EP3555040A1 - Procédé pour la préparation d'éthanolamines et/ou d'éthylénamines - Google Patents

Procédé pour la préparation d'éthanolamines et/ou d'éthylénamines

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Publication number
EP3555040A1
EP3555040A1 EP17809318.3A EP17809318A EP3555040A1 EP 3555040 A1 EP3555040 A1 EP 3555040A1 EP 17809318 A EP17809318 A EP 17809318A EP 3555040 A1 EP3555040 A1 EP 3555040A1
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EP
European Patent Office
Prior art keywords
catalyst
catalyst precursor
group
active
carrier material
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP17809318.3A
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German (de)
English (en)
Inventor
Marie Katrin Schroeter
Alvaro GORDILLO
Andrei-Nicolae PARVULESCU
Johann-Peter Melder
Carlos LIZANDARA
Juergen Bechtel
Thomas Heidemann
Stephan A Schunk
Ulrich Mueller
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BASF SE
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BASF SE
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Publication of EP3555040A1 publication Critical patent/EP3555040A1/fr
Withdrawn legal-status Critical Current

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    • C07C209/04—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups
    • C07C209/14—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups by substitution of hydroxy groups or of etherified or esterified hydroxy groups
    • C07C209/16—Preparation of compounds containing amino groups bound to a carbon skeleton by substitution of functional groups by amino groups by substitution of hydroxy groups or of etherified or esterified hydroxy groups with formation of amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings
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    • C07D295/04—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms
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    • C07D295/084—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly bound oxygen or sulfur atoms with the ring nitrogen atoms and the oxygen or sulfur atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings
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    • C07D295/12—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly or doubly bound nitrogen atoms
    • C07D295/125—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly or doubly bound nitrogen atoms with the ring nitrogen atoms and the substituent nitrogen atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings
    • C07D295/13—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms with substituted hydrocarbon radicals attached to ring nitrogen atoms substituted by singly or doubly bound nitrogen atoms with the ring nitrogen atoms and the substituent nitrogen atoms attached to the same carbon chain, which is not interrupted by carbocyclic rings to an acyclic saturated chain
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Definitions

  • the present invention relates to a process for the preparation of ethanolamines and / or ethyleneamines
  • EDA ethylenediamine
  • two methods are generally used.
  • EDA can be prepared by reacting 1, 2 dichloroethane with ammonia with elimination of HCl (EDC method).
  • EDC method Another large-scale process for the preparation of EDA is the reaction of monoethanolamine (MEA) with ammonia in the presence of amination catalysts (MEA process).
  • EDA monoethylene glycol
  • MEA is produced industrially by reacting ethylene oxide (EO) and ammonia.
  • EO ethylene oxide
  • ammonia As a rule, a reaction mixture is formed which, in addition to MEA, also contains higher ethanolamines, such as diethanolamine (DEOA) and triethanolamine (TEOA).
  • DEOA diethanolamine
  • TEOA triethanolamine
  • Ethylene oxide is a highly flammable gas which can form explosive mixtures with air.
  • the handling of EO is correspondingly expensive.
  • the production of MEA thus requires a technically complex EO plant with subsequent purifying distillation.
  • MEG can be produced both on the basis of petrochemical raw materials and on the basis of renewable raw materials.
  • Petrochemically MEG is also produced from EO by reaction with water. As with the reaction of EO with ammonia, it can not be prevented when reacting EO with water that already formed MEG can react with EO to form by-products, such as di- and triethylene glycol.
  • the selectivity of MEG is about 90% and is thus significantly higher than the selectivity of MEA, which is usually 70-80%.
  • Schell's omega process significantly increased the selectivity for MEG to approximately 99%. In the omega-process, EO is converted with CO2 into ethylene carbonate, which is selectively hydrolyzed to MEG in the second step.
  • MEG can also be synthesized via the synthesis gas route, e.g. by oxidative carbonylation of methanol to dimethyloxalate and its subsequent hydrogenation.
  • synthesis gas route e.g. by oxidative carbonylation of methanol to dimethyloxalate and its subsequent hydrogenation.
  • natural gas is also suitable for the production of MEG.
  • MEG may also be made from renewable resources such as corn or sugarcane by fermentation to ethanol, followed by dehydration to ethene and subsequent reaction with oxygen to produce ethylene oxide. Due to the many production variants, the availability of MEG is generally high, which generally has a positive effect on the raw material costs.
  • US 4,111,840 discloses the reaction of MEG with ammonia and hydrogen at pressures of 500 to 5000 psig (about 34 to 340 bar) on supported Ni / Re catalysts.
  • Silica / alumina supported catalysts with a surface area of 60 m 2 / g gave better results than silica / alumina supported catalysts with a specific surface area of 150 m 2 / g.
  • No. 3,137,730 discloses the reaction of MEG with ammonia in the liquid phase at temperatures of 200-300 ° C. and pressures above 1000 psig (about 69 bar) of Cu / Ni catalysts.
  • DE 1 172 268 discloses the reaction of ethylene glycol with catalysts containing at least one of the metals Cu, Ag, Mn, Fe, Ni and Co.
  • MEG was used with Am- reacted at 180 ° C and a pressure of 300 bar in the presence of hydrogen on a co-catalyst.
  • WO 2007/093514 discloses a two-stage process for the preparation of EDA, in which in the first process stage the amination is carried out on a hydroamination catalyst up to a maximum MEA conversion of 40% and in the second process stage a supported Ru / Co -Catalyst shaped body is used with a small geometry and the second stage is carried out at a temperature at least 10 ° C higher temperature than the first process stage.
  • the reaction of MEG with ammonia and hydrogen can also take place in the gas phase.
  • Advantages of the gas phase reaction over the reaction in the liquid phase is that the reaction can be carried out at lower reaction pressures. This can lead to a reduction of investment costs.
  • CN 102 190 588 discloses the single-stage reaction of MEG and ammonia in the presence of Cu-containing catalysts.
  • the reaction pressure is according to the description in a range of 3 to 30 bar.
  • the reaction temperature is in the range of 150 to 350 ° C.
  • the reaction of MEG with ammonia in the gas phase is disclosed on catalysts comprising Cu and Ni as main components and Zr, Zn, Al, Ti, Mn and Ce as a minor component.
  • the composition of the resulting reaction mixtures was not disclosed.
  • the object of the present invention was to develop a heterogeneous catalyst for the amination of MEG in the gas phase, which shows sufficient activity and selectivity in the reaction of MEG to MEA and / or EDA.
  • the formation of value products i. such ethanolamines or ethyleneamines having a high commercial importance, in particular MEA and EDA
  • the formation of cyclic ethylene amines, in particular PIP, and higher ethanolamines, in particular AEEA are kept low since the commercial demand for PIP or AEEA is lower is as for EDA and MEA.
  • the object of the present invention was achieved by a
  • Process for the preparation of ethanolamines and / or ethyleneamines in the gas phase by reacting ethylene glycol with ammonia in the presence of an amination catalyst which is prepared by reduction of a calcined catalyst precursor which is an active ve mass comprises, wherein the active mass one or more active metals selected from the group consisting of the elements of groups 8, 9, 10 and 1 1 of the Periodic Table of the Elements and optionally one or more catalyst addition elements selected group consisting of the metals and semi-metals of the groups 3 to 7 and 12 to 17, the element P and the rare earth elements, characterized in that the catalyst precursor is prepared by mixed precipitation and the active composition additionally contains one or more basic elements selected from the group consisting of the alkali metals and alkaline earth metals; or the catalyst precursor contains in addition to the active material in addition a support material and is prepared by impregnation of the support material or precipitation on the support material and the support material one or more basic elements selected from the group consisting of the alkali metals, Be, Ca, Ba and S
  • AEEA aminoethylethanolamine
  • PEHA pentaethylenehexamine
  • TETA triethylenetetramine-terminating catalysts
  • amination catalysts are used, which are prepared by reduction of calcined catalyst precursors. acidity:
  • the catalyst precursors particularly preferably have an acidity of 0.1 mmol NH 3 / g and less, and very particularly preferably an acidity of 0.04 mmol Nh / g and less.
