DE102017006910A1 - Device for decomposing the product stream of an alkane dehydrogenation - Google Patents
Device for decomposing the product stream of an alkane dehydrogenation Download PDFInfo
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- DE102017006910A1 DE102017006910A1 DE102017006910.7A DE102017006910A DE102017006910A1 DE 102017006910 A1 DE102017006910 A1 DE 102017006910A1 DE 102017006910 A DE102017006910 A DE 102017006910A DE 102017006910 A1 DE102017006910 A1 DE 102017006910A1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
- F25J3/0605—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the feed stream
- F25J3/062—Refinery gas, cracking gas, coke oven gas, gaseous mixtures containing aliphatic unsaturated CnHm or gaseous mixtures of undefined nature
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- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
- F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
- F25J3/0645—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of CnHm with 3 carbon atoms or more
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
- F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
- F25J3/065—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of CnHm with 4 carbon atoms or more
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
- F25J3/063—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream
- F25J3/0655—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation characterised by the separated product stream separation of hydrogen
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/06—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by partial condensation
- F25J3/0695—Start-up or control of the process; Details of the apparatus used
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- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/12—Refinery or petrochemical off-gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2210/00—Processes characterised by the type or other details of the feed stream
- F25J2210/62—Liquefied natural gas [LNG]; Natural gas liquids [NGL]; Liquefied petroleum gas [LPG]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2215/00—Processes characterised by the type or other details of the product stream
- F25J2215/02—Mixing or blending of fluids to yield a certain product
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- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2240/00—Processes or apparatus involving steps for expanding of process streams
- F25J2240/02—Expansion of a process fluid in a work-extracting turbine (i.e. isentropic expansion), e.g. of the feed stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2245/00—Processes or apparatus involving steps for recycling of process streams
- F25J2245/02—Recycle of a stream in general, e.g. a by-pass stream
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/12—External refrigeration with liquid vaporising loop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2270/00—Refrigeration techniques used
- F25J2270/90—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration
- F25J2270/904—External refrigeration, e.g. conventional closed-loop mechanical refrigeration unit using Freon or NH3, unspecified external refrigeration by liquid or gaseous cryogen in an open loop
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/40—Vertical layout or arrangement of cold equipments within in the cold box, e.g. columns, condensers, heat exchangers etc.
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/42—Modularity, pre-fabrication of modules, assembling and erection, horizontal layout, i.e. plot plan, and vertical arrangement of parts of the cryogenic unit, e.g. of the cold box
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
- F25J2290/62—Details of storing a fluid in a tank
Abstract
Die Erfindung betrifft eine Vorrichtung zur Erzeugung eines weitgehend aus einem Alkan und Wasserstoff bestehenden Einsatzes (1) für einen Dehydrier-Reaktor (R) sowie der Trennung des im Dehydrier-Reaktor (R) gasförmig anfallenden, Wasserstoff und ein Alken umfassenden Dehydrier-Produkts (2), mit wenigstes einem ersten (E1) und einem zweiten, in einer wärmeisolierenden Einhausung (Cold-Box) (K) angeordneten Wärmetauscher (E2) zur Abkühlung des Dehydrier-Produkts (2), wobei dem ersten Wärmetauscher (E1) ein erster (D1) und dem zweiten Wärmetauscher (E2) ein zweiter Abscheider (D2) zugeordnet ist und wobei im ersten Abscheider (D1) von einem durch die Abkühlung des Dehydrier-Produkts (2) im ersten Wärmetauscher (E1) erhältlichen ersten zweiphasigen Stoffstrom (3) ein erstes wasserstoffreiches, Alken enthaltendes Gasgemisch (5) abtrennbar ist, aus der im zweiten Wärmetauscher (E2) durch weitere Abkühlung ein zweiter zweiphasiger Stoffstrom (6) erhältlich ist, von dem im zweiten Abscheider (D2) ein zweites wasserstoffreiches, Alken enthaltendes Gasgemisch (8) abgetrennt werden kann. Kennzeichnend ist hierbei, dass der erste Abscheider (D1) außerhalb der Cold-Box (K) angeordnet ist. The invention relates to a device for producing an insert (1) consisting largely of an alkane and hydrogen for a dehydrogenation reactor (R) and separating the dehydrogenation product comprising hydrogen in the dehydrogenation reactor (R) and an alkene comprising 2), at least a first (E1) and a second, in a heat-insulating housing (cold box) (K) arranged heat exchanger (E2) for cooling the dehydrogenation product (2), wherein the first heat exchanger (E1) a first (D1) and the second heat exchanger (E2) is associated with a second separator (D2) and wherein in the first separator (D1) of a by the cooling of the dehydrogenation product (2) in the first heat exchanger (E1) available first two-phase material flow (3 ) a first hydrogen-rich, alkene-containing gas mixture (5) can be separated, from which in the second heat exchanger (E2) by further cooling, a second biphasic material flow (6) is available, from the second a separator (D2) a second hydrogen-rich, alkene-containing gas mixture (8) can be separated. Characteristic here is that the first separator (D1) outside the cold box (K) is arranged.
