CN114904363A - Method for treating waste gas containing ethylene oxide - Google Patents
Method for treating waste gas containing ethylene oxide Download PDFInfo
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- CN114904363A CN114904363A CN202111048387.4A CN202111048387A CN114904363A CN 114904363 A CN114904363 A CN 114904363A CN 202111048387 A CN202111048387 A CN 202111048387A CN 114904363 A CN114904363 A CN 114904363A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/72—Organic compounds not provided for in groups B01D53/48 - B01D53/70, e.g. hydrocarbons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
- B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
- B26D1/547—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member
- B26D1/553—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a wire-like cutting member with a plurality of wire-like cutting members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention relates to the technical field of chemical industry, in particular to a method for treating waste gas containing ethylene oxide, which comprises the following steps: introducing waste gas containing ethylene oxide into an absorption tank to be contacted and absorbed with an absorbent, discharging the absorbed waste gas from the top of the absorption tank, introducing the waste gas into a hydrolysis tank to perform hydrolysis reaction, discharging the hydrolyzed waste gas from the upper part of the hydrolysis tank, and introducing the hydrolyzed waste gas into an RTO waste gas treatment device; the medium of the hydrolysis tank is acid liquor with the pH value of 1-2. The waste gas containing the ethylene oxide is sequentially introduced into the absorption tank, the hydrolysis tank and the RTO waste gas treatment device for treatment, the absorption tank is used for removing most of the ethylene oxide in the waste gas, the hydrolysis tank utilizes the characteristic that the ethylene oxide rapidly reacts with water in an acidic aqueous solution to generate ethylene glycol, so that the waste gas with extremely low content of the ethylene oxide waste gas is obtained, and the RTO waste gas treatment device is used for efficiently and safely purifying the ethylene oxide waste gas and has a good market prospect.
Description
Technical Field
The invention relates to the technical field of chemical industry, in particular to a method for treating waste gas containing ethylene oxide.
Background
Ethylene oxide is a very important fine chemical raw material, can derive various fine chemical products such as ethylene glycol, nonionic surfactant, ethanolamine, glycol ether and the like, can further extend and synthesize four or five thousand products such as detergents, emulsifiers, antifreeze agents, plasticizers, lubricants, insecticides, fumigants and the like, and has extremely wide application field; however, ethylene oxide can pollute the atmosphere, is flammable, toxic and irritant, and has an explosion limit range of 3% -100%. Therefore, in order to ensure the production safety and environmental protection, the waste gas containing ethylene oxide must be treated efficiently and safely.
At present, pure water is used as an absorbent for industrially absorbing ethylene oxide, but the absorption effect is poor and the operation flexibility is small. Meanwhile, the absorption capacity of ethylene oxide absorption towers of many domestic enterprises cannot meet the design requirement, and the content of residual ethylene oxide in the absorption tail gas at the top of the absorption tower exceeds the standard, so that a great deal of material loss is caused.
Disclosure of Invention
In order to solve the above-mentioned problems, the present invention provides a method for treating an ethylene oxide-containing exhaust gas, comprising the steps of firstly absorbing most of ethylene oxide with ethylene carbonate according to the property of ethylene oxide having good solubility in ethylene carbonate, then utilizing the characteristic that ethylene oxide can react with water in an acidic aqueous solution to produce ethylene glycol, thereby obtaining an exhaust gas having an extremely low ethylene oxide exhaust gas content, and then subjecting the treated exhaust gas to a high-temperature thermal decomposition treatment in an RTO waste treatment apparatus, thereby efficiently and safely purifying the ethylene oxide exhaust gas.
The invention provides a method for treating waste gas containing ethylene oxide, which comprises the following steps: introducing waste gas containing ethylene oxide into an absorption tank to be contacted and absorbed with an absorbent, discharging the absorbed waste gas from the top of the absorption tank, introducing the waste gas into a hydrolysis tank to carry out hydrolysis reaction, discharging the hydrolyzed waste gas from the upper part of the hydrolysis tank, and introducing the hydrolyzed waste gas into an RTO waste gas treatment device; the medium of the hydrolysis tank is acid liquor with the pH value of 1-2.
Of course, it should be noted that the top of the absorption tank is communicated with the hydrolysis tank through a process pipeline, and the upper side of the hydrolysis tank is communicated with the RTO waste gas treatment device through a process pipeline; and introducing the waste gas containing the ethylene oxide into the absorption tank from the bottom of the absorption tank, fully contacting and absorbing with an absorbent in the absorption tank, allowing the absorbed waste gas to enter the hydrolysis tank through a process pipeline at the top of the absorption tank, allowing hydrolysis reaction to occur in the hydrolysis tank, and allowing the hydrolyzed waste gas to enter the RTO waste gas treatment device through a process pipeline on the upper side of the hydrolysis tank.
