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A technology for organic waste gas and recovery methods, applied in separation methods, chemical instruments and methods, steam condensation, etc., can solve problems such as secondary pollution, high cost of wastewater reprocessing, and reduced recovery efficiency
Inactive Publication Date: 2008-02-20
蔡志煌
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[0004] The problem with this recovery method is that the desorption wastewater still contains a certain amount of organic solvents, such as organic solvents with a boiling point or azeotropic point below 95°C. These organic solvents are discharged with the wastewater, which reduces the recovery efficiency and costs of wastewater retreatment. High, easy to cause secondary pollution
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[0017] As shown in Figure 2, it is the first embodiment of the organic waste gas recovery method disclosed by the present invention. The organic waste gas is first pretreated by the filter 1 and the cooler 2 (or through the filter 1 again), and then enters through the induced draft fan 3 The adsorption tank 4 performs adsorption, and after the adsorption is saturated, the mixed gas is desorbed and regenerated with water vapor, and the desorbed mixed gas is condensed by the condenser 5, and then enters the oil-water separator 6 to separate the solvent and waste water. The improvement of the present invention is to add a partition heat exchange wastewater heater 8 after the adsorption tank 4 and before the condenser 5; The residual heat of the water vapor is heated through the heat exchange between the partition walls, and after heating to 2-10 °C above the boiling point or azeotropic point of the organic solvent, the organic solvent is fully evaporated, and the residual solvent ...
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Abstract
The present invention discloses a recovery method of the organic waste gas, which comprises the following steps: firstly, the organic waste gas is pretreated in a strainer and a cooler; secondly, adsorbed by an adsorption tank, then desorbed by the water vapor after having a saturated adsorption, the desorbed mixed gas is condensed by the condenser again, then came into an oil-water separator, separating the solvent and the waste water; a dividing wall type heat exchange waste water heater is added between the adsorption tank and the condenser; the waste water separated from the oil-water separator is sent to the waste water heater, utilizing the excess heat of the water vapor desorbed from the adsorption tank, heated by the dividing wall type heat exchange, vaporizing the remnants solvent of the waste water; the solvent after vaporizing has a recycle treatment, the rest waste water after vaporizing comes into another active carbon absorber or sewerage station, adsorbing the micro-solvent of the sewerage until coming up to the standards, then being drained. The present invention utilizes the most of the excess heat of the water vapor desorbed from the adsorption tank to heat the sewerage, reduces the organic solvent content of the sewerage, enhances the recovery efficiency, reduces the reprocessing cost of the sewerage, and reduces the secondary pollution.
Description
technical field [0001] The invention belongs to a recovery method of industrial organic waste gas, and relates to a treatment technology of adopting active carbon to absorb organic waste gas and desorption recovery treatment and desorption waste water. This recovery method can be used to recover and process benzene, toluene, xylene, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone, styrene, trichloroethylene, dichloroethylene, n-hexane, cyclohexane, gasoline...etc. A variety of organic solvent waste gas, which recycles the organic waste gas that polluted the atmosphere and turns it into liquid for reuse. technical background [0002] A large amount of organic solvents are used in industrial production processes such as rubber, chemicals, electronics, tapes, printing and dyeing, tanning, gluing, and printing, and these solvents are discharged in the form of waste gas. At present, domestic organic waste gas treatment methods include: incineration treatment, concentr...
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