WO2012015060A1 - プロピレンの製造方法 - Google Patents
プロピレンの製造方法 Download PDFInfo
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- WO2012015060A1 WO2012015060A1 PCT/JP2011/067604 JP2011067604W WO2012015060A1 WO 2012015060 A1 WO2012015060 A1 WO 2012015060A1 JP 2011067604 W JP2011067604 W JP 2011067604W WO 2012015060 A1 WO2012015060 A1 WO 2012015060A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C1/00—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon
- C07C1/20—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11, as exemplified by patent documents US3702886, GB1334243 and US3709979, respectively
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/0009—Use of binding agents; Moulding; Pressing; Powdering; Granulating; Addition of materials ameliorating the mechanical properties of the product catalyst
- B01J37/0063—Granulating
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2529/00—Catalysts comprising molecular sieves
- C07C2529/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites, pillared clays
- C07C2529/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- C07C2529/40—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of the pentasil type, e.g. types ZSM-5, ZSM-8 or ZSM-11
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
Definitions
- the present invention relates to a method for producing propylene from methanol and / or dimethyl ether.
- Patent Document 1 discloses that methanol and / or zeolite using a zeolite (such as Ca-type ZSM-5) modified by contacting a zeolite such as ZSM-5 with a solution of an alkaline earth metal-containing compound such as calcium.
- a method for producing lower olefins such as ethylene and propylene from dimethyl ether is disclosed. According to the production of this lower olefin, there is little decomposition into CO and CO 2 , the lower olefin can be obtained with high selectivity, paraffin and aromatic by-products are few, and carbon deposition on the catalyst is suppressed. Further, it is described that the catalyst activity is not lowered and the catalyst is not deteriorated even at a high temperature.
- Patent Document 2 discloses at least proton type MFI structure zeolite and / or ammonium type MFI structure zeolite (first component), alkaline earth metal compound (second component), aluminum oxide and / or hydroxylation.
- a composite composed of one, two or more (third component) selected from the group consisting of an oxide, a silicon oxide and / or a hydroxide, and a clay; specifically, an ammonium-type MFI structure zeolite;
- a method of synthesizing a lower olefin such as propylene from dimethyl ether and / or methanol using a complex composed of boehmite (AlO (OH)) and calcium carbonate as a catalyst is disclosed. This catalyst is described as having a long catalyst life in order to suppress aluminum from being desorbed from the zeolite lattice by both the second component and the third component.
- the conversion reaction of methanol and / or dimethyl ether to a lower olefin is an exothermic reaction, and is usually a raw material as in Examples of Patent Document 1 and Patent Document 2 in order to suppress a temperature increase due to reaction heat.
- Methanol and / or dimethyl ether is diluted with an inert gas such as nitrogen or argon and supplied onto the catalyst. Further, methanol and / or dimethyl ether may be diluted with water vapor.
- An object of the present invention is to provide a method for producing propylene, which suppresses deterioration of the catalyst and makes it possible to use the catalyst for a long period of time in a method for producing propylene from methanol and / or dimethyl ether using an MFI type zeolite catalyst. It is to be.
- the present invention relates to the following matters.
- a process for producing propylene from methanol and / or dimethyl ether Having a step of synthesizing propylene by circulating a raw material gas containing methanol and / or dimethyl ether and one or more saturated hydrocarbons having 4 to 8 carbon atoms as a diluent through a catalyst layer containing MFI-type zeolite.
- methanol and / or dimethyl ether is diluted with a saturated hydrocarbon (paraffin) having 4 to 8 carbon atoms, preferably 5 to 7 carbon atoms such as pentane, and supplied onto the catalyst to produce propylene.
- a saturated hydrocarbon paraffin having 4 to 8 carbon atoms, preferably 5 to 7 carbon atoms such as pentane
- a diluent By using a diluent, it is possible to suppress an increase in temperature due to heat generation during the propylene synthesis reaction.
