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Catalyst for preparing cinnamene through ethyl benzene dehydrogenation

A technology for dehydrogenation of ethylbenzene and styrene, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, hydrocarbons, etc., can solve the problems of poor low temperature performance of catalysts and high energy consumption

Active Publication Date: 2008-08-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 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 catalyst for the dehydrogenation of ethylbenzene to prepare styrene is provided

Method used

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  • Catalyst for preparing cinnamene through ethyl benzene dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 0.1 g weight percent composition as 0.4%Pd / 5%CeO 2 / 20%Cr 2 O 3 / 74.6%Al 2 O 3 The catalyst was loaded into a stainless steel reactor with a diameter of 5 mm, and the temperature was programmed to 500 °C at a heating rate of 20 °C / min. 2 Pretreatment under the atmosphere for 2 hours, ethylbenzene was vaporized by a saturated steam generator, and then mixed with CO 2 Mixed to form feed gas into the catalyst bed for reaction. The reaction was carried out at 500 °C, the pressure was normal pressure, CO 2 The molar ratio to ethylbenzene is 20:1, the flow rate of ethylbenzene is 0.42 mmol / h, and the catalyst composition and dehydrogenation performance are listed in Table 1 and Table 2, respectively.

Embodiment 2～8

[0019] According to the various steps of Example 1, it is only to change the type and weight percentage of precious metals in the catalyst composition, the type and weight content of transition metal oxides, the weight content of chromium oxide and the weight content of alumina, the weight percentage composition of the gained catalyst, The dehydrogenation performance and stability under carbon dioxide atmosphere are shown in Table 1, Table 2, and Table 3, respectively.

[0020] The weight percent composition of the catalyst in table 1

[0021]

[0022] Table 2 Dehydrogenation performance of catalysts in carbon dioxide atmosphere

[0023] Conversion rate%

Selectivity %

Example 1

74.6

98.6

Example 2

69.9

99.1

Example 3

70.4

98.8

Example 4

74.2

98.0

Example 5

73.1

98.8

Example 6

74.1

98.9

Example 7

74.4

...

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Abstract

A catalyst for dehydrogenating ethylbenzene to prepare styrene with low energy consumption and high low-temp performance is prepared from noble metal or its oxide, the oxide of transition metal, chromium oxide and aluminum oxide.

Description

technical field [0001] The invention relates to a catalyst for preparing styrene by dehydrogenation of ethylbenzene. Background technique [0002] Styrene is an important organic chemical raw material and is widely used in the production of plastics, resins and synthetic rubber. It is the fourth largest ethylene derivative product after PE, PVC and EO, and the output of styrene series resin ranks third only after PE and PVC among synthetic resins. At present, the world's annual production capacity of styrene reaches 22 million tons, and the domestic production capacity is also about 900,000 tons per year. [0003] At present, more than 90% of styrene in the world is produced by catalytic dehydrogenation of ethylbenzene. Adopt steam as dehydrogenation medium in the production process, as USP6177602,5689023 and Chinese patent CN01802428.9, CN98116743.8 report the effect of steam is: (1) make reaction raw material heated to required temperature; (2) Supplement heat to avoid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/652B01J23/656C07C5/333C07C15/46
CPCY02P20/52
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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