  • amination catalysts obtained by reduction of catalyst precursors having acidity in the preferred range have high selectivity for the linear amination products MEA and EDA, while the selectivity for the cyclic amination product PIP and the higher ethanolamine AEEA is low ,
  • a measure of this effect is the selectivity ratio SQ, which is the ratio of the sum of the selectivities of MEA and EDA and the sum of the selectivities of PIP and AEEA.
  • amination catalysts obtained by reduction of amination catalysts having acidity in the preferred range form less undesirable by-products.
  • Undesirable by-products are, for example, gaseous decomposition products or insoluble or sparingly soluble oligomers and polymers based on MEA and EDA.
  • the formation of both types of by-products leads to a reduction in carbon balance and thus to a reduction in the economics of the process.
  • the formation of poorly soluble or insoluble by-products can lead to deposition on the amination catalysts, which reduces the activity of the amination catalysts.
  • the measurement of the acidity of the catalyst precursors takes place after the last calcination step and before a subsequent optional shaping step
  • the measurement of acidity is done by temperature programmed desorption (TPD).
  • TPD temperature programmed desorption
  • the TPD is an experiment in which the transient, temperature-dependent desorption rate of ammonia is monitored from the catalyst surface and plotted as a function of temperature (desorption curve).
  • the area under the desorption curve represents the amount of ammonia bound on the catalyst precursor by acidic sites on the surface. This is normalized to the weighed amount of catalyst precursor.
  • the TPD measurement takes place in a flow apparatus, which preferably consists of glass. Generally, between 10 and 500 mg of the catalyst precursor is charged to the flow apparatus.
  • the catalyst precursor Prior to the actual TPD test, the catalyst precursor is heated in an inert gas stream (He) to 50 ° C for 2 hours to remove residual moisture and volatile contaminants. Subsequently, an inert gas stream with a volume fraction of 10 vol.% Ammonia in He is passed over the catalyst precursor in order to saturate the surface of the catalyst with ammonia. The passing of ammonia is usually for about 2 hours at a temperature of 50 ° C. Thereafter, the Katalysatorvorläu- fer is rinsed again for 3 hours at a temperature of 50 ° C with pure inert gas to remove unbound ammonia. Following rinsing, the catalyst precursor is heated from 50 ° C to 650 ° C at a rate of 5K / min.
  • He inert gas stream
  • an inert gas He
  • Desorbed ammonia is discharged through the inert gas stream and quantitatively detected with a mass spectrometer and recorded as a function of temperature as a desorption curve.
  • a suitable apparatus for carrying out the TPD is, for example, the Autochem II 2920 from Micromeritics GmbH.
  • the preferred acidity of the catalyst precursors can be achieved according to the invention by a) preparing the catalyst precursor by mixed precipitation and additionally comprising one or more basic elements selected from the group consisting of the alkali metals and alkaline earth metals (embodiment a)).
  • the catalyst precursor additionally contains a carrier material in addition to the active material and is prepared by impregnation of the carrier material or precipitation onto the carrier material and the carrier material one or more basic elements selected from the group consisting of the alkali metals, Be, Ca, Ba and Sr or contains one or more minerals selected from the group consisting of hydrotalcite, chrysotile and sepiolite (embodiment b)); or c) the catalyst precursor additionally contains a support material in addition to the active material and is prepared by impregnation of the support material or precipitation onto the support material and the active mass of the catalyst support one or more basic elements selected from the group consisting of the alkali metals and the alkaline earth metals (embodiment c)); d) the catalyst precursor is calcined at temperatures of 600 ° C and more (embodiment d)); or e) the catalyst precursor is prepared by a combination of variants a) and d) or by a combination of variants
  • composition of the catalyst precursors depends on the preparation method described below (mixed precipitation or precipitation) and the corresponding embodiment according to the invention.
  • the catalyst precursor in which the catalyst precursor is prepared by Mischbib- ment, contains the catalyst precursor after calcination an active material, the
  • one or more active metals selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the Periodic Table of the Elements;
  • one or more basic elements selected from the group consisting of the alkali metals and alkaline earth metals;
  • the catalyst precursor contains no support material. If the precipitation takes place in the presence of a carrier material, as described below, the precipitation in the context of the present invention is referred to as precipitation.
  • the catalyst precursor after calcination contains a support material comprising at least one or more basic elements selected from the group consisting of the alkali metals, Be, Ca, Ba and Sr contains, as well
  • one or more active metals selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the Periodic Table of the Elements;
  • the catalyst precursor contains a support material after calcination; such as
  • one or more active metals selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the Periodic Table of the Elements;
  • one or more basic elements selected from the group consisting of the alkali metals and alkaline earth metals;
  • the catalyst precursor contains a
  • one or more active metals selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the Periodic Table of the Elements;
  • the catalyst precursor contains
  • a carrier material optionally containing one or more basic elements; and an active mass, the
  • one or more active metals selected from the group consisting of the elements of Groups 8, 9, 10 and 11 of the Periodic Table of the Elements;
  • composition of the catalyst precursors and the support materials can be measured by known methods of elemental analysis, for example atomic absorption spectrometry (AAS), atomic emission spectrometry (AES), X-ray fluorescence analysis (RFA) or ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry).
  • AS atomic absorption spectrometry
  • AES atomic emission spectrometry
  • RFA X-ray fluorescence analysis
  • ICP-OES Inductively Coupled Plasma Optical Emission Spectrometry
  • the determination of the composition of the catalyst precursor takes place after the last calcination step and before an optional shaping step to form a shaped catalyst body.
  • Catalytically active metals / catalytically active components
  • the catalyst precursor contains, independently of the preparation method and the embodiment, one or more active metals selected from the group 8, 9, 10 and 11 of the Periodic Table.
  • the catalyst precursor contains one or more active metals selected from the group consisting of Fe, Ru, Co, Rh, Ni, Pd, Pt, Ag, and Cu.
  • the catalyst precursor contains one or more active metals selected from the group consisting of Co, Ni, Ag and Cu.
  • the catalyst precursor contains the active metal Cu.
  • the active metals after calcination are generally in the form of the oxygen-containing compounds of the abovementioned active metals, for example as carbonates, oxides, mixed oxides or hydroxides of the active metals, for example as CoO, NiO, CuO and / or their mixed oxides.
  • oxygen-containing compounds of the active metals obtained after the calcination such as the carbonates, oxides, mixed oxides or hydroxides of the active metals, are referred to below as catalytically active components.
  • the catalytically active components are usually formed by soluble compounds of the active metals or precipitated precipitates of the active metals are at least partially converted by a calcination in the catalytically active components, wherein the conversion is usually carried out by dehydration and / or decomposition.
  • catalytically active components is used for the abovementioned oxygen-containing metal compounds, but is not intended to imply that these oxygen-containing compounds are in themselves already catalytically active.
  • the catalytically active components have a catalytic activity in the reaction according to the invention only after the reduction has taken place.
  • the catalyst precursors may contain one or more active metals in the active composition.
  • the catalyst precursor preferably contains 1 to 3, particularly preferably 1 to 2 and particularly preferably 1 active metal (s).
