CN100425314C - Process of purifying and recovering waste gas containing volatile organic compound and its application - Google Patents
Process of purifying and recovering waste gas containing volatile organic compound and its application Download PDFInfo
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- CN100425314C CN100425314C CNB2006101610128A CN200610161012A CN100425314C CN 100425314 C CN100425314 C CN 100425314C CN B2006101610128 A CNB2006101610128 A CN B2006101610128A CN 200610161012 A CN200610161012 A CN 200610161012A CN 100425314 C CN100425314 C CN 100425314C
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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
The present invention relates to a kind of purification, recovery method and application thereof that contains volatile organic compound from waste gas, particularly relate to a kind of by the recovery method that contains volatile organic compound from waste gas and the application thereof that emit in printing machine, dyeing machine and the reactor.
Background technology
At present, owing in printing-ink, contain volatile organic solvent, as: ethanol, ethyl acetate, ethylene glycol ethyl ether, toluene, dimethylbenzene, acetone, butanone and ink oil, seal paper money oil, kerosene, gasoline or the like.Machine room in the printing house, just the paper of printing will pass through drying course, make the ink setting film forming that is printed onto on the paper, therefore a large amount of volatile organic solvents are along with the rising of temperature is all volatilized, and mix with air, carry out emptying then, so not only caused serious pollution to air, people's health has been brought severe impairment, and these organic solvents can not be reused, and printing enterprise will drop into a large amount of funds and buy these organic solvents, have therefore brought heavy financial burden to enterprise, seriously influence economic benefit of enterprises, also caused the waste of resource simultaneously.
At present, component more complicated in the dyestuff contains the volatile organic solvent of pigment, surfactant, Ester and dissolving above-mentioned substance usually, as: alkanes material, ether material and alcohols material etc.Printing and dyeing workshop in printing and dyeing mill, the fabric of just printing and dyeing out will pass through drying course, make the color dryness finalization on the fabric of printing and dyeing, therefore a large amount of volatile organic solvents are along with the rising of temperature is all volatilized, and mix with air, carry out emptying then, so not only caused serious pollution to air, people's health has been brought severe impairment, and these organic solvents can not be reused, printing and dyeing enterprise will drop into a large amount of funds and buy these organic solvents, therefore bring heavy financial burden to enterprise, seriously influence economic benefit of enterprises.
In the reactor (as extractive reaction still, rectification process still etc.) of chemical industry and pharmacy industry, also can give off volatile organic solvent, these solvents directly carry out emptying, so not only caused serious pollution to air, people's health has been brought severe impairment, and these organic solvents can not reuse, and chemical industry and pharmacy corporation will drop into a large amount of funds and buy these organic solvents, therefore bring heavy financial burden to enterprise, seriously influenced economic benefit of enterprises.
China Patent No. ZL01109295.5 discloses gas recovery method and device, wherein disclose water and absorbed VOC, and then carry out freezing with separate, though this method cost recovery is lower, but it is well-known, a lot of organic solvents are water insoluble, or are slightly soluble in water, so this method is confined to commute, and to be dissolved in the assimilation effect of VOC of water better.
China Patent No. ZL02805902.6 discloses by the charcoal adsorbent bed and has reclaimed VOC, wherein disclose VOC has been passed through absorbent charcoal adsorber, the method that VOC is reclaimed, if handle the organic compound that from printing machine and dyestuff machine, evaporates with this method and apparatus, because the organic compound that evaporates from printing machine and dyestuff machine has a large amount of fibers and high molecular polymer as resin, these VOCs directly enter the destruction that absorbent charcoal adsorber can cause the absorbent charcoal adsorber irreversibility, and from printing machine, the temperature of the organic compound that evaporates in dyestuff machine and the reactor is very high usually, and these VOCs directly enter absorbent charcoal adsorber can cause the active reduction of active carbon and the lost of life.
Summary of the invention
The object of the present invention is to provide a kind of purification, recovery method and application thereof that contains the waste gas of VOC, it has overcome the defective of prior art.
In order to realize purpose of the present invention, the method that a kind of recovery of the present invention contains VOC comprises:
(1) collects the waste gas that contains VOC;
(2) above-mentioned waste gas is sent into be cooled to 35-40 ℃ in the cooler after, send into filter and filter;
(3) measure the temperature of filtering back waste gas, if the temperature of waste gas greater than 30 ℃, is sent waste gas into continuation cooling in the cooler, cooled waste gas is sent in the absorber and is adsorbed; If EGT is less than 30 ℃, waste gas directly sent in the absorber adsorb;
(4) with saturated vapor the waste gas of absorption is carried out desorption, the gas-liquid mixture behind the desorption sends into that condensation is cooled to below 40 ℃ in the condensate cooler;
(5) the cooled mixture of above-mentioned condensation is carried out gas-liquid separation in gas-liquid separator, the gas of separating is sent in the cooler of step (2), again water-fast VOC in the mixed liquor is separated with water-soluble VOC, reclaim water-fast and water-soluble VOC respectively;
A kind of method that reclaims VOC of the present invention, wherein: after the water-soluble VOC in the above-mentioned steps (5) continued to be fed into heater and heat up, send into rectifying column and carry out rectifying, the gas-liquid mixture that obtains, then above-mentioned gas-liquid mixture is sent into condensate cooler successively, after carrying out condensation cooling and gas-liquid separation in the gas-liquid separator, gas enters air, the concentration of the mixed liquor after the measurement gas-liquid separation, when the concentration of mixed liquor reaches requirement, mixture cooling back is stored, when the concentration of mixed liquor did not reach requirement, this mixed liquor returned rectifying column and proceeds rectifying;
A kind of method that reclaims VOC of the present invention, wherein: after described water-soluble VOC is sent into heater and is warmed up to 40-50 ℃, send into rectifying column, the rectification temperature in the rectifying column is greater than the boiling point of water-soluble VOC, less than the boiling point of water;
A kind of method that reclaims VOC of the present invention, wherein: described rectifying column uses the superheated steam of 0.1-0.4MPa water vapour as heating source;
A kind of method that reclaims VOC of the present invention, wherein: the desorption in the above-mentioned steps (3) is that the superheated steam with 0.1-0.4MPa is blown in the absorber, the VOC that is adsorbed in the absorber is blown out, VOC carries out the condensation cooling along with steam enters condensate cooler together, then, with the air blow drying absorber or without air blow drying but directly carry out the absorption of next cycle;
A kind of method that reclaims VOC of the present invention, wherein: described absorber comprises two at least, wherein: at least one carries out adsorption operations, and other absorber carries out desorption manipulation, and absorber is the absorber that granular activated carbon or NACF are housed;
A kind of method that reclaims the VOC that contains in the waste gas of the present invention, wherein: the filtration in the above-mentioned steps (2) comprises: send into earlier and carry out the particle filtration in the particulate filter, sending into two steps of carrying out macromolecular filtering in the macromolecular filtering device again filters, described particulate filter is a bag filter, and described macromolecular filtering device is the filter that active carbon is housed;
A kind of application of reclaiming the method for the VOC that contains in the waste gas of the present invention, wherein: this method is used for reclaiming the VOC that contains from the waste gas that printing machine, dyestuff machine and reactor are discharged;
A kind of recovery of the present invention contains the application of the method for VOC, and wherein: described printing machine comprises: letterpress, intaglio press or offset machine;
A kind of application of reclaiming the method for the VOC that contains in the waste gas of the present invention, wherein: described printing machine is a money press.
