Process of purifying and recovering waste gas containing volatile organic compound and its application

Abstract

The present invention relates to purification, recovery and application of waste gas containing volatile organic compound, and the process includes collecting waste gas containing volatile organic compound, cooling the waste gas and filtering in the filter, measuring the temperature of the filtered waste gas and further cooling to below 30 deg.c, adsorbing cooled waste gas in the adsorber, desorbing the adsorbed waste gas with water vapor, condensating and cooling the desorbed gas-liquid mixture in the condensate cooler, gas-liquid separating the condensated and cooled mixture in the gas-liquid separator, mixing the separated gas and the collected waste gas and feeding the gas mixture into the cooler, and recovering water insoluble volatile organic compound and water soluble volatile organic compound separately. The process is used to eliminate air pollution of printing machine, dyeing machine and reaction kettle while creating great economic benefit.

Description

technical field [0001] The present invention relates to a method for purifying and recovering waste gas containing volatile organic compounds and its application, in particular to a method for recovering waste gas containing volatile organic compounds discharged from printing machines, printing and dyeing machines and reaction kettles and its application . Background technique [0002] At present, due to the volatile organic solvents contained in printing inks, such as: ethanol, ethyl acetate, ethylene glycol ether, toluene, xylene, acetone, methyl ethyl ketone and ink oil, banknote printing oil, kerosene, gasoline and so on. In the printing workshop of the printing factory, the newly printed paper has to go through the drying process to make the ink printed on the paper dry and form a film, so a large amount of volatile organic solvents are all volatilized with the increase of temperature and mixed with air, and then Evacuation will not only cause serious pollution to the ...

AI Technical Summary

Problems solved by technology

In the printing and dyeing workshop of the printing and dyeing factory, the fabrics that have just been printed and dyed have to go through the drying process to make the colors printed and dyed on the fabrics dry and finalized. Therefore, a large amount of volatile organic solvents evaporate with the increase of temperature and mix with the air. Then it is emptied, which not only causes serious pollution to the air, but also brings serious damage to people's health, and these organic solvents cannot be repeated. Printing and dyeing companies will invest a lot of money to buy these organic solvents, so it will bring more pollution to the company. A heavy economic burden has seriously affected the economic benefits of enterprises

[0004] In the reactors of the chemical industry and the pharmaceutical industry (such as extraction reactors, rectification reactors, etc.), volatile organic solvents are also emitted, and these solvents are directly emptied, which not only causes serious pollution to the air, but also causes people to The health of the company has brought serious damage, and these organic solvents cannot be repeated. Chemical and pharmaceutical companies have to invest a lot of money to buy these organic solvents, which has brought a heavy economic burden to the company and seriously affected the economic benefits of the company.

[0005] Chinese Patent No. ZL01109295.5 discloses a waste gas recovery method and device, which discloses the absorption of volatile organic gases with water, and then freezes and separates them. Although the recovery cost of this method is low, it is well known that many organic solvents are insoluble in water. Or slightly soluble in water, so this method is only limited to the absorption of volatile organic gases that are easily soluble in water.

[0006] Chinese Patent No. ZL02805902.6 discloses the recovery of volatile organic compounds by carbon adsorption bed, which discloses the method of passing the volatile organic compounds through the activated carbon adsorption device to recover the volatile organic compounds. And the organic compounds volatilized from the dyeing machine, because the organic compounds volatilized from the printing machine and dyeing machine contain a lot of fibers and high molecular polymers such as: resin, these volatile organic compounds directly enter the activated carbon adsorption device will cause activated carbon Irreversible damage to the adsorption device, and the temperature of the organic compounds volatilized from the printing machine, dyeing machine and reaction kettle is usually high, and these volatile organic compounds directly enter the activated carbon adsorption device, which will lead to reduced activity of activated carbon and shortened life

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