In certain embodiments of the invention, the ethylene oxide-containing off-gas has an ethylene oxide content of 0.01 to 10% by mass.
In some embodiments of the invention, a microporous aeration head is arranged at the bottom of the hydrolysis tank, and the absorbed waste gas is discharged from the top of the absorption tank and then is introduced into the hydrolysis tank through the microporous aeration head. The process pipeline at the top of the absorption tank is communicated with the microporous aeration head, and the waste gas absorbed by the absorption tank enters the process pipeline at the top of the absorption tank, is scattered by the microporous aeration head communicated with the process pipeline and is sent to the hydrolysis tank. The purpose of this is, ethylene oxide can hydrolyze and produce ethylene glycol under the acid condition, but because ethylene oxide is the gas, will form the large bubble in directly letting into the acidizing fluid, and the hydrolysis reaction only takes place on the surface of bubble, therefore, through setting up said micropore aeration head is used for breaking up the large bubble and forming the tiny bubble, increase reaction efficiency.
In certain embodiments of the invention, the microporous aeration head extends at least 1.5m below the surface of the acid solution. This is because if the depth of the micro-porous aeration head is less than 1.5m, gas-liquid contact may be insufficient, and if the depth of the micro-porous aeration head is more than 2m, although the use effect may not be affected, the construction cost may be high, and therefore, the depth of the micro-porous aeration head extending below the acid liquid surface is preferably 1.5 to 2 m.
In some embodiments of the invention, the hydrolysis tank is further provided with a plurality of filter screens parallel to the bottom of the tank, and the filter screens are arranged above the microporous aeration head. Of course, it should be noted that the number of the filter screens is not limited to three as shown in fig. 1, and the specific number may be specifically selected according to actual situations, and it should be noted that, if two or more filter screens are provided, the interval between the filter screens needs to be ensured to be 30-40 cm. The material of the filter screen is not particularly required, stainless steel 304 or 316 is preferred, and in principle, the mesh number of the filter screen is not less than 1800 meshes, and the lower the pore diameter, the better the implementation effect.
The main purpose of the plurality of screens is to prevent the bubbles from being re-aggregated to form large bubbles (since the reaction occurs only on the surface of the bubbles, the larger the bubbles, the smaller the specific surface area of contact, the lower the efficiency, and the worse the effect), and if the large bubbles are intercepted by the screens and divided into small bubbles in the process of rising, the gas-liquid contact area is increased, and the conversion rate can be effectively improved. In addition, as for the setting of the angles of the filter screens, in the embodiment of the present invention, a plurality of the filter screens are sequentially arranged in parallel to the bottom of the hydrolysis tank at intervals, and in other embodiments of the present invention, a plurality of the filter screens may also be arranged at angles to each other, all of which can achieve the intended effect of the present invention, and the inventor does not limit this.
In some embodiments of the present invention, the absorbent in the absorption tank is ethylene carbonate, the mass ratio of ethylene oxide in the exhaust gas to ethylene carbonate is 0.01-0.8:1, the absorption temperature of the absorption tank is 60-70 ℃, the liquid-gas mass ratio is 1.6-2.0, and the pressure in the tank is 1.2-1.5Mpa, so that 85-98% of ethylene oxide in the exhaust gas can be removed. As for the absorption temperature of the absorption tank, the ethylene oxide solubility is influenced by the fact that the ethylene carbonate temperature is too high (higher than 70 ℃), and the ethylene carbonate solubility is influenced by the fact that the ethylene carbonate temperature is too low (lower than 60 ℃), so that the ethylene carbonate has poor fluidity, the gas-liquid contact is not uniform, and the absorption rate is influenced.
In certain embodiments of the invention, the RTO exhaust gas treatment device comprises a pyrolysis furnace having a furnace temperature of 850-. The pyrolysis furnace can not only purify ethylene oxide in the waste gas, but also treat other residual organic pollutants in the waste gas.
Compared with the prior art, the invention has the following advantages:
1. the waste gas containing the ethylene oxide is sequentially introduced into an absorption tank, a hydrolysis tank and an RTO waste gas treatment device for treatment, wherein the absorption tank is used for high-pressure absorption, in order to remove most of the ethylene oxide in the waste gas, the hydrolysis tank is used for hydrolysis absorption, the characteristic that the ethylene oxide rapidly reacts with water in an acidic aqueous solution to generate glycol is utilized, so that the waste gas with extremely low content of the ethylene oxide waste gas is obtained, and the RTO waste gas treatment device is used for high-temperature thermal decomposition treatment, so that the ethylene oxide waste gas is efficiently and safely purified.