Description
Die Erfindung betrifft eine Vorrichtung zur Erzeugung eines weitgehend aus einem Alkan und Wasserstoff bestehenden Einsatzes für einen Dehydrier-Reaktor sowie der Trennung des im Dehydrier-Reaktor gasförmig anfallenden, Wasserstoff und ein Alken umfassenden Dehydrier-Produkts, mit wenigstens einem ersten und einem zweiten, in einer wärmeisolierenden Einhausung (Cold-Box) angeordneten Wärmetauscher zur Abkühlung des Dehydrier-Produkts, wobei dem ersten Wärmetauscher ein erster und dem zweiten Wärmetauscher ein zweiter Abscheider zugeordnet ist und wobei im ersten Abscheider von einem durch die Abkühlung des Dehydrier-Produkts im ersten Wärmetauscher erhältlichen ersten zweiphasigen Stoffstrom ein erstes wasserstoffreiches, Alken enthaltendes Gasgemisch abtrennbar ist, aus dem im zweiten Wärmetauscher durch weitere Abkühlung ein zweiter zweiphasiger Stoffstrom erhältlich ist, von dem im zweiten Abscheider ein zweites wasserstoffreiches, Alken enthaltendes Gasgemisch abgetrennt werden kann.The invention relates to a device for generating a substantially consisting of an alkane and hydrogen use for a dehydrogenation reactor and the separation of gaseous in the dehydrogenation reactor, hydrogen and an alkene comprising dehydrogenation product, with at least a first and a second, in a heat-insulating housing (cold-box) arranged heat exchanger for cooling the dehydrogenation product, wherein the first heat exchanger, a first and the second heat exchanger is associated with a second separator and wherein in the first separator available from a by the cooling of the dehydrogenation product in the first heat exchanger a first biphasic material flow, a first hydrogen-rich, alkene-containing gas mixture is separable from the second heat exchanger by further cooling a second biphasic material flow is available, from the second separator, a second hydrogen-rich, alkene-containing gas mixture nt can be.
Vorrichtungen der gattungsgemäßen Art werden beispielsweise im sog. Oleflex™-Prozess eingesetzt, der insbesondere zur Erzeugung von Propylen aus Propan bzw. von Butylen aus Butan verwendet wird. Die zur Durchführung des Prozesses dienende Einrichtung umfasst einen Dehydrier-Reaktor sowie eine kryogene Behandlungseinrichtung, deren Komponenten überwiegend in einer wärmeisolierenden Einhausung, der sog. Cold-Box, angeordnet sind. Im Dehydrier-Reaktor, dem ein das jeweilige Alkan sowie Wasserstoff enthaltender, als kombinierter Einsatz bezeichneter Stoffstrom zugeführt wird, wird das Alkan mit Hilfe eines geeigneten Katalysators zum Alken umgesetzt, wobei ein gasförmiges, Wasserstoff und das Alken enthaltendes Stoffgemisch, das Dehydrier-Produkt, entsteht. Das Dehydrier-Produkt wird in der kryogenen Behandlungseinrichtung in ein Wasserstoffprodukt und eine kohlenwasserstoffreiche, das erzeugte Alken umfassende Flüssigfraktion, das sog. Flüssigprodukt, zerlegt. Gleichzeitig dient die kryogene Behandlungseinrichtung dazu, aus einem im Wesentlichen aus dem jeweiligen Alkan bestehenden Flüssigeinsatz und einem Teil des aus dem Dehydrier-Produkt abgetrennten Wasserstoffs den kombinierten Einsatz für den Dehydrier-Reaktor mit einem vorgegebenen Verhältnis von Wasserstoff zu Kohlenwasserstoff zu erzeugen.Devices of the generic type are used for example in the so-called. Oleflex ™ process, which is used in particular for the production of propylene from propane or butylene from butane. The device used to carry out the process comprises a dehydrogenation reactor and a cryogenic treatment device whose components are predominantly arranged in a heat-insulating housing, the so-called cold box. In the dehydrogenation reactor, to which a stream containing the respective alkane and hydrogen, referred to as a combined feed, is introduced, the alkane is converted to the alkene with the aid of a suitable catalyst, a gaseous mixture comprising hydrogen and the alkene, the dehydrogenation product, arises. The dehydrogenation product is decomposed in the cryogenic treatment device into a hydrogen product and a hydrocarbon-rich liquid fraction comprising the produced alkene, the so-called liquid product. At the same time, the cryogenic treatment device serves to produce the combined feed for the dehydrogenation reactor with a predetermined ratio of hydrogen to hydrocarbon from a liquid feed consisting essentially of the respective alkane and a portion of the hydrogen separated from the dehydrogenation product.
