Efficient energy-saving purification and recovery process of tail gas containing volatile organic compounds (VOCs)

A volatile organic compound, high-efficiency and energy-saving technology, used in air quality improvement, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as atmospheric environmental quality decline, human health hazards, etc. The effect of reuse

Inactive Publication Date: 2015-04-22
TIANJIN AOZHAN XINGDA TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of industrial waste gas is discharged into the atmosphere, which will inevitably reduce the quality of the atmospheric environment and bring serious harm to human health.

Method used

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  • Efficient energy-saving purification and recovery process of tail gas containing volatile organic compounds (VOCs)
  • Efficient energy-saving purification and recovery process of tail gas containing volatile organic compounds (VOCs)
  • Efficient energy-saving purification and recovery process of tail gas containing volatile organic compounds (VOCs)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) The tail gas of a pharmaceutical company contains butyl acetate (immiscible with water). According to the needs of the follow-up section, the butyl acetate in the tail gas needs to be removed to 10mg / m 3 Below, the mass fraction of n-butyl acetate in the raw material tail gas is <1%;

[0025] 2) Using N-methylpyrrolidone as a solvent to purify the tail gas, the suction temperature of the gas to be treated is 25°C, and the content of n-butyl acetate in the liquid entering the absorption tower is less than 1%;

[0026] 3) if figure 1 As shown, the raw material tail gas enters the absorption tower T101 from the raw material inlet at the bottom of the absorption tower. The operating conditions of the absorption tower T101 are normal temperature and normal pressure. In T101, water enters from the water inlet pipe located at the upper end of packing 1 of absorption tower T101, and in the absorption tower T101, it is in reverse contact with the tail gas of raw materials. M...

Embodiment 2

[0031] 1) The gas source for treatment is the same as in Example 1, and the absorption solvent is N-methylpyrrolidone and N-formylmorpholine, which are mixed at a mass ratio of 1:1 to prepare a mixed solvent to purify the tail gas. The suction temperature of the gas to be treated is 28°C. The content of butyl acetate in the liquid entering the absorption tower is less than 1%;

[0032] 2) After purification, the content of butyl acetate in the purified gas exiting the absorption tower is reduced to 5 mg / m 3 the following;

[0033] 3) Recovery tower T102, the temperature at the bottom of the tower is 171°C, the temperature at the top of the tower is 45°C, the reflux ratio is 4, the operating pressure is 0.03MPA (A), and other operating conditions are the same as in Example 1.

Embodiment 3

[0035] 1) The tail gas of a chemical company contains toluene and xylene. According to the emission requirements, the toluene and xylene in the tail gas should be removed to 10mg / m 3 , the mass fraction of toluene and xylene in the raw material tail gas is <1%;

[0036] 2) Using N-methylpyrrolidone as a solvent to purify the tail gas, the suction temperature of the gas to be treated is 25°C, and the content of toluene and xylene in the liquid entering the absorption tower is <1%;

[0037] 3) The raw material tail gas enters the absorption tower T101 from the raw material inlet 1 at the bottom of the tower. The condition of the absorption tower T101 is normal temperature and normal pressure operation, and the solvent used for purifying the tail gas enters the absorption tower T101 through the solvent pipeline located at the upper end of the packing 2 of the absorption tower. , water enters from the water inlet pipe at the upper end of the filler 1 of the absorption tower T101, an...

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Abstract

The invention provides an efficient energy-saving purification and recovery process of tail gas containing volatile organic compounds (VOCs). The tail gas to be treated enters from the bottom of an absorption tower, is subjected to a first step of solvent absorption to remove the VOCs, continues rising and is subjected to a second step of water absorption to remove absorption solvent entrained in the tail gas, and finally the purified tail gas is exhausted from the top of the absorption tower; solvent having absorbed the VOCs and water having absorbing the solvent enter a vacuum distillation recovery tower together to be recovered and regenerated, and regenerated water and regenerated solvent return to the absorption tower to be recycled. By means of the process, the tail gas containing the VOCs can be purified, the VOCs can be recycled, and the gas can meet emission standards stated in environmental regulations; generated heat is transferred in time in the absorption process to improve the absorption effect, and the recovered solvent and the recovered water can be recycled and are stable, free of toxicity and corrosiveness, easy to recover and small in loss.

Description

technical field [0001] The present invention belongs to the technical field of chemical industry, and relates to coal chemical industry, oil refining, petrochemical industry, fine chemical industry, pharmacy, printing, paint, ink and other fields containing acetone, methanol, ethanol, benzene, toluene, xylene, butanol, butyl ester, etc. Purification and recycling of one or more kinds of organic tail gas, especially relates to a high-efficiency and energy-saving purification and recycling process of volatile organic tail gas. Background technique [0002] Air pollution is one of the most prominent environmental problems in my country at present, and industrial waste gas is an important source of air pollutants. A large amount of industrial waste gas is discharged into the atmosphere, which will inevitably reduce the quality of the atmospheric environment and bring serious harm to human health. The most difficult thing to deal with in industrial waste gas is organic waste gas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/18
CPCY02A50/20
Inventor 张兵李建明阮杰张春璐安喜报刘佳
Owner TIANJIN AOZHAN XINGDA TECH
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