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A kind of absorbent for recovering toluene in industrial waste gas and its application

A technology of industrial waste gas and absorbent, applied in gas treatment, separation method, separation of dispersed particles, etc., can solve the problems of easy volatilization, low solubility, increased loss of NMP, etc.

Active Publication Date: 2021-04-20
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, NMP has low solubility and is volatile. Although water is used as a solvent in the upper part of the absorption tower to absorb this part of NMP, excessive water content will increase regeneration energy consumption and NMP loss will also increase.

Method used

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  • A kind of absorbent for recovering toluene in industrial waste gas and its application
  • A kind of absorbent for recovering toluene in industrial waste gas and its application
  • A kind of absorbent for recovering toluene in industrial waste gas and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The waste gas to be treated in the present invention comes from the tail gas of aromatics production, containing 6-10g / m 3 Toluene and some water vapour. Since the toluene exhaust gas with the same composition as the actual factory cannot be obtained under the existing experimental conditions, it is necessary to simulate the toluene exhaust gas used in the experiment, and the toluene content in the simulated exhaust gas is about 8000mg / m 3 , the water vapor content is about 2.0%.

[0032] The moisture content is measured with a Karl Fischer method trace moisture analyzer, and the GC9800 gas chromatograph is used to detect the concentration of toluene in the intake air and exhaust gas. The measured peak area reflects the measured toluene content through the toluene standard curve, and then calculates the toluene content. Absorption rate, and the content of toluene in the solution before and after desorption by gas chromatography.

[0033] Process equipment: such as F...

Embodiment 2

[0042] 80wt% NHD and 20wt% sulfolane are used to make absorbent to absorb toluene in waste gas. The produced rich absorption liquid containing toluene flows out from the outlet of the lower section of the absorption tower, enters the circulation tank 1, and then flows into the regeneration tower from the feed inlet of the lower section of the regeneration tower by the circulation tank 1 (the operating temperature of the regeneration tower is 140-170°C, The operating pressure is 10-50kPa) for vacuum distillation, and the regenerated lean liquid (toluene content is less than 0.5‰, and water content is less than 0.5%) flows out from the outlet of the lower section of the regeneration tower, and passes through the condenser (the cooling medium is cooling water ) is cooled to 18-20°C, stored in the solvent tank, and regularly flows into the circulation tank 2. The results are shown in Table 3

[0043] Table 3 Repeated absorption effect

[0044]

[0045] It can be seen from Tab...

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Abstract

The invention discloses an absorbent for recovering toluene in industrial waste gas and its application, including polyethylene glycol dimethyl ether (NHD), NHD and N-methylpyrrolidone (NMP) or sulfolane or dioctyl phthalate Composite solvent. The absorbent is used to absorb toluene waste gas to obtain purified gas and absorb rich liquid, and the rich liquid is regenerated by vacuum distillation and reused. The absorbent has the advantages of high solubility, high purification rate, low volatility, less solvent loss, high stability, good safety, and recyclability, and is especially suitable for the absorption and purification of toluene waste gas.

Description

technical field [0001] The invention belongs to the technical field of VOCs waste gas treatment, and relates to an absorbent for recovering organic waste gas, in particular to an absorbent for recovering toluene from industrial organic waste gas and its application. Background technique [0002] Toluene waste gas treatment has always been the difficulty and focus of industrial waste gas treatment in my country. According to the technical thinking of toluene waste gas treatment, it can generally be divided into two types: elimination method and recovery method. The elimination method is to eliminate VOCs in the exhaust gas, including combustion method, photocatalytic oxidation method, low-temperature plasma method and biodegradation method; the recovery method is based on the concept of resource recovery, and the useful components in the exhaust gas are recovered as much as possible to achieve environmental protection. The purpose of governance and resource conservation, incl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCB01D53/1487B01D53/1493B01D2252/202B01D2252/2056B01D2252/504B01D2257/7027
Inventor 付博张润叶田建昌
Owner NANJING FORESTRY UNIV
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