In der Cold-Box befinden sich gewöhnlich drei Wärmetauscher sowie vier unterschiedlich große, unterhalb der Wärmetauscher angeordnete Abscheider, die zur optimalen Nutzung des zur Verfügung stehenden Raums als senkrecht stehende Zylinder ausgeführt sind, wobei die Höhe dieses Raumes durch die Länge des größten der Abscheider nach unten begrenzt ist. In einem ersten Wärmetauscher der Cold-Box wird das Dehydrier-Produkt gegen den zu verdampfenden kombinierten Einsatz abgekühlt und teilweise kondensiert. Das hierbei entstehende zweiphasige Stoffgemisch wird im größten Abscheider in eine erste alkenreiche, Wasserstoff enthaltende Flüssigphase und eine erste wasserstoffreiche, Alken enthaltende Gasphase getrennt, die im zweiten Wärmetauscher weiter abgekühlt wird, wobei ein zweites zweiphasiges Stoffgemisch entsteht. Im nächst kleineren Abscheider werden aus dem zweiten zweiphasigen Stoffgemisch eine zweite alkenreiche, Wasserstoff enthaltende Flüssigphase und eine zweite wasserstoffreiche, Alken enthaltende Gasphase erhalten, die zur Erzeugung von Prozesskälte in außerhalb der Cold-Box angeordneten Entspannungsmaschinen in zwei Schritten arbeitsleistend entspannt wird. Hierbei fallen ebenfalls zwei zweiphasigen Stoffgemische an, die in den zwei kleinsten Abscheidern getrennt werden, wobei zwei weitere wasserstoffreiche Gas- sowie alkenreiche Flüssigphasen entstehen.In the cold box are usually three heat exchangers and four differently sized, arranged below the heat exchanger separator, which are designed to make optimum use of the available space as a vertical cylinder, the height of this space by the length of the largest of the separator after is limited below. In a first heat exchanger of the cold box, the dehydrogenation product is cooled and partially condensed against the combined use to be evaporated. The resulting two-phase mixture is separated in the largest separator in a first alkene-rich, hydrogen-containing liquid phase and a first hydrogen-rich, alkene-containing gas phase, which is further cooled in the second heat exchanger, with a second biphasic mixture is formed. In the next smaller separator, a second alkene-rich, hydrogen-containing liquid phase and a second hydrogen-rich, alkene-containing gas phase are obtained from the second two-phase mixture, which is expanded to provide process refrigeration in outside the cold box arranged expansion machines in two steps to perform work. In this case, two two-phase mixtures are also obtained, which are separated in the two smallest separators, resulting in two more hydrogen-rich gas and alkene-rich liquid phases.
Sämtliche aus dem Dehydrier-Produkt abgetrennten Flüssigphasen werden entspannt und in einen außerhalb der Cold-Box angeordneten Sammelbehälter eingeleitet, aus dem eine Gas- sowie eine Flüssigfraktion abgezogen werden. Beide Fraktionen werden in die Cold-Box zurückgeführt, die sie nach Anwärmung gegen abzukühlende Verfahrensströme als Flashgas bzw. Flüssigprodukt wieder verlassen. Zur Rückführung der Flüssigfraktion wird eine Pumpe eingesetzt, die zur Gewährleistung einer ausreichenden Zulaufhöhe um 5 bis 10m tiefer als der Sammelbehälter positioniert ist.All separated from the dehydrogenation liquid phases are relaxed and introduced into a arranged outside the cold box collecting tank from which a gas and a liquid fraction are deducted. Both fractions are returned to the cold box, which they leave after warming against cooling process streams as flash gas or liquid product again. To recirculate the liquid fraction, a pump is used, which is positioned 5 to 10 meters lower than the sump to ensure sufficient inflow.