  • the total amount of the active metals is preferably in the range of 1 to 80% by weight, more preferably in the range of 2; From 5 to 60% by weight and very particularly preferably in the range from 5 to 50% by weight of active metals, based on the total mass of the catalyst precursor.
  • the total amount of the active metals is preferably in the range of 1 to 80% by weight, preferably 2.5 to 60 wt .-% and particularly preferably in the range of 5 to 50 wt .-%, based on the total mass of the catalyst precursor.
  • the active composition may optionally include one or more additional catalyst additions in addition to the active metals.
  • the catalyst addition elements are metals or semimetals selected from Groups 3 to 7 and 12 to 17 of the Periodic Table, the element P and the metals of the rare earths.
  • the catalyst addition elements are generally present in the form of their oxygen-containing compounds, for example as carbonates, oxides, mixed oxides or hydroxides of the catalyst addition elements. Carbonates, oxides, mixed oxides or hydroxides of the catalyst addition elements are referred to below as catalyst additives.
  • the catalyst additives are converted from soluble compounds of the catalyst addition elements or precipitated precipitates of the catalyst addition elements into the catalyst additives by calination, the conversion generally taking place by dehydration and / or decomposition.
  • Preferred catalyst addition elements are Zr, Zn, Ce, La, Y, Mn and Ti.
  • Very particular preferred catalyst additive elements are Y, Ce, La, Ti, Zr and Zn.
  • the catalyst precursors may contain one or more catalyst additives in the active composition.
  • the catalyst precursor contains 1 to 4, particularly preferably 1 to 3 and particularly preferably 1 to 2 catalyst addition elements.
  • the total amount of catalyst addition elements is preferably in the range from 1 to 80% by weight, more preferably in the range of 2; From 5 to 60% by weight and most preferably in the range from 5 to 50% by weight of catalyst addition elements, based on the total mass of the catalyst precursor.
  • the total amount of catalyst additives is preferably in the range from 1 to 80% by weight, preferably 2, 5 to 60 wt .-% and particularly preferably in the range of 5 to 50 wt .-%, based on the total mass of the catalyst precursor.
  • the active composition additionally contains one or more basic elements selected from the group of alkali metals and alkaline earth metals.
  • catalyst precursors containing at least one basic element selected from the group of alkali metals and alkaline earth metals in the active composition have a lower acidity and show the above-mentioned advantages in the amination of MEG.
  • the active material of the catalyst precursor contains one or more basic elements selected from the group consisting of Li, Na, K, Rb, Mg, Ca and Ba.
  • the active material of the catalyst precursor contains one or more basic elements selected from the group consisting of,, K, Mg, Ca, Cs and Ba.
  • the active material of the catalyst precursor contains the element Ca.
  • these basic elements are present after calcination usually in the form of their oxygen-containing compounds, such as their oxides, mixed oxides or carbonates.
  • oxygen-containing compounds of the basic elements obtained after the calcination will be referred to as basic components.
  • the catalyst precursors may contain one or more basic elements in the active composition.
  • the catalyst precursor contains 1 to 3, more preferably 1 to 2, and most preferably 1 basic element (s) in the active composition.
  • the total amount of the basic element is preferably in the range of 1 to 80% by weight, more preferably in the range of From 2.5 to 60% by weight and most preferably in the range of from 5 to 50% by weight of basic elements, based on the total mass of the catalyst precursor.
  • the total amount of the basic element is preferably in the range of 1 to 80% by weight, more preferably Range of from 2.5 to 60% by weight and most preferably in the range of from 15 to 50% by weight of basic elements, based on the total mass of the catalyst precursor
  • the catalyst precursor comprises one or more support materials in addition to the active material.
  • the support materials are a solid, usually a solid with a high surface area.
  • the active material can be applied to the support material, for example by precipitation of sparingly soluble precursors of the catalytically active components or by precipitation of poorly soluble precursors of the catalyst additives or by precipitation of sparingly soluble precursors of the basic components or by impregnation of the support material with soluble compounds Active metals or the catalyst additives or basic elements.
  • catalyst supports are oxides of the catalyst addition elements Al, Ti, Zn, Zr and Si or mixtures thereof, for example aluminum oxide (gamma, delta, theta, alpha, kappa, chi or mixtures thereof), titanium dioxide (anatase, rutile, brookite or mixtures thereof) , Zinc oxide, zirconia, silica (such as silica, fumed silica, silica or silicates), aluminosilicates, minerals such as hydrotalcite, chrysotile and sepiolite.
  • aluminum oxide gamma, delta, theta, alpha, kappa, chi or mixtures thereof
  • titanium dioxide anatase, rutile, brookite or mixtures thereof
  • Zinc oxide zirconia
  • silica such as silica, fumed silica, silica or silicates
  • aluminosilicates such as hydrotalcite, chrysotile and sepiolite
  • the total content of carrier material based on the total mass of the catalyst precursor in the range of 30 to 99 wt .-%, preferably 40 to 95 wt .-% and particularly preferably in the range of 50 to 90 wt .-%.
  • the carrier material contains one or more basic elements selected from the groups consisting of the alkali metals, Be, Ca, Sr and Ba, or one or more minerals selected from the group consisting of hydrotalcite, chrysotile and sepiolite.
  • the support material particularly preferably contains one or more basic elements selected from the group consisting of Na, K and Ca.
  • the carrier material contains the element Ca.
  • the support material usually contains 1 to 3, preferably 1 to 2, more preferably 1 basic element (s).
  • the content of basic elements in the support material is in the range from 1 to 50% by weight, preferably 2 to 40% by weight and more preferably in the range from 2.5 to 20% by weight.
  • the basic elements in the support material are usually present in the form of their oxides or mixed oxides or carbonates.
  • Preferred basic support materials are mixed precipitated metal oxides of Zn and Ca, for example those containing 30-70 wt% ZnO and 30-70 wt% CaO.
  • the support material containing one or more basic elements selected from the groups consisting of the alkali metal, Be, Ca, Sr and Ba or one or more minerals selected from the group consisting of hydrotalcite, chrysotile and sepiolite contains, no MgO.
  • Preferred Compositions Most particularly preferred catalyst precursors are prepared by mixed precipitation and contain the active metal Cu.
  • Very particularly preferred catalyst precursors are prepared by mixed precipitation and contain the active metal Cu and at least one of the catalyst additives Zr and Zn, in particular those catalyst precursors are preferred which 1 to 80 wt .-% Cu, 2 to 60 wt .-% Zn and 0.1 contain up to 10 wt .-% Zr, each based on the total mass of the catalyst precursor.
  • Very particularly preferred catalyst precursors are prepared by mixed precipitation and contain the active metal Cu and the basic element Ca, in particular those catalyst precursors which contain 2.5 to 60% by weight of Cu and 5 to 50% by weight of Ca, in each case based on the total mass of the catalyst precursor.
  • Very particularly preferred catalyst precursors are prepared by mixed precipitation and contain the active metal Cu and at least one of the catalyst additives Zr and Zn and the basic element Ca, in particular those Kalysatorvor organizerr containing 1 to 20 wt .-% Cu, 20 to 60 wt .-% Zn, 0.1 to 10 wt .-% Zr and 10 to 40 wt .-% Ca, in each case based on the total mass of the catalyst precursor.
  • catalyst precursors are prepared by precipitation or impregnation and contain the active metal Cu, in particular those catalyst precursors which contain 40 to 95% by weight of carrier material, such as aluminum oxide or silica, and 5 to 60% by weight of Cu, in each case based on the total mass of the catalyst precursor.
  • carrier material such as aluminum oxide or silica
  • catalyst precursors are prepared by precipitation or impregnation and contain the active metal Cu and at least one of the additional elements Zn and Zr, in particular those catalyst precursors which are preferred
  • carrier material such as alumina or silica
  • carrier material such as alumina or silica
  • 2.5 to 80 wt .-% Cu and 2.5 to 40 wt .-% Zn and / or 1 to 20 wt .-% Zr contain, respectively based on the total mass of the catalyst precursor.
