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. The effect of high activity, easy operation and high recovery of aromatics

Inactive Publication Date: 2004-03-24
CHINA PETROLEUM & CHEM CORP
View PDF0 Cites 5 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] 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.

[0016] 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

[0018] 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.

[0019] 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

[0021] 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.

[0022] 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%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
Login to view more

Abstract

The method for purifying and recovering aromatic hydrocarbon in the tail gas of oxydol production equipment adopts the pretreated active carbon catalyst as adsorption agent to remove aromatic hydrocarbon and recover and reuse it. Its adsorption condition is as follows: tail gas pressure is 0.2-2 MPa, temp. is 0-40 deg.C, space velocity is 100-2000 h(-1), and the inlet aromatic hydrocarbon content is less han or equal to 1000 ppm generally; then it uses the superheated stream or N2 to heat at 120 deg.C-400 deg.C to make desorption, and make cooling treatment so as to recover aromatic hydrocarbon.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap