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Efficient low-loss solvent and process used for absorbing toluene

An absorbent, toluene technology, applied in the field of high-efficiency and low-loss solvents and processes, can solve the problems of high requirements for microbial strains, secondary pollution of activated carbon, and high catalyst costs, and solve the problem of substandard discharge concentration, low solvent loss, and absorption efficiency. high effect

Inactive Publication Date: 2018-02-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the traditional methods are simple in principle and easy to implement, they all have certain defects and limitations.
The activated carbon adsorption method is suitable for working conditions with low concentration and small gas volume. If the exhaust gas volume is large or the concentration is high, the activated carbon needs to be replaced frequently, and the large amount of waste activated carbon generated is likely to become secondary pollution, and the operating cost is high; catalytic The combustion method has the disadvantages of high cost of the catalyst and a certain lifespan, too much air will lead to high fuel consumption, and insufficient combustion will be caused by lowering the furnace temperature; the biological treatment method is limited to the treatment of low-concentration organic waste gas, and is Microbial strains have high requirements

Method used

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  • Efficient low-loss solvent and process used for absorbing toluene

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Embodiment 1

[0027] A high-efficiency and low-loss flow process for absorbing toluene in this embodiment, the schematic flow chart of which is shown in figure 1 shown. The specific processing steps are as follows:

[0028] Waste gas containing toluene (the flow rate of waste gas containing toluene from the coating process is 4000m 3 / h, operating temperature is 35°C, toluene concentration is 400g / m 3 ) first from the absorption tower (the height of the absorption tower is 12m, the height of the lower packing layer is 5m, the height of the upper packing layer is 3m, and the tower diameter is 0.8m; The gas feed inlet of the lower section, which is arranged with liquid level gauge, temperature sensor and pressure sensor) enters the absorption tower, and flows from bottom to top in the absorption tower; at the same time, the absorbent NMP enters from the middle feed inlet of the absorption tower (flow rate 200kg / h), and absorb from top to bottom in countercurrent contact with exhaust gas in...

Embodiment 2

[0031] A high-efficiency and low-loss flow process for absorbing toluene in this embodiment, the schematic flow chart of which is shown in figure 1 shown. The specific processing steps are as follows:

[0032] Waste gas containing toluene (the flow rate of waste gas containing toluene from the coating process is 6000m 3 / h, operating temperature is 35°C, toluene concentration is 500g / m 3) first from the absorption tower (the height of the absorption tower is 12m, the height of the lower packing layer is 5m, the height of the upper packing layer is 3m, and the tower diameter is 0.8m; The gas feed inlet of the lower section, which is arranged with liquid level gauge, temperature sensor and pressure sensor) enters the absorption tower, and flows from bottom to top in the absorption tower; at the same time, the absorbent NMP enters from the middle feed inlet of the absorption tower (flow rate 300kg / h), and absorb from top to bottom in countercurrent contact with the exhaust gas...

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Abstract

The invention belongs to the technical field of waste gas treatment, and discloses an efficient low-loss solvent and process used for absorbing toluene. The solvent is NMP which is easy to obtain, high in absorbing efficiency and high in absorption saturability, an absorption enriched solution can be recycled, and the loss of the solvent is low. The process relates to an absorption tower divided into two segments, and two regeneration towers. In the lower segment of the absorption tower, the solvent NMP is adopted first to absorb and remove the toluene in waste gas, the tail gas obtained afterabsorption can carry a few amount of NMP and enters the upper segment of the absorption tower, and water as a solvent is used for absorbing the NMP in the tail gas obtained after absorption; the absorption enriched solution enters the first regeneration tower and the second regeneration tower separately to make the solvent regenerated. The absorption process is high in safety, simple in technology, and easy to operate and maintain.

Description

technical field [0001] The invention belongs to the technical field of waste gas treatment, and in particular relates to a high-efficiency and low-loss solvent and a process for absorbing toluene. Background technique [0002] In modern industrial production, some toxic and harmful waste gas will inevitably be produced along with the production process. If the exhaust gas is directly discharged into the atmosphere, it will not only cause environmental pollution, but also endanger human life. Exhaust gas has many direct hazards to the human body. The main impacts on the human body are odor, sensory, mucosal stimulation and other process toxicity caused by morbidity, genotoxicity and carcinogenicity. Exhaust gas usually has a certain pungent smell. When it reaches a certain concentration in the environment, it can cause headaches, nausea, and vomiting in a short period of time. In severe cases, convulsions and coma may occur, causing damage to the liver, brain and nerve cent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18
CPCB01D53/1406B01D53/1412B01D53/1425B01D53/1487B01D53/1493B01D53/185B01D2252/103B01D2252/205B01D2257/7027B01D2258/02
Inventor 杨思宇张银双郭超
Owner SOUTH CHINA UNIV OF TECH
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