  • catalyst precursors are prepared by precipitation or impregnation and contain the active metal Cu and a support material which contains one or more basic elements.
  • those catalyst precursors are preferable which contain as carrier material a mixed oxide of CaO and ZnO (CaO / ZnO), wherein the content of the mixed oxide is preferably 40 to 95% by weight based on the total mass of the catalyst precursor and the mixed oxide preferably consists of 30-70 wt .-% CaO and 30 to 70 wt .-% ZnO.
  • catalyst precursors are prepared by precipitation or impregnation and contain the active metal Cu and at least one of the additional elements Zn and Zr and a basic support material, in particular those catalyst precursors which are 40 to 95 wt .-%, based on the total mass of the catalyst precursor of the above said mixed oxide of 30 to 70 wt .-% CaO and 30 to 70 wt% ZnO included.
  • those catalyst precursors are preferred whose elemental composition is 1 to 20% by weight of Cu, 20 to 60% by weight of Zn, 0.1 to 10% by weight of Zr and 10 to 60% by weight of Ca, in each case based on the total mass of the catalyst precursor.
  • catalyst precursors are prepared by precipitation or impregnation and contain the active metal Cu and at least one basic element in the active composition, in particular those catalyst precursors are preferred, the 50 to 90 wt .-% support material such as alumina or silica, and 2.5 to 70% by weight of Cu and 10 to
  • catalyst precursors are prepared by precipitation or impregnation and contain the active metal Cu and at least one of the additional elements Zn and Zr and at least one basic element in the active composition, in particular those catalyst precursors are preferred which 2.5 to 60 wt .-% Cu , 2.5 to 60 wt.% Zn and / or 0.1 to 10 wt.% Zr and 2.5 to 60 wt.% Ca, in each case based on the total mass of the catalyst precursor.
  • catalyst precursors are prepared by precipitation or impregnation and contain the active metal Cu and at least one of the additional elements Zn and Zr and a basic support material and at least one basic element in the active
  • those catalyst precursors are preferred which contain 2.5 to 60% by weight of Cu, 2.5 to 60% by weight of Zn and / or 0.1 to 10% by weight of Zr and 2.5 to 60% by weight.
  • % Ca in each case based on the total mass of the catalyst precursor.
  • the catalyst precursors may be prepared by known methods, e.g. by precipitation reactions (e.g., co-precipitation or precipitation) or impregnation.
  • Catalyst precursors can be prepared by a co-precipitation of all their components.
  • the liquid used is usually water.
  • a soluble compound of the active metals are usually the corresponding metal salts, such as the nitrates, chlorides, sulfates, carboxylates, in particular the acetates, or nitrates, the above-mentioned metals into consideration.
  • soluble compounds of the catalyst additives are generally water-soluble compounds of the catalyst additives, for example, the water-soluble nitrates, chlorides, sulfates, carboxylates, in particular the acetates or nitrates used.
  • Water-soluble compounds of the basic elements for example the water-soluble nitrates, sulfates, carboxylates, in particular the acetates or nitrates, are generally used as soluble compounds of the basic elements.
  • Catalyst precursors can be further prepared by precipitation.
  • Precipitation is understood as meaning a preparation method in which one or more support materials are suspended in a liquid and subsequently soluble compounds of the active metals, such as soluble metal salts of the active metals, and optionally soluble compounds of the catalyst addition elements are added, which are then added to the catalyst by addition of a precipitant suspended carrier (eg described in EP-A2-1 106 600, page 4, and AB Stiles, Catalyst Manufacture, Marcel Dekker, Inc., 1983, page 15).
  • a precipitant suspended carrier eg described in EP-A2-1 106 600, page 4, and AB Stiles, Catalyst Manufacture, Marcel Dekker, Inc., 1983, page 15).
  • Water-soluble compounds of the active metals, catalyst additives and basic elements for example the water-soluble nitrates, chlorides, sulfates, carboxylates, in particular the acetates or nitrates, are generally used as soluble compounds of the active metals, catalyst addition elements and basic elements.
  • the carrier material is usually present as a powder or grit.
  • the size of the particles is generally in the range of 50 to 2000 ⁇ , preferably 100 to 1000 ⁇ and particularly preferably 300 to 700 ⁇ .
  • the carrier material can already be present as a shaped body (as described below). If the carrier material is in the form of a shaped body, the carrier material preferably has one of the geometries described below.
  • water As a liquid in which the carrier material is suspended, water is usually used.
  • Precipitation Reactions - General In the case of the precipitation reactions, the soluble compounds are usually precipitated by addition of a precipitant as sparingly soluble or insoluble basic salts.
  • the precipitants used are preferably bases, in particular mineral bases, such as alkali metal bases.
  • bases in particular mineral bases, such as alkali metal bases.
  • precipitants are sodium carbonate, sodium hydroxide, potassium carbonate or potassium hydroxide.
  • ammonium salts for example ammonium halides, ammonium carbonate, ammonium hydroxide or ammonium carboxylates.
  • the precipitation reactions can be carried out, for example, at temperatures of from 20 to 100.degree. C., especially from 30 to 90.degree. C., in particular from 50 to 70.degree.
  • the precipitates obtained in the precipitation reactions are generally chemically ununiform and generally contain mixtures of the oxides, hydrated oxides, hydroxides, carbonates and / or bicarbonates of the metals or semimetals used. It may prove beneficial for the filterability of the precipitates when they are aged, i. if left for some time after precipitation, possibly in heat or by passing air through it.
  • the catalyst precursors can also be prepared by impregnation of support materials with soluble compounds of the active metals, catalyst addition elements and basic elements (impregnation or impregnation).
  • carrier materials used in the impregnation can be used, for example, in the form of powders or shaped articles, such as strands, tablets, spheres or rings.
  • suitable carrier material is preferably by
  • the impregnation of the abovementioned support materials can be carried out by conventional methods (A.B. Stiles, Catalyst Manufacture - Laboratory and Commercial Preparations, Marcel Dekker, New York, 1983), for example by applying a salt of the active metals or catalyst addition elements in one or more impregnation stages.
  • Suitable salts of the active metals, the catalyst addition elements and the basic elements are generally water-soluble salts, such as the carbonates, nitrates, carboxylates, in particular the nitrates, acetates or chlorides of the corresponding active metals, catalyst addition elements and basic elements, which are usually under at least partially convert the conditions of calcination into the corresponding oxides or mixed oxides.
  • the impregnation can also be carried out by the so-called "incipient wetness method", in which the support material is moistened to the maximum saturation with the impregnation solution in accordance with its water absorption capacity.
  • the impregnation can also be done in supernatant solution.
  • the impregnation can be carried out simultaneously with all salts or in any order of the individual salts in succession.
  • the impregnated catalyst precursors obtained by these impregnation processes or the precipitates obtained by the precipitation processes are usually processed by washing them from the liquid in which the impregnation or precipitation was carried out, washing, drying, calcining and optionally conditioning and a shaping process be subjected.
  • the impregnated catalyst precursors or the precipitates obtained after the precipitation processes are usually separated from the liquid in which the preparation of the catalyst precursors was carried out and washed.
  • the washing liquid used is generally a liquid in which the separated catalyst precursor is poorly soluble, but which is a good solvent for impurities adhering to the catalyst, for example precipitants.
  • a preferred washing liquid is water.
  • the separation is usually done with frame filter presses.
  • the washing of the filter residue with washing liquid can in this case be carried out by passing the washing liquid in the counterflow direction to the filtration direction.
