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Catalyst for preparing styrene by dehydrogenizing ethylbenzene and preparation method thereof

A technology for ethylbenzene dehydrogenation production and ethylbenzene dehydrogenation, which is applied in catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. Insufficient and high problems, to achieve high mechanical strength, high activity and selectivity, and the effect of improving alkalinity

Active Publication Date: 2013-06-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] One of the technical problems to be solved by this invention is that in the preparation of styrene catalyst of ethylbenzene dehydrogenation of literature in the past, use low potassium catalyst (K 2 (O is less than 16%), under the situation of not adding ordinary calcium silicate cement, the mechanical strength of catalyst is not high enough, thereby causes the problem that stability declines, provides a kind of new catalyst that is used for ethylbenzene dehydrogenation and prepares styrene

Method used

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  • Catalyst for preparing styrene by dehydrogenizing ethylbenzene and preparation method thereof
  • Catalyst for preparing styrene by dehydrogenizing ethylbenzene and preparation method thereof
  • Catalyst for preparing styrene by dehydrogenizing ethylbenzene and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 212.0 g of iron oxide red, 80.0 g of iron oxide yellow, 60.0 g of potassium carbonate, 88.0 g of cerium oxalate, 7.2 g of cerium carbonate, 10.0 g of ammonium molybdate, 9.6 g of magnesium oxide and 20.5 g of carboxymethyl cellulose in a kneader Stir for 1 hour, add deionized water, mix for another half an hour, take out the extruded bar, squeeze into pellets with a diameter of 3 mm and a length of 5-10 mm, put them in an oven, bake at 80°C for 2 hours, 120°C for 2 hours, and set Calcined in a muffle furnace at 850°C for 4 hours to obtain the finished catalyst.

[0025] The mechanical strength of the catalyst was measured, and the test results are listed in Table 1.

[0026] Load 100 ml of catalyst into the reactor, at normal pressure, liquid space velocity for 1.0 hour -1 The activity evaluation was conducted under the conditions of, 620°C and water vapor / ethylbenzene (weight ratio) 2.0. The test results are listed in Table 1.

Embodiment 2

[0028] Combine 210.0 g iron oxide red, 183.0 g iron oxide yellow, 52.0 g potassium carbonate, 82.0 g cerium oxalate, 9.5 g cerium carbonate, 5.1 g ammonium molybdate, 6.5 g magnesium oxide, 8.0 g calcium carbonate and 2.0 g polystyrene micro Balls and 16.5 g of carboxymethyl cellulose were stirred in a kneader for 1 hour, added with deionized water, and mixed for another half an hour. Take out the extruded bar and squeeze it into pellets with a diameter of 3 mm and a length of 5-10 mm, and put them in an oven, 120 Bake at ℃ for 2 hours, then place it in a muffle furnace and calcinate at 650℃ for 14 hours to obtain the finished catalyst.

[0029] The activity evaluation and mechanical strength measurement were carried out according to the evaluation conditions of Example 1. The test results are listed in Table 1.

Embodiment 3

[0031] Combine 282.0 grams of iron oxide red, 103.5 grams of iron oxide yellow, 75.0 grams of potassium carbonate, 72.0 grams of cerium oxalate, 15.0 grams of cerium carbonate, 10.5 grams of ammonium molybdate, 6.0 grams of magnesium oxide, 7.0 grams of hydroxyethyl cellulose, and 20.3 grams of carboxymethyl The base cellulose was stirred in a kneader for 1 hour, added with deionized water, and mixed for another half an hour. The extruded rod was taken out and extruded into granules with a diameter of 3 mm and a length of 5-10 mm. They were put into an oven and dried at 50°C for 12 hours. Placed in a muffle furnace and calcined at 1000°C for 0.5 hours to obtain a finished catalyst.

[0032] The activity evaluation and mechanical strength measurement were carried out according to the evaluation conditions of Example 1. The test results are listed in Table 1.

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Abstract

The invention relates to a catalyst for preparing styrene by dehydrogenizing ethylbenzene and a preparation method thereof, mainly solving the technical problem that the low mechanical strength of a low-potassium catalyst causes the reduction of the catalyst stability under the condition of not adding ordinary calcium silicate cement in the prior art. In the invention, a cerium source, an iron source, a potassium source, a molybdenum source, an alkaline earth metallic oxide and a hole forming agent with required quantities are selected in an iron-potassium-cerium-molybdenum-magnesium catalystsystem and uniformly mixing; and molding, drying and roasting to prepare a catalyst, wherein the technical scheme of adopting cerium oxalate and cerium carbonate as raw materials of the cerium sourceand adding the cerium source to the catalyst better solves the problem. The invention can be applied to the industrial production of preparing the styrene by dehydrogenizing the ethylbenzene.

Description

Technical field [0001] The invention relates to a catalyst for the dehydrogenation of ethylbenzene to prepare styrene and a preparation method thereof. Background technique [0002] At present, the basic composition of the catalyst for preparing styrene by dehydrogenation of ethylbenzene in industry includes main catalyst, co-catalyst, pore former and binder. The early catalysts were Fe-K-Cr systems, such as the published US Patent 4,467,046 and European Patent 0296285A1. Although this type of catalyst has better activity and stability, it has been gradually eliminated because the catalyst contains Cr oxide, which causes certain pollution to the environment. Later evolved into the Fe-K-Ce-Mo series, replacing Cr with Ce, which can better improve the activity and stability of the catalyst, and at the same time overcome the disadvantages of Cr that is highly toxic and pollute the environment. Then developed to Fe-K-Ce-Mo-Mg series of catalysts, such as published EP502510, WO97108...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887B01J37/08C07C15/46C07C5/333
CPCY02P20/52
Inventor 危春玲缪长喜陈铜宋磊朱敏
Owner CHINA PETROLEUM & CHEM CORP
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