WO2017191794A1 - 共役ジエンの製造方法 - Google Patents
共役ジエンの製造方法 Download PDFInfo
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- WO2017191794A1 WO2017191794A1 PCT/JP2017/016567 JP2017016567W WO2017191794A1 WO 2017191794 A1 WO2017191794 A1 WO 2017191794A1 JP 2017016567 W JP2017016567 W JP 2017016567W WO 2017191794 A1 WO2017191794 A1 WO 2017191794A1
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- conjugated diene
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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
- C07C1/24—Preparation of hydrocarbons from one or more compounds, none of them being a hydrocarbon starting from organic compounds containing only oxygen atoms as heteroatoms by elimination of water
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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
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
- B01J21/066—Zirconium or hafnium; Oxides or hydroxides thereof
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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
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0201—Impregnation
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C11/00—Aliphatic unsaturated hydrocarbons
- C07C11/12—Alkadienes
- C07C11/173—Alkadienes with five carbon atoms
- C07C11/18—Isoprene
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B61/00—Other general methods
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2521/00—Catalysts comprising the elements, oxides or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium or hafnium
- C07C2521/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2527/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- C07C2527/02—Sulfur, selenium or tellurium; Compounds thereof
- C07C2527/053—Sulfates or other compounds comprising the anion (SnO3n+1)2-
Definitions
- the present invention relates to a method for producing a conjugated diene. More specifically, the present invention relates to a method for producing a conjugated diene by dehydration of ⁇ , ⁇ -unsaturated alcohol.
- a method for producing conjugated dienes by dehydration of ⁇ , ⁇ -unsaturated alcohol, a method of vapor phase dehydration of 3-methyl-3-buten-1-ol in the presence of a catalyst in which phosphoric acid is supported on pumice and calcium phosphate Is known (see Patent Documents 1 and 2). These methods have problems such as that a large amount of heat source must be used to vaporize the raw material, and that the produced conjugated diene is polymerized on the catalyst surface in a high temperature environment and the catalytic activity is reduced. It was.
- Patent Document 3 discloses a method of reacting isoprene monool or the like under liquid phase pressure at a reaction temperature of 100 to 180 ° C. in the presence of a homogeneous acid catalyst.
- this method it is necessary to treat the acid waste liquid from the viewpoint of environmental protection, and the process becomes complicated.
- Patent Document 4 describes a method of dehydrating 3-methyl-3-buten-1-ol to obtain isoprene in the presence of a molybdenum catalyst.
- the yield by this method is still not sufficient, and further improvement is required.
- JP 47-1571 A Japanese Patent Publication No. 50-1003 Japanese Patent Laid-Open No. 47-14105 U.S. Pat. No. 4,053,536
- an object of the present invention is to provide a method capable of producing a conjugated diene with good yield under mild conditions for dehydration of ⁇ , ⁇ -unsaturated alcohol.
- the present invention provides the following [1] to [6].
- [1] A process for producing a conjugated diene comprising a step of dehydrating a ⁇ , ⁇ -unsaturated alcohol in the presence of a solid acid catalyst having a Hammett acidity function (H 0 ) of ⁇ 12.2 or less.
- the production method of [1], wherein the solid acid catalyst is a sulfuric acid-supported metal oxide or a tungstic acid-supported metal oxide.
- [4] The production method of [1], wherein the solid acid catalyst is sulfated zirconia.
- a conjugated diene can be produced in a good yield under mild conditions when dehydrating a ⁇ , ⁇ -unsaturated alcohol.
- the production method of the present invention includes a step of dehydrating ⁇ , ⁇ -unsaturated alcohol in the presence of a solid acid catalyst having a Hammett acidity function (H 0 ) of -12. 2 or less.
- the ⁇ , ⁇ -unsaturated alcohol used as a raw material in the production method of the present invention is preferably one represented by the following general formula (I) (hereinafter referred to as ⁇ , ⁇ -unsaturated alcohol (I)).
- R 1 , R 2 and R 3 each independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. R 1 and R 3 may be linked to each other to form a ring. .
