene in the reactor, (iii) removing a reactor outlet stream comprising solvent, linear alpha-olefins, ethylene, and catalyst from the reactor via a reactor outlet piping system, (iv) transferring the reactor outlet stream to a catalyst deactivation and removal step, and (v) deactivating and removing the catalyst from the reactor outlet stream, characterized in that at least one organic amine is added into the oligomerization reactor and/or into the reactor outlet piping system.

Abstract: A method is described for processing an olefin-containing product stream (1) that contains, besides ethylene and propylene, longer-chain olefins and compounds of hydrocarbons with oxygen (oxygenates). Such a product stream (I) can occur in particular in olefin synthesis from methanol. The product stream is dewatered in successive process steps, optionally compressed in several steps and dried. Then it is subjected to fractionation. For removal of the undesired oxygenates it is proposed that the oxygenates be washed out of the gaseous product stream after the compression steps and before the drying step in a column (12) with methanol.

Abstract: The invention relates to a method and a system for entering data (12-15) in a data processing system (1). In this case, the data (12-15) is entered in a number of steps (2-5), with a view being displayed at a step (2-5) in a display region (19) of a display means (6), with the entering and/or display taking place in subsequent steps (2-5) at least partially as a function of the data (12-15) entered in one or a number of preceding steps (2-5). To design the step-by-step entering of data in a more user friendly manner, it is proposed to simultaneously display the views (16-18) of a number of consecutive steps (2-5)in the display region (19).

Abstract: This invention is directed to a method of removing dimethyl ether from an olefin stream. The method includes distilling the olefin stream so that the dimethyl ether is separated out of the olefin stream with propane. The olefin stream can then be further distilled to provide a polymer grade ethylene stream and a polymer grade propylene stream, with each stream containing not greater than about 10 wppm dimethyl ether.

Abstract: A method and apparatus for treating a fraction consisting predominantly of hydrocarbons having at least six carbon atoms (C6+ fraction) as produced in a plant for catalytic splitting of hydrocarbon-containing feedstock, is disclosed. The C6+ fraction undergoes steam dealkylation, where two useable product materials benzene and hydrogen are produced.

Abstract: In a device (5) for the manufacture of a quartz glass crucible (2), one section (14, 15) of a wall (13) of the rotating quartz glass crucible (2) is heated at one time by means of at least two electrode arrangements (7, 8) distributed uniformly at the circumference of the quartz glass crucible (2) and generating a first and another electric arc. By providing several electrode arrangements (7, 8), the cooling-down phase of the sections (14, 15) until their reaching the subsequent heating zone (11, 12) can be shortened, and thus an undesirable high temperature difference of the wall (13) can be avoided. Moreover, the required thermal output of each individual electrode arrangement (7, 8) can be reduced, so that evaporation phenomena and connected bubble formation can be reduced. In addition to the higher quality that can be reached in this way, the duration of the manufacturing process is reduced.

Abstract: A method and apparatus for treating a fraction consisting predominantly of hydrocarbons having at least six carbon atoms (C6+ fraction) as produced in a plant for generating hydrocarbons from the steam reforming of hydrocarbon-containing feedstock, is disclosed. The C6+ fraction is conducted to steam dealkylation following hydration where the usable products benzene and hydrogen are produced.

Abstract: A method and apparatus for treating a fraction consisting predominantly of hydrocarbons having at least seven carbon atoms (C7+ fraction) as produced in a plant for catalytic reforming of hydrocarbon-containing feedstock, is disclosed. Following hydration, the C7+ fraction is taken to steam dealkylation where the useable products benzene and hydrogen are produced.

Abstract: A method and apparatus for treating a fraction consisting predominantly of hydrocarbons having at least seven carbon atoms (C7+ fraction) as produced in a plant for generating hydrocarbons from the steam reforming of hydrocarbon-containing starting material (olefin plant), is disclosed. The C7+ fraction is conducted to steam dealkylation following hydration where the useable products benzene and hydrogen are produced.

