A vocs absorption method

An absorption tower and absorbent technology, which is applied in the field of treatment and recovery of VOCs unorganized discharge in sewage treatment plants, can solve the problems of unfavorable gas absorption, high price, and inconvenience for large-scale use, so as to ensure the absorption effect and high utilization rate. Effect

Active Publication Date: 2021-03-26
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After research, it was found that VOCs such as benzene, propylene, propane, and xylene have high solubility in ionic liquids. However, due to the high viscosity of ionic liquids, it is not conducive to gas absorption. Therefore, in the actual absorption process, the treatment of VOCs cannot achieve the desired effect.
Moreover, ionic liquids are expensive compared to other VOCs absorbents, and are not convenient for large-scale use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The components and mass fractions of a water-in-ionic liquid (IL / W) type VOCs absorbent are:

[0057]

[0058] Prepare the above-mentioned VOCs absorbent to absorb the original exhaust gas. The specific steps are:

[0059] In 5g[DDMIM][NTf 2 ], add 8g of Tween-80, then add 5g of n-butanol, shake well, mix 82g of water with 3ml·min under stirring -1 The speed is added in the above-mentioned solution, obtain microemulsion, prepare three parts of microemulsions standby according to above-mentioned steps (prepare three parts of microemulsions, every part is 100g, three absorption towers have been used in this example, so each absorption tower absorbent For 100g, the data analysis is the absorption effect of 200g, because the actual absorption is two towers participating in the absorption).

[0060]The present invention adopts multi-absorption operation to install 3 absorption devices, the actual working process is 2 absorption devices, and the remaining absorption devi...

Embodiment 2

[0063] The components and mass fractions of a water-in-ionic liquid (IL / W) type VOCs absorbent are:

[0064]

[0065] Prepare the above-mentioned VOCs absorbent to absorb the original exhaust gas. The specific steps are:

[0066] In 5g[DDMIM][NTf 2 ], add 8g of Tween-80, then add 5g of n-butanol, shake well, mix 82g of water with 3ml·min under stirring -1 The speed is added to the above solution to obtain a microemulsion; the mixed organic waste gas containing aromatics, halogenated hydrocarbons and other VOCs is concentrated into the microemulsion. The air pipe is discharged, and the outlet is the purified gas. The initial absorption rate of the absorbent for VOCs can reach more than 78%; separate. This example uses a single-stage absorption operation. Gas intake concentration 2000mg·m -3 , intake flow 0.1Nm 3 h -1 , the absorbent maintains a constant temperature of 303.15K, and the gas residence time is 4s.

[0067] Such as image 3 As shown, when the absorption ...

Embodiment 3

[0069] The components and mass fractions of a water-in-ionic liquid (IL / W) type VOCs absorbent are:

[0070]

[0071]

[0072] Prepare the above-mentioned VOCs absorbent to absorb the original exhaust gas. The specific steps are:

[0073] In 6g[BMIM][PF 6 ], add 10g of Tween-80, then add 6g of n-butanol, shake well, mix 78g of water with 3ml·min under stirring -1 The speed is added in the above-mentioned solution, obtains microemulsion, prepares three parts of microemulsions standby according to above-mentioned steps.

[0074] The present invention adopts multi-absorption operation to install 3 absorption devices, the actual working process is 2 absorption devices, and the remaining absorption devices carry out the desorption process, such as figure 1 As shown, the mixed gas is concentrated in the mixed gas gas cabinet V1, through the gas compressor C1, the optimal intake concentration and intake speed are adjusted, and it is concentrated into the VOCs absorption tower...

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Abstract

The invention provides a VOCs absorption method. According to the method, gas is introduced in a centralized way, continuous operation process of multiple times of absorptions is performed, and wastegas is centralized in a gas storage tank in advance so that the waste gas is fully mixed, the best gas inlet concentration of the waste gas can be also controlled, and the VOCs absorptivity of an absorbent for centralized introduced gas can be improved by 5% or above compared with the absorptivity of direct introduction. According to the operation of an absorption method, the process of needed replacement and desorption of absorption liquid causes that a treatment device cannot work normally. For the operation of multiple times of absorption, 2-4 absorption devices are installed, the actual working process needs 2-3 absorption devices, and the residual absorption device performs desorption process. Therefore, absorption and desorption can be simultaneously performed, the absorption processachieves intermittent and continuous operation. The operation is simple, and energy consumption is low.

Description

technical field [0001] The invention relates to the treatment and recovery of VOCs fugitive emissions from sewage treatment plants, in particular to a method for absorbing VOCs. Background technique [0002] There are many definitions of VOCs (volatile organic compounds). For example, the US ASTMD3960-98 standard defines VOC as any organic compound that can participate in atmospheric photochemical reactions; the definition in air pollution control engineering is that VOCs is a general term for a class of organic compounds , at room temperature, their evaporation rate is high and they are volatile. VOCs include non-methane hydrocarbons (alkanes, alkenes, alkynes, aromatic hydrocarbons, etc.), oxygen-containing organic compounds (aldehydes, ketones, alcohols, ethers, etc.), chlorine-containing organic compounds, nitrogen-containing organic compounds, sulfur-containing organic compounds, etc., which form ozone ( o 3 ) and fine particulate matter (PM2.5) pollution are importan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/18
CPCB01D53/18B01D2252/30B01D2257/708B01D2258/02
Inventor 张文林孙腾飞闫佳伟霍宇李功伟李春利
Owner HEBEI UNIV OF TECH
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