The method of the VOC that contains in the recovery waste gas of the present invention is compared with the existing method that reclaims organic compound from waste gas, its advantage is: 1. method of the present invention can reclaim the water-soluble or water-fast volatile organic compound from waste gas that contains, and it is wider to reclaim the scope that contains volatile organic compound from waste gas; 2. because the present invention has increased cooling and filtration step before carrying out adsorption step, therefore increase the organic efficiency of equipment, increased the service life of equipment simultaneously.; 3. after desorbing gas is finished, can carry out the air drying, also can not carry out drying and directly carry out the absorption of next cycle sorbing material, so process choice flexibility height; 4. this method has solved the exhaust emission problem of long-term puzzlement people's printing machine, dyeing machine and reactor, not only solved the air severe contamination that printing machine, dyeing machine and reactor cause with this method, and the VOC that reclaims can repetitive cycling use, and brought huge economic benefit to enterprise.
Description of drawings
Fig. 1 is the flow chart of the method for the VOC that contains in the recovery waste gas of the present invention.
The specific embodiment
Embodiment 1
As shown in Figure 1, the present invention reclaims the method that contains volatile organic compound from waste gas from the printing machine of printing cigarette yew paper, and yew paper is cigarette filter outsourcing dedicated paper, is one of requisite material in the cigarette producing process.Yew paper is mainly used in the acetate fiber of parcel tar adsorption, plays attractive in appearance and effect that be convenient to aspirate.In the print production technology of printing yew paper, to use a large amount of ethanol and a spot of ethyl acetate, organic solvents such as ethylene glycol ethyl ether, be used to dissolve macromolecule resin, coating with the process of hot-air drying and forming-film in organic solvent all volatilize, reclaim the above-mentioned ethanol that contains, the method of the waste gas of ethyl acetate and ethylene glycol ethyl ether comprises: collect the above-mentioned ethanol that contains with gatherer, the waste gas of ethyl acetate and ethylene glycol ethyl ether, these waste gas comprise a large amount of ethanol and a spot of ethyl acetate, ethylene glycol ethyl ether and the printing paper scrap of carrying secretly and the macromolecule resin of dissolving, after being cooled to above-mentioned waste gas about 40 ℃, send into earlier and carry out the particle filtration in the bag filter, filter out paper scrap and the particulate material carried secretly in the waste gas, send into again carry out resin filter in the active carbon filter after, measure the temperature of filtering back waste gas, if the temperature of waste gas is greater than 30 ℃, waste gas is sent into continuation cooling in the cooler, and cooled waste gas is sent in the carbon fiber adsorption and catalytic combustion device and is adsorbed; If EGT is less than 30 ℃, waste gas directly sent in the charcoal fiber absorber adsorb, ethanol, ethyl acetate and ethylene glycol ethyl ether are attracted in the carbon fiber adsorption and catalytic combustion device, after absorber is filled above-mentioned waste gas, with superheated vapour the waste gas that adsorbs is carried out desorption, desorption is to be blown in the absorber with the 0.4MPa superheated steam, with the ethanol that is adsorbed in the absorber, ethyl acetate and ethylene glycol ethyl ether blow out, ethanol, ethyl acetate and ethylene glycol ethyl ether carry out the condensation cooling along with water vapour enters condensate cooler together, then, use the air blow drying absorber, in order to make adsorption process uninterrupted continuously, preferably include at least two absorbers, wherein: at least one carries out adsorption operations, other absorber carries out desorption manipulation, and the quantity of absorber depends on the capacity of treatment of waste gas amount and absorber, and the gas-liquid mixture behind the desorption sends into that condensation is cooled to below 40 ℃ in the condensate cooler; The cooled mixture of above-mentioned condensation is carried out gas-liquid separation in gas-liquid separator, the waste gas of collecting in gas of separating and the printing machine is mixed together and enters in the above-mentioned cooler, again water-fast ethyl acetate in the mixed liquor of separating is separated with water-soluble ethanol with ethylene glycol ethyl ether, reclaim water-fast ethyl acetate and diethanol ether and water-soluble ethanol respectively, because ethanol is water-soluble, the gas phase that contains ethanol that blows out with water vapour is in condensation process, a large amount of water has condensed, therefore, the content of ethanol is lower this moment, be not suitable for recycling, should carry out following concentration step again: after being about to water-soluble ethanol and continuing to be fed into heater and be warmed up to about 50 ℃, send into rectifying column again and carry out rectifying, rectifying column uses the 0.3MPa water vapour as heating source, vapo(u)rizing temperature in the rectifying column is about 83 ℃, under this temperature, ethanol evaporates in a large number, the also evaporation thereupon of a spot of water is arranged simultaneously, obtain the gas-liquid mixture of second alcohol and water, then above-mentioned gas-liquid mixture is sent into condensate cooler successively, after carrying out condensation cooling and gas-liquid separation in the gas-liquid separator, gas enters air, concentration of alcohol after the measurement gas-liquid separation in the mixed liquor, when the concentration of alcohol in the mixed liquor reaches 85%, mixture cooling back is stored, when the concentration of alcohol of mixed liquor did not reach 85%, this mixed liquor returned rectifying column and proceeds rectifying.