Die Cold-Box wird vormontiert transportiert und an ihrem Einsatzort aufgestellt. Aufgrund des hohen Gewichts und der großen Abmessungen der Cold-Box, die beispielsweise ca. 7×7×32m3 betragen können, ist hierfür ein beträchtlicher, mit hohen Kosten verbundener Aufwand erforderlich, der die Wirtschaftlichkeit der Alkan-Dehydrierung negativ beeinflusst.The cold box is transported pre-assembled and placed in its place of use. Due to the high weight and the large dimensions of the cold box, which may be, for example, about 7 × 7 × 32m 3 , this requires a considerable, high-cost effort that adversely affects the efficiency of the alkane dehydrogenation.
Aufgabe der vorliegenden Erfindung ist es daher, eine Vorrichtung der gattungsgemäßen Art anzugeben, die mit einem im Vergleich zum Stand der Technik geringeren Aufwand realisiert werden kann.Object of the present invention is therefore to provide a device of the generic type, which can be realized with a lower cost compared to the prior art.
Die gestellte Aufgabe wird dadurch gelöst, dass der erste Abscheider außerhalb der Cold-Box angeordnet ist.The stated object is achieved in that the first separator is arranged outside the cold box.
Durch die Erfindung kann die Cold-Box erheblich leichter als nach dem Stand der Technik gebaut werden, woraus alleine sich bereits Vorteile für Transport und Montage ergeben. Darüber hinaus ermöglicht es die Erfindung insbesondere dann, wenn sie im Oleflex™-Prozess eigesetzt werden soll, die Abmessungen der Cold-Box zu reduzieren, da die Höhe des für die Abscheider benötigten Raums unterhalb der Wärmetauscher durch die Länge des zweiten Abscheiders nach unten begrenzt ist, der um mehrere Meter kürzer als der erste sein kann.By the invention, the cold box can be built much easier than in the prior art, which alone results in benefits for transport and installation. In addition, especially if the invention is to be used in the Oleflex ™ process, the invention makes it possible to reduce the dimensions of the cold box the height of the space required for the separator below the heat exchanger is limited by the length of the second separator down, which may be several meters shorter than the first.
Die Anordnung des ersten Abscheiders außerhalb der wärmeisolierten Cold-Box ist weitgehend problemlos möglich, da er bei einer Temperatur betrieben wird, die zwar unterhalb von 0°C, jedoch deutlich über der Betriebstemperatur des zweiten Abscheiders liegt. Falls die erfindungsgemäße Vorrichtung zur Propan-Dehydrierung eingesetzt wird, liegt die Betriebstemperatur des ersten Abscheiders beispielsweise zwischen -30 und -50°C, während der zweite Abscheider bei bis zu -165°C betrieben wird. Um den Wärmeeintrag auf ein verfahrenstechnisch erforderliches Maß zu begrenzen, ist der erste Abscheider erfindungsgemäß mit einer Wärmeisolierung versehen.The arrangement of the first separator outside the thermally insulated cold box is largely problem-free, since it is operated at a temperature which is below 0 ° C, but significantly above the operating temperature of the second separator. If the inventive device for propane dehydrogenation is used, the operating temperature of the first separator, for example, between -30 and -50 ° C, while the second separator is operated at up to -165 ° C. In order to limit the heat input to a procedurally required level, the first separator according to the invention is provided with a thermal insulation.
Die Erfindung weiterbildend wird vorgeschlagen, den zweiten Abscheider als Zylinder mit horizontaler Achse auszuführen und innerhalb der Cold-Box anzuordnen. Der zweite Abscheider wird hierbei sinnvollerweise so ausgelegt, dass seine vertikale Erstreckung kleiner als die Länge eines als Zylinder mit vertikaler Achse ausgeführten zweiten Abscheiders ist, so dass die Höhe der Cold-Box weiter reduziert werden kann. Dies ist besonders dann vorteilhaft, wenn gleichzeitig der Querschnitt der Cold-Box im Vergleich zum Stand der Technik nicht vergrößert werden muss.Further developing the invention proposes to design the second separator as a cylinder with a horizontal axis and to arrange it inside the cold box. The second separator is usefully designed so that its vertical extent is smaller than the length of a cylinder designed as a vertical axis second separator, so that the height of the cold box can be further reduced. This is particularly advantageous if at the same time the cross-section of the cold box does not have to be increased in comparison to the prior art.