  • the separation is usually carried out with rotary drum vacuum filters. Washing of the filter residue is usually carried out by spraying the filter residue with the washing liquid.
  • the separation of the catalyst precursor can also be done by centrifugation.
  • the washing is done by adding washing liquid during centrifugation. dry
  • the separated catalyst precursor is usually dried.
  • Processes for drying the catalyst precursors are known, for example, from the article "Heterogeneous Catalysis and Solid Catalysts, 2nd Development and Types of Solid Catalysts" in Ullmann's Encyclopedia of Industrial Chemistry (DOI: 10.1002 / 14356007.o05_o02).
  • the drying takes place at temperatures in the range of preferably 60 to 200 ° C, in particular from 80 to 160 ° C and particularly preferably from 100 to 140 ° C, wherein the drying time is preferably 6 hours or more, for example in the range of 6 until 24 h. However, shorter drying times, such as about 1, 2, 3, 4, or 5 hours are possible depending on the moisture content of the material to be dried.
  • the drying of the separated and washed catalyst precursor can be carried out, for example, in chamber furnaces, drum dryers, rotary kilns or belt dryers.
  • the drying of the catalyst precursor can also be carried out by spray-drying a suspension of the catalyst precursor.
  • the catalyst precursors are calcined.
  • the catalyst precursors are calcined after drying.
  • thermally labile compounds of the active metals or catalyst addition elements such as carbonates, bicarbonates, nitrates, chlorides, carboxylates, oxide hydrate or hydroxides, are at least partially converted into the corresponding oxides and / or mixed oxides.
  • the temperature at which the calcination takes place depends on the preparation and the composition of the catalyst.
  • the calcination is generally carried out at a temperature in the range from 250 to 1200 ° C., preferably from 300 to 1100 ° C. and in particular from 500 to 1000 ° C.
  • the calcination takes place at a temperature of 600 ° C. and more, preferably 750 ° C. and more, and more preferably 900 ° C and more.
  • the temperatures are preferably in the range of 600 to 1200 ° C, more preferably 750 to 1 100 ° C and most preferably in the range of 900-1000 ° C.
  • the calcination is also carried out in the case of catalyst precursors whose active composition contains a basic element (embodiment a) or c)) and in the case of catalyst precursors which contain a support element with a basic element (embodiment b))
  • the temperatures are preferably in the range of 600 to 1200 ° C, more preferably 750 to 1 100 ° C and most preferably in the range of 900-1000 ° C.
  • the calcination may be carried out under any suitable gas atmosphere, with air and / or air mixtures, such as lean air, being preferred.
  • air and / or air mixtures such as lean air
  • the calcination is usually carried out in a muffle furnace, a rotary kiln and / or a Bandkalzinierofen, wherein the calcination is preferably 1 h or more, more preferably in the range of 1 to 24 h and most preferably in the range of 2 to 12 h.
  • the catalyst precursors are preferably used as powder or grit.
  • the particles then preferably have a size in the range from 50 to 2000 ⁇ m, particularly preferably 100 to 1000 ⁇ m, and particularly preferably 300 to 700 ⁇ m.
  • the catalysts or catalyst precursors are also preferably used in the form of shaped bodies in the process according to the invention.
  • Shaped bodies of any desired geometry or shape are suitable as shaped bodies. Preferred forms are tablets, rings, cylinders, star strands, wagon wheels or balls, particularly preferred are tablets, rings, cylinders, balls or star strands. Most preferably, the cylindrical shape.
  • the diameter of the spherical shape is preferably 20 mm or less, more preferably 10 mm or less, even more preferably 5 mm or less, and particularly preferably 3 mm or less.
  • the diameter of the spherical shape is preferably in the range of 0.1 to 20, more preferably 0.5 to 10 mm, most preferably 1 to 5 mm, and most preferably 1 to 5 to 3 mm.
  • the ratio of length: diameter is preferably in the range from 1: 1 to 20: 1, particularly preferably 1: 1 to 14: 1, very particularly preferably in the range from 1: 1 to 10: 1 and particularly preferably in Range from 1: 2 to 6: 1.
  • the diameter of the strands or cylinders is preferably 20 mm or less, more preferably 15 mm or less, even more preferably 10 mm or less, and particularly preferably 3 mm or less.
  • the diameter of the strands or cylinders is preferably in the range of 0.5 to 20 mm, more preferably in the range of 1 to 15 mm, most preferably in the range of 1, 5 to 10 mm.
  • the height h of the tablet is preferably 20 mm or less, more preferably 10 mm or less, even more preferably 5 mm or less, and most preferably 3 mm or less.
  • the height h of the tablet is preferably in the range of 0.1 to 20 mm, particularly preferably in the range of 0.5 to 15 mm, very particularly preferably in the range of 1 to 10 mm and particularly preferably in the range of 1 , 5 to 3 mm.
  • the ratio of height h (or thickness) of the tablet to the diameter D of the tablet is preferably 1: 1 to 1: 5, more preferably 1: 1 to 1: 2.5, most preferably 1: 1 to 1: 2 and especially preferably 1: 1 to 1: 2.
  • the molding used preferably has a bulk density (according to EN ISO 6) in the range from 0.1 to 3 kg / l, preferably from 1.5 to 2.5 kg / l and particularly preferably from 1.7 to 2.2 kg / l on.
  • Catalyst precursors which do not have the preferred shaped body geometry described above can be subjected to a shaping step.
  • the catalyst precursors are usually conditioned in which they are adjusted by grinding to a specific particle size. After milling, the conditioned catalyst precursor can be mixed with other additives, such as mold aids, such as graphite, binders, pore formers and Anteigstoffn and further processed into moldings.
  • mold aids such as graphite, binders, pore formers and Anlessnessn
  • Common methods of shaping are described, for example, in Ullmann [Ullmann's Encyclopedia Electronic Release 2000, Chapter: “Catalysis and Catalysts", pages 28-32] and by Ertl et al. [Ertl, Knözinger, Weitkamp, Handbook of Heterogenous Catalysis, VCH Weinheim, 1997, pages 98 ff].
  • Common methods of molding include extrusion, tableting, i. mechanical pressing or pelleting, i. Compacting by circular and / or rotating movements.
  • the shaping can also be done by spray-drying a suspension of the catalyst precursor.
  • After conditioning or shaping is usually a tempering.
  • the temperatures during the heat treatment usually correspond to the temperatures during the calcination.
  • the reaction of MEG and ammonia takes place on a reduced catalyst precursor.
  • the catalyst precursor is generally converted into its catalytically active form.
  • the reduction of the catalyst precursors can take place before contacting with the reactants MEG and ammonia as described below, or it can be carried out in situ in the same reactor in which the reaction of MEG with ammonia is also carried out.
  • a passivation of the catalysts can take place between the reduction of the catalyst precursors and before contacting the catalysts with the educts. If the catalysts are passivated as described below, the catalysts are reactivated before contacting or during contacting with the reactants.
  • the reduction of the catalyst precursor can be carried out at elevated temperature in a moving or stationary reduction furnace.
  • the reducing agent used is usually hydrogen or a gas containing hydrogen.
  • the hydrogen is generally used technically pure.
  • the hydrogen may also be used in the form of a hydrogen-containing gas, ie in admixtures with other inert gases, such as nitrogen, helium, neon, argon or carbon dioxide.
  • hydrogen is used together with nitrogen, wherein the volume fraction of hydrogen is preferably in the range from 1 to 50, particularly preferably 2.5 to 30 and particularly preferably 5 to 25% by volume.
  • the hydrogen stream can also be used as a circular Gas are returned to the reduction, possibly mixed with fresh hydrogen and optionally after removal of water by condensation.