- alkyl group having 1 to 10 carbon atoms independently represented by R 1 , R 2 and R 3 examples include a methyl group, an ethyl group, and various propyl groups (“various” means a linear group and any branched chain) And the like), various butyl groups, various hexyl groups, various octyl groups, various decyl groups, and the like. Of these, an alkyl group having 1 to 5 carbon atoms is preferable, an alkyl group having 1 to 3 carbon atoms is more preferable, and a methyl group is more preferable.
- a ring having 5 to 10 carbon atoms such as a cyclopentene ring, a cyclohexene ring and a cyclooctene ring is preferable, and a cyclohexene ring is more preferable.
- R 1, R 2 and R 3, at least one of R 1 and R 2 are hydrogen atoms, and preferably R 3 is an alkyl group having 1 to 10 carbon hydrogen or C, R 1 More preferably, R 2 and R 2 are both hydrogen atoms, and R 3 is a hydrogen atom or an alkyl group having 1 to 10 carbon atoms.
- Preferred alkyl groups are as described above.
- ⁇ , ⁇ -unsaturated alcohol (I) include the following. (1) 3-buten-1-ol in which R 1 , R 2 and R 3 are all hydrogen atoms, (2) 3-methyl-3-buten-1-ol as an example in which R 1 and R 2 are hydrogen atoms and R 3 is an alkyl group having 1 to 10 carbon atoms, (3) 3-methyl-3-penten-1-ol and 3-methyl- as examples in which one of R 1 and R 2 is a hydrogen atom and R 3 is an alkyl group having 1 to 10 carbon atoms 3-hexen-1-ol, (4) 3,4-dimethyl-3-penten-1-ol and 3,4-dimethyl-3-hexene as examples in which R 1 , R 2 and R 3 are all alkyl groups having 1 to 10 carbon atoms -1-all, (5) Cyclohexene-1-ethanol as an example in which R 2 is a hydrogen atom and R 1 and R 3 are connected to each other to form a ring. Of these,
- the solid acid catalyst used in the production method of the present invention has a Hammett acidity function (H 0 ) of ⁇ 12.2 or less.
- H 0 Hammett acidity function
- A is a Lewis acid point.
- H 0 pK a + log ([B] / [AB])
- the value of H 0 can be determined by, for example, an amine titration method.
- an acid catalyst having H 0 of ⁇ 12.2 or less the reactivity is improved and a conjugated diene can be produced in a high yield.
- a solid catalyst it is possible to suppress the corrosion of the apparatus and the generation of acidic waste liquid, and it becomes easy to separate, recover, recycle and reuse the catalyst from the reaction system.
- an oxo acid-supported metal oxide is preferable.
- it is preferable to use a solid acid catalyst having H 0 ⁇ 20.0 or more.
- the solid acid catalyst has a BET specific surface area of 20 to 800 m 2 / g as a nitrogen adsorption specific surface area measured according to “Method for measuring specific surface area of powder (solid) by gas adsorption” described in JIS Z8830: 2001. It is preferably 25 to 600 m 2 / g, more preferably 50 to 500 m 2 / g.
- BET specific surface area is in the above range, sufficient catalytic activity can be obtained, and the selectivity of the conjugated diene is improved.
- the solid acid catalyst may be used after aging. By using an aged solid acid catalyst, high catalytic activity can be exhibited.
- the aging time is usually 0.5 to 5 hours, preferably 1 to 3 hours.
- the aging temperature is usually 100 to 300 ° C, preferably 130 to 150 ° C. If the temperature is too low, the catalyst tends not to be sufficiently dried. If the temperature is too high, an unexpected change in the catalyst structure may occur, which is undesirable.
- the production method of the present invention can be carried out in the absence of a solvent, but is preferably carried out in the presence of a solvent.
- a solvent for example, aliphatic hydrocarbons such as octane, nonane, decane, kerosene and liquid paraffin; aromatic hydrocarbons such as xylene, toluene and high-boiling aromatics are preferable, and aliphatic hydrocarbons are more preferable.
