Catalyst for preparing styrene by dehydrogenizing ethylbenzene and preparation method thereof

A technology for ethylbenzene dehydrogenation and ethylbenzene dehydrogenation, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of insufficient mechanical strength and stability of catalysts To avoid problems such as decreased performance, achieve high activity and selectivity, high mechanical strength, and improve the effect of alkalinity

Active Publication Date: 2011-03-30
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 grams of iron oxide red, 80.0 grams of iron oxide yellow, 60.0 grams of potassium carbonate, 88.0 grams of cerium oxalate, 7.2 grams of cerium carbonate, 10.0 grams of ammonium molybdate, 9.6 grams of magnesium oxide and 20.5 grams of carboxymethyl cellulose in a kneader Stir for 1 hour, add deionized water, stir for another half an hour, take out the extruded strips, extrude them into particles with a diameter of 3 mm and a length of 5 to 10 mm, put them in an oven, bake at 80°C for 2 hours, and at 120°C for 2 hours, then place In a muffle furnace, calcined 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] 100 milliliters of catalysts are loaded into the reactor, at normal pressure, liquid space velocity 1.0 hours -1 , 620°C, water vapor / ethylbenzene (weight ratio) 2.0 conditions for activity evaluation, the test results are listed in Table...

Embodiment 2

[0028] 210.0 grams of iron oxide red, 183.0 grams of iron oxide yellow, 52.0 grams of potassium carbonate, 82.0 grams of cerium oxalate, 9.5 grams of cerium carbonate, 5.1 grams of ammonium molybdate, 6.5 grams of magnesium oxide, 8.0 grams of calcium carbonate and 2.0 grams of polystyrene Balls, 16.5 grams of carboxymethyl cellulose were stirred in a kneader for 1 hour, added deionized water, and stirred for another half an hour, took out the extruded strips, extruded into granules with a diameter of 3 mm and a length of 5 to 10 mm, and put them into an oven at 120 ℃ for 2 hours, then placed in a muffle furnace, and calcined at 650 ℃ for 14 hours to obtain the finished catalyst.

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

Embodiment 3

[0031] 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, 20.3 grams of carboxymethyl The base cellulose was stirred in a kneader for 1 hour, added deionized water, and stirred for another half an hour, took out the extruded strands, extruded into granules with a diameter of 3 mm and a length of 5 to 10 mm, put them in an oven, and baked them at 50 ° C for 12 hours, then Put it in a muffle furnace and bake it at 1000°C for 0.5 hour to obtain the finished catalyst.

[0032] Activity evaluation and mechanical strength determination were carried out according to the evaluation conditions of Example 1, and 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 preparing styrene by dehydrogenating ethylbenzene and a preparation method thereof. Background technique [0002] At present, the basic composition of the catalyst for preparing styrene from ethylbenzene dehydrogenation in industry includes main catalyst, co-catalyst, pore forming agent and binder. Early catalysts were Fe-K-Cr systems, such as published US Patent 4467046 and European Patent 0296285A1. Although this type of catalyst has good activity and stability, it has been phased out gradually because the catalyst contains Cr oxides and causes certain pollution to the environment. Later, it evolved into 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 high toxicity and environmental pollution of Cr. Then develop to be the catalyst of Fe-K-Ce-Mo-Mg series, as disclosed EP502510, WO9710898, CN1233604...

Claims

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Application Information

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