2. The invention is provided with the microporous aeration head to break up the waste gas and then send the waste gas into the acid liquor in the hydrolysis tank, thus avoiding the waste gas from being directly introduced into the acid liquor to generate large bubbles.
3. The hydrolysis tank is internally provided with a plurality of filter screens parallel to the tank bottom, the filter screens are mainly used for preventing the bubbles from being gathered again to form large bubbles, and if the large bubbles are intercepted and divided into small bubbles by the filter screens in the rising process, the gas-liquid contact area is increased, the conversion rate can be effectively improved.
Drawings
FIG. 1 is a schematic view of the process flow of a method for treating an ethylene oxide-containing waste gas according to the present invention.
In the figure: 1. an absorption tank; 2. a hydrolysis tank; 3. a microporous aeration head; 4. filtering with a screen; 5. RTO exhaust treatment device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Introducing waste gas with the ethylene oxide content of 3.12% into an absorption tank 1 containing ethylene carbonate, wherein the liquid-gas mass ratio is 1.8, the pressure in the tank is 1.3Mpa, the absorption temperature is 60 ℃, the waste gas is sufficiently contacted with the ethylene carbonate in the absorption tank, the waste gas is discharged from the top of the absorption tank to the bottom of a hydrolysis tank 2 containing acid liquor with the pH value of 2, and the waste gas is discharged from a microporous aeration head 3, wherein the microporous aeration head 3 is arranged 1.5m below the liquid level of the acid liquor, three filter screens 4 parallel to the tank bottom are further arranged in the hydrolysis tank, the filter screens 4 are arranged above the microporous aeration head 3, the three filter screens 4 are sequentially spaced by 30cm, and the waste gas hydrolyzed in the hydrolysis tank 2 is discharged from the upper part of the hydrolysis tank 2 and then enters an RTO waste gas treatment device 5 with the furnace temperature of 850 ℃.
(see Table 1 for results analysis)
Example 2
Introducing waste gas with 6.25% of ethylene oxide content into an absorption tank 1 containing ethylene carbonate, wherein the liquid-gas mass ratio is 1.8, the pressure in the tank is 1.3Mpa, the absorption temperature is 65 ℃, the waste gas is sufficiently contacted with the ethylene carbonate in the absorption tank 1, the waste gas is discharged from the top of the absorption tank 1 to the bottom of a hydrolysis tank 2 containing acid solution with the pH value of 2, and the waste gas is discharged by a microporous aeration head 3, at the moment, the microporous aeration head 3 is arranged below the liquid level of the acid solution by 1.8m, three filter screens 4 parallel to the bottom of the hydrolysis tank 2 are further arranged in the hydrolysis tank 2, the filter screens 4 are arranged above the microporous aeration head 3, the three filter screens 4 are sequentially spaced by 35cm, and the waste gas hydrolyzed by the hydrolysis tank 2 is discharged from the upper part of the hydrolysis tank 2 and then enters an RTO waste gas treatment device 5 with the furnace temperature of 850 ℃. (see Table 1 for results analysis)
Example 3
Introducing waste gas with 8.72 percent of ethylene oxide content into an absorption tank 1 containing ethylene carbonate, wherein the liquid-gas mass ratio is 1.8, the pressure in the tank is 1.3Mpa, the absorption temperature is 70 ℃, the waste gas is sufficiently contacted with the ethylene carbonate in the absorption tank 1, the waste gas is discharged from the top of the absorption tank 1 to the bottom of a hydrolysis tank 2 containing acid solution with the pH value of 2, and the waste gas is discharged by a microporous aeration head 3, at the moment, the microporous aeration head 3 is arranged 2.0m below the liquid level of the acid solution, three filter screens 4 parallel to the bottom of the hydrolysis tank 2 are further arranged in the hydrolysis tank 2, the filter screens 4 are arranged above the microporous aeration head 3, the three filter screens 4 are sequentially spaced by 40cm, and the waste gas hydrolyzed by the hydrolysis tank 2 is discharged from the upper part of the hydrolysis tank 2 and then enters an RTO waste gas treatment device 5 with the furnace temperature of 850 ℃. (analysis of results is shown in Table 1)
Comparative example 1