In general, if contain the words of the organic compound of multiple composition in the water-soluble mixed liquor, rectification temperature is greater than the boiling point of the highest composition of all the components mid-boiling point usually, the aforesaid operations data are all selected according to concrete technological requirement, these are selected for the person of ordinary skill of the art, are easy to accomplish.
Embodiment 2
As shown in Figure 1, the present invention reclaims the method that contains volatile organic compound from waste gas from common printed machine, according to different print requests, the kind of the printing ink of printing usefulness is variant, the kind that contains volatile organic compound from waste gas of discharging from printing machine is also inequality, only illustrates in this embodiment.In print production technology, to use a large amount of acetone and organic solvents such as a spot of toluene and dimethylbenzene, be used for dissolving the printing ink macromolecule resin, coating with the process of hot-air drying and forming-film in organic solvent all volatilize, reclaiming the above-mentioned method that contains volatile organic compound from waste gas comprises: collect above-mentioned acetone with gatherer, the waste gas of toluene and dimethylbenzene, these waste gas comprise a large amount of acetone, a spot of toluene and dimethylbenzene and the printing paper scrap of carrying secretly, the macromolecule resin and the titanium dioxide of dissolving, after being cooled to above-mentioned waste gas about 40 ℃, send into earlier and carry out the particle filtration in the bag filter, filter out paper scrap and the titanium dioxide carried secretly in the waste gas, send into again carry out resin filter in the active carbon filter after, measure the temperature of filtering back waste gas, if the temperature of waste gas is greater than 30 ℃, waste gas is sent into continuation cooling in the cooler, and cooled waste gas is sent in the active carbon adsorber and is adsorbed; If EGT is less than 30 ℃, waste gas directly sent in the active carbon adsorber adsorb, acetone, toluene and dimethylbenzene are attracted in the active carbon adsorber, after absorber is filled above-mentioned waste gas, with saturated vapor the waste gas that adsorbs is carried out desorption, desorption is to be blown in the absorber with the 0.3MPa water vapour, with the acetone that is adsorbed in the absorber, toluene and dimethylbenzene blow out, acetone, toluene and dimethylbenzene carry out the condensation cooling along with saturated vapor enters condensate cooler together, then, compressed air with 0.2MPa dries up absorber, in order to make adsorption process uninterrupted continuously, preferably include at least two absorbers, the quantity of absorber depends on the capacity of treatment of waste gas amount and absorber, wherein: at least one carries out adsorption operations, and other absorber carries out desorption manipulation, the acetone behind the desorption, toluene and dimethylbenzene gas-liquid mixture send into that condensation is cooled to below 40 ℃ in the condensate cooler; The cooled mixture of above-mentioned condensation is carried out gas-liquid separation in gas-liquid separator, the waste gas of collecting in gas of separating and the printing machine is mixed together and enters in the cooler, again water-fast toluene in the mixed liquor of separating is separated with water-soluble acetone with dimethylbenzene, reclaim water-fast toluene and dimethylbenzene and water-soluble acetone respectively, because acetone is water-soluble, the waste gas that contains acetone that blows out with saturated vapor is in condensation process, a large amount of water has condensed, therefore, the content of acetone is lower this moment, be not suitable for recycling, should carry out following concentration step again: after being about to water-soluble acetone and continuing to be fed into heater and be warmed up to about 40 ℃, send into rectifying column again and carry out rectifying, rectifying