- inert gases such as nitrogen and argon have been used as diluents, but the use of saturated hydrocarbons with 4 to 8 carbon atoms suppresses the formation of aromatic hydrocarbon compounds, and coking of zeolite catalysts. (Carbon deposition on the catalyst surface) is suppressed, and the catalyst life is increased by, for example, about 1.5 times. Further, by cooling the product after the reaction and performing gas-liquid separation, the saturated hydrocarbon having 4 to 8 carbon atoms as a diluent can be easily separated and recovered.
- olefins having 4 or more carbon atoms are by-produced.
- the by-product olefin having 4 or more carbon atoms is separated together with the saturated hydrocarbon having 4 to 8 carbon atoms (paraffin) as the diluent.
- these olefins having 4 or more carbon atoms are mainly converted into lower olefins under the reaction conditions for the synthesis of propylene from methanol and / or dimethyl ether, and about 40 to 50% of them are converted into propylene.
- propylene synthesis by directly recycling hydrocarbons containing 4 to 8 carbon saturated hydrocarbons (paraffins) used as diluents and olefins with 4 or more carbon atoms as by-products, separated from the product. It can be used as a reaction diluent and reactant.
- the production method of the present invention that can be recycled as it is without separating the diluent and by-products is advantageous in terms of cost.
- saturated hydrocarbons having 4 to 8 carbon atoms, preferably 5 to 7 carbon atoms, used as diluents in the present invention have a relatively large specific heat
- the temperature rise due to the synthesis reaction of olefins from methanol and / or dimethyl ether. Can be suppressed.
- the temperature rise due to the reaction may be 200 ° C. or more, but according to the present invention, the temperature rise due to the reaction can be adjusted within an appropriate range (about 30 to 40 ° C.). It becomes.
- 6 is a graph showing the change over time in the conversion rate of dimethyl ether (DME) and the composition of the generated hydrocarbon in a propylene synthesis reaction using C 5 H 12 as a diluent in Example 2.
- 6 is a graph showing the time course of the conversion ratio of methanol (MeOH) and the composition of the generated hydrocarbon in the propylene synthesis reaction using only N 2 as the diluent of Comparative Example 1.
- FIG. 6 is a graph showing the time course of the conversion rate of methanol (MeOH) and the composition of the generated hydrocarbon in a propylene synthesis reaction using H 2 O as a diluent in Comparative Example 2. It is a graph which shows the reaction result of the propylene synthesis reaction which used the dimethyl ether of the reference example 1, or various olefins as a reaction raw material. It is a graph which shows the reaction result of the propylene synthesis reaction which used various olefins of the reference example 2 as a reaction raw material with dimethyl ether.
- a raw material gas containing methanol and / or dimethyl ether and one or more saturated hydrocarbons having 4 to 8 carbon atoms, preferably 5 to 7 carbon atoms as a diluent is used as a catalyst layer containing MFI type zeolite.
- Propylene is synthesized by distribution.
- the catalyst used in the present invention is MFI-type zeolite, and may be one carrying one or more metals, or a mixture of other metal oxides or carbonates.
- any of the catalysts used for the propylene synthesis reaction can be suitably used.
- the MFI-type zeolite is not particularly limited, SiO 2 / Al 2 O 3 ratio is preferably 300 or more MFI-type zeolite.
- the SiO 2 / Al 2 O 3 ratio of the MFI type zeolite is more preferably 500 or more, and particularly preferably 800 or more.
- the upper limit of the SiO 2 / Al 2 O 3 ratio of the MFI type zeolite is not particularly limited, but is usually about 3000, preferably about 2500.
- the MFI zeolite used in the present invention may support one or more metals (or metal compounds).
- proton type MFI type zeolite or MFI type zeolite carrying Ca is preferable.
- the coking resistance and the durability of the catalyst are further improved, and the olefin selectivity may be further improved.
- the supported amount of Ca is usually preferably about 0.5 to 5.0 in terms of atomic weight ratio (Ca / Al ratio) with respect to aluminum atoms in the zeolite. .