  • the reduction of the catalyst precursor is preferably carried out in a reactor in which the shaped bodies are arranged as a fixed bed. Particularly preferably, the reduction of the catalyst precursor takes place in the same reactor in which the subsequent reaction of MEG with NH 3 takes place.
  • the reduction of the catalyst precursor can take place in a fluidized bed reactor in the fluidized bed.
  • the reduction of the catalyst precursor is generally carried out at reduction temperatures of 50 to 600 ° C, in particular from 100 to 500 ° C, particularly preferably from 150 to 450 ° C.
  • the hydrogen partial pressure is generally from 1 to 300 bar, in particular from 1 to 200 bar, more preferably from 1 to 100 bar, wherein the pressure data here and below relate to the absolute measured pressure.
  • the duration of the reduction is preferably 1 to 20 hours, and more preferably 3 to 15 hours.
  • a solvent may be supplied to remove any water of reaction formed and / or, for example, to heat the reactor faster and / or to be able to dissipate the heat better during the reduction can.
  • the solvent can also be supplied supercritically.
  • Suitable solvents can be used the solvents described above.
  • Preferred solvents are water; Ethers, such as methyl tert-butyl ether, ethyl tert-butyl ether, dioxane or tetrahydrofuran. Particularly preferred are water or tetrahydrofuran. Appropriate mixtures are also suitable as suitable solvents.
  • the resulting shaped article can be handled after reduction under inert conditions.
  • the molded article may be handled and stored under an inert gas such as nitrogen or under an inert liquid, for example, an alcohol, water or the product of the respective reaction, for which the catalyst is used. If necessary, the catalyst must then be freed from the inert liquid before the start of the actual reaction.
  • the storage of the catalyst under inert substances allows uncomplicated and safe handling and storage of the molding.
  • the shaped body can also be brought into contact with an oxygen-containing gas stream such as air or a mixture of air with nitrogen.
  • the passivated molding generally has a protective oxide layer. Through this protective oxide layer, the handling and storage of the catalyst is simplified, so that, for example, the incorporation of the passivated molded body is simplified in the reactor.
  • a passivated molding is preferably reduced before contacting with the starting materials as described above by treatment of the passivated catalyst with hydrogen or a gas containing hydrogen.
  • the reduction conditions generally correspond to the reduction conditions used in the reduction of the catalyst precursors. Activation typically removes the protective passivation layer.
  • ethylene glycol is preferred technical ethylene glycol having a purity of at least 98%, and most preferably ethylene glycol having a purity of at least 99% and most preferably of at least 99.5%.
  • the ethylene glycol used in the process can be made from ethylene, which is available from petrochemical processes.
  • ethylene oxide in a first stage, which is subsequently reacted with water to form ethylene glycol.
  • the ethylene oxide obtained can also be converted in the so-called omega process with carbon dioxide to ethylene carbonate, which can then be hydrolyzed to ethylene glycol with water.
  • the omega process is characterized by a higher selectivity for ethylene glycol, since fewer by-products, such as di- and triethylene glycol arise.
  • ethene can also be made from regrowing raw materials.
  • ethene can be formed by dehydration of bio-ethanol.
  • ammonia conventionally commercially available ammonia can be used, for example ammonia with a content of more than 98 wt .-% ammonia, preferably more than 99% by weight of ammonia, preferably more than 99.5% by weight, in particular more than 99.8% by weight, of ammonia.
  • the process according to the invention is preferably carried out in the presence of hydrogen.
  • the hydrogen is generally used technically pure.
  • the hydrogen may also be in the form of a gas containing hydrogen, i. with admixtures of other inert gases, such as nitrogen, helium, neon, argon or carbon dioxide are used.
  • inert gases such as nitrogen, helium, neon, argon or carbon dioxide
  • reformer effluents, refinery gases, etc. can be used as the hydrogen-containing gases, if and insofar as these gases do not contain any contact poisons for the catalysts used, for example CO.
  • preference is given to using pure hydrogen or essentially pure hydrogen in the process for example hydrogen having a content of more than 99% by weight of hydrogen, preferably more than 99.9% by weight of hydrogen, particularly preferably more than 99.99 Wt .-% hydrogen, in particular more than 99.999 wt .-% hydrogen.
  • the reaction of ethylene glycol with ammonia and an amination catalyst takes place in the gas phase.
  • reaction in the gas phase means that the reaction conditions, such as pressure and temperature, are set so that ethylene glycol and NH 3 are present in the gas phase and the gaseous stream around the amination catalyst.
  • Suitable reactors for the gas phase reaction are generally tubular reactors and fluidized bed reactors. In the tube reactors, the catalyst can be arranged as a flow or fixed bed.
  • the reaction of ethylene glycol with NH 3 takes place in a tubular reactor in which the amination catalyst is arranged as solidified.
  • reaction of ethylene glycol with ammonia takes place in a fluidized-bed reactor.
  • the reaction of MEG with NH 3 in the gas phase preferably takes place at a pressure in the range from 0.05 to 20 MPa, particularly preferably 0.1 to 10 MPa, very particularly preferably 0.3 to 5 MPa, and more preferably 0.5 to 3 MPa.
  • the pressure is in the range of 0.7 to 1.5 Mpa.
  • the temperature is preferably in the range from 120 to 600 ° C., more preferably in the range from 180 to 500 ° C., very particularly preferably in the range from 200 to 350 ° C. and particularly preferably in the range from 220 to 270 ° C.
  • the educts are preferably fed to the reactor in gaseous form and brought into contact with the amination catalyst in gaseous form.
  • the reactants are usually passed before the introduction into the reactor via a heat exchanger and evaporated. Possibly. the evaporation can also be done by a flash evaporation.
  • the proportion of MEG in the gas stream which is brought into contact with the amination catalyst is generally in the range from 0.1 to 10% by volume, preferably from 0.5 to 7.5% by volume, very particularly preferably from 1 to 6.5% by volume, and more preferably 2.5 to 5% by volume.
  • the proportion of NH 3 in the gas stream which is brought into contact with the amination catalyst is generally in the range from 5 to 90% by volume, preferably 10 to 80% by volume, very particularly preferably 25 to 60% by volume. and particularly preferably 30 to 45% by volume.
  • the molar ratio of NH 3 to MEG is generally in the range from 1: 1 to 50: 1, preferably 5: 1 to 30: 1, more preferably 10: 1 to 20: 1, particularly preferably 13: 1 to 16: 1.
  • the gas stream which is contacted with the amination catalyst may optionally contain hydrogen.
  • the proportion of h in the gas stream, which is brought into contact with the amination catalyst is generally in the range of 0.1 to 70 vol .-%, preferably 0.5 to 50 vol .-%, particularly preferably 1 to 40 vol .-%, most preferably 2.5 to 35 vol .-% and particularly preferably 5 to 25 vol .-%.
  • the gas stream contacted with the amination catalyst contains an inert gas.
  • Preferred inert gases are noble gases such as He, Ne, Ar, nitrogen and mixtures thereof.
  • Very particularly preferred inert gases are Ar and nitrogen, or mixtures thereof.
  • the proportion of inert gas in the gas stream which is brought into contact with the amination catalyst is generally in the range from 5 to 90% by volume, preferably 10 to 80% by volume, very particularly preferably 25 to 60% by volume. and particularly preferably 30 to 50% by volume.
  • the gas stream which is brought into contact with the amination catalyst less than 3 vol.%, Particularly preferably less than 0.1 vol .-%, completely more preferably less than 0.005% by volume and more preferably less than 0.00001% by volume of water.
  • the gas hourly space velocity (GHSV), which is brought into contact with the amination catalyst, is generally 100 to 30,000 h -1 , preferably 500 to 20,000 hr 1 , particularly preferably 1,000 to 15,000 hr 1 and especially preferably 3000 to 8000 hr 1 .
