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Multiple-step adiabatic negative dehydrogenation method for making styrene

A multi-stage, styrene technology, applied in dehydrogenation to hydrocarbons, organic chemistry, etc., can solve problems such as unsatisfactory results, catalytic activity and production capacity decline

Active Publication Date: 2006-05-03
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 this invention is that only two-stage reactors are used in the prior art, and a high-selectivity dehydrogenation catalyst is used in the upstream reactor, and a low-selectivity catalyst is used in the downstream reactor. The effect is not good. Ideal, the problem of catalytic activity and production capacity decline, providing a new multi-stage adiabatic negative pressure dehydrogenation method for the production of styrene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5 and comparative example 1～4

[0016] Composition of highly active weights into Fe 2 o 3 (70%)-K 2 O(12%)-Ce 2 o 3 (10%)-MoO 3 (3%)-CuO(5%) Catalyst A is packed in the first reactor, and the composition of high selectivity is Fe 2 o 3 (72%) - K 2 O(10%)-Ce 2 o 3 (9%) - WO 3 (4%)-CaO (5%) dehydrogenation catalyst B is packed in the second reactor, and reaction pressure is normal pressure, liquid space velocity 0.5 hour -1 , the reaction temperature is 620° C., water vapor / ethylbenzene (weight) = 1.30, and the reactor pressure is 50 KPaA for performance evaluation. The loadings and evaluation conditions of various catalysts in Examples 2, 3, 4 and Comparative Examples 1, 2, 3, and 4 are the same as those in Example 1, but the combinations are changed. The combinations are shown in Table 1, and the evaluation results are shown in Table 2.

[0017] first reactor

[0018] Ethylbenzene conversion %

[0019] The present invention provides an optimal combination scheme of dehydro...

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PUM

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Abstract

The invention relates to multi-stage insulation negative pressure dehydrogenation method to solve the problems in prior art that has not ideal effect and low production capacity, which comprises: using at least two dehydrogenation reactors in series with one filled with high-active catalyst and one filled with high-selectivity dehydrogenation catalyst; driving the material of ethylbenzene to pass at least two reactors with different catalysts.

Description

technical field [0001] The invention relates to a multi-stage adiabatic negative pressure dehydrogenation method for producing styrene. Background technique [0002] The main reaction of ethylbenzene dehydrogenation is: <chemistry num="001"> <chem file="200410067623_cml001.xml" / > < / chemistry> . It is a strongly endothermic reaction in which the number of molecules increases. From a thermodynamic point of view, increasing the temperature and reducing the system pressure are beneficial to the reaction. At present, most of them use negative pressure devices, but the single-pass conversion rate of catalytic dehydrogenation is limited by thermodynamic equilibrium, the reaction needs to be carried out at high temperature, and too high reaction temperature will not only easily lead to the cracking of ethylbenzene, but also produce benzene, toluene, CO, CO 2 And other by-products, and energy consumption is very big, economically u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/46C07C5/32
Inventor 缪长喜张惠明
Owner CHINA PETROLEUM & CHEM CORP
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