- the amount of solvent used in the reaction system is preferably 80 to 99% by mass, more preferably 85 to 97.5% by mass, and still more preferably 90 to 95% by mass.
- the amount of solvent used in the reaction system is in the range of 80 to 99% by mass, the load on the stirring device is suppressed. Further, the formation of high-boiling byproducts can be suppressed, the conjugated diene selectivity can be increased, and the conversion rate of ⁇ , ⁇ -unsaturated alcohol can be maintained high.
- the solvent is usually charged into the reactor before the reaction is started and is in the above range.
- the amount of the solid acid catalyst present in the reaction system is preferably 1 to 20% by mass, more preferably 2.5 to 15% by mass, and further preferably 5 to 10% by mass. This amount can be adjusted by, for example, the amount of solvent used. If the amount of the solid acid catalyst in the reaction system is in the range of 1 to 20% by mass, the formation of high-boiling by-products can be suppressed, the selectivity of the conjugated diene can be increased, and the ⁇ , ⁇ -unsaturated alcohol can be increased. The conversion rate of can be kept high. In addition, it is preferable that the solid acid catalyst is usually charged into the reactor before the reaction is started and the amount thereof is set.
- the reaction temperature is preferably 100 to 210 ° C., more preferably 115 to 200 ° C., and further preferably 120 to 190 ° C.
- the temperature is 100 ° C. or higher, a sufficiently high reaction rate can be obtained, and a conjugated diene can be obtained with high selectivity.
- it is 210 degrees C or less, since the side reaction of the produced
- the reaction pressure is preferably 0.05 to 2.0 MPa, more preferably 0.075 to 1.5 MPa, and further preferably 0.09 to 1.0 MPa. . If the reaction pressure is less than 0.05 MPa, it may be difficult to obtain a sufficient reaction temperature.
- the reaction is preferably carried out in an atmosphere of an inert gas such as nitrogen or argon.
- a solid acid catalyst having a H 0 of ⁇ 12.2 or less and a solvent are charged, and a ⁇ , ⁇ -unsaturated alcohol is placed in a container at a predetermined temperature and pressure.
- a so-called reactive distillation manner in which the conjugated diene and water produced are continuously distilled out of the reaction system.
- the total amount of conjugated diene and water distilled from the reactor is the amount of ⁇ , ⁇ -unsaturated alcohol supplied per unit time to the reactor.
- the mass is preferably 0.8 to 1.2 times, more preferably 0.9 to 1.1 times.
- Example 1 2.
- reference catalyst JRC-SZ-1, H 0 ⁇ 16.1, BET specific surface area 67.0 m 2 / g
- the conversion of 3-methyl-3-buten-1-ol was 88.6%, and the selectivity for isoprene was 67.9%.
- the selectivity of by-product isobutene is 0.8%
- the selectivity of 1,1-dimethyl-2-propen-1-ol is 8.6%
- the selectivity of ⁇ -methyldihydropyran is 0.8.
- the selectivity of 5% and isoprene dimer was 1.2%.
- Nafion registered trademark
- ⁇ Comparative example 2> The same operation as in Example 1 was performed except that the catalyst was changed to 3.1 g of ⁇ -alumina (“E30N4” manufactured by JGC Catalysts & Chemicals, H 0 ⁇ ⁇ 5.5, BET specific surface area 186 m 2 / g). No reaction was observed, and no isoprene formation was observed. When the reaction solution in the reactor was analyzed, the conversion of 3-methyl-3-buten-1-ol was 23.7%.
- ⁇ -alumina ⁇ -alumina
- the target conjugated diene could be produced in a high yield even under mild conditions.
- the conjugated diene obtained by the production method of the present invention is useful as various chemicals and polymer raw materials.
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Abstract
Description
[1]ハメットの酸度関数(H0)が-12.2以下の固体酸触媒の存在下、γ,δ-不飽和アルコールを脱水させる工程を含む共役ジエンの製造方法。
[2]前記固体酸触媒がオキソ酸担持金属酸化物である、[1]の製造方法。
[3]前記固体酸触媒が硫酸担持金属酸化物またはタングステン酸担持金属酸化物である、[1]の製造方法。
[4]前記固体酸触媒が硫酸化ジルコニアである、[1]の製造方法。
[5]溶媒を共存させる、[1]~[4]のいずれかの製造方法。
[6]前記溶媒が脂肪族炭化水素である、[5]の製造方法。
[7]前記γ,δ-不飽和アルコールが3-メチル-3-ブテン-1-オールである、[1]~[6]のいずれかの製造方法。
R1、R2およびR3がそれぞれ独立して表す炭素数1~10のアルキル基としては、例えばメチル基、エチル基、各種プロピル基(「各種」とは、直鎖状基およびあらゆる分岐鎖状基を含むことを示す。以下同様)、各種ブチル基、各種ヘキシル基、各種オクチル基、各種デシル基などが挙げられる。中でも炭素数1~5のアルキル基が好ましく、炭素数1~3のアルキル基がより好ましく、メチル基がさらに好ましい。
(1)R1、R2およびR3がいずれも水素原子である3-ブテン-1-オール、
(2)R1およびR2が水素原子でありかつR3が炭素数1~10のアルキル基である例としての3-メチル-3-ブテン-1-オール、
(3)R1およびR2のうちの一方が水素原子でありかつR3が炭素数1~10のアルキル基である例としての3-メチル-3-ペンテン-1-オールおよび3-メチル-3-ヘキセン-1-オール、
(4)R1、R2およびR3がいずれも炭素数1~10のアルキル基である例としての3,4-ジメチル-3-ペンテン-1-オールおよび3,4-ジメチル-3-ヘキセン-1-オール、
(5)R2が水素原子でありかつR1とR3とが互いに連結して環を形成している例としてのシクロヘキセン-1-エタノール。
中でも、3-メチル-3-ブテン-1-オールが好ましい。
本発明の製造方法で用いる固体酸触媒は、ハメットの酸度関数(H0)が-12.2以下である。なお、ある酸塩基指示薬Bについて、塩基型をB、酸型をBH+とすると、酸のハメットの酸度関数は以下の式で定義され、例えば100%硫酸ではH0=-11.93となる。
H0=pKa+log([B]/[BH+])
なおルイス酸の場合は、Aをルイス酸点として以下の式で定義される。
H0=pKa+log([B]/[AB])
本発明の製造方法ではH0が-12.2以下である酸触媒を用いることにより、反応性が向上し、高い収率で共役ジエンを製造できる。また固体触媒を用いることにより、装置等の腐食や酸性廃液の発生を抑制できる上、反応系からの触媒の分離回収・再生・再使用が容易となる。
なお、入手性の観点から、H0=-20.0以上である固体酸触媒を用いることが好ましい。
本発明の製造方法は、溶媒の不存在下で行うこともできるが、溶媒を共存させて行うことが好ましい。用いる溶媒としては、例えばオクタン、ノナン、デカン、ケロシン、流動パラフィンなどの脂肪族炭化水素;キシレン、トルエン、高沸点芳香族類などの芳香族炭化水素などが好ましく、脂肪族炭化水素がより好ましい。溶媒存在下で反応させることにより、固体酸触媒への高沸点副生成物の付着を抑制し、触媒活性を高く維持することができる。
本発明の製造方法において、反応温度は100~210℃であることが好ましく、115~200℃であることがより好ましく、120~190℃であることがさらに好ましい。100℃以上であれば十分に高い反応速度が得られ、共役ジエンを高い選択率で得ることができる。また210℃以下であれば、生成した共役ジエンの副反応が抑制され収率向上に繋がるほか、熱源の使用量を抑制できることから経済的に有利である。
なお、各例において、ガスクロマトグラフィー分析は以下の条件にて実施した。
[ガスクロマトグラフィー分析条件]
分析機器:GC14A(株式会社島津製作所製)
検出器:FID(水素炎イオン化型検出器)
使用カラム:DB-1(30m,膜厚5μm)(J&W Scientific社製)
分析条件:注入口温度280℃、検出器温度280℃
昇温条件:40℃(10分保持)→(5℃/分で昇温)→250℃(4分保持)
冷却管を備えた100mL三口フラスコに撹拌子、流動パラフィン28.7g、硫酸化ジルコニア(参照触媒JRC-SZ-1、H0=-16.1、BET比表面積67.0m2/g)3.1gを入れ、系内を窒素置換した後に、大気圧下で加熱と撹拌(800rpm)を開始した。内温が130℃になってから1時間後、3-メチル-3-ブテン-1-オールを4.9g/時にて計29.3gフラスコ内へ供給し、反応蒸留形式で留出物を系外の50mLフラスコ受け器へ留出させ、27.4gの留出分を回収した。
反応物の留出が収まったところで、加熱を止め反応を停止させた。受け器の有機層および反応器内の反応液をガスクロマトグラフィーにより分析した結果、3-メチル-3-ブテン-1-オールの転化率は91.1%、イソプレンの選択率は81.9%であった。また、副生成物であるイソブテンの選択率は1.1%、1,1-ジメチル-2-プロペン-1-オールの選択率は10.7%、β-メチルジヒドロピランの選択率は0.4%、イソプレン二量体の選択率は0.3%であった。
実施例1において、触媒をタングステン酸ジルコニア(第一希元素化学工業株式会社製、H0=-14.6、BET比表面積52.5m2/g)3.1gに変更したこと以外は同様に操作を行った。3-メチル-3-ブテン-1-オールの転化率は88.6%、イソプレンの選択率は67.9%であった。また、副生成物であるイソブテンの選択率は0.8%、1,1-ジメチル-2-プロペン-1-オールの選択率は8.6%、β-メチルジヒドロピランの選択率は0.5%、イソプレン二量体の選択率は1.2%であった。
実施例1において、触媒をナフィオン(登録商標)(H0=-12.0、BET比表面積0.02m2/g以下)3.1gに変更したこと以外は同様に操作を行った。3-メチル-3-ブテン-1-オールの転化率は95.8%であり、イソプレンの選択率は27%であった。
実施例1において、触媒をγ-アルミナ(日揮触媒化成株式会社製「E30N4」、H0≧-5.5、BET比表面積186m2/g)3.1gに変更したこと以外は同様に操作を行ったが、反応物の留出は見られず、イソプレンの生成は観測されなかった。反応器内の反応液を分析したところ、3-メチル-3-ブテン-1-オールの転化率は23.7%であった。
Claims (7)
- ハメットの酸度関数(H0)が-12.2以下の固体酸触媒の存在下、γ,δ-不飽和アルコールを脱水させる工程を含む共役ジエンの製造方法。
- 前記固体酸触媒がオキソ酸担持金属酸化物である、請求項1に記載の製造方法。
- 前記固体酸触媒が硫酸担持金属酸化物またはタングステン酸担持金属酸化物である、請求項1に記載の製造方法。
- 前記固体酸触媒が硫酸化ジルコニアである、請求項1に記載の製造方法。
- 溶媒を共存させる、請求項1~4のいずれかに記載の製造方法。
- 前記溶媒が脂肪族炭化水素である、請求項5に記載の製造方法。
- 前記γ,δ-不飽和アルコールが3-メチル-3-ブテン-1-オールである、請求項1~6のいずれかに記載の製造方法。
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US16/098,727 US11319261B2 (en) | 2016-05-06 | 2017-04-26 | Method for producing conjugated diene |
JP2018515707A JP6892187B2 (ja) | 2016-05-06 | 2017-04-26 | 共役ジエンの製造方法 |
EP17792727.4A EP3453696B1 (en) | 2016-05-06 | 2017-04-26 | Method for producing conjugated diene |
KR1020187031732A KR102338451B1 (ko) | 2016-05-06 | 2017-04-26 | 공액 디엔의 제조 방법 |
RU2018138691A RU2734778C2 (ru) | 2016-05-06 | 2017-04-26 | Способ получения сопряженного диена |
CN201780027377.8A CN109071379A (zh) | 2016-05-06 | 2017-04-26 | 共轭二烯的制造方法 |
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Citations (11)
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JPS471571A (ja) | 1971-06-25 | 1972-01-26 | ||
JPS4714105A (ja) | 1971-01-12 | 1972-08-04 | ||
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US6448198B1 (en) * | 1997-10-13 | 2002-09-10 | Total Raffinage Distribution S.A. | Acid catalyst with a sulfated zirconia base and its uses |
FR2769519B1 (fr) * | 1997-10-13 | 1999-12-31 | Total Raffinage Distribution | Catalyseur acide a base de zircone sulfatee et ses utilisations |
RU2368593C1 (ru) * | 2008-05-13 | 2009-09-27 | Открытое акционерное общество "Нижнекамскнефтехим" | Способ выделения изобутилена |
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JP2013213028A (ja) * | 2012-03-07 | 2013-10-17 | Mitsubishi Chemicals Corp | 共役ジエンの製造方法 |
CN105152832A (zh) * | 2015-10-13 | 2015-12-16 | 宁波金海晨光化学股份有限公司 | 一种合成异戊二烯的工艺方法 |
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- 2017-04-26 CN CN201780027377.8A patent/CN109071379A/zh active Pending
- 2017-04-26 KR KR1020187031732A patent/KR102338451B1/ko active IP Right Grant
- 2017-04-26 RU RU2018138691A patent/RU2734778C2/ru active
- 2017-04-26 EP EP17792727.4A patent/EP3453696B1/en active Active
- 2017-04-26 WO PCT/JP2017/016567 patent/WO2017191794A1/ja unknown
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- 2017-04-26 JP JP2018515707A patent/JP6892187B2/ja active Active
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JPS501003B1 (ja) | 1969-06-06 | 1975-01-14 | ||
JPS4714105A (ja) | 1971-01-12 | 1972-08-04 | ||
JPS471571A (ja) | 1971-06-25 | 1972-01-26 | ||
JPS5236603A (en) * | 1975-09-16 | 1977-03-22 | Kuraray Co Ltd | Process for preparation of isoprene |
US4053536A (en) | 1976-05-25 | 1977-10-11 | Phillips Petroleum Company | Dehydration of olefinically unsaturated alcohols |
JPS596181B2 (ja) * | 1979-08-27 | 1984-02-09 | 日本鉱業株式会社 | 固体酸触媒 |
JPS57130928A (en) * | 1981-02-06 | 1982-08-13 | Nippon Zeon Co Ltd | Synthetic method of isoprene |
JPH01288339A (ja) * | 1988-05-13 | 1989-11-20 | Nippon Mining Co Ltd | 炭化水素転化用固体酸触媒及びその製造方法 |
JPH05293375A (ja) * | 1992-04-17 | 1993-11-09 | Japan Energy Corp | 固体超強酸触媒及びその製法 |
JP2013075877A (ja) * | 2011-09-30 | 2013-04-25 | Kuraray Co Ltd | イソプレンの製造方法 |
WO2016194983A1 (ja) * | 2015-06-03 | 2016-12-08 | 株式会社クラレ | 共役ジエンの製造方法 |
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US11319261B2 (en) | 2022-05-03 |
EP3453696A1 (en) | 2019-03-13 |
RU2018138691A3 (ja) | 2020-06-08 |
US20190135714A1 (en) | 2019-05-09 |
KR102338451B1 (ko) | 2021-12-10 |
CN109071379A (zh) | 2018-12-21 |
EP3453696A4 (en) | 2020-01-08 |
KR20190004279A (ko) | 2019-01-11 |
EP3453696B1 (en) | 2021-03-17 |
TW201806913A (zh) | 2018-03-01 |
JPWO2017191794A1 (ja) | 2019-03-07 |
JP6892187B2 (ja) | 2021-06-23 |
RU2018138691A (ru) | 2020-06-08 |
RU2734778C2 (ru) | 2020-10-23 |
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