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Method for preparing styrene employing ethylbenzene dehydrogenation

A technology for the dehydrogenation of ethylbenzene and styrene, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., and can solve the problems of low initial catalyst activity and long induction period

Inactive Publication Date: 2014-03-26
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 method for preparing styrene by dehydrogenation of ethylbenzene, the initial activity of the catalyst is low and the induction period is long, and a new method for preparing styrene by dehydrogenation of ethylbenzene is provided

Method used

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  • Method for preparing styrene employing ethylbenzene dehydrogenation
  • Method for preparing styrene employing ethylbenzene dehydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 261.5 grams of iron oxide red, 152.0 grams of iron oxide yellow, 70.0 grams of potassium carbonate, 76.8 grams of cerium oxalate, 10.2 grams of ammonium molybdate, 4.0 grams of magnesium oxide, 4.0 grams of graphite, and 10.6 grams of carboxymethyl cellulose were stirred in a kneader For 1 hour, dissolve 6.3 grams of cerium ammonium nitrate in an appropriate amount of deionized water, then add it to the kneader, 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 to 10 mm, and put them in the oven , baked at 50°C for 2 hours, baked at 100°C for 10 hours, then placed in a muffle furnace, calcined at 200°C for 8 hours, and then calcined at 600°C for 20 hours to obtain the finished catalyst.

[0028] 100 milliliters of finished catalysts are loaded into the reactor, under normal pressure and liquid space velocity for 1.0 hours －1 , 620°C, and water vapor / ethylbenzene (weight ratio) 2.0 for a...

Embodiment 2

[0031] 253.1 grams of iron oxide red, 100.0 grams of iron oxide yellow, 65.0 grams of potassium carbonate, 75.0 grams of cerium oxalate, 11.5 grams of ammonium tungstate, 11.3 grams of ammonium molybdate, 15.5 grams of magnesium oxide, 11.8 grams of calcium carbonate, 2.0 grams of polystyrene Microspheres and 16.5 grams of carboxymethyl cellulose were stirred in a kneader for 1 hour, 13.0 grams of ammonium cerium nitrate was dissolved in an appropriate amount of deionized water, then added to the kneader, stirred for another half an hour, taken out and extruded into Particles with a diameter of 3 mm and a length of 5 to 10 mm were put into an oven, baked at 50°C for 6 hours, then placed in a muffle furnace, calcined at 300°C for 4 hours, and then calcined at 800°C for 10 hours to obtain a finished catalyst.

[0032] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 2.

[0033]

Embodiment 3

[0035] 213.0 grams of iron oxide red, 90.0 grams of iron oxide yellow, 70.0 grams of potassium carbonate, 73.0 grams of cerium oxalate, 16.3 grams of ammonium molybdate, 5.0 grams of calcium hydroxide, 9.8 grams of magnesium oxide, 5.0 grams of hydroxyethyl cellulose and 20.3 grams Stir carboxymethyl cellulose in a kneader for 1 hour, dissolve 20.0 grams of ammonium cerium nitrate in an appropriate amount of deionized water, then add it to the kneader, and stir for another half an hour, take out the extrusion, and extrude it into a diameter of 3 mm and a length of The particles of 5-10 mm are placed in an oven, baked at 50°C for 2 hours, and baked at 100°C for 10 hours, then placed in a muffle furnace, calcined at 350°C for 4 hours, and then calcined at 820°C for 5 hours to obtain a finished catalyst.

[0036] Activity evaluation was carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 2.

[0037]

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Abstract

The invention relates to a method for preparing styrene employing ethylbenzene dehydrogenation, and mainly solves the problems of low initial activity and long induction period of a catalyst in the prior art. The method adopts the technical scheme as follows: a cerium source adopts ceric ammonium nitrate and cerous oxalate as raw materials and then the raw materials are added to the catalyst according to the required ratio in an iron-potassium-cerium-molybdenum or tungsten catalyst system, and meanwhile, the catalyst obtained from a cerium active component by adopting a mode of leading to the catalyst employing a sub-step method is applied to preparation of styrene employing ethylbenzene dehydrogenation, so that the problem is well solved, and the method can be applied to industrial production of styrene preparation employing ethylbenzene dehydrogenation.

Description

technical field [0001] The invention relates to a method for preparing styrene by dehydrogenating ethylbenzene. Background technique [0002] Styrene is an important intermediate that can be used to prepare plastics and rubber, and is widely used in the production of polystyrene, acrylonitrile-styrene-butadiene (ABS), styrene-acrylonitrile (SAN) and styrene-butadiene Diene rubber (SBR). At present, more than 85% of styrene in the world is produced by the dehydrogenation process of ethylbenzene, which generally uses iron-based catalysts with iron oxide as the main active component and potassium oxide as the main co-catalyst. [0003] At present, the process technology of ethylbenzene dehydrogenation to prepare styrene is quite mature, and the catalyst becomes one of the keys to increase production and efficiency without changing any equipment and increasing investment. Early catalysts were Fe-K-Cr systems, such as published US Patent 4467046 and European Patent 0296285A1. ...

Claims

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Application Information

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IPC IPC(8): C07C15/46C07C5/333B01J23/888B01J23/887
Inventor 危春玲缪长喜宋磊徐永繁朱敏
Owner CHINA PETROLEUM & CHEM CORP
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