Eine weitere Ausgestaltung der Erfindung sieht vor, dass der erste Abscheider als Zylinder mit horizontaler Achse ausgeführt ist. Befinden sich außerhalb der Cold-Box ein Sammelbehälter zur Zwischenspeicherung einer Alken enthaltenden, aus der Cold-Box zuführbaren Flüssigphase sowie eine mehrere Meter unterhalb des Sammelbehälters platzierte Pumpe zur Rückführung der im Sammelbehälter erhältlichen Flüssigfraktion in die Cold-Box, wie dies beispielsweise bei einer im Oleflex™-Prozess einsetzbaren kryogenen Behandlungseinrichtung der Fall ist, sieht eine besonders bevorzugte Variante der Erfindung vor, dass der erste Abscheider als horizontaler Zylinder in dem nach dem Stand der Technik nicht oder nur sehr eingeschränkt genutzten Raum zwischen dem Sammelbehälter und der Pumpe angeordnet ist.A further embodiment of the invention provides that the first separator is designed as a cylinder with a horizontal axis. Are located outside the cold box a container for temporary storage of alkene-containing, from the cold box fed liquid phase and a several meters below the reservoir placed pump for returning the liquid fraction available in the collection container in the cold box, as for example in an im Oleflex ™ process employable cryogenic treatment device is the case, provides a particularly preferred variant of the invention that the first separator is arranged as a horizontal cylinder in the prior art not or only very limited space between the reservoir and the pump.
Durch die Erfindung werden erhebliche Erleichterungen bei Transport und Montage der Cold-Box erreicht, da die Cold-Box leichter sowie mit kleinerem Querschnitt und geringerer Höhe als im Stand der Technik gebaut werden kann. Zusätzlich reduziert sich durch die Anordnung des ersten Abscheiders zwischen Sammelbehälter und Pumpe der für die Vorrichtung benötigte Raum deutlich.The invention provides considerable relief during transport and installation of the cold box, since the cold box can be built lighter and with a smaller cross section and a lower height than in the prior art. In addition, reduced by the arrangement of the first separator between sump and pump the space required for the device significantly.
Im Folgenden soll die Erfindung anhand eines in der
In der
Über Leitung
Während die zweite kohlenwasserstoffreiche Flüssigphase
Um den kombinierten Einsatzstrom
Die beiden kohlenwasserstoffreichen Flüssigphasen
Claims (4)
Priority Applications (3)
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DE102017006910.7A DE102017006910A1 (en) | 2017-07-20 | 2017-07-20 | Device for decomposing the product stream of an alkane dehydrogenation |
PCT/EP2018/025195 WO2019015806A1 (en) | 2017-07-20 | 2018-07-13 | Device for disassembling the product stream of an alkane dhydrogenation |
TW107124904A TW201908678A (en) | 2017-07-20 | 2018-07-19 | Apparatus for fractionating the product stream of an alkane dehydrogenation |
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DE102019001497B3 (en) * | 2019-03-02 | 2020-03-05 | Messer Group Gmbh | Method and device for separating a gas mixture containing diborane and hydrogen |
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CN115127303A (en) * | 2018-10-09 | 2022-09-30 | 查特能源化工股份有限公司 | Dehydrogenation separation device and method with mixed refrigerant cooling |
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US2665565A (en) * | 1951-07-02 | 1954-01-12 | Asbury S Parks | Separator |
DE19644106C1 (en) * | 1996-10-31 | 1998-01-29 | Linde Ag | Efficient low temperature separation of dehydrogenated hydrocarbon(s) from hydrogen and methane |
FR2985198B1 (en) * | 2012-01-03 | 2015-05-15 | Air Liquide | ELEMENT OF A LOW TEMPERATURE DISTILLATION SEPARATION PLANT, INSTALLATION INCORPORATING SUCH ELEMENT AND METHOD OF SEPARATION IN SUCH A INSTALLATION |
PL2657633T3 (en) * | 2012-04-27 | 2020-04-30 | Linde Aktiengesellschaft | Tubing module for air separation unit |
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DE102019001497B3 (en) * | 2019-03-02 | 2020-03-05 | Messer Group Gmbh | Method and device for separating a gas mixture containing diborane and hydrogen |
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