column uses the 1.5MPa saturated vapor as heating source, vapo(u)rizing temperature in the rectifying column is about 65 ℃, under this temperature, acetone evaporates in a large number, the also evaporation thereupon of a spot of water is arranged simultaneously, obtain the gas-liquid mixture of acetone and water, then above-mentioned gas-liquid mixture is sent into condensate cooler successively, after carrying out condensation cooling and gas-liquid separation in the gas-liquid separator, gas enters air, acetone concentration after the measurement gas-liquid separation in the mixed liquor, when the acetone concentration in the mixed liquor reaches 90%, mixture cooling back is stored, when the acetone concentration in the mixed liquor did not reach 90%, this mixed liquor returned rectifying column and proceeds rectifying.
Embodiment 3
As shown in Figure 1, the present invention reclaims the method that contains volatile organic compound from waste gas from money press, usually use water-fast seal paper money oil to dissolve printing ink in the money press, seal paper money oil belongs to the cut of mineral oil oil, it contains kerosene, linear paraffin, the organic compound that cycloalkane etc. are easy to volatilize, organic solvent all volatilizees in the process of coating drying and forming-film, seal paper money workshop smell is bigger, reclaiming the above-mentioned method that contains the waste gas of seal paper money oil comprises: collect the above-mentioned waste gas that contains seal paper money oil with gatherer, these waste gas comprise: seal paper money oil and the printing paper scrap of carrying secretly and the macromolecule resin of dissolving, after being cooled to above-mentioned waste gas about 40 ℃, send into earlier and carry out the particle filtration in the bag filter, filter out the paper scrap of carrying secretly in the waste gas, send into again carry out resin filter in the active carbon filter after, the temperature of measure filtering back waste gas is if the temperature of waste gas is greater than 30 ℃, waste gas is sent into continuation cooling in the cooler, and cooled waste gas is sent in the charcoal fiber absorber and is adsorbed; If EGT is less than 30 ℃, waste gas directly sent in the active carbon adsorber adsorb, seal paper money oil is attracted in the granular active carbon absorber, after absorber is filled above-mentioned waste gas, with saturated vapor the waste gas that adsorbs is carried out desorption, desorption is to be blown in the absorber with the 0.4MPa water vapour, the seal paper money oil that is adsorbed in the absorber is blown out, seal paper money oil carries out the condensation cooling along with saturated vapor enters condensate cooler together, then, compressed air with 0.2MPa dries up absorber, in order to make adsorption process uninterrupted continuously, preferably include at least two absorbers, the quantity of absorber depends on the capacity of treatment of waste gas amount and absorber, wherein: at least one carries out adsorption operations, and other absorber carries out desorption manipulation; Gas-liquid mixture behind the desorption sends into that condensation is cooled to below 40 ℃ in the condensate cooler; The cooled mixture of above-mentioned condensation is carried out gas-liquid separation in gas-liquid separator, the waste gas of collecting in gas of separating and the money press is mixed together and enters in the cooler, to separate in the mixed liquor water-fast seal paper money oil again and from water, separate storage, reuse.
Below only lifted three examples the method that contains volatile organic compound from waste gas that reclaims has been described, but in fact, this method is not limited only to above-mentioned three application that example is mentioned, it also can be used for the recovery of the waste gas that emits from dyeing machine with from pharmacy industry, chemical industry reactor, though, the kind of the waste gas of discharging from above-mentioned each equipment has nothing in common with each other, but its recovery principle is identical.
