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Method for producing styrene

A technology of styrene and ethylbenzene, applied in the field of styrene production, can solve the problems of low conversion rate and high reaction temperature

Active Publication Date: 2015-02-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to use Fe in the prior art 2 o 3 -K 2 O-based catalysts require a large amount of water vapor, high reaction temperature and low conversion rate, and provide a method for the production of styrene

Method used

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  • Method for producing styrene

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Experimental program
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Embodiment 1

[0015] The concrete weight composition of 40ml catalyst is: 69% Fe 2 o 3 -12%K 2 O-10%CeO 2 -3% MoO 3 -6% MgO containing Fe 2 o 3 -K 2 The specific weight composition of O series catalyst and 60ml catalyst is: 7%V 2 o 5 -4%Cr 2 o 3 -89%Al 2 o 3 V 2 o 5 -Cr 2 o 3 -Al 2 o 3 The catalyst is loaded into a 100ml isothermal reactor, and 40ml of Fe-containing 2 o 3 -K 2 O-based catalyst, and then fill the upper part with 60ml V 2 o 5 -Cr 2 o 3 -Al 2 o 3 system catalyst. The reaction was carried out at 600°C, pressure 1 atmosphere, CO 2 :H 2 The molar ratio of O:ethylbenzene is 4:6:1, and the space velocity of ethylbenzene is 1.0 hours -1 . The catalyst loading sequence and loading amount, and ethylbenzene dehydrogenation performance are shown in Tables 1 and 2, respectively.

Embodiment 2

[0017] First load the V of 60ml embodiment 1 at the bottom of the reactor 2 o 5 -Cr 2 o 3 -Al 2 o 3 system catalyst, then on its top then fill system 40ml embodiment 1 containing Fe 2 o 3 -K 2 O-based catalyst, the reaction temperature is 580°C, CO 2 :H 2 O: the mol ratio of ethylbenzene is 5: 5: 1, all the other conditions are with embodiment 1. Catalyst loading sequence and loading amount, ethylbenzene dehydrogenation temperature and CO 2 :H 2 The molar ratio of O:ethylbenzene and the dehydrogenation reaction performance are shown in Tables 1 and 2, respectively.

Embodiment 3

[0019] The Fe of 40ml embodiment 1 is charged at the bottom of the reactor earlier 2 o 3 -K 2 O series catalyst, then fill the V of 60ml embodiment 1 on its top again 2 o 5 -Cr 2 o 3 -Al 2 o 3 catalyst, the reaction temperature is 600 °C, CO 2 :H 2 O: The mol ratio of ethylbenzene is 6: 4: 1, and all the other conditions are the same as in Example 1. Catalyst loading sequence and loading amount, ethylbenzene dehydrogenation temperature and CO2 :H 2 The molar ratio of O:ethylbenzene and the dehydrogenation reaction performance are shown in Tables 1 and 2, respectively.

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Abstract

The invention relates to a method for producing styrene. The method mainly solves the problems that a Fe2O3-K2O catalyst needs a great quantity of steam, the reaction temperature is high and the ethylbenzene percent conversion is low in the former technology. According to the invention, the method for producing the styrene comprises the steps of serving ethylbenzene as a reaction raw material, and contacting and dehydrogenizing ethylbenzene and a catalyst to generate the styrene in a reaction temperature of 500-620 DEG C, a styrene air space velocity of 0.5-3.0h<-1>, a reaction pressure of 0-20KPa, and a mole ratio of CO2 to H2O to ethylbenzene of 3:7:1-7:3:1. The adopted reaction materials solve the problems through a technical scheme of V2O5-Cr2O3-Al2O3 and Fe2O3-K2O as catalysts respectively, so that the reaction raw materials can be applicable to the industrial production.

Description

technical field [0001] The present invention relates to a method for the production of styrene. Background technique [0002] Styrene is an important basic organic raw material. More than 90% of styrene in industry is obtained by catalytic dehydrogenation of ethylbenzene. At present, there are more than 100 sets of styrene plants in more than 30 countries and regions in the world, with an annual production capacity of 31.5 million tons of styrene, and a domestic production capacity of about 4.7 million tons per year. [0003] The catalytic dehydrogenation of ethylbenzene to styrene is a strong endothermic reaction with an increase in the number of molecules, and the reaction is carried out at a lower pressure, which is beneficial to the production of styrene. Therefore, in order to reduce the pressure of the reaction system in the actual production process, a tail gas compressor is used to compress the dehydrogenation tail gas, and at the same time, a large amount of water ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C15/46C07C5/333
Inventor 缪长喜张惠明刘剑锋
Owner CHINA PETROLEUM & CHEM CORP