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Method for producing diethylbenzene through dehydrogenation of diethyl benzene

A divinylbenzene and diethylbenzene technology, applied in the field of diethylbenzene dehydrogenation to prepare divinylbenzene, can solve the problems of low yield of diethylbenzene dehydrogenation products, chromium pollution, etc., achieve high anti-coking ability, high The effect of selectivity, good technical effect

Active Publication Date: 2007-02-21
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 pollution of chromium in the catalyst to the environment and the low yield of diethylbenzene dehydrogenation products existing in the prior art, and a new method for preparing divinylbenzene by dehydrogenation of diethylbenzene is provided

Method used

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  • Method for producing diethylbenzene through dehydrogenation of diethyl benzene
  • Method for producing diethylbenzene through dehydrogenation of diethyl benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Combine 185 grams of iron oxide red, 120 grams of iron oxide yellow, 65 grams of potassium carbonate, 60 grams of cerium nitrate, 20 grams of praseodymium nitrate, 9.5 grams of ammonium molybdate, 30 grams of calcium oxalate, 2.1 grams of vanadium oxide, 2 grams of manganese oxide, 2.3 G tin oxide, 0.4 g boron oxide, 10 g carboxymethyl cellulose are mixed uniformly, 140 g deionized water is added, the wet material is kneaded into a dough suitable for extruding, extruding, cutting into pellets, and aging at room temperature for 10 hours. Put it into an oven, dry at 80°C for 6 hours, put it in a roasting furnace, and roast at 800°C for 2 hours to obtain a finished catalyst. Load 100 ml of catalyst into the evaluation reactor. At the reaction temperature of 620°C, the weight ratio of water / diethylbenzene is 2.0:1, the pressure is 50KPa, and the space velocity is 0.05 hours. -1 Catalytic activity is evaluated under the conditions, and the qualification rate of boiling water tes...

Embodiment 2

[0024] Load 100 ml of the catalyst of Example 1 into the evaluation reactor. At the reaction temperature of 580°C, the weight ratio of water / diethylbenzene is 4.5:1, the pressure is 30KPa, and the space velocity is 0.1 hour. -1 Catalytic activity is evaluated under the conditions, and the qualification rate of boiling water test and cold water test are determined. Test results: the conversion rate of diethylbenzene was 80.9%, the selectivity of stilbene was 52.0%, the selectivity of ethyl styrene was 34.1%, the boiling water test was qualified, and the cold water test was qualified.

Embodiment 3

[0026] Load 100 ml of the catalyst of Example 1 into the evaluation reactor at a reaction temperature of 640°C, a weight ratio of water / diethylbenzene of 3.0:1, normal pressure, and a space velocity of 0.3 hours. -1 Catalytic activity is evaluated under the conditions, and the qualification rate of boiling water test and cold water test are determined. Test results: the conversion rate of diethylbenzene is 80.6%, the selectivity of stilbene is 52.3%, the selectivity of ethyl styrene is 34.3%, the boiling water test is qualified, and the cold water test is qualified.

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Abstract

This invention relates to a method for preparing divinylbenzene by diethylbenzene dehydrogenation. The method uses Fe-K-Ce-Mo catalyst system, and keeps high catalytic selectivity and anti-carbon deposition ability by adjusting the ratio of the above elements as well as adding multiple rare earth compounds. The method has a high divinylbenzene yield, and can be used for divinylbenzene industrial manufacture.

Description

Technical field [0001] The invention relates to a method for preparing divinylbenzene by dehydrogenating diethylbenzene. Background technique [0002] Most of the catalysts used for the dehydrogenation of polyethylbenzene are the catalysts for the dehydrogenation of ethylbenzene to styrene, and the main components are generally Fe-K-Ce / Cr, such as patents ZL95111761.0, ZL98110739.7, and ZL99113572.5. ZL95111761.0 discloses a dehydrogenation catalyst for the production of alkenyl aromatic hydrocarbons, which is composed of iron-potassium-chromium system added with various metal oxides and silica sol. The prepared catalyst can be used for the dehydrogenation of ethylbenzene to prepare styrene, and also for the dehydrogenation of diethylbenzene to prepare divinylbenzene. When the catalyst is used for the dehydrogenation of ethylbenzene to produce styrene, the single yield of styrene is 73.9%, the conversion of ethylbenzene is 78.3%, and the selectivity of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C5/333
CPCY02P20/52
Inventor 毛连生范勤
Owner CHINA PETROLEUM & CHEM CORP
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