More than describing is explanation of the invention, is not limitation of the invention, and institute of the present invention restricted portion is referring to claim, and under the situation of spirit of the present invention, the present invention can do any type of modification.
Claims (8)
1. method that reclaims the VOC that contains in the waste gas, it is characterized in that: it comprises:
(1) collects the waste gas that contains VOC;
(2) above-mentioned waste gas is sent into be cooled to 35-40 ℃ in the cooler after, send into filter and filter;
(3) measure the temperature of filtering back waste gas, if the temperature of waste gas greater than 30 ℃, is sent waste gas into continuation cooling in the cooler, cooled waste gas is sent in the absorber and is adsorbed; If EGT is less than 30 ℃, waste gas directly sent in the absorber adsorb;
(4) with the 0.1-0.4MPa water vapour waste gas of absorption is carried out desorption, the gas-liquid mixture behind the desorption sends into that condensation is cooled to below 40 ℃ in the condensate cooler;
(5) the cooled mixture of above-mentioned condensation is carried out gas-liquid separation in gas-liquid separator, the gas of separating is sent in the cooler of step (2), again water-fast VOC in the mixed liquor is separated with water-soluble VOC, reclaim water-fast and water-soluble VOC respectively; After water-soluble VOC in the above-mentioned steps continued to be fed into heater and heat up, send into rectifying column and carry out rectifying, obtain gas-liquid mixture, then above-mentioned gas-liquid mixture is sent into successively carry out condensation cooling and gas-liquid separation in cooler, the gas-liquid separator after, gas enters air, the concentration of the mixed liquor after the measurement gas-liquid separation, when the concentration of mixed liquor reaches requirement, mixture cooling back is stored, when the concentration of mixed liquor did not reach requirement, this mixed liquor returned rectifying column and proceeds rectifying; Rectification temperature in the rectifying column is greater than the boiling point of water-soluble VOC with less than the boiling point of water.
2. the method for the VOC that contains in the recovery waste gas as claimed in claim 1 is characterized in that: described rectifying column uses the water vapour of 0.1-0.4MPa as heating source.
3. the method for the VOC that contains in the recovery waste gas as claimed in claim 1, it is characterized in that: the desorption in the above-mentioned steps (4) is to be blown in the absorber with the 0.1-0.4MPa water vapour, the VOC that is adsorbed in the absorber is blown out, contain VOC and carry out the condensation cooling along with water vapour enters condensate cooler together, then, with the air blow drying absorber or without air blow drying but directly carry out the absorption of next cycle.
4. the method for the VOC that contains in the recovery waste gas as claimed in claim 1, it is characterized in that: described absorber comprises two at least, wherein: at least one carries out adsorption operations, other absorber carries out desorption manipulation, and absorber is the absorber that active carbon or NACF are housed.
5. the method for the VOC that contains in the recovery waste gas as claimed in claim 1, it is characterized in that: the filtration in the above-mentioned steps (2) comprises: send into earlier and carry out the particle filtration in the particulate filter, sending into two steps of carrying out macromolecular filtering in the macromolecular filtering device again filters, described particulate filter is a bag filter, and described macromolecular filtering device is the filter that active carbon is housed.
6. the application of the method for the VOC that contains in the recovery waste gas as claimed in claim 1 is characterized in that: this method is used for reclaiming the VOC that contains from the waste gas that printing machine, dyestuff machine and reactor are discharged.
7. the application of the method for the VOC that contains in the recovery waste gas as claimed in claim 6 is characterized in that: described printing machine comprises: letterpress, offset press, intaglio press, porous printer or offset machine.
8. the method for the VOC that contains in recovery as claimed in claim 7, the purifying exhaust air is characterized in that: described printing machine is a money press.
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