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Absorption and adsorption treatment method of high-concentration benzene gas

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

Active Publication Date: 2017-05-17
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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  • Absorption and adsorption treatment method of high-concentration benzene gas
  • Absorption and adsorption treatment method of high-concentration benzene gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Benzene is loaded to produce benzene-containing gas, and nitrogen is used as protective gas. The main component of the generated benzene-containing gas is nitrogen, and the benzene concentration can reach up to 4 vol%. 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 10. The absorbed gas enters the condenser, and the condensation temperature is as low as -10°C. Finally, enter the three boxes of activated carbon fiber adsorbers, and switch between the three boxes. A total of 120 kilograms of activated carbon fiber adsorbents are loaded. The adsorption time was 20 minutes. Water vapor desorption. After the desorbed gas is condensed by the circulating cooling water, the desorbed gas condensate enters the separator for stratification, organic matter such as ethylbenzene and benzene is recycled, and the water enter...

Embodiment 2

[0064] The benzene storage tank produces benzene-containing gas, and nitrogen is used as the protective gas. The main component of the generated benzene-containing gas is nitrogen, and the benzene concentration can reach up to 4 vol%. 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 -5°C. Enter three boxes of activated carbon fiber adsorbers at last, and the three boxes are switched to use, and 240 kilograms of activated carbon fiber adsorbents are filled in total. The adsorption time was 15 minutes. Hot nitrogen desorption, temperature 150°C. The desorbed gas enters the condenser inlet for processing. In the exhaust gas after absorption, condensation and adsorption treatment, the concentration of ethylben...

Embodiment 3

[0066] When benzene is unloaded, benzene-containing gas is generated, and nitrogen is used as protective gas. The main component of the generated benzene-containing gas is nitrogen, and the benzene concentration can reach up to 4.5vol%. Capacity 600m 3 / h. First, use a packed absorption tower to absorb, the absorbent is a mixture of toluene, xylene and ethylbenzene, 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 -15°C. Finally, enter the three boxes of activated carbon fiber adsorbers, and switch between the three boxes. A total of 480 kg of activated carbon fiber adsorbents were loaded. The adsorption time was 10 minutes. Water vapor desorption. After the desorbed gas is condensed by the circulating cooling water, the desorbed gas condensate enters the separator for stratification, organic matter such as ethylbenzene and benzene ...

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Abstract

The invention relates to an absorption and adsorption treatment method of high-concentration benzene gas. The method comprises the steps of (a) carrying out absorption treatment on the high-concentration benzene gas by using efficient absorption equipment, forming absorption liquid and absorbed gas and recycling the absorption liquid; (b) carrying out condensation treatment on the absorbed gas through a condenser, wherein the condensation temperature is -40 DEG C to 5 DEG C, and forming condensate and a condensed gas after condensation treatment and recycling the condensate; and (c) adsorbing and purifying the condensed gas through activated carbon fiber adsorber, forming a purified gas for discharging, carrying out desorption treatment to form desorbed gas and forming recyclable desorbed gas condensate after condensation. The absorption and adsorption treatment method aims at solving the technical problem of how to reduce the concentration of benzene in the benzene gas to 4mg / Nm<3> or below, and meanwhile, the absorption liquid and the condensate can be separated or can be directly used for other processes. The method provided by the invention is applied to treatment of a benzene material lift truck, tail gas generated by a benzene storage tank and other high-concentration benzene gases.

Description

technical field [0001] The invention relates to the field of environmental protection technology, and relates to an absorption and adsorption treatment method for gas containing high concentration of benzene. 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 gas is 4mg / m 3 . Therefore, the treatment of benzene-containing gas needs to achieve a high removal efficiency...

Claims

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Application Information

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IPC IPC(8): B01D5/00B01D53/02B01D53/14
CPCB01D5/0057B01D53/002B01D53/02B01D53/1487B01D53/1493B01D2252/205B01D2252/504B01D2253/102B01D2257/7027B01D2259/40086B01D2259/4009
Inventor 尹晔东
Owner BEIJING CREDITCONGRUITY ENERGY TECH CO LTD
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