- the metal-supported MFI zeolite such as Ca can be prepared by supporting a metal such as Ca on the MFI-type zeolite by a known method such as an ion exchange method or an impregnation method.
- MFI type zeolite as a catalyst may use 1 type, or may use 2 or more types together.
- the catalyst MFI-type zeolite can be used by mixing with silica, alumina, other binders and the like.
- silica is used, the content of silica in the catalyst layer can be, for example, about 5 to 500 parts by weight, preferably about 10 to 400 parts by weight with respect to 100 parts by weight of MFI zeolite.
- the catalyst layer may contain an aluminum compound such as basic alumina or calcium aluminate.
- an aluminum compound such as basic alumina or calcium aluminate.
- the content of the aluminum compound in the catalyst layer can be, for example, 10 parts by weight or less, preferably about 1 to 3 parts by weight with respect to 100 parts by weight of the MFI zeolite.
- the catalyst layer may contain other additive components as long as the desired effect is not impaired.
- the propylene synthesis reaction can be carried out by a known method except that a saturated hydrocarbon having 4 to 8 carbon atoms, preferably 5 to 7 carbon atoms, is used as a diluent.
- methanol or dimethyl ether can be used alone as a reaction raw material, or a mixture of methanol and dimethyl ether can be used.
- a mixture of methanol and dimethyl ether is used as a reaction raw material, the content ratio of methanol and dimethyl ether is not particularly limited and can be determined as appropriate.
- the saturated hydrocarbon having 4 to 8 carbon atoms, preferably 5 to 7 carbon atoms, which is a diluent is preferably a linear or branched paraffin, specifically, butane, pentane, hexane, heptane, octane. Is mentioned. It is particularly preferred to use pentane, hexane, heptane as diluent. These diluents may be used alone or in combination of two or more.
- a gas (also referred to as a raw material gas) fed into the reactor is It may contain an inert gas such as nitrogen or argon.
- an olefin may be mixed in the gas (raw material gas) fed into the reactor, and these react with methanol and / or dimethyl ether, or react alone, methanol and / or A product having the same composition as when only dimethyl ether is reacted is obtained.
- the content of methanol and / or dimethyl ether in the gas (raw material gas) fed into the reactor can be selected as appropriate, and is, for example, about 5 to 50 mol%, more preferably about 20 to 40 mol%. Is preferred.
- the content of the saturated hydrocarbon having 4 to 8 carbon atoms in the gas (raw material gas) fed into the reactor can be appropriately selected, but the total content is preferably 6.5 mol% or more, and 7.5 More preferably, mol% or more is more preferable, 10 mol% or more is especially preferable, 20 mol% or more is further more preferable, and 80 mol% or less is preferable. Moreover, less than 60 mol% is preferable, 50 mol% or less is especially preferable, and 45 mol% or less may be further more preferable.
- the raw material gas is methanol and / or dimethyl ether and one or more saturated hydrocarbons having 4 to 8 carbon atoms, or methanol and / or dimethyl ether and saturated carbon atoms having 4 to 8 carbon atoms. It preferably consists essentially of one or more hydrocarbons and an olefin having 4 or more carbon atoms (by-product of the propylene synthesis reaction).
- the raw material gas does not substantially contain water vapor.
- the catalyst tends to deteriorate.
- the reaction can be carried out in a fixed bed, fluidized bed, moving bed or the like.
- the reaction type and the reactor to be used are preferably selected from both aspects of reaction temperature control and catalyst regeneration method.
- the reaction temperature can be appropriately determined, but is preferably about 300 to 650 ° C, particularly preferably about 400 to 600 ° C.
- the reaction can be suitably performed usually under normal pressure, but may be performed under reduced pressure or under pressure.
- the reaction pressure can be, for example, about 0.1 to 0.2 MPa.