  • the conversion of MEG is generally in the range of 5 to 60%, preferably in the range of 10 to 55% and most preferably in the range of 20 to 50%.
  • the effluent from the amination reactor contains the products of the amination reaction, unreacted starting materials, such as ethylene glycol and ammonia, and hydrogen and water in gaseous form.
  • the discharge from the amination reactor further contains the corresponding ethanolamines and / or ethylene amines based on MEG.
  • the effluent from the amination reactor contains MEA and EDA.
  • the reaction also preferably contains higher, linear ethylene amines of the general formula where R is a radical of the formula - (NH-CH 2 -CH 2) x -NH 2, where x is an integer in the range from 1 to 4, preferably 1 to 3, very particularly preferably 1 to 2.
  • the reaction effluent contains DETA, TETA and PETA, most preferably DETA and TETA and most preferably DETA.
  • the discharge from the amination reactor can also higher, linear ethanolamines of the formula where R is a radical of the formula - (NH-CH 2 -CH 2) xNH 2, where x is an integer in the range from 1 to 4, preferably 1 to 3, very particularly preferably 1 to 2.
  • reaction can also cyclic ine the formula
  • Ri is a radical of the formula - (CH 2 -CH 2 -NH) x-CH 2 -CH 2 -OH, where x is an integer in the range from 0 to 4, preferably 0 to 3 and particularly preferably 1 to 2, and R 2 is independently or simultaneously either H or a radical of the formula - (CH 2 -CH 2 -NH) x -CH 2 -CH 2 -OH, where x is an integer in the range from 0 to 4, preferably 0 to 3 and particularly preferably 1 to 2 or is a radical of the formula - (CH 2 -CH 2 -NH) x-CH 2 -CH 2 -NH 2, where x is an integer in the range from 0 to 4, preferably 0 to 3 and more preferably 1 to 2.
  • the reaction can also cyclic ethyleneamines of the general formula
  • R 1 and R 2 independently or simultaneously may be either H or a radical of the formula - (CH 2 -CH 2 -NH) x -CH 2 -CH 2 -NH 2, where X is an integer in the range of 0 to 4, preferably 0 to 4 and more preferably 1 to 2.
  • cyclic ethyleneamines contained in the reaction effluent are piperazine and AEPIP.
  • the effluent contains from 1 to 60% by weight of MEA.
  • MEA from 1 to 90% by weight of EDA, from 0.1 to 30% by weight of higher cyclic ethylene amines such as PIP and AEPIP, from 0.1 to 30% by weight higher linear ethylene amines such as DETA, TETA and TEPA.
  • the discharge particularly preferably contains 10 to 50% by weight of MEA. 25 to 85% by weight of EDA, 0.25 to 10% by weight of cyclic ethylene amines such as PIP and AEPIP, 1 to 30% by weight of higher linear ethylene amines such as DETA, TETA and TEPA.
  • the effluent contains from 15 to 45 weight percent MEA. 30 to 70% by weight of EDA, 0.5 to 5% by weight of cyclic ethylene amines such as PIP and AEPIP, 5 to 25% by weight of higher linear ethylene amines such as DETA, TETA and TEPA.
  • the discharge from the Aminticiansreaktor contains the amination catalyst, which is usually separated by a suitable device of the gaseous components, for example by a solid separation, which is usually designed as a centrifugal separator (or cyclone or Zyklonabscheider).
  • a suitable device of the gaseous components for example by a solid separation, which is usually designed as a centrifugal separator (or cyclone or Zyklonabscheider).
  • the gaseous discharge is usually worked up so that the various components are separated from each other.
  • the gaseous discharge is partially condensed, so that hydrogen and possibly ammonia remain in the gas phase and the other components in the discharge are transferred into the liquid phase.
  • the gaseous components are usually separated from the liquid components in a gas-liquid separator.
  • the gaseous components can be recycled individually (after a further work-up step) or together into the amination reactor.
  • the discharge from the amine reactor optionally contains ammonia, unreacted ethylene glycol, water and the amination products.
  • the separation of the discharge from the amination reactor preferably takes place in two separation sequences, each separation sequence comprising a multistage distillation. Such work-up is described for example in EP-B1 -198699. Accordingly, in the first separation sequence, first water and ammonia are separated and in the second
  • the discharge from the amine reactor in the process according to the invention has a high ratio of MEA and EDA to PIP and AEEA. Furthermore, the amount of undesirable by-products such as non-condensable decomposition products and higher condensation products can be reduced. Both by-products can lead to a reduction of carbon balance. In the former case, volatile low molecular weight decomposition products may be formed. On the other hand, higher condensation products can be deposited on the catalysts, where they can additionally coke. This can reduce the activity of the catalyst. Achieving high selectivity ratio SQ is economically advantageous because the demand for linear amination products such as MEA and EDA is higher than the demand for the cyclic compound PIP or for the linear, higher ethanolamine AEEA.
  • the invention is illustrated by the following examples:
  • Comparative Example 1 Calcination of the catalyst precursor at low temperatures
  • the metal content of the catalyst precursor thus obtained was 33% by weight of Cu, 38% by weight of Zn and 3.4% by weight Zr.
  • Example 1 Calcination of the Catalyst Precursor at High Temperatures The preparation was carried out analogously to Comparative Example 1, with the difference that the dried, powdery residue was heated to 900 ° C. (heating rate 10 K / min) and calcined at 900 ° C. for 120 minutes.
  • the metal content of the catalyst precursor thus obtained was 36% by weight of Cu, 41% by weight of Zn and 3.8% by weight of Zr.
  • Comparative Example 2 Calcination of the catalyst precursor at low temperatures 103.8 g of Cu nitrate solution (CuO content: 19.3% by weight) and 336.9 g of Ca nitrate were mixed with 300 ml of water. Thereafter, 100 g of y-alumina powder was mixed with water. To the aqueous alumina suspension was added the previously prepared metal salt solution. By adding NaOH, a pH of 5 was adjusted to precipitate a precipitate. After precipitation, the pH was raised to 8 and the mixture was left at the pH for 15 minutes. Subsequently, the precipitated precipitate was filtered off and washed. The filter residue was dried for 16 hours at 120 ° C. After drying, the dried residue was heated to 500 ° C (heating rate 10 K min) and calcined at 500 ° C for 120 minutes.
  • the metal content of the catalyst precursor thus obtained was 16.8% by weight of Al, 21.4% by weight of Ca, 6.4% by weight of Cu
  • Example 2 Calcination of the catalyst precursor at high temperatures
  • the preparation was carried out analogously to Comparative Example 2, with the difference that the dried residue was heated to 900 ° C (heating rate 10 K min) and calcined at 900 ° C for 120 minutes.
  • the metal content of the catalyst precursor thus obtained was 19.9% by weight of Al, 25.5% by weight of Ca, 7.6% by weight of Cu
  • Comparative Example 3 Calcination of the Catalyst Precursor at Low Temperatures 200 g of Siliperl AF 125 (grit: 250-500 ⁇ m) were impregnated with 152 ml of a metal salt solution having the following composition: 45% by weight of CuO of Cu nitrate; 50% by weight ZnO from Zn nitrate, 5% by weight ZrO 2 from Zr acetate). The amount of metal salt solution used corresponds to 95% of the maximum water absorption of the catalyst support. After impregnation, the catalyst precursor was dried at 120 ° C for 16 hours. Thereafter, the dried catalyst precursor was heated to 500 ° C (heating rate 10 K / min) and calcined at 500 ° C for 120 minutes.
