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Method for recovering aromatic hydrocarbon in tail gas of oxydol production apparatus

The technology of a production device and a recovery method is applied in the field of purification and recovery of aromatic hydrocarbons in the tail gas of a hydrogen peroxide production device, and can solve the problems of high loss of aromatic hydrocarbons, failure to meet environmental protection requirements, and no effective practicality, and achieve adsorption and removal. The effect of high activity, easy operation and high recovery of aromatics

Inactive Publication Date: 2005-05-11
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This not only fails to meet environmental protection requirements, but also keeps the loss of aromatics high, causing waste and increasing production costs
Although some manufacturers have also increased activated carbon treatment (such as the disclosed method of "Hydrogen Peroxide Oxidation Tail Gas Two-Stage Treatment Technology Design" in the 6th issue of "Chemical Engineering" magazine, volume 27, P47-50 in 1999, it adopts general shoe factory and paint factory TF type honeycomb activated carbon for waste gas treatment to adsorb aromatic hydrocarbons), but the effect is not ideal
It can not only efficiently remove aromatics in the tail gas, protect the environment, but also recycle and reuse aromatics to reduce losses. At present, no effective and practical method has been seen.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Choose ordinary activated carbon with a particle size of Φ3×5mm, use 1MHNO 3 Immerse for 12h, then dry, pass N 2 Baking is performed at 200°C. Take 1000ml and put it into a reactor with a volume of 1000ml. The adsorption conditions are the same as in Comparative Example 1. The content of aromatics at the inlet is 5000ppm, and the content of aromatics at the outlet is 210ppm.

[0017] Adsorb the above-mentioned adsorbent sample fully until no more weight gain, at this time the adsorption rate is 34.2%, remove the sample, and put the reactor into 180°C N 2 , the outlet is connected to a coil-type water-cooled heat exchanger, and the cooled aromatics are recovered. It is measured that the recovered aromatics account for 79.7% of the total weight gain. The process of adsorption and regeneration is repeated, and the secondary recovery rate is 94.6%.

Embodiment 2

[0019] Get some of the activated carbon processed in Example 1, and use an equal volume of 0.2M Zn(NO 3 ) 2 Immerse for 12h, then dry and pass N 2 Roasting is carried out at 200°C, the adsorption conditions are the same as in Example 1, the aromatics content at the inlet is 5600ppm, and the aromatics content at the reactor outlet is <100ppm.

[0020] The above adsorbent sample is fully adsorbed until it no longer increases in weight. At this time, the adsorption rate is 38.5%. Remove the sample and put the reactor into 180 ° C N 2 , the outlet is connected to a coil-type water-cooled heat exchanger, and the cooled aromatics are recovered. It is measured that the recovered aromatics account for 76.1% of the total weight gain. The process of adsorption and regeneration was repeated, and the secondary recovery rate was 104.9%.

Embodiment 3

[0022] Ordinary activated carbon with a particle size of Φ3×5mm was selected, impregnated with 0.2M NaOH for 12h, then dried, and passed through N 2 Baking is performed at 200°C. Take 600ml and put it into a reactor with a volume of 1000ml, the adsorption conditions are the same as in Example 1, the inlet aromatics content is 4000ppm, and the aromatics outlet content is <100ppm.

[0023] Adsorb the above-mentioned adsorbent sample fully until it no longer increases in weight. At this time, the adsorption rate is 25.7%. Remove the sample and put the reactor into 180°C N 2 , the outlet is connected to a coil-type water-cooled heat exchanger, and the cooled aromatics are recovered. It is measured that the recovered aromatics account for 70.9% of the total weight gain. The process of adsorption and regeneration is repeated, and the secondary recovery rate is 96.5%.

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Abstract

The invention relates to a method for purifying and recovering aromatics in the tail gas of a hydrogen peroxide production device. The method uses a pretreated active carbon catalyst as an adsorbent to remove the aromatics in the tail gas and recover and reuse them. The adsorption conditions are: tail gas pressure 0.2-2MPa, temperature 0-40℃, space velocity 100-2000h -1 , the inlet aromatics content is generally ≤10000ppm; then superheated steam or N 2 Heating at 120°C to 400°C for desorption, cooling to recover aromatics. The present invention has high adsorption and removal rate of aromatics in the tail gas of hydrogen peroxide production equipment, large adsorption capacity, high recovery rate of aromatics, simple process, easy operation, suitable for industrial application, can meet environmental protection requirements, and can reduce consumption of aromatics and improve The input / output ratio of the device.

Description

technical field [0001] The present invention relates to a purification-recovery method of aromatics in the tail gas of a hydrogen peroxide production device, more specifically, the present invention relates to a method for C in the tail gas of a hydrogen peroxide production device 8 -C 11 Purification-recovery method of aromatic hydrocarbons. Background technique [0002] The purification-recovery requirements of aromatics in the vent gas of hydrogen peroxide production units are related to environmental protection and equipment consumption reduction. Most of the domestic hydrogen peroxide production units adopt the low-temperature cooling method to recover the aromatics in the vent gas. But the content of aromatics in the tail gas after cooling (5-10°C) is still very high, about 3000-7000ppm, sometimes higher than 10000ppm. This not only fails to meet environmental protection requirements, but also keeps the loss of aromatics high, resulting in waste and increased produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01J20/20B01J20/32C01B15/022
Inventor 周红军郭玉峰刘卫江周广林孔海燕张献军
Owner CHINA PETROLEUM & CHEM CORP
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