- W / F ratio of catalyst weight W (g) and raw material gas total flow rate F (mol / h)
- W / F ratio of catalyst weight W (g) and raw material gas total flow rate F (mol / h)
- the liquid hydrocarbon having 4 or more carbon atoms separated from the reaction product gas can be recycled as it is after being separated from the produced water and used as a diluent for the propylene synthesis reaction. It is advantageous in terms of cost that the by-product of the propylene synthesis reaction can be used as it is without being separated.
- the catalyst deteriorated by coking can be regenerated by heat-treating in an oxygen-containing gas stream and burning and removing the carbon deposited on the catalyst surface.
- the time required to regenerate the catalyst can be increased by, for example, about 1.5 times.
- the cause of the deterioration of the activity of the catalyst of the present invention during the reaction is mainly due to the deposition of carbon, and the activity is restored by contact with an oxygen-containing gas such as air at a temperature of about 500 to 600 ° C. can do.
- Example 1 A proton type MFI type zeolite having a SiO 2 / Al 2 O 3 ratio of 2000 and SiO 2 are uniformly mixed at 5: 1 (weight ratio), and pressure-molded to a particle size of 0.75 to 1.17 mm. A catalyst was prepared.
- a raw material gas having a composition of [MeOH: C 5 H 12 : N 2 30: 60: 10 to 30: 0: 70 (molar ratio)] was circulated through the catalyst layer to carry out a propylene synthesis reaction.
- Product analysis was performed by gas chromatography.
- FIG. 1 shows the conversion rate of methanol (MeOH) 20 hours after the start of the reaction and the composition of the generated hydrocarbon.
- the aromatic hydrocarbon compound is very stable, and once produced, it is not decomposed and grows into coke that deactivates the catalyst. It is important to suppress the production of aromatic hydrocarbon compounds, and the amount of aromatic hydrocarbon compounds produced is an indicator of the durability (coking resistance) of the catalyst. The smaller the amount of aromatic hydrocarbon compound produced, the better the coking resistance.
- Example 2 About 1% by weight of Ca was supported on a proton-type MFI zeolite having a SiO 2 / Al 2 O 3 ratio of 1500 by a conventional ion exchange method to prepare a Ca-supported MFI zeolite. Then, Ca-supported MFI-type zeolite and SiO 2 were uniformly mixed at 5: 1 (weight ratio), and pressure-molded to a particle size of 0.75 to 1.17 mm to prepare a catalyst.
- FIG. 2 shows the change over time of the conversion rate of dimethyl ether (DME) and the composition of the generated hydrocarbon. No catalyst deterioration (decrease in catalyst activity) was observed until 1612 hours after the start of the reaction.
- DME dimethyl ether
- FIG. 3 shows the change over time of the conversion rate of dimethyl ether (DME) and the composition of the generated hydrocarbon.
- DME dimethyl ether
- FIG. 4 shows the time course of the conversion of methanol (MeOH) and the composition of the generated hydrocarbon.
- MeOH methanol
- FIG. 5 shows the conversion rate of dimethyl ether (DME) 20 hours after the start of the reaction and the composition of the generated hydrocarbon.
- DME dimethyl ether
- the composition of the product When reacted with olefin alone, the composition of the product was different from when reacted with DME alone, and the composition of the product was also different depending on the olefin.
- FIG. 6 shows the conversion rate of dimethyl ether (DME) 20 hours after the start of the reaction and the composition of the generated hydrocarbon.
- DME dimethyl ether
- i-C4, C5, C6, and C8 are 1-butene, isobutene, pentene, hexene, and octene, respectively.
- Example 3 and Comparative Example 3 When a DME / N 2 mixture containing 30 mol% of DME (dimethyl ether) is reacted on the above catalyst, the catalyst layer inlet temperature is 450 ° C. and the catalyst layer outlet temperature is 520 ° C., and the amount of methane and isobutane produced increases, and propylene is selected. The rate is as low as 5%, and there are many cokes on the catalyst.
