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Treatment method for gas containing high-concentration benzene

A treatment method and high-concentration technology, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of large heat release, high investment and operating costs, and large equipment.

Active Publication Date: 2017-05-10
BEIJING CREDITCONGRUITY ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of adsorption conditions, the gas concentration of adsorption treatment should not be too high, otherwise the heat release during the adsorption process will be large, resulting in huge equipment, high investment and operating costs

Method used

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  • Treatment method for gas containing high-concentration benzene
  • Treatment method for gas containing high-concentration benzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Benzene is loaded to produce benzene-containing gas, and nitrogen is used as protective gas. The main component of the benzene-containing gas produced is nitrogen, and the benzene concentration can reach up to 4vol% (about 139g / Nm 3 ). Capacity 500m 3 / h. Firstly, it is absorbed with a supergravity absorber, the absorbent is ethylbenzene, and the flow rate is 2m 3 / h, the number of theoretical plates for mass transfer in the absorber is 9. Then pressurize 15kPa by the fan, and the absorbed gas enters the condenser, and the lowest condensation temperature is -45°C. Then it enters the activated carbon adsorption tower, and the two towers are switched to use. Each tower is filled with 4 tons of activated carbon adsorbent. The adsorption time was 10 minutes. The vacuum desorption time is 8 minutes. The adsorption cycle is 10 minutes, and the maximum vacuum is 5kPa absolute pressure. The desorbed gas is returned to the inlet of the condenser. The liquid produced by...

Embodiment 2

[0063] The benzene storage tank produces benzene-containing gas, and nitrogen is used as the protective gas. The main component of the benzene-containing gas produced is nitrogen, and the benzene concentration can reach up to 4vol% (about 139g / Nm 3 ). Capacity 200m 3 / h. Firstly, it is absorbed with a supergravity absorber, the absorbent is a mixture of xylene and ethylbenzene, and the flow rate is 1m 3 / h, the number of theoretical plates for mass transfer in the absorber is 10. The absorbed gas enters the condenser, and the condensation temperature is as low as -25°C. Then it enters the adsorption tower, and the two towers are switched to use. Each tower is filled with 3 tons of activated carbon adsorbent and 1 ton of hydrophobic zeolite adsorbent. The adsorption time was 8 minutes. The vacuum desorption time is 6 minutes. The adsorption cycle is 8 minutes, and the maximum vacuum is 3kPa absolute pressure. The desorbed gas is returned to the inlet of the condenser. ...

Embodiment 3

[0065] When benzene is unloaded, benzene-containing gas is generated, and nitrogen is used as protective gas. The main component of the benzene-containing gas produced is nitrogen, and the benzene concentration can reach up to 4.5vol% (about 157g / Nm 3 ). Capacity 600m 3 / h. First use a packed absorption tower for absorption, the absorbent is a mixture of toluene, xylene and ethylbenzene, wherein toluene is 10%, xylene is 15%, ethylbenzene is 75%, and the flow rate is 4m 3 / h, the number of theoretical plates for mass transfer in the absorber is 10. The absorbed gas enters the condenser, and the condensation temperature is as low as -20°C. Then enter the hydrophobic silica gel adsorption tower, and switch between the two towers. Each tower is filled with 7 tons of silica gel adsorbent. The adsorption time was 5 minutes. The vacuum desorption time is 4 minutes, and the maximum vacuum degree is an absolute pressure of 8kPa. The adsorption cycle is 5 minutes. The desorbed...

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Abstract

The invention relates to a treatment method for gas containing high-concentration benzene. The treatment method comprises the following steps: (a) carrying out absorption treatment on the gas containing the high-concentration benzene in absorption equipment by using an absorbent to form absorption liquid and absorbed gas, and recycling the absorption liquid; (b) carrying out condensation treatment on the absorbed gas by a condenser at the condensation temperature of 0 to 70DEG C to form condensed liquid and condensed gas, and recycling the condensed liquid; (c) carrying out adsorbing purification on the condensed gas by an adsorbent in an adsorber to form purified gas, and exhausting the purified gas; carrying out vacuumizing desorption on the adsorbent to form desorbed gas, and returning the desorbed gas to an inlet of the condenser or an inlet of the absorption equipment. The invention aims to achieve the aim that the concentration of the benzene in the benzene-containing gas is reduced to be 4mg / Nm<3> or lower; meanwhile, the absorption liquid and the condensed liquid can be easily treated or can be directly used for other processes. The treatment method disclosed by the invention is applied to treatment of tail gases generated by a benzene material dumper and a benzene storage tank, other high-concentration benzene-containing gases, and the like.

Description

technical field [0001] The invention relates to the field of environmental protection technology, and relates to a method for treating gas containing high concentration of benzene. The treatment process includes three techniques of absorption, condensation and adsorption. Background technique [0002] Benzene is a common petrochemical basic raw material with a wide range of applications. Benzene is the simplest aromatic hydrocarbon, hardly soluble in water, easily soluble in organic solvents, and can also be used as an organic solvent itself. Benzene is highly volatile, and its saturated vapor pressure reaches 13kPa at 25°C, and it is easy to form high-concentration benzene-containing gas. Benzene is highly toxic, and there are strict concentration standard limits for both emissions and gasoline and other oil products. For example, the national standard GB31571-2015 stipulates that the emission limit of benzene pollutants in the exhaust gas is 4mg / m 3 . Therefore, the t...

Claims

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Application Information

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IPC IPC(8): B01D53/14B01D53/00B01D5/00B01D53/02
CPCB01D5/00B01D5/009B01D53/02B01D53/1418B01D53/1425B01D53/1487B01D53/1493B01D2252/205B01D2252/50B01D2257/7027B01D2257/708B01D2258/02
Inventor 尹晔东
Owner BEIJING CREDITCONGRUITY ENERGY TECH CO LTD
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