Abstract:
The invention relates to a tube bundle reactor having a flat feed dome. Alternatively, the discharge dome can also be designed flat. The flat design reduces the reaction heat developing in the hood in reaction types that take place not only in the tube bundle (non-catalyzed reactions and reactions with homogenously distributed catalyst). Undesired reactions that already take place in the dome due to accumulated heat are thus heavily suppressed, whereby greater selectivity in temperature-sensitive reactions is achieved. Additionally, the temperature distribution within the domes can be precisely controlled. The tube bundle reactor comprises a tube bundle that has a feed end connected to a feed dome of the tube bundle reactor, wherein the feed dome is designed in a flat shape having a cross-sectional surface at the feed end and an inner volume, and the ratio of the inner volume to the cross-sectional surface is less than 0.35 m. The invention is furthermore implemented by a method for operating a tube bundle reactor, comprising: introducing a reactant mixture into a tube bundle and converting at least a portion of the reactant mixture into a product inside the tube bundle. The introduction step comprises: feeding the reactant mixture into an inner space of a feed dome of the tube bundle reactor and forwarding the reactant mixture into a feed end of the tube bundle in the form of a fluid flow. The fluid flow has a cross-sectional surface upon entering the feed end and the inner space of the feed dome through which the fluid flows has an inner volume; wherein the ratio of the inner volume to the cross-sectional surface is less than 0.35 m.
Abstract:
The present invention relates to a micropowder, wherein the particles of the micropowder have a Dv10 value of at least 2 micrometer and the micropowder comprises mesopores which have an average pore diameter in the range of from 2 to 50 nm and comprise, based on the weight of the micropowder, at least 95 weight-% of a microporous aluminum-free zeolitic material of structure type MWW containing titanium and zinc.
Abstract:
The present invention relates to a process for preparing at least one monocyclic ketone having 4 to 20 carbon atoms by reacting a mixture G1 comprising at least one monocyclic olefin having 4 to 20 carbon atoms with a mixture G2 comprising at least dinitrogen monoxide, this reaction being carried out adiabatically.
Abstract:
The present invention relates to a molding, comprising a microporous aluminum-free zeolitic material of structure type MWW containing titanium and zinc (ZnTiMWW), said molding preferably comprising a micropowder comprising, based on the weight of the micropowder, at least 95 weight-% of a microporous aluminum-free zeolitic material of structure type MWW containing titanium and zinc (ZnTiMWW), the molding preferably further comprising at least one binder, preferably a silica binder.
Abstract:
Regeneration of a Titanium Containing Zeolite The present invention relates to a process for the regeneration of a catalyst comprising a #" titanium-containing zeolite, said catalyst having been used in a process for the preparation of an olefin oxide and having phosphate deposited thereon, said process for the regeneration comprising the steps: (a) separating the reaction mixture from the catalyst, (b) washing the catalyst obtained from (a) with liquid aqueous system; (c) optionally drying the catalyst obtained from (b) in a gas stream comprising an inert gas at a temperature of less than °C; (d) $%" calcining the catalyst obtained from (c) in a gas stream comprising oxygen at a temperature of at least 300 °C. " " &'(")*+,-./0"1+2*304"
Abstract:
Un micropolvo, cuyas partículas tienen un valor de Dv10 de al menos 2 micrómetros, comprendiendo dicho micropolvo mesoporos que tienen un diámetro medio de poro (4V/A) en el intervalo de 2 a 50 nm determinado por porosimetría de Hg según DIN 66133, y que comprende, con base en el peso del micropolvo, por lo menos 95% en peso de un material zeolítico microporoso libre de aluminio de tipo MWW de estructura que contiene titanio y zinc (ZnTiMWW), donde el valor de Dv10 representa el tamaño medio de partícula donde el 10% en volumen de las partículas del micropolvo tienen un tamaño más pequeño.
Abstract:
The present invention relates to a molding, comprising a microporous aluminum-free zeolitic material of structure type MWW containing titanium and zinc (ZnTiMWW), said molding preferably comprising a micropowder comprising, based on the weight of the micropowder, at least 95 weight-% of a microporous aluminum-free zeolitic material of structure type MWW containing titanium and zinc (ZnTiMWW), the molding preferably further comprising at least one binder, preferably a silica binder.
Abstract:
The present invention relates to a process for the regeneration of a catalyst comprising a titanium-containing zeolite, said catalyst having been used in a process for the preparation of an olefin oxide and having phosphate deposited thereon, said process for the regeneration comprising the steps: (a) separating the reaction mixture from the catalyst, (b) washing the catalyst obtained from (a) with liquid aqueous system; (c) optionally drying the catalyst obtained from (b) in a gas stream comprising an inert gas at a temperature of less than 300° C.; (d) calcining the catalyst obtained from (c) in a gas stream comprising oxygen at a temperature of at least 300° C.