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Method for preparing phenethylene through dehydrogenation of ethyl benzene

A technology for dehydrogenation of ethylbenzene and styrene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of poor low temperature performance of catalysts and large energy consumption of water vapor diluents.

Active Publication Date: 2007-02-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the energy consumption of water vapor diluent is large or the use of CO 2 The low-temperature performance of the catalyst is poor when used as a diluent, and a new method for preparing styrene from ethylbenzene dehydrogenation is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Composition of 0.1 g weight of 20% Cr 2 o 3 / 80%Al 2 o 3 The catalyst is loaded into a stainless steel reactor with a diameter of 5 mm, and the temperature is programmed to 500 ° C at a heating rate of 20 ° C / min. 2 Under the atmosphere pretreatment for 2 hours, ethylbenzene was vaporized by a saturated steam generator, and then mixed with CO 2 Mixed to form raw material gas enters the catalyst bed layer for reaction. The reaction was carried out at 500 ° C, the pressure was normal pressure, CO 2 The molar ratio with ethylbenzene is 20:1, and the ethylbenzene flow rate is 0.42 mmol / hour, and its weight composition and investigation performance are shown in Table 1 and Table 2.

Embodiment 2～4

[0019] Prepare and evaluate catalyst by each steps and condition of embodiment 1, just change Cr 2 o 3 and Al 2 o 3 Component content, weight percent composition of catalyst, dehydrogenation performance and catalyst stability under carbon dioxide atmosphere are shown in Table 1 and Table 2 respectively.

[0020]

[0021] Example

Embodiment 5

[0023] Composition of 0.1 gram weight percent as 5% CeO 2 / 20%Cr2 o 3 / 75%Al 2 o 3 The catalyst was loaded into a stainless steel reactor with a diameter of 5 mm, the temperature was programmed to 500 ° C, and the heating rate was 20 ° C / min. The catalyst was in N 2 Under the atmosphere pretreatment for 2 hours, ethylbenzene was vaporized by a saturated steam generator, and then mixed with CO 2 Mixed to form raw material gas enters the catalyst bed layer for reaction. The reaction was carried out at 500 ° C, the pressure was normal pressure, CO 2 The molar ratio with ethylbenzene is 20:1, and the ethylbenzene flow rate is 0.42 mmol / hour, and its weight composition, evaluation results and performance are shown in Table 3, Table 4 and Table 5.

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Abstract

This invention relates to a method for preparing styrene by ethyl benzene dehydrogenation. Styrene is prepared at 450-550 deg.C, normal pressure, space velocity of 0.1-1.0h-1, and CO2 / ethyl benzene mol ratio of (10-30): 1 in the presence of Cr2O3 / Al2O3 catalyst. The method solves the problems of high energy consumption by steam diluter, or low catalyst performance at low temperatures caused by CO2 diluter. The method can be used for manufacture of styrene by ethyl benzene dehydrogenation.

Description

technical field [0001] The invention relates to a method for preparing styrene by dehydrogenating ethylbenzene. Background technique [0002] Styrene is an important organic chemical raw material widely used in the production of plastics, resins and synthetic rubber. It is the fourth largest ethylene derivative product next to PE, PVC, and EO. In recent years, the demand has continued to increase (at a rate of 3-4%). Demand in 2004 is expected to exceed 2.1×10 8 Ton. In the past 7 years, my country has introduced 8 sets and built 3 sets of styrene production equipment with domestic technology, with an annual production capacity of about 900,000 tons. After China's accession to WTO, the price competition of world chemical products is fierce. Therefore, develop new technological processes and reduce costs. It is of great significance to improve the economic benefits of petrochemical enterprises. [0003] Industrial styrene production methods i...

Claims

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Application Information

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IPC IPC(8): C07C15/46C07C5/333
Inventor 缪长喜谢在库张惠明叶兴南华伟明乐英红高滋
Owner CHINA PETROLEUM & CHEM CORP
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