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Ethylbenzene dehydrogenation catalyst with low vapor to ethylbenzene ratio, and preparation method and application thereof

An ethylbenzene dehydrogenation and catalyst technology, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical elements of heterogeneous catalysts, etc., can solve the problems of low activity, poor stability of low potassium catalysts, etc. question

Pending Publication Date: 2020-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is the problem of poor stability and low activity of low-potassium catalysts in the prior art under low water ratio conditions, and a new catalyst for preparing styrene by dehydrogenation of ethylbenzene is provided. The catalyst used in the dehydrogenation of ethylbenzene has the characteristics of good stability and high activity under the condition of low water ratio

Method used

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  • Ethylbenzene dehydrogenation catalyst with low vapor to ethylbenzene ratio, and preparation method and application thereof
  • Ethylbenzene dehydrogenation catalyst with low vapor to ethylbenzene ratio, and preparation method and application thereof
  • Ethylbenzene dehydrogenation catalyst with low vapor to ethylbenzene ratio, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] would be equivalent to 58.28 parts Fe 2 o 3 Iron oxide red, equivalent to 18.17 parts of Fe 2 o 3 Iron oxide yellow, equivalent to 7.8 parts K 2 Potassium carbonate of O, equivalent to 7.21 parts of CeO 2 of cerium oxalate, equivalent to 2.58 parts of WO 3 ammonium tungstate, magnesium carbonate equivalent to 1.12 parts of MgO, equivalent to 3.16 parts of Na 2 Sodium carbonate of O, 1.68 parts Pm 2 o 3 and 5.69 parts of sodium carboxymethylcellulose were stirred in a kneader for 1.5 hours, added deionized water accounting for 25% of the total weight of the catalyst raw material, stirred for 0.5 hour, took out the extruded strips, and extruded into particles with a diameter of 3 mm and a length of 6 mm. Put it into an oven, bake at 90°C for 2 hours, and bake at 150°C for 3 hours, then place it in a muffle furnace, and bake it at 650°C for 3 hours, then at 920°C for 3 hours to obtain the finished catalyst. The catalyst composition is listed in Table 1.

[0045] 10...

Embodiment 2

[0053] In addition to using Tb 2 o 3 instead of Pm 2 o 3 Except, catalyst preparation method and catalyst evaluation conditions are all identical with embodiment 1, specifically:

[0054] would be equivalent to 58.28 parts Fe 2 o 3 Iron oxide red, equivalent to 18.17 parts of Fe 2 o 3 Iron oxide yellow, equivalent to 7.8 parts K 2 Potassium carbonate of O, equivalent to 7.21 parts of CeO 2 of cerium oxalate, equivalent to 2.58 parts of WO 3 ammonium tungstate, magnesium carbonate equivalent to 1.12 parts of MgO, equivalent to 3.16 parts of Na 2 Sodium carbonate of O, 1.68 parts Tb 2 o 3 and 5.69 parts of sodium carboxymethylcellulose were stirred in a kneader for 1.5 hours, added deionized water accounting for 25% of the total weight of the catalyst raw material, stirred for 0.5 hour, took out the extruded strips, and extruded into particles with a diameter of 3 mm and a length of 6 mm. Put it into an oven, bake at 90°C for 2 hours, and bake at 150°C for 3 hours, t...

Embodiment 3

[0059] In addition to using Ho 2 o 3 instead of Pm 2 o 3 Except, catalyst preparation method and catalyst evaluation conditions are all identical with embodiment 1, specifically:

[0060] would be equivalent to 58.28 parts Fe 2 o 3 Iron oxide red, equivalent to 18.17 parts of Fe 2 o 3 Iron oxide yellow, equivalent to 7.8 parts K 2 Potassium carbonate of O, equivalent to 7.21 parts of CeO 2 of cerium oxalate, equivalent to 2.58 parts of WO 3 ammonium tungstate, magnesium carbonate equivalent to 1.12 parts of MgO, equivalent to 3.16 parts of Na 2 Sodium carbonate of O, 1.68 parts of Ho 2 o 3 and 5.69 parts of sodium carboxymethylcellulose were stirred in a kneader for 1.5 hours, added deionized water accounting for 25% of the total weight of the catalyst raw material, stirred for 0.5 hour, took out the extruded strips, and extruded into particles with a diameter of 3 mm and a length of 6 mm. Put it into an oven, bake at 90°C for 2 hours, and bake at 150°C for 3 hours...

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Abstract

The invention relates to an ethylbenzene dehydrogenation catalyst with a low vapor to ethylbenzene ratio, and a preparation method and application thereof. The problem that in the prior art, a low-potassium catalyst has poor stability and low activity under the condition of low vapor to ethylbenzene ratio is mainly solved. By adopting the technical scheme that the ethylbenzene dehydrogenation catalyst with the low vapor to ethylbenzene ratio is prepared from the following components in percentage by weight: 66% to 79% of Fe2O3, 4% to 8% of K2O, 6% to11% of CeO2, 1% to 5% of WO3, 0.5% to 5% ofMgO, 0.5% to 8% Na2O, and 0.5% to 5% of heavy rare earth oxide, and the heavy rare earth oxide is selected from one or more of Pm2O3, Tb2O3 or Ho2O3, the problem is solved well, and the ethylbenzene dehydrogenation catalyst with the low vapor to ethylbenzene ratio can be used in industrial production of styrene preparation from ethylbenzene dehydrogenation under the condition of low vapor to ethylbenzene ratio.

Description

technical field [0001] The invention relates to a catalyst for producing styrene by dehydrogenation of ethylbenzene with a low water ratio, a preparation method and application. Background technique [0002] The main reaction for the dehydrogenation of ethylbenzene is C 6 h 5 -C 2 h 5 →C 6 h 5 CH=CH 2 +H 2 +124KJ / mol. From a thermodynamic point of view, reducing the partial pressure of ethylbenzene is beneficial to the balance, so water vapor is usually added in industry to promote the reaction to move toward the product. The latest development trend of ethylbenzene dehydrogenation to styrene technology is to reduce raw material consumption and improve energy efficiency. The latent heat of vaporization of water is very large, and the styrene production process consumes a large amount of superheated steam as the dehydrogenation medium, which makes the process consume a lot of energy and the production cost remains high. It is an urgent need for styrene plants, espec...

Claims

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Application Information

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IPC IPC(8): B01J23/888C07C15/46C07C5/333
CPCB01J23/888B01J23/002C07C5/3332B01J2523/00
Inventor 宋磊缪长喜朱敏徐永繁
Owner CHINA PETROLEUM & CHEM CORP