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A method for producing styrene by oxidizing ethylbenzene and dehydrogenating waste gas from adipic acid plant

A technology for producing adipic acid by dehydrogenation of ethylbenzene, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, and bulk chemical production, etc., can solve complex processes, high costs, and long time-consuming And other issues

Active Publication Date: 2021-04-27
CHINA TIANCHEN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Patent CN106881108A discloses a method for preparing a nitrous oxide decomposition catalyst. In this preparation method, the mixed salt solution and the precipitant are mixed in the way of co-current dropwise addition, which takes a long time, and the catalyst prepared by this method needs to be treated with a strong alkali Post-processing and secondary roasting, the process is complicated and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 40.4g Fe(N0 3 ) 3 9H 2 O, 119.0g CeCl 2 6H 2 O, 2.6g Bi(NO 3 ) 3 ·6H 2 O and 2.6gLa(NO 3 ) 3 6H 2 O was dissolved in 600ml of desalted water to form a salt solution. Prepare 0.1 M ammonia water containing 5% polyvinyl alcohol as a precipitant. The salt solution and the precipitating agent are injected into the cyclone reactor at the same time, and after rapid mixing, the obtained slurry is transferred to the reaction vessel, and the co-precipitation reaction is continued, and the pH in the reactor is controlled to be 7. Continue to stir for 3 hours, vacuum filter, wash with desalted water until neutral, dry and calcinate at 450° C. for 3 hours to obtain the finished catalyst powder.

[0024] The above-mentioned catalyst is made into 20-40 mesh particles, 0.8 g of mixed 2.0 g of quartz sand is put into a quartz tube with an inner diameter of 10 mm, and a fixed-bed microreactor is used to evaluate its catalytic activity in the reaction of nitrous oxide and eth...

Embodiment 2

[0026] 48.5g Bi(NO 3 ) 3 ·5H 2 O, 145.5g Ce(NO 3 ) 2 ·6H 2 O with 8.7g Fe(NO 3 ) 3 ·6H 2O was dissolved in 500ml desalted water to form a salt solution. A 0.1 M hexamethylenetetramine solution containing 10% carboxymethylcellulose was prepared as a precipitating agent. The salt solution and the precipitating agent are injected into the cyclone reactor at the same time, and after rapid mixing, the obtained slurry is transferred to the reaction vessel, and the co-precipitation reaction is continued, and the pH in the reactor is controlled to be 9. Continue to stir for 4 hours, vacuum filter, wash with desalted water until neutral, dry and calcinate at 550° C. for 3 hours to obtain the finished catalyst powder.

[0027] The above catalyst was made into 20-40 mesh particles, 0.8g mixed with 2.0g quartz sand was put into a quartz tube with an inner diameter of 10mm, and its catalytic activity in the decomposition reaction of nitrous oxide was evaluated by using a fixed-bed...

Embodiment 3

[0029] 20.5g Fe(NO 3 ) 3 9H 2 O, 24.4g Bi(NO 3 ) 3 ·5H 2 O, 130.8g Ce(NO 3 ) 2 ·6H 2 O and 6.7gLa(NO 3 ) 3 ·6H 2 O was dissolved in 500ml desalted water to make a salt solution. A 0.1 M urea solution containing 8% polyethylene glycol was prepared as a precipitating agent. The salt solution and the precipitating agent are injected into the cyclone reactor at the same time, and after rapid mixing, the obtained slurry is transferred to the reaction vessel, and the co-precipitation reaction is continued, and the pH in the reactor is controlled to be 9. Continue to stir for 4 hours, vacuum filter, wash with desalted water until neutral, dry and calcinate at 550° C. for 3 hours to obtain the finished catalyst powder.

[0030] Make the above catalyst into 20-40 mesh particles, take 0.8g mixed with 2.0g quartz sand and put it into a quartz tube with an inner diameter of 10mm, and use a fixed-bed microreactor to evaluate its catalytic activity in the decomposition reaction ...

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Abstract

The invention provides a method for producing styrene by oxidizing ethylbenzene and dehydrogenating the waste gas of an adipic acid plant, using a Ce-based catalyst modified by an auxiliary agent, and using the tail gas of the adipic acid plant as an oxidant for the oxidative dehydrogenation of ethylbenzene Hydrogen to styrene. The catalyst is prepared by an unconventional co-precipitation method, with Ce oxides as the main active component, and one or more of Fe, La, Bi, Mg, Ca, Ag, and K as additives. After washing, drying, Roasting and other steps to obtain the finished catalyst. The technical application of the present invention can not only utilize the industrial waste gas of adipic acid plant with high value, but also effectively solve the problem of poor selectivity in the oxidative dehydrogenation of ethylbenzene.

Description

technical field [0001] The invention belongs to the fields of chemical catalysis technology and air pollution control technology, and specifically relates to a method for producing styrene by oxidizing ethylbenzene and dehydrogenating waste gas from an adipic acid plant, and a method for preparing a Ce-based catalyst used in the reaction. Background technique [0002] Nitrous oxide (N 2 O), commonly known as laughing gas, not only can seriously destroy the ozone layer, but also has a strong greenhouse effect. Its destructive effect on the ozone layer is greater than that of chlorofluorocarbons. The greenhouse effect produced is 310 times and 15 times that of carbon dioxide and methane, respectively. This gas can persist in the atmosphere for up to 120 years, and its chemical properties are stable. Nitrous oxide has become the primary substance that depletes the ozone layer emitted by humans. Man-made emissions of nitrous oxide mainly include tail gas from chemical productio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C5/333C07C15/46B01J23/843
CPCB01J23/002B01J23/843B01J2523/00C07C5/333C07C2523/843C07C15/46B01J2523/3706B01J2523/3712B01J2523/54B01J2523/842Y02P20/52
Inventor 陈涛孙腾李新亮张鑫艾晓欣张丰扬张进治王振华徐烨琨
Owner CHINA TIANCHEN ENG
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