Introducing waste gas with the ethylene oxide content of 3.12% into an absorption tank 1 containing ethylene carbonate, wherein the liquid-gas mass ratio is 1.8, the pressure in the tank is 1.3Mpa, the absorption temperature is 60 ℃, the waste gas is sufficiently contacted with the ethylene carbonate in the absorption tank 1, the waste gas is discharged from the top of the absorption tank 1 to the bottom of a hydrolysis tank 2 containing acid solution with the pH value of 2, and the waste gas is discharged by a microporous aeration head 3, wherein the microporous aeration head 3 is arranged below the liquid level of the acid solution by 1.0m, three filter screens 4 parallel to the bottom of the hydrolysis tank 2 are further arranged in the hydrolysis tank 2, the filter screens 4 are arranged above the microporous aeration head 3, the three filter screens 4 are sequentially spaced by 30cm, and the waste gas hydrolyzed by the hydrolysis tank 2 is discharged from the upper part of the hydrolysis tank 2 and then enters an RTO waste gas treatment device 5 with the furnace temperature of 850 ℃. (see Table 1 for results analysis)
Comparative example 2
Introducing waste gas with the ethylene oxide content of 3.12% into an absorption tank 1 containing ethylene carbonate, wherein the liquid-gas mass ratio is 1.8, the pressure in the tank is 1.3Mpa, the absorption temperature is 60 ℃, the waste gas is discharged from the top of the absorption tank 1 to the bottom of a hydrolysis tank 2 containing acid solution with the pH value of 2 after being sufficiently contacted with the ethylene carbonate in the absorption tank 1 and is discharged by a microporous aeration head 3, at the moment, the microporous aeration head 3 is arranged 1.5m below the liquid level of the acid solution, a filter screen 4 is not arranged in the hydrolysis tank 2, and the waste gas hydrolyzed by the hydrolysis tank 2 is discharged from the upper part of the hydrolysis tank 2 and then enters an RTO waste gas treatment device 5 with the furnace temperature of 850 ℃. (see Table 1 for results analysis)
TABLE 1
The results were analyzed in conjunction with Table 1.
According to the method for treating the waste gas containing the ethylene oxide, the waste gas containing the ethylene oxide is sequentially introduced into an absorption tank 1 containing the ethylene carbonate, a hydrolysis tank 2 containing acid liquid and an RTO waste gas treatment device 5 for high-temperature combustion, the absorption temperature of the absorption tank 1 is 60-70 ℃, the liquid-gas mass ratio is 1.6-2.0, and the pressure in the tank is 1.2-1.5MPa, so that 85-98% of the ethylene oxide in the waste gas can be removed, specifically, as shown in examples 1-3, the ethylene oxide content of the waste gas containing the ethylene oxide of 3.12% after being absorbed by the absorption tank is 570ppm, the ethylene oxide content of the waste gas containing the ethylene oxide of 6.25% after being absorbed by the absorption tank is 1092ppm, and the ethylene oxide content of the waste gas containing the ethylene oxide of 8.27% after being absorbed by the absorption tank is 1.02%; the hydrolysis pool 2 containing the acid liquor utilizes the characteristic that ethylene oxide rapidly reacts with water in an acidic aqueous solution to generate ethylene glycol, so that the waste gas with extremely low content of ethylene oxide waste gas is obtained.
Moreover, the bottom 1.5 meters department of hydrolysis tank described in this application is provided with a plurality of micropore aeration heads 3, the purpose of micropore aeration head 3 is in sending into the acidizing fluid of hydrolysis tank 2 after breaking up waste gas, can avoid waste gas direct to let in the acidizing fluid and produce big bubble so doing, because ethylene oxide hydrolysis under the acid condition can only take place on the surface of bubble, consequently will big bubble break up into the microbubble and can accelerate reaction efficiency.
Meanwhile, three filter screens 4 parallel to the bottom of the hydrolysis tank 2 are further arranged in the hydrolysis tank 2, the three filter screens 4 are sequentially arranged at intervals of 30m, the three filter screens 4 are all arranged above the microporous aeration head 3, and after the microporous aeration head 3 and the filter screens 4 are arranged in the hydrolysis tank 2, ethylene oxide in waste gas absorbed by the absorption tank can be effectively reduced; as shown in examples 1 to 3, 570ppm of ethylene oxide remaining after absorption in the absorption tank was hydrolyzed in the hydrolysis tank to obtain 6ppm of ethylene oxide, 1092ppm of ethylene oxide remaining after absorption in the absorption tank was hydrolyzed in the hydrolysis tank to obtain 13ppm of ethylene oxide, and 1.02% of ethylene oxide remaining after absorption in the absorption tank was hydrolyzed in the hydrolysis tank to obtain 106ppm of ethylene oxide.
