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Catalyst for producing phenylethene by ethylbenzene dehydrogenation and its preparation method

A catalyst technology for the dehydrogenation of ethylbenzene, which is applied to catalysts with large specific surface area, high activity, and high strength, and can solve problems such as not specifying space velocity conditions

Active Publication Date: 2008-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1050535C provides with iron-potassium-molybdenum-magnesium-rare earth metal as main component, adds the catalyst of multiple metal oxides, and it has excellent conversion rate, selectivity, but does not point out the space velocity condition of evaluation (this processing condition is an important factor in evaluating catalyst performance)

Method used

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  • Catalyst for producing phenylethene by ethylbenzene dehydrogenation and its preparation method
  • Catalyst for producing phenylethene by ethylbenzene dehydrogenation and its preparation method
  • Catalyst for producing phenylethene by ethylbenzene dehydrogenation and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] [Example 1] 153g iron oxide red, 170g iron oxide yellow, 100g potassium carbonate, 13g ammonium molybdate, 16g magnesium oxide, 32g cement, 4.5g copper oxide, 1.8g lanthanum oxide, 4g safflower powder are added in the kneader After 2 hours of dry mixing, 85g of cerium nitrate was dissolved in deionized water and added to it, and kneaded for 2 hours to knead the material into an extrudable paste, then take it out, and go through the extruding and breaking processes to make Φ3 A cylindrical catalyst of ~3.3mm×5~8mm was dried at 90°C for 4 hours, placed in a muffle furnace for activation and calcined at 750°C for 10 hours, and then cooled naturally to obtain the catalyst of the present invention.

[0029] The activity of the catalyst was evaluated.

[0030] Put 100ml of catalyst into the isothermal furnace tube, and evaluate its effect under the conditions of 600°C, water-to-oil ratio 1.3, and space velocity 0.6, as shown in Table 1.

Embodiment 2

[0031] [Example 2] Prepare catalyst by Example 1, difference is to add 160g iron oxide red, 160g iron oxide yellow, 105g potassium carbonate, 5.5g cupric oxide, 2.1g lanthanum oxide. The evaluation results are shown in Table 1.

Embodiment 3

[0032] [Example 3] Catalyst was prepared according to Example 1, except that 5g of copper oxide, 2.0g of lanthanum oxide, and 2.5g of carbon black were added without adding safflower powder. The evaluation results are shown in Table 1.

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Abstract

The invention relates to a metnhod for using ethylbenzene dehydrogenation to prepare phenylethene catalyst. Wherein, its active components (mass percentage) are 63-85 ferric oxide, 6-15 burnt potash, 4-10 cerium oxide , 1-5 molybdena, 1-6 magnesia, 0.1-3 copper oxide, 0.1-0.8 lanthanum oxide, and 1-9 strengthening agent, the specific surface area is 3.5-5m<2 / g, the side pressure strength is higher than 25N / mm. Under constant-temperature normal-pressure evaluation as 600Deg. C reaction temperature, 0.6h<-1 liquid speed, and 1.3 oil / water ratio, the transform ratio is higher than 70%, the selectivity is higher than 94.5%. The inventive product can be used in diethyl benzene and methoxyphenethyl dehydrogenation to prepare diphenyl ethylene and methylstyrene.

Description

technical field [0001] The present invention relates to a kind of ethylbenzene dehydrogenation preparation styrene catalyst and preparation method thereof, especially a kind of catalyst suitable for 1.3 water-oil ratio (H 2 (O / ethylbenzene mass ratio) catalyst with high activity, high strength and large specific surface area. The catalyst can also be used for the dehydrogenation of diethylbenzene to produce divinylbenzene or the dehydrogenation of methylethylbenzene to produce methylstyrene. Background technique [0002] At present, the industrially used catalysts for the dehydrogenation of ethylbenzene to styrene are all iron-based catalysts. That is to say, iron oxide is used as the main active component, and additives such as alkali metal or alkaline earth metal, rare earth element are added, and it is made by dry blending, extruding and activating. The basic composition of ethylbenzene dehydrogenation styrene catalyst is developed from Fe-K-Cr, Fe-K-Ce-Mo to Fe-K-Ce-Mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887C07C5/333C07C15/46
Inventor 辛国萍王继龙谈敦礼黄德华
Owner PETROCHINA CO LTD