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Catalyst for methyl ethylbenzene dehydrogenation to prepare alpha methyl styrene

A methyl styrene and catalyst technology, applied in the fields of hydrocarbons, hydrocarbons, organic chemistry, etc., can solve the problems of poor stability and activity, easy carbon deposition of catalysts, etc., achieve uniform dispersion, improve electron transfer ability, The effect of high catalytic activity

Inactive Publication Date: 2012-05-23
TONGJI UNIV
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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 under the condition of low water ratio in the prior art, the dehydrogenation catalyst of methyl ethyl benzene is easy to deposit carbon, and the problem of poor stability and activity is provided. Catalyst for styrene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Mix 190 grams of iron oxide red, 95 grams of iron oxide yellow, 74 grams of anhydrous potassium carbonate, 0.7 grams of titanium oxide, 1.8 grams of zinc oxide, 2.5 grams of ammonium molybdate, 35 grams of cement, 24.5 grams of sage powder, 98 grams Cerium nitrate, 39.2 grams of magnesium nitrate, 3.0 grams of lanthanum nitrate, and 32.2 grams of copper nitrate were dissolved in 165 grams of deionized water and added to the above mixture. The wet material was kneaded to a dough-like substance suitable for extrusion, extruded, diced, and aged at room temperature After 24 hours, it was placed in an oven, dried at 80°C for 4 hours, placed in a muffle furnace, and calcined at 800°C for 3 hours to obtain a finished catalyst.

[0032] Put 10 ml of catalyst into the reactor, under normal pressure, liquid space velocity 1.0h -1 , Reaction temperature of 620°C and 635°C, and water ratio (weight) of 1.6:1 for activity evaluation. Test results: The conversion rate of methyl ethyl...

Embodiment 2

[0034] 190 grams of iron oxide red, 95 grams of iron oxide yellow, 84 grams of anhydrous potassium carbonate, 1.3 grams of titanium oxide, 1.8 grams of zinc oxide, 4 grams of ammonium molybdate, 35 grams of cement, 24.5 grams of scallop powder, 102 grams of cerium nitrate , 41.3 gram of magnesium nitrate, 2.8 gram of lanthanum nitrate, 32.2 gram of copper nitrate mix homogeneously, add 170 gram of deionized water, the wet material is kneaded to the dough-like thing that is suitable for extrusion, prepare and test by the method for example 1. Test results: The conversion rate of methyl ethyl benzene at 620°C is 70.9%, and the selectivity is 93.2%, and the conversion rate of methyl ethyl benzene at 635°C is 72.6%, and the selectivity is 92.9%.

Embodiment 3

[0036] Mix 190 grams of iron oxide red, 95 grams of iron oxide yellow, 74 grams of anhydrous potassium carbonate, 1.8 grams of titanium oxide, 4 grams of ammonium molybdate, 35 grams of cement, 32 grams of cement, 24.5 grams of turmeric powder, and 91 grams of nitric acid Cerium, 39.2 grams of magnesium nitrate, 2.8 grams of lanthanum nitrate, and 32.2 grams of copper nitrate were dissolved in 170 grams of deionized water and added to the mixture, prepared and tested according to the method of example 1. Test results: The conversion rate of methyl ethyl benzene at 620°C is 70.6%, and the selectivity is 92.8%, and the conversion rate of methyl ethyl benzene at 635°C is 71.3%, and the selectivity is 92.0%.

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PUM

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Abstract

The invention relates to a catalyst for methyl ethylbenzene dehydrogenation to prepare alpha methyl styrene, which mainly solves the problems of poor activity, unstable activity and the like of a catalyst under a low water ratio in the prior art. The catalyst is a compound prepared by adding at least two of Ca, Mo, Zn, Mg, Cu and Ti and simultaneously adding a rare-earth element except for Ce into a Fe-K-Ce system. By adopting the technical scheme, the problems of poor activity and unstable activity of the catalyst under the low water ratio are solved well. The catalyst can be used for industrial production of the alpha methyl styrene synthesized by the methyl ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to a methyl ethyl benzene dehydrogenation catalyst, in particular to a methyl ethyl benzene dehydrogenation catalyst suitable for use under the operating condition of relatively low water-to-oil ratio. Background technique [0002] The basic composition of methyl ethyl benzene dehydrogenation catalyst is main catalyst, co-catalyst, porogen and reinforcing agent. Early methyl ethyl benzene dehydrogenation catalysts were mainly Fe-K-Cr series catalysts. Since this type of catalyst contains Cr element, its treatment after discarding is more complicated and pollutes the environment more, so it has been replaced by Fe-K-Ce catalyst. Compared with the former, Fe-K-Ce series catalysts have higher activity, longer catalyst life, generally about 2 years, and are more environmentally friendly. [0003] The dehydrogenation reaction of methyl ethyl benzene generally adopts negative pressure operating conditions to promote the reaction, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/887C07C15/46C07C5/333
CPCY02P20/52
Inventor 朱志荣梁铮
Owner TONGJI UNIV