  • the metal content of the catalyst precursor thus obtained was 10.9% by weight, 12.6% by weight of Zn and 1.1% by weight of Zr.
  • Example 3 Calcination of the catalyst precursor at high temperatures
  • the preparation was carried out analogously to Comparative Example 3, with the difference that the dried residue was heated to 900 ° C (heating rate 10 K min) and calcined at 900 ° C for 120 minutes.
  • the metal content of the catalyst precursor thus obtained was 10.9% by weight, 12.8% by weight of Zn and 1.1% by weight of Zr.
  • Reaction of MEG and NH3 Example 4: The calcined catalyst precursors were tabletted and split and sieved to obtain its size distribution of particles in the powder of 0.315 to 0.5 mm.
  • the powder was placed in a tube reactor and fixed with two quartz frits.
  • the diameter of the fixed catalyst bed was 4 mm and the length 80 mm.
  • the tubular reactor was heated to the reaction temperature indicated in Table 1.
  • Ammonia was evaporated in a gas stream of nitrogen and hydrogen (hydrogen content see Table 1) in a first evaporator.
  • the evaporation temperature was chosen so that the amount of ammonia in the gas stream corresponds to the amount given in Table 1.
  • MEG was vaporized into the gas stream.
  • the evaporation temperature was chosen so that the amount of MEG in the gas stream corresponds to the amount indicated in Table 1.
  • the gas stream was heated to the temperature indicated in Table 1 and passed over the reactor at 10 bar.
  • the gas hourly space velocity (GHSV) was 5,000 hours.
  • composition of the gas stream was determined by gas chromatography and is given in Table 1.
  • the metal content of the catalyst precursor thus obtained was 33% by weight of Cu, 38% by weight of Zn and 3.4% by weight of Zr.
  • Example 5A Catalyst precursor containing a basic component by mixed precipitation
  • the metal content of the catalyst precursor thus obtained was 6.1% by weight of Cu, 30% by weight of Zn and 21.2% by weight of Ca.
  • Example 5B Catalyst Precursor by Impregnation of a Basic Support Material An impregnation solution was prepared by mixing an aqueous solution of Cu nitrate
  • a carrier material composition: 56% by weight ZnO, 44% by weight CaO
  • particle size: 315-500 ⁇ m 100 g of a carrier material (composition: 56% by weight ZnO, 44% by weight CaO) (particle size: 315-500 ⁇ m) were impregnated with 33.5 ml of the impregnation solution.
  • the impregnated catalyst precursor was dried at 120 ° C for 16 hours. After drying, the dried catalyst precursor was heated to 500 ° C (heating rate 10 K / min) and calcined at 500 ° C for 120 minutes.
  • Example 5C catalyst precursor by impregnation of a basic carrier material
  • the impregnation solution was prepared by mixing Cu nitrate and water so that the theoretical CuO oxide content of the solution was 19.3% by weight.
  • 100 g of a carrier material composition: 56 wt .-% ZnO, 44 wt .-% CaO
  • particle size: 315-500 ⁇ were impregnated with 33.5 ml of impregnation solution.
  • the further treatment of the catalyst precursor was carried out analogously to Example 5B.
  • the calcined catalyst precursors were conditioned to obtain a size distribution of the particles in the powder of 0.315 to 0.5 mm.
  • the powder was placed in a tube reactor and fixed with two quartz frits.
  • the diameter of the fixed catalyst bed was 4 mm and the length 80 mm.
  • the tubular reactor was heated to the reaction temperature indicated in Table 2.
  • Ammonia was evaporated in a gas stream of nitrogen and hydrogen (hydrogen content see Table 2) in a first evaporator.
  • the evaporation temperature was chosen so that the amount of ammonia in the gas stream corresponds to the amount given in Table 1.
  • MEG was vaporized into the gas stream.
  • the evaporation temperature was chosen so that the amount of MEG in the gas stream corresponds to the amount indicated in Table 2.
  • the gas stream was heated to the temperature indicated in Table 2 and passed over the reactor at 10 bar.
  • the gas hourly space velocity (GHSV) was 5,000 hours.
  • composition of the gas stream was determined by gas chromatography and is given in Table 2.
  • the improvement in carbon balance is an indication that both the formation of low-molecular-weight decomposition products that can not be detected by GC and the formation of high-molecular condensates, which are also not detected by GC, has decreased.
  • the high molecular weight condensates can lead to deposits on the catalyst, which can reduce the activity of the catalyst.

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Abstract

La présente invention concerne un procédé pour la préparation d'éthanolamines et/ou d'éthylénamines en phase gazeuse par transformation d'éthylèneglycol avec de l'ammoniac en présence d'un catalyseur d'amination. Le procédé est caractérisé en ce que le catalyseur d'amination est préparé par réduction d'un précurseur catalytique calciné, qui comprend une masse active, la masse active contenant un ou plusieurs métaux actifs choisis dans le groupe constitué par les éléments des groupes 8, 9, 10 et 11 du système périodique des éléments et éventuellement un ou plusieurs éléments catalytiques supplémentaires choisis dans le groupe constitué par les métaux et les semi-métaux des groupes 3 à 7 et 12 à 7, l'élément P et les éléments des terres rares. En outre, le procédé est caractérisé en ce qu'un précurseur catalytique présentant une faible basicité est utilisé, la faible basicité étant obtenue en ce que a) le précurseur catalytique est préparé par précipitation mixte et la masse active contient en outre un ou plusieurs éléments basiques choisis dans le groupe constitué par les métaux alcalins et les métaux alcalino-terreux ; ou b) le précurseur catalytique contient, outre la masse active, en plus un matériau support et est préparé par imprégnation du matériau support ou par précipitation sur le matériau support et le matériau support contient un ou plusieurs éléments basiques choisis dans le groupe constitué par les métaux alcalins, Be, Ca, Ba et Sr ou un ou plusieurs minéraux choisis dans le groupe constitué par l'hydrotalcite, le chrysotile et la sépiolite ; ou c) le précurseur catalytique contient, outre la masse active, en plus un matériau support et est préparé par imprégnation du matériau support ou par précipitation sur le matériau support et la masse active du support catalytique contient un ou plusieurs éléments basiques choisis dans le groupe constitué par les métaux alcalins et les métaux alcalino-terreux ; ou d) le précurseur catalytique est calciné à des températures de 600°C ou plus ; ou e) le précurseur catalytique est préparé par une combinaison des variantes a) et d) ou par une combinaison des variantes b) et d) ou par une combinaison des variantes c) et d).
EP17809318.3A 2016-12-15 2017-12-07 Procédé pour la préparation d'éthanolamines et/ou d'éthylénamines Withdrawn EP3555040A1 (fr)

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CN114713224B (zh) * 2022-04-02 2023-06-23 厦门大学 一种用于催化乙醇胺化制备乙基胺的催化剂及其制备方法和应用

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US3137730A (en) 1960-04-12 1964-06-16 Allied Chem Production of ethylenediamine
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US4434300A (en) * 1982-09-13 1984-02-28 Air Products And Chemicals, Inc. Methanol amination
US4653677A (en) 1985-04-16 1987-03-31 The Dow Chemical Company Vessel having a molten material outlet
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JP4938802B2 (ja) 2006-02-14 2012-05-23 ビーエーエスエフ ソシエタス・ヨーロピア モノエチレングリコール（ｍｅｇ）からのエチレンアミン及びエタノールアミンの製造方法
EP2346602B1 (fr) 2008-09-19 2014-03-19 Basf Se Procédé de préparation en continu d'une amine au moyen d'un catalyseur à base d'aluminium et de cuivre
CN102190588A (zh) 2010-03-16 2011-09-21 张家港惠尔化学科技有限公司 乙二醇与氨制乙二胺的方法
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