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Low-foam organic waste gas absorbent, and preparation method and application thereof

An organic waste gas and absorbent technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve problems such as VOCs removal that affects mass transfer efficiency, affects pump operation and production safety, and foam occupies space in absorption towers, etc. , to achieve the effect of strengthening absorption and solubilization, improving mass transfer effect, and increasing gas-liquid contact area

Active Publication Date: 2014-11-26
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, surfactants have been widely studied and applied as active components, but in some applications, especially in material systems that are prone to foaming, there are the following problems: 1) A large number of stable bubbles are generated during the absorption process, which affects mass transfer Efficiency and VOCs removal effect; 2) Due to the carrying effect of the foam on the particles, the dust removal efficiency is reduced; 3) Since the foam occupies a large amount of space in the absorption tower, the ventilation of the system is reduced, which affects the operation of the pump and production safety; 4) Absorbent When recycled to the circulation pool, the absorbent overflows from the edge of the circulation pool due to the generation and accumulation of a large number of air bubbles, causing serious waste and polluting the environment

Method used

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  • Low-foam organic waste gas absorbent, and preparation method and application thereof
  • Low-foam organic waste gas absorbent, and preparation method and application thereof
  • Low-foam organic waste gas absorbent, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The organic waste gas from a synthetic leather production, the concentration of main volatile organic compounds is: toluene 200~500mg / m 3 , Butanone 200~400mg / m 3 , Xylene 100~200mg / m 3 , the air volume is 3000~5000m 3 / h, temperature: 30-60°C.

[0035] The average emission concentration of untreated organic waste gas is: toluene 176.5mg / m 3 , Butanone 238.2mg / m 3 , Xylene 121.2mg / m 3. The composition of low-foaming organic waste gas absorbent and the concentration of organic waste gas before purification are shown in Table 1. The quality of VOCs absorbed and purified can reach 1 to 20 times the amount of surfactant used.

[0036] Low-foaming organic waste gas absorbent composition and purification effect in Table 1 Example 1

[0037]

Embodiment 2

[0039] The organic waste gas discharged from a petrochemical plant has a concentration of main volatile organic compounds: benzene 50-150mg / m 3 , Toluene 100~250mg / m 3 , Xylene 50~150mg / m 3 , Chlorobenzene 10~150mg / m 3 , the air volume is 3000~5000m 3 / h, temperature: 20-50°C.

[0040] The average emission concentration of untreated organic waste gas is: benzene 123.1mg / m 3 , toluene 116.1mg / m 3 , Xylene 167.2mg / m 3 , Chlorobenzene 72.6mg / m 3 . The composition of the low-foaming organic waste gas absorbent and the concentration of the purified organic waste gas are shown in Table 2. The quality of VOCs absorbed and purified can reach 1 to 20 times the amount of surfactant used.

[0041] Low-foaming organic waste gas absorbent composition and purification effect in Table 2 Example 2

[0042]

Embodiment 3

[0044] The organic waste gas emitted by a semiconductor production, the concentration of main volatile organic compounds is: acetone 50-200mg / m 3 , methyl ethyl ketone 50~200mg / m 3 , Toluene 100~200mg / m 3 , the air volume is 3000~3000m 3 / h, temperature: 20-40°C.

[0045] The average emission concentration of untreated organic waste gas is: acetone 113.2mg / m 3 , methyl ethyl ketone 126.1mg / m 3 , toluene 126.2mg / m 3 . The composition of the low-foaming organic waste gas absorbent and the concentration of the purified organic waste gas are shown in Table 3. The quality of VOCs absorbed and purified can reach 1 to 20 times the amount of surfactant used.

[0046] Low-foaming organic waste gas absorbent composition and purification effect in Table 3 Example 3

[0047]

[0048]

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Abstract

The invention discloses a low-foam organic waste gas absorbent, and a preparation method and application thereof. The low-foam organic waste gas absorbent is composed of the following components in percentage by mass: 96.2-99.8% of water, 0.001-3% of surfactant, 0.1-2% of assistant and 0.05-2% of inorganic salt. The surfactant is more than one of fatty alcohol polyoxyethylene polyoxypropylene ether, branched chain fatty alcohol polyoxyethylene polyoxypropylene ether, fatty alcohol polyoxyethylene (15) ether, fatty alcohol polyoxyethylene (20) ether and fatty acid monoglycollic amide polyglycol ether. The absorbent has low foam property and unique solubilizing power for VOCs (volatile organic compounds), so that the absorptive purification system can operate normally and stably under various systems with high or low foaming tendency, and is suitable for treating various industrial organic waste gases.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, in particular to a low-foaming organic waste gas absorbent and its preparation method and its use to purify aromatic hydrocarbons, alkanes, esters, aldehydes, ketones, alcohols, halogenated hydrocarbons, organic sulfides and chlorine Chemicals and other industrial organic waste gas methods. Background technique [0002] The organic waste gas emitted by industry is an important source of volatile organic compounds (VOCs). It involves many industries and has the characteristics of high emission intensity, high concentration, many types of pollutants, and long duration. VOCs mainly include alkanes, olefins and aromatic hydrocarbons, as well as various oxygen-containing hydrocarbons, halogenated hydrocarbons, nitrogen hydrocarbons, sulfur hydrocarbons, low-boiling polycyclic aromatic hydrocarbons, etc., which will cause serious environmental pollution when discharged into the atmosphere...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78
Inventor 陈定盛岑超平唐志雄方平陈志航陈雄波
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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