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Method of preparing tetramethyl ethylene by isobutene disproportionation

A technology of tetramethyl ethylene and isobutylene, applied in the field of isobutylene disproportionation to prepare tetramethyl ethylene, can solve problems such as low yield of target product, and achieve the effects of improving selectivity and yield and achieving good technical effect

Active Publication Date: 2015-06-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of low yield of the target product existing in the prior art, and a new method for preparing tetramethylethylene by disproportionation of isobutene is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 500 grams of commercial MgO, add 2.5 liters of deionized water, heat and stir the resulting white turbid solution at 80°C for 5 hours, filter the water in the solution with suction, and dry the product at 120°C for 6 hours to obtain a magnesium oxide carrier.

[0018] Mix 200 grams of carrier magnesia and 1% scallop powder and put them into the blender evenly. After stirring for 12 minutes, add 19 grams of ammonium metatungstate, then add 250 grams of deionized water, knead, extrude, and dry at 550 The catalyst was prepared by calcining at ℃ for 4 hours, which was designated as SL-1.

[0019] The evaluation of the catalyst was carried out on an olefin disproportionation evaluation device, and the raw material was 99.7% isobutene in terms of mass fraction. The reaction is at a temperature of 350°C, a pressure of 0.6MPa in absolute pressure, and a weight space velocity of isobutylene of 4.8 hours -1 The evaluation was carried out under the conditions, and the evalu...

Embodiment 2

[0021] Weigh 500 grams of commercial MgO, add 2 liters of deionized water, and heat and stir the obtained white turbid solution at 60°C for 4 hours, then let it stand for 2 hours, filter the water in the solution, and dry the product at 120°C for 4 hours to obtain the magnesium oxide carrier .

[0022] Mix 200 grams of carrier magnesia and 1% scallop powder and put them into the blender evenly. After stirring for 30 minutes, add 24 grams of ammonium metatungstate, then add 150 grams of deionized water, knead, extrude, and dry at 550 The catalyst was prepared by calcining at ℃ for 4 hours, which was designated as SL-2.

[0023] The evaluation of the catalyst is carried out on the olefin disproportionation evaluation device. The reaction is carried out at a temperature of 400°C, a pressure of 0.2 MPa in absolute pressure, and a weight space velocity of isobutylene of 10 hours. -1 The evaluation was carried out under the conditions, and the evaluation results are shown in Table ...

Embodiment 3

[0025] Weigh 500 grams of commercial MgO, add 1.5 liters of deionized water, and heat and stir the obtained white turbid solution at 100°C for 2 hours, then let it stand for 2 hours, filter the water in the solution, and dry the product at 100°C for 8 hours to obtain a magnesium oxide carrier .

[0026] Mix 200 grams of carrier magnesia and 1% scallop powder and put them into the blender evenly. After stirring for 20 minutes, add 48 grams of ammonium metatungstate, then add 180 grams of deionized water, knead, extrude, and dry at 550 The catalyst was prepared by calcining at ℃ for 4 hours, which was designated as SL-3.

[0027] The evaluation of the catalyst was carried out on the olefin disproportionation evaluation device. The reaction was carried out at a temperature of 370°C, a pressure of 0.8 MPa in absolute pressure, and a weight space velocity of isobutylene of 2 hours. -1 The evaluation was carried out under the conditions, and the evaluation results are shown in Tabl...

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Abstract

The invention relates to a method of preparing tetramethyl ethylene by isobutene disproportionation, and is mainly used for solving a problem that target product yield is low in the prior art. By adopting a technical scheme that isobutene is used as a material to contact with a catalyst to react in a fixed bed reactor to generate effluent containing tetramethyl ethylene under conditions of reaction temperature of 350 DEG C-450 DEG C, reaction pressure of 0.2MPa-0.8MPa in terms of absolute pressure and weight space velocity of 2-20 per hour, wherein the used catalyst comprises the following components in parts by weight: (a), 5-50 parts of tungsten oxide; (b), 50-95 parts of magnesium oxide carrier, the problem is solved better. The method can be used for industrial production of preparing tetramethyl ethylene by isobutene disproportionation.

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. At present, the conventional production method of tetramethylethylene in industry is to generate through propylene dimerization, 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-added tetramethylethylene. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C6/04C07C11/107B01J23/30
Inventor 王仰东宣东
Owner CHINA PETROLEUM & CHEM CORP