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Method for preparing tetramethylethylene through isobutene metathesis

A technology of tetramethylethylene and isobutylene, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of low yield of tetramethylethylene, low catalyst activity, low reaction space velocity, etc. The effect of increasing the rate, increasing the specific surface area, and improving the disproportionation activity

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is the problems of low catalyst activity, low reaction space velocity and low yield of tetramethylethylene in the product existing in the prior art, and a new method for producing tetramethylethylene by disproportionation of isobutylene is provided

Method used

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  • Method for preparing tetramethylethylene through isobutene metathesis
  • Method for preparing tetramethylethylene through isobutene metathesis
  • Method for preparing tetramethylethylene through isobutene metathesis

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Embodiment 1

[0022] Add 1 kg of 700-mesh chromatographic silica gel and 10 g of scallop powder into the mixer and stir for 45 minutes. After kneading evenly, add 400 g of silica sol and 63 g of ammonium metatungstate, and add 1 kg of deionized water at the same time, knead and extrude , dried, and then calcined at 550° C. for 4 hours to obtain a light yellow finished catalyst with a content of 5% tungsten oxide. The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device, and the raw material was 99.9% isobutene. The reaction is at a temperature of 385 °C, a pressure of 0.5 MPa, and a space velocity of butene-1 of 4 hours -1 The evaluation is carried out under the condition of the above, and the evaluation results are shown in Table 2, which is recorded as SL-1.

Embodiment 2

[0024] According to each step in embodiment 1, only change the ammonium metatungstate to be 113 grams, the loading capacity of the catalyst tungsten oxide that makes is 8%, change the reaction temperature in the reaction condition to be 350 ℃, reaction pressure be 0.2MPa and space velocity for 1 hour -1 , the evaluation results are shown in Table 2, recorded as SL-2.

Embodiment 3

[0026] According to each step in embodiment 1, only change the ammonium metatungstate to be 163 grams, the loading capacity of the prepared catalyst tungsten oxide is 12%, change the reaction temperature in the reaction conditions to be 370 ℃, the reaction pressure to be 0.4MPa and the space velocity for 2 hours -1 , the evaluation results are shown in Table 1, recorded as SL-3.

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Abstract

The invention relates to a method for preparing tetramethylethylene through isobutene metathesis, and mainly aims to solve the problem of low catalyst activity in previous technologies. The method of the invention adopts isobutene as the raw material, in a fixed bed reactor, at a temperature of 350-450DEG C, under a reaction pressure of 0-1MPa and a weight space velocity of 1-20h<-1>, the raw material is contacted with a catalyst for reaction so as to generate tetramethylethylene, i.e. an effluent of 2, 3-dimethyl-2-butylene. Specifically, the catalyst consists of by weight: 1-30 parts of tungsten oxide and 70-99 parts of an SiO2 vector, and the specific surface area of the catalyst is 250-500m<2> / g. The technical method of the invention well solves the above, and can be used in the industrial tetramethylethylene production through isobutene metathesis.

Description

technical field [0001] The invention relates to a method for preparing tetramethylethylene by disproportionation of isobutene. Background technique [0002] As a high value-added olefin product, tetramethylethylene can be used as an intermediate of pesticides and spices, and is the main raw material for the synthesis of chrysanthemic acid. At the same time, it is also used in the production of spices and other agricultural chemicals, especially in the production of tuna musk spices by replacing neohexene, which has the advantages of low cost and stable product quality. The synthesis of tetramethylethylene has received much attention. Tetramethylethylene is 2,3-dimethyl-2-butene. At present, the conventional production method of hexene in industry is to generate by dimerization of propylene, and the catalyst used is a homogeneous complex catalyst. Through olefin disproportionation technology, relatively excess low-value-added C4 olefins can be converted into high-value-adde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/107C07C2/00B01J23/30
CPCY02P20/52
Inventor 宣东王仰东刘苏
Owner CHINA PETROLEUM & CHEM CORP
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