Method for manufacturing olefin

A manufacturing method and technology of olefins, applied in the field of olefins manufacturing, capable of solving problems such as performance degradation

Inactive Publication Date: 2012-02-22
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] However, little is known about methods for suppressing performance degradation of isomerization catalysts in the production process of olefins using metathesis catalysts and isomerization catalysts

Method used

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  • Method for manufacturing olefin
  • Method for manufacturing olefin
  • Method for manufacturing olefin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0197] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited thereto.

[0198] [Catalyst preparation]

[0199] (Preparation Example 1-1) Preparation of Metathesis Catalyst WQ-15

[0200] In SiO 2 After the carrier (Fuji Silysia, CARiACT Q-15) was impregnated with ammonium metatungstate, it was fired at 500°C in an air atmosphere to obtain WO 3 / SiO 2 catalyst. The catalyst obtained by pulverizing and classifying the catalyst into a size of 150 to 500 μm was designated as WQ-15.

preparation example 1-2

[0201] (Preparation Example 1-2) Preparation 1 of an isomerization catalyst containing Mg and Y

[0202] The isomerization catalyst containing Mg and Y is prepared by changing the molar ratio of the metal nitrate used to prepare a catalyst with Mg / Y molar ratio = 0.1, 0.5, 1, 3, 5 or 7.

[0203] A mixed aqueous solution of magnesium nitrate and yttrium nitrate and 25% aqueous ammonia were prepared, and the solution was sent to a flask filled with water and mixed. At this time, the liquid delivery speed of ammonia water was controlled so that the pH of the liquid in the flask was maintained at 10. After mixing, add appropriate amount of ammonia water until the pH of the liquid in the flask does not change any more, and perform aging. The resulting precipitate was repeatedly filtered and redispersed in water to be washed. After drying the obtained wet cake, it fired at 550 degreeC in air atmosphere, and obtained the metal oxide containing Mg and Y. It was made into powder, th...

preparation example 1-3

[0205] (Preparation Example 1-3) Preparation 2 of an isomerization catalyst containing Mg and Y

[0206] A mixed aqueous solution of magnesium nitrate and yttrium nitrate and an aqueous sodium hydroxide solution were prepared. Next, water in which carbonate ions were dissolved in sodium carbonate in an equimolar amount with respect to the yttrium salt was prepared in the flask, and the nitrate aqueous solution and the sodium hydroxide aqueous solution were mixed while feeding the solution while keeping the temperature at 60°C. At this time, the liquid feeding rate of the sodium hydroxide aqueous solution was controlled so that the pH of the liquid in the flask was maintained at 10. After the mixing was completed, heating was further performed, and aging was carried out under reflux for 2 hours. The resulting precipitate was repeatedly filtered and redispersed in water to be washed. After drying the obtained wet cake, it fired at 550 degreeC in air atmosphere, and obtained th...

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Abstract

Disclosed is a process for producing an olefin, in which the double bond isomerization of starting material olefins can be promoted to inhibit a metathesis reaction, which is a side reaction, thereby increasing the selectivity for the desired product. Also disclosed is a process for producing an olefin, in which the activity of a metathesis catalyst can be maintained for a long period and the deterioration in performance of a catalyst for promoting the double bond isomerization of the starting material olefins (i.e., an isomerization catalyst) can be prevented, thereby producing the desired product with high productivity and high efficiency. Specifically disclosed is a process for producing an olefin, which comprises reacting the same types or different types of raw material olefins with each other to produce an olefin having a different structure from those of the starting material olefins, which is characterized by using both a catalyst comprising at least one metal element selected from tungsten, molybdenum and rhenium and another specific catalyst.

Description

technical field [0001] The present invention relates to a method for producing olefins utilizing a metathesis reaction between olefins of the same type or different types. Background technique [0002] The metathesis reaction of olefins of the same or different types to react with each other to obtain olefins of different structures, for example, can convert ethylene, propylene, and butenes produced in a certain proportion from a naphtha cracking unit, corresponding to the required structure change of olefins, Hence the huge benefits. [0003] Among them, particularly in a metathesis reaction using an internal olefin as a raw material, it is known to use a double bond isomerization catalyst of an olefin in combination with a metathesis catalyst. [0004] For example, in the process of producing propylene from ethylene and n-butene, and in the process of producing neohexene from 2,4,4-trimethylpentene and ethylene, an oxidation catalyst having double bond isomerization activ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C6/04B01J23/10B01J23/30C07C11/06C07B61/00C07C5/25
CPCB01J23/002B01J23/007B01J23/02B01J23/10B01J23/24B01J23/30B01J23/36B01J35/0006B01J35/1014B01J37/0009B01J2523/00C07C5/2512C07C6/04C07C2521/04C07C2521/08C07C2523/10C07C2523/28C07C2523/30C07C2523/36Y02P20/52B01J2523/22B01J2523/31B01J2523/36C07C11/06C07C11/08C07C5/25
Inventor 宫添智池永裕一小谷诚
Owner MITSUI CHEM INC
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