Moreover, the present application also provides comparative example 1 and comparative example 2, wherein comparative example 1 relates to the arrangement of a plurality of micro-porous aeration heads at 1.0m from the bottom of the hydrolysis tank, and the treatment effect is that 580ppm of ethylene oxide left after absorption by the absorption tank is hydrolyzed by 18ppm of ethylene oxide left after the micro-porous aeration heads are arranged at 1.0m from the bottom of the hydrolysis tank, and thus the treatment effect of comparative example 1 is inferior to that of example 1 in which micro-porous aeration heads are arranged at 1.5m from the bottom of the hydrolysis tank, because the micro-porous aeration heads arranged at a depth of less than 1.5m may cause insufficient gas-liquid contact, and thus the treatment effect is not good. Comparative example 2, which relates to the case where the filter net is not provided in the hydrolysis tank, has a processing effect that 576ppm of ethylene oxide remaining after absorption by the absorption tank is hydrolyzed by the hydrolysis tank where the filter net is not provided, and the processing effect of comparative example 2 is far inferior to the processing effect of the case where the filter net is provided in the hydrolysis tank of example 1, because the filter net can effectively prevent the small bubbles processed by the micro-porous aeration head from being re-aggregated to form large bubbles, thereby increasing the gas-liquid contact area and effectively improving the conversion rate, it can be seen that the necessity of using the micro-porous aeration head and the filter net in cooperation with each other in the hydrolysis tank.
And finally, introducing the waste gas hydrolyzed by the hydrolysis tank into the RTO waste gas treatment device for purification, wherein the content of ethylene oxide after purification is less than 2ppm, and the ethylene oxide gas emptying standard (less than 2ppm) in the comprehensive emission standard GB16297-1996 of atmospheric pollutants is met.
The present invention has been further described with reference to specific embodiments, but it should be understood that the detailed description should not be construed as limiting the spirit and scope of the present invention, and various modifications made to the above-described embodiments by those of ordinary skill in the art after reading this specification are within the scope of the present invention.
Claims (10)
1. A method for treating waste gas containing ethylene oxide is characterized by comprising the following steps: introducing waste gas containing ethylene oxide into an absorption tank to be contacted and absorbed with an absorbent, discharging the absorbed waste gas from the top of the absorption tank, introducing the waste gas into a hydrolysis tank to perform hydrolysis reaction, discharging the hydrolyzed waste gas from the upper part of the hydrolysis tank, and introducing the hydrolyzed waste gas into an RTO waste gas treatment device; the medium of the hydrolysis tank is acid liquor.
2. The method for treating an ethylene oxide-containing exhaust gas according to claim 1, characterized in that: the mass content of the ethylene oxide in the waste gas containing the ethylene oxide is 0.01-10%.
3. The method for treating an ethylene oxide-containing exhaust gas according to claim 1, characterized in that: and a micropore aeration head is arranged at the bottom of the hydrolysis tank, and the absorbed waste gas is discharged from the top of the absorption tank and then enters the hydrolysis tank through the micropore aeration head.
4. The method for treating an ethylene oxide-containing exhaust gas according to claim 3, wherein: the microporous aeration head extends to at least 1.5m below the liquid level of the acid liquor.
5. The method for treating an ethylene oxide-containing exhaust gas according to claim 3 or 4, wherein: the inside of the hydrolysis tank is also provided with a plurality of filter screens parallel to the bottom of the tank, and the filter screens are arranged above the microporous aeration heads.
6. The method for treating an ethylene oxide-containing exhaust gas according to claim 5, characterized in that: the filter screens are sequentially arranged at intervals of 30-40 cm.
7. The method for treating an ethylene oxide-containing exhaust gas according to claim 1, characterized in that: the absorbent in the absorption tank is ethylene carbonate.
8. The method for treating an ethylene oxide-containing exhaust gas according to claim 7, characterized in that: the mass ratio of the ethylene oxide in the waste gas to the ethylene carbonate is 0.01-0.8: 1.
9. The method for treating an ethylene oxide-containing exhaust gas according to claim 1, characterized in that: the absorption temperature of the absorption tank is 60-70 ℃, the liquid-gas mass ratio is 1.6-2.0, and the pressure in the tank is 1.2-1.5 Mpa.
10. The method for treating an ethylene oxide-containing exhaust gas according to claim 1, characterized in that: the RTO waste gas treatment device comprises a pyrolysis furnace, and the furnace temperature of the pyrolysis furnace is 850-1000 ℃.
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