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Method for preparing styrene by dehydrogenation of ethylbenzene

A technology for ethylbenzene dehydrogenation and styrene, applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of decreased stability and insufficient mechanical strength of catalysts, and achieve high mechanical strength, high activity and high performance. Selectivity, the effect of increasing alkalinity

Active Publication Date: 2011-05-04
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 this invention is to use low potassium catalyst (K 2 O is less than 16%), under the situation of not adding ordinary calcium silicate cement, the mechanical strength of catalyst is not high enough, thereby causes the problem that stability declines, provides a kind of new method for preparing styrene by dehydrogenation of ethylbenzene

Method used

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  • Method for preparing styrene by dehydrogenation of ethylbenzene
  • Method for preparing styrene by dehydrogenation of ethylbenzene
  • Method for preparing styrene by dehydrogenation of ethylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 212.0 grams of iron oxide red, 80.0 grams of iron oxide yellow, 60.0 grams of potassium carbonate, 88.0 grams of cerium oxalate, 7.2 grams of cerium carbonate, 10.0 grams of ammonium molybdate, 9.6 grams of magnesium oxide and 20.5 grams of carboxymethyl cellulose in a kneader Stir for 1 hour, add deionized water, 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, put them in an oven, bake at 80°C for 2 hours, and at 120°C for 2 hours, then place In a muffle furnace, calcined at 850°C for 4 hours to obtain the finished catalyst.

[0028] The mechanical strength of the catalyst was measured, and the test results are listed in Table 1.

[0029] 100 milliliters of catalysts are loaded into the reactor, at normal pressure, liquid space velocity 1.0 hours -1 , 620°C, and water vapor / ethylbenzene (weight ratio) of 2.0 for activity evaluation, the test results are listed in Table 1. ...

Embodiment 2

[0031] Prepare catalyst by the method for embodiment 1, difference is 212.0 gram iron oxide red, 183.0 gram iron oxide yellow, 52.0 gram potassium carbonate, 82.0 gram cerium oxalate, 9.5 gram cerium carbonate, 5.1 gram ammonium molybdate, 6.5 gram magnesium oxide , 8.0 grams of calcium carbonate and 18.1 grams of carboxymethyl cellulose.

[0032] Activity evaluation and mechanical strength determination were carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.

Embodiment 3

[0034] The catalyst is prepared according to the method of Example 1, except that 282.0 grams of iron oxide red, 103.5 grams of iron oxide yellow, 75.0 grams of potassium carbonate, 72.0 grams of cerium oxalate, 15.0 grams of cerium carbonate, 10.5 grams of ammonium molybdate, 6.0 grams of oxide Magnesium and 20.0 g methylcellulose

[0035] Activity evaluation and mechanical strength determination were carried out according to the evaluation conditions of Example 1, and the test results are listed in Table 1.

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Abstract

The invention relates to a method for preparing styrene by dehydrogenation of ethylbenzene, and mainly solves the technical problem existing in the prior art that the mechanical strength of low potassium catalyst is low without the addition of common calcium silicate cements such that the stability decreases. According to the invention, ethylbenzene is adopted as a raw material, and styrene is prepared by contacting the raw material with a catalyst in a weight ratio of water vapor to ethylbenzene of 1.0-3.0 at normal pressure, a temperature of 580-640 DEG C, and a liquid space velocity of 0.5-2.0 h<-1>, wherein the catalyst used is the iron-potassium-cerium-molybdenum-magnesium catalyst and the mixture of cerium oxalate and cerium carbonate is adopted as a raw material for cerium source. The technical scheme solves the technical problem well and is applicable to the industrial production of preparing styrene by dehydrogenation of ethylbenzene.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C5/333B01J23/887
CPCY02P20/52
Inventor 危春玲缪长喜陈铜宋磊朱敏
Owner CHINA PETROLEUM & CHEM CORP
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