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AssigneeLurgi GmbH
InventorsHermann Bach, Lothar Brehm, Jürgen Bohle, Gunter Quass, Günther Heinz, Katja Bartels, Heinrich Dörr, Harald Kömpel
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The invention relates to a reactor for the production of C2 to C8 olefins from gaseous oxygenate and H2O and one or more material flows containing C2 C4, C5, C6, C7, C8 olefin and paraffin at 400° to 470° C., wherein several reaction stages which the material flow can pass through from the top to the bottom, each consisting of a support base with a catalyst layer situated on it, are arranged in a closed, upright container. In order to be able in each case to lower the temperature of the reaction mixture leaving the reaction stages before it enters into the next reaction stage, it is provided that each support base consists of cells which are placed closely next to each other with no gaps and which are securely attached to each other and filled with catalyst, and in the space formed by two neighboring reaction stages, respectively, an assembly of nozzle tubes is installed for spraying a liquid phase containing H2O and DME and/or MeOH, using a water-saturated gas phase containing mainly DME and/or MeOH, in the direction of the following reaction stage downstream.
Reactor for producing C2- to C8-olefins, preferably propylene, from gaseous oxygenate, preferably dimethylether (DME) and/or methanol (MeOH) as well as H2O and a material flow containing one or more of the hydrocarbons C2-, C4-, C5-, C6-, C7-, C8-olefins and -paraffins, having a temperature of 400 to 470° C., with several reaction stages, arranged within an enclosed, vertical vessel through which the material flow flows from top to bottom, in each case composed of a tray with a fixed-bed zone formed by a layer of granular molecular-sieve catalyst arranged on top of it, wherein each tray is build-up from cells, arranged side by side without interspace and firmly connected with each other and freely suspended inside the vessel, the cells being filled with a layer of molecular-sieve catalyst, an atomizer system in the interspace delimited upwards and downwards by two adjacent reaction stages and formed by an assembly of nozzle tubes for the uniform atomization of a liquid phase containing DME and/or MeOH, mainly consisting of H2O and having a temperature of between 25 and 150° C., by means of a water-saturated gas phase mainly containing DME and/or MeOH and having a temperature of 170 to 300° C., in the direction of the next following downstream reaction stage.
Process of operating the reactor for producing C2- to C8-olefins, preferably propylene, from gaseous oxygenate, preferably DME and/or MeOH as well as H2O and a material flow containing one or more of the hydrocarbons C2-, C4-, C5-, C6-, C7-, C8-olefins and -paraffins and having a temperature of 400 to 470° C., with several reactor stages arranged within an enclosed vertical vessel through which the material flow flows from top to bottom, in each case composed of a tray with a fixed-bed zone arranged on it, consisting of a layer of granular molecular-sieve catalyst where each tray is built up from firmly interconnected cells arranged side by side without interspace and freely suspended inside the vessel, those cells being filled with a layer of molecular-sieve catalyst, an atomizer system in the form an assembly of nozzle tubes is installed in the direction of the respectively next following downstream reaction stage, in the interspace delimited in each case above and below by two adjacent reactor stages, for uniform atomization of a liquid phase mainly containing H2O and having a temperature of 50 to 150° C. by means of a water-saturated gas phase mainly containing DME and/or MeOH and having a temperature of 170 to 300° C., wherein a gaseous oxygenate, preferably DME and MeOH as well as a feed stream containing H2O and having a temperature of 150 to 300° C. are cooled to a temperature of 100 to 150° C. and split into a liquid phase and a gas phase, the gas and liquid phases being separated into several partial streams the number of which corresponds in each case to the number of interspaces existing between the reaction stages, the individual gas phase partial stream being fed to a nozzle tube in each case with a liquid phase partial stream, with the liquid phase being sprayed into the corresponding interspace by means of the gas phase
Dependencies are inferred from the claim text.