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Method for producing divinyl benzene by dehydrogenating diethylbenzene

A technology of divinylbenzene and diethylbenzene, which is applied in the field of diethylbenzene dehydrogenation to produce divinylbenzene, can solve the problems of high monodiene ratio and insufficient conversion rate of diethylbenzene, and achieve high conversion rate and good The effect of technical effects

Active Publication Date: 2020-04-24
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 when there is a long period of operation in the prior art, the conversion rate of diethylbenzene is not high enough and the ratio of monodiene is high. A new method for producing divinylbenzene by dehydrogenation of diethylbenzene

Method used

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  • Method for producing divinyl benzene by dehydrogenating diethylbenzene
  • Method for producing divinyl benzene by dehydrogenating diethylbenzene
  • Method for producing divinyl benzene by dehydrogenating diethylbenzene

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Effect test

Embodiment 1

[0044] Diethylbenzene and water are reacted with a dual-catalyst system in an isothermal bed reactor, wherein the upper layer is loaded with catalyst M for 65 milliliters, and the lower layer is filled with catalyst N for 35 milliliters. The reaction temperature is 600 ° C and the reaction pressure is normal pressure. Liquid space velocity is 0.5 hours －1 , The water vapor / diethylbenzene weight ratio was 3.0, and the catalyst system was purged with water vapor at 600° C. for 30 minutes before the reaction. The test results are listed in Table 1.

[0045] Wherein the preparation method of catalyst M is to be equivalent to 54.61 parts of Fe 2 o 3 Iron oxide red, equivalent to 18.20 parts Fe 2 o 3 Iron oxide yellow, equivalent to 9.80 parts K 2 Potassium carbonate of O, equivalent to 12.71 parts of CeO 2 of cerium oxalate, equivalent to 1.16 parts of MoO 3 ammonium molybdate, calcium carbonate equivalent to 1.35 parts of CaO, 0.02 parts of TiO 2 And 5.6 parts of sodium hyd...

Embodiment 2

[0053] Diethylbenzene and water are reacted with a dual-catalyst system in an isothermal bed reactor, wherein the upper layer is loaded with catalyst M for 65 milliliters, and the lower layer is filled with catalyst N for 35 milliliters. The reaction temperature is 600 ° C and the reaction pressure is normal pressure. Liquid space velocity is 0.5 hours －1 , The water vapor / diethylbenzene weight ratio was 3.0, and the catalyst system was purged with water vapor at 600° C. for 30 minutes before the reaction. The test results are listed in Table 1.

[0054] Wherein the preparation method of catalyst M is to be equivalent to 59.74 parts of Fe 2 o 3 Iron oxide red, equivalent to 14.94 parts of Fe 2 o 3 Iron oxide yellow, equivalent to 8.51 parts K 2 Potassium carbonate of O, equivalent to 10.62 parts of CeO 2 of cerium oxalate, equivalent to 1.25 parts MoO 3 Ammonium molybdate, calcium carbonate equivalent to 1.29 parts of CaO and 5.0 parts of sodium hydroxymethylcellulose we...

Embodiment 3

[0058] Diethylbenzene and water are reacted with a dual-catalyst system in an isothermal bed reactor, wherein the upper layer is loaded with catalyst M for 65 milliliters, and the lower layer is filled with catalyst N for 35 milliliters. The reaction temperature is 600 ° C and the reaction pressure is normal pressure. Liquid space velocity is 0.5 hours －1 , The water vapor / diethylbenzene weight ratio was 3.0, and the catalyst system was purged with water vapor at 600° C. for 30 minutes before the reaction. The test results are listed in Table 1.

[0059] Wherein the preparation method of catalyst M is to be equivalent to 57.61 parts of Fe 2 o 3 Iron oxide red, equivalent to 14.40 parts Fe 2 o 3 Iron oxide yellow, equivalent to 7.67 parts K 2 Potassium carbonate of O, equivalent to 11.34 parts of CeO 2 of cerium oxalate, equivalent to 1.75 parts MoO 3 Ammonium molybdate, calcium hydroxide equivalent to 2.12 parts of CaO and 5.5 parts of sodium hydroxymethylcellulose were ...

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Abstract

The invention relates to a method for producing divinyl benzene by dehydrogenation of diethylbenzene, and mainly solves the technical problems of low conversion rate of diethylbenzene and high ratio of monoene to diene during long-term operation in the prior art. The method is characterized in that a raw material system composed of diethylbenzene and water reacts with a dual-catalyst system in a fixed bed reactor, and the reaction steps comprise that: a) the raw material system contacts a first catalyst M to generate a material flow I; and b) the material flow I contacts with a second catalystN to generate divinyl benzene, so that the technical problem is well solved, and the method can be used for industrial production of divinyl benzene through dehydrogenation of diethylbenzene.

Description

technical field [0001] The invention relates to a method for producing divinylbenzene by dehydrogenating diethylbenzene. Background technique [0002] Divinylbenzene is a very useful cross-linking agent, widely used in ion exchange resins, ion exchange membranes, ABS resins, polystyrene resins, unsaturated polyester resins, synthetic rubber, special plastics, coatings, adhesives and other fields . [0003] The industrial production method of divinylbenzene is mainly obtained by dehydrogenation of diethylbenzene. The dehydrogenation reaction of diethylbenzene is a strong endothermic reaction with an increase in the number of molecules. High temperature and low pressure are conducive to the formation of the target product. Therefore, a process of adding a large amount of superheated steam under high temperature and negative pressure is used in the production process. condition. For the industrial catalytic process of diethylbenzene dehydrogenation to divinylbenzene, the cat...

Claims

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Application Information

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IPC IPC(8): C07C15/44C07C5/333B01J23/887
CPCC07C5/3332B01J23/8872B01J23/8873B01J23/002C07C2523/887B01J2523/00C07C15/44B01J2523/13B01J2523/23B01J2523/3712B01J2523/68B01J2523/842B01J2523/47B01J2523/12B01J2523/27Y02P20/52
Inventor 缪长喜危春玲宋磊陈铜倪军平
Owner CHINA PETROLEUM & CHEM CORP
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