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Method for preparing styrene catalyst by ethyl benzene dehydrogenation

A catalyst technology for the dehydrogenation of ethylbenzene, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., and can solve the problems of long induction period and low initial catalyst activity , to achieve the effect of improving initial activity, strong oxygen mobility and increasing activity

Active Publication Date: 2012-11-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is the problem of low initial catalyst activity and long induction period in the prior art, and a new preparation method for a catalyst for ethylbenzene dehydrogenation to styrene is provided

Method used

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  • Method for preparing styrene catalyst by ethyl benzene dehydrogenation
  • Method for preparing styrene catalyst by ethyl benzene dehydrogenation
  • Method for preparing styrene catalyst by ethyl benzene dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 261.0 grams of iron oxide red, 151.0 grams of iron oxide yellow, 70.0 grams of potassium carbonate, 74.1 grams of cerium nitrate, 8.2 grams of ammonium tungstate, 8.8 grams of magnesium oxide, 4.0 grams of calcium oxide, 4.0 grams of graphite, 10.6 grams of carboxymethyl cellulose Stir in a kneader for 1 hour, add deionized water, and stir for another half an hour, take out the extruded strips, extrude them into particles with a diameter of 3 mm and a length of 5-10 mm, put them in an oven, bake at 50°C for 2 hours, and bake at 100°C for 10 Hours, then placed in a muffle furnace, roasted at 800 ° C for 4 hours to obtain a semi-finished catalyst. Weigh 1.64 g of cerium nitrate and dissolve it in 55.0 ml of water, soak 200.0 g of semi-finished catalyst in this solution for 2 hours, then bake at 80°C for 12 hours, then bake at 350°C for 24 hours to obtain the finished catalyst.

[0018] 100 milliliters of finished catalysts are loaded into the reactor, under normal pressur...

Embodiment 2

[0020] 253.0 grams of iron oxide red, 100.0 grams of iron oxide yellow, 60.0 grams of potassium carbonate, 81.0 grams of cerium oxalate, 11.2 grams of ammonium molybdate, 15.5 grams of magnesium oxide, 11.8 grams of calcium carbonate, 2.0 grams of polystyrene microspheres, 16.5 grams of carboxylate Stir the methyl cellulose in a kneader for 1 hour, add deionized water, and stir for another half an hour, take out the extruded strips, extrude them into granules with a diameter of 3 mm and a length of 5-10 mm, put them in an oven, and bake at 50 ° C for 6 hours. Then it was placed in a muffle furnace and calcined at 650° C. for 12 hours to obtain a semi-finished catalyst. Weigh 3.84 g of cerium nitrate and dissolve it in 40.0 ml of water, soak 150.0 g of semi-finished catalyst in this solution for 10 hours, then bake at 120°C for 6 hours, then bake at 500°C for 6 hours to obtain the finished catalyst.

[0021] Activity evaluation was carried out according to the evaluation condit...

Embodiment 3

[0023] 213.0 grams of iron oxide red, 90.0 grams of iron oxide yellow, 73.0 grams of potassium carbonate, 76.5 grams of cerium oxalate, 16.3 grams of ammonium molybdate, 9.8 grams of magnesium oxide, 5.0 grams of calcium carbonate, 5.0 grams of hydroxyethyl cellulose, 20.3 grams of carboxylate Stir the methyl cellulose in a kneader for 1 hour, add deionized water, and stir for another half an hour, take out the extruded strips, extrude them into granules with a diameter of 3 mm and a length of 5-10 mm, put them in an oven, and bake at 50 ° C for 2 hours. Baked at 100°C for 10 hours, then placed in a muffle furnace, and fired at 1000°C for 0.5 hour to obtain a semi-finished catalyst. Weigh 6.32 grams of cerium nitrate and dissolve it in 40.0 milliliters of water, soak 150.0 grams of semi-finished catalyst in this solution for 16 hours, then bake at 130°C for 3 hours, then bake at 560°C for 5 hours to obtain the finished catalyst.

[0024] Activity evaluation was carried out acc...

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Abstract

The invention relates to a method for preparing a styrene catalyst by ethyl benzene dehydrogenation, which mainly solves the problems of low initial activity and long induction period of the catalyst in the prior art. The method comprises the following steps of: mixing a required amount of cerium source, a required amount of iron source, potassium source, molybdenum source or tungsten source and mixture thereof, alkaline earth metal oxide and pore forming agent uniformly, and molding, drying and roasting to obtain a catalyst precursor I; and carrying the rest cerium source on the catalyst precursor I by adopting a dipping method, and drying and roasting to obtain the required catalyst. According to the technical scheme, the problems are well solved, and the method can be used for industrial production of preparing the styrene by ethyl benzene dehydrogenation.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for preparing styrene from ethylbenzene dehydrogenation. Background technique [0002] At present, the basic composition of the catalyst for preparing styrene from ethylbenzene dehydrogenation in industry includes main catalyst, co-catalyst, pore forming agent and binder. Early catalysts were Fe-K-Cr systems, such as published US Patent 4467046 and European Patent 0296285A1. Although this type of catalyst has good activity and stability, it has been phased out gradually because the catalyst contains Cr oxides and causes certain pollution to the environment. Later, it evolved into Fe-K-Ce-Mo series, replacing Cr with Ce, which can better improve the activity and stability of the catalyst, and at the same time overcome the disadvantages of high toxicity and environmental pollution of Cr. The addition of Ce can greatly increase the activity of the catalyst, such as published US patents 4804799,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J37/00B01J37/04B01J37/02B01J23/887B01J23/888C07C15/46C07C5/333
Inventor 危春玲缪长喜宋磊陈铜倪军平
Owner CHINA PETROLEUM & CHEM CORP
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