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Peoxygenation catalyst for preparing alkyl olefine arene

A technology for dehydrogenation catalysts and alkenyl aromatics, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve the problems of low yield and low selectivity

Inactive Publication Date: 2004-05-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of low selectivity and low yield of alkenyl aromatics in the previous literature, and provide a new dehydrogenation catalyst for the preparation of alkenyl aromatics

Method used

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  • Peoxygenation catalyst for preparing alkyl olefine arene
  • Peoxygenation catalyst for preparing alkyl olefine arene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix 226.8 grams of iron oxide red, 168.4 grams of iron oxide yellow, 81.8 grams of potassium carbonate, 85.0 grams of cerium nitrate, 10.1 grams of molybdenum oxide, 6.2 grams of aluminum oxide, 16.1 grams of magnesium oxide, 0.75 grams of strontium oxide, 30.0 grams of cement, and 20.0 grams of carboxylate. Stir the methyl cellulose in a kneader for 1 hour, add deionized water, and mix for another half an hour. Take out the extruded bar and squeeze it into granules with a diameter of 3 mm and a length of 5-8 mm. Place them in an oven and bake at 80°C for 2 It was baked for 2 hours at 120°C for 2 hours, then placed in a roasting furnace and roasted at 900°C for 4 hours to prepare the catalyst. The evaluation results are shown in Table 1.

[0030] Catalyst composition (wt%)

[0031] Fe 2 O 3 75.52

[0032] K 2 O 11.12

[0033] Ce 2 O 3 6.73

[0034] MoO 3 ...

Embodiment 2

[0039] The preparation of the catalyst was the same as in Example 1, except that the amount of strontium oxide added was changed to 1.0 g.

[0040] Catalyst composition (wt%)

[0041] Fe 2 O 3 75.48

[0042] K 2 O 11.12

[0043] Ce 2 O3 6.72

[0044] MoO 3 2.02

[0045] Al 2 O 3 1.24

[0046] MgO 3.22

[0047] SrO 0.20

Embodiment 3

[0067] The catalysts prepared in Examples 1 to 2 and Comparative Examples 1 to 2 were evaluated in a 1" stainless steel isothermal fixed bed reactor. The evaluation conditions were reaction temperature of 620°C, reaction pressure of normal pressure, and liquid space velocity of 1.0 hour -1 , The water ratio (water / ethylbenzene) is 2.0 (weight ratio), and the evaluation results are shown in Table 1. In addition, the reaction temperature of the catalyst of Example 2 is 640°C, the reaction pressure is normal pressure, and the liquid space velocity is 6.0 hours. -1 , The water / ethylbenzene (weight) ratio is evaluated under the condition of 1.60, and the evaluation results are shown in Table 2.

[0068] Table 1 Dehydrogenation product distribution of each catalyst

[0069] Product distribution% Ethylbenzene conversion rate Styrene selectivity

[0070] catalyst

[0071] Benzene Toluene Ethylbenzene Styrene%%

[0072] Example 1 1.57 2.39 24....

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Abstract

The present invention relates to a dehydrogenation catalyst for preparing alkylolefine aromatic hydrocarbon, and is mainly aimed at solving the problems of low selectivity and low yield in the previous technology. Said ivnention adopts the technical scheme of adding strontium component in the ion-potassium-cerium-molybdenum catalytic system so as to solve said problems better. Said invention can be used in industrial production of alkylolefine aromatic hydrocarbon.

Description

Technical field [0001] The invention relates to a dehydrogenation catalyst for preparing alkenyl aromatic hydrocarbons, in particular to a catalyst for preparing styrene, divinylbenzene or α-methylstyrene. Background technique [0002] Industrial production of alkenyl aromatic hydrocarbons is achieved through dehydrogenation of alkyl aromatic hydrocarbons. The basic composition of the catalyst used is the main catalyst, co-catalyst, porogen, enhancer and so on. The catalysts reported in the patent can be divided into two categories. One type is Fe-K series catalysts containing Cr, such as published US patents US4467046, US4684619 and European patent EP0195252A 2 Wait. Although this type of catalyst has good activity and stability, because of the presence of Cr oxides in the composition more or less, the preparation, operation and treatment of spent catalysts will cause certain environmental pollution and have been gradually eliminated. The other is th...

Claims

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Application Information

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IPC IPC(8): B01J23/881C07C5/333C07C15/46
Inventor 缪长喜单明毛连生杨城
Owner CHINA PETROLEUM & CHEM CORP