- DME dimethyl ether
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Abstract
Description
メタノールおよび/またはジメチルエーテルと、希釈剤として炭素数4~8の飽和炭化水素の1種以上とを含む原料ガスを、MFI型ゼオライトを含む触媒層に流通させることにより、プロピレンを合成する工程を有することを特徴とする方法。
SiO2/Al2O3比が2000のプロトン型のMFI型ゼオライトと、SiO2とを5:1(重量比)で均一に混合し、粒子サイズ0.75~1.17mmに加圧成型して、触媒を調製した。
常法のイオン交換法により、SiO2/Al2O3比が1500のプロトン型のMFI型ゼオライトに約1重量%のCaを担持して、Ca担持MFI型ゼオライトを調製した。そして、Ca担持MFI型ゼオライトと、SiO2とを5:1(重量比)で均一に混合し、粒子サイズ0.75~1.17mmに加圧成型して、触媒を調製した。
実施例2と同様にして調製した触媒1.2gを固定床反応器に充填し、常圧で、反応温度450℃、W/F=10g・h/molで、組成がDME:N2=40:60(モル比)の原料ガスを触媒層に流通させ、プロピレン合成反応を行った。生成物の分析はガスクロマトグラフィーによって行った。
SiO2/Al2O3比が2500のプロトン型のMFI型ゼオライトと、SiO2とを5:1(重量比)で均一に混合し、粒子サイズ0.75~1.17mmに加圧成型して、触媒を調製した。
SiO2/Al2O3比が400のプロトン型のMFI型ゼオライトと、SiO2とを5:1(重量比)で均一に混合し、粒子サイズ0.75~1.17mmに加圧成型して、触媒を調製した。
参考例1と同様にして調製した触媒1.2gを固定床反応器に充填し、常圧で、反応温度450℃、W/F=10g・h/molで、図6に示すジメチルエーテル(DME)と種々のオレフィンを反応原料として用いた、組成がDME:オレフィン:N2=10:10:80(モル比)の原料ガスを触媒層に流通させ、プロピレン合成反応を行った。生成物の分析はガスクロマトグラフィーによって行った。
DME(ジメチルエーテル)30モル%を含むDME/N2混合物を上記触媒上で反応させると、触媒層入口温度450℃、触媒層出口温度520℃となり、メタンおよびイソブタンの生成量が増加し、プロピレン選択率は5%程度低く、触媒上のコークも多い。
Claims (8)
- メタノールおよび/またはジメチルエーテルからプロピレンを製造する方法であって、
メタノールおよび/またはジメチルエーテルと、希釈剤として炭素数4~8の飽和炭化水素の1種以上とを含む原料ガスを、MFI型ゼオライトを含む触媒層に流通させることにより、プロピレンを合成する工程を有することを特徴とする方法。 - 前記MFI型ゼオライトのSiO2/Al2O3比が300~3000であることを特徴とする請求項1に記載のプロピレンの製造方法。
- 前記MFI型ゼオライトのSiO2/Al2O3比が800~2500であることを特徴とする請求項2に記載のプロピレンの製造方法。
- 前記MFI型ゼオライトがプロトン型のMFI型ゼオライト、またはCaを担持したMFI型ゼオライトであることを特徴とする請求項1~3のいずれかに記載のプロピレンの製造方法。
- 前記触媒層がシリカをさらに含むことを特徴とする請求項1~4のいずれかに記載のプロピレンの製造方法。
- 前記原料ガスが実質的に水蒸気を含まないことを特徴とする請求項1~5のいずれかに記載のプロピレンの製造方法。
- プロピレン合成工程後に、炭素数4以上のパラフィンおよびオレフィンを含む炭化水素分を反応生成物から分離して、これをプロピレン合成工程における希釈剤としてリサイクル使用することを特徴とする請求項1~6のいずれかに記載のプロピレンの製造方法。
- 前記希釈剤である炭素数4~8の飽和炭化水素がペンタンであることを特徴とする請求項1~7のいずれかに記載のプロピレンの製造方法。
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