Abstract: A method and apparatus for treating a fraction consisting predominantly of hydrocarbons having at least seven carbon atoms (C7+ fraction) as produced in a plant for the catalytic splitting of hydrocarbon-containing feedstock, is disclosed. Following hydration, the C7+ fraction is taken to steam dealkylation where the usable products benzene and hydrogen are produced.

Abstract: A method and apparatus for treating a fraction consisting predominantly of hydrocarbons having at least six carbon atoms (C6+ fraction) as produced in a plant for the catalytic reforming of hydrocarbon-containing feedstock, is disclosed. The C6+ fraction is taken for steam dealkylation where the useable products benzene and hydrogen are produced.

Abstract: A method for processing an olefin-containing product stream that contains dimethyl ether as a by-product is described. Such a product stream arises, for example, in the synthesis of olefin from methanol. For separation of the dimethyl ether from the product stream, it is proposed that at least a partial stream chiefly containing C3 hydrocarbons is separated from the product stream by fractionation, and is sent to a rectification column (C3 splitter) (16) for separation of propylene and propane. The dimethyl ether goes together with the propane into the bottom of the rectification column in the rectification process and can be withdrawn (42). A substantially pure propylene product (41), which contains at most only traces of dimethyl ether, can be removed from the top of the rectification column.

Abstract: A method and a system for entering data (12-15) in a data processing system is provided. In this case, the data is entered in a number of steps, with a view being displayed at a step in a display region of a display means, with the entering and/or display taking place in subsequent steps at least partially as a function of the data entered in one or a number of preceding steps. To design the step-by-step entering of data in a more user friendly manner, it is proposed to simultaneously display the views of a number of consecutive steps in the display region.

Abstract: The mouse cursor is moved over the register of a register dialog once a drop-and-drag action has been initiated, then the register under the mouse cursor is automatically moved to the foreground after a variable time interval, and the contents can thus be seen. Process of making the item visible is initiated just by locating the mouse over the register of the concealed registered dialog. The invention can be extended to normal mouse movements (that is to say that other than drag drop.) Dropping an object on to a drop destination in a concealed register of a register dialog for drag and drop actions and drag and drop between the registers of a tabbed dialog or the pages of a workbook (such as the various tables in Excel, for example.

Abstract: This invention is directed to a method of removing dimethyl ether from an olefin stream. The method includes distilling the olefin stream so that the dimethyl ether is separated out of the olefin stream with propane. The olefin stream can then be further distilled to provide a polymer grade ethylene stream and a polymer grade propylene stream, with each stream containing not greater than about 10 wppm dimethyl ether.

Abstract: Permitting or prohibiting a drop is executed at the beginning of the drag-and-drop action initiated by the user, by mouse-clicking on the object to be dragged, for example. Thus, the drag-and-drop action is shown as a visual drop permission or prohibition in the relevant drop areas, such as a visual queue, for example, check mark, etc. In the preferred embodiment, and upon initiation of the action, the surface components display which areas, parts, elements or substructures can or cannot accept a given object or data element before a mouse pointer, arrow or cursor reaches or moves over the relevant areas, parts, elements or substructures.

Abstract: A method is described for processing an olefin-containing product stream (1) that contains, besides ethylene and propylene, longer-chain olefins and compounds of hydrocarbons with oxygen (oxygenates). Such a product stream (I) can occur in particular in olefin synthesis from methanol. The product stream is dewatered in successive process steps, optionally compressed in several steps and dried. Then it is subjected to fractionation. For removal of the undesired oxygenates it is proposed that the oxygenates be washed out of the gaseous product stream after the compression steps and before the drying step in a column (12) with methanol.

Abstract: A method for processing an olefin-containing product stream that contains dimethyl ether as a by-product is described. Such a product stream arises, for example, in the synthesis of olefin from methanol. For separation of the dimethyl ether from the product stream, it is proposed that at least a partial stream chiefly containing C3 hydrocarbons is separated from the product stream by fractionation, and is sent to a rectification column (C3 splitter) (16) for separation of propylene and propane. The dimethyl ether goes together with the propane into the bottom of the rectification column in the rectification process and can be withdrawn (42). A substantially pure propylene product (41), which contains at most only traces of dimethyl ether, can be removed from the top of the rectification column.