CN116173713A - Treatment method for tail gas generated in methylamine and NMP production - Google Patents
Treatment method for tail gas generated in methylamine and NMP production Download PDFInfo
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- CN116173713A CN116173713A CN202310273847.6A CN202310273847A CN116173713A CN 116173713 A CN116173713 A CN 116173713A CN 202310273847 A CN202310273847 A CN 202310273847A CN 116173713 A CN116173713 A CN 116173713A
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- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 239000002253 acid Substances 0.000 claims abstract description 120
- 239000007788 liquid Substances 0.000 claims abstract description 112
- 238000010521 absorption reaction Methods 0.000 claims abstract description 108
- 239000007921 spray Substances 0.000 claims abstract description 94
- 239000002351 wastewater Substances 0.000 claims abstract description 83
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims abstract description 22
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 16
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 11
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 61
- 238000011084 recovery Methods 0.000 claims description 51
- 238000012856 packing Methods 0.000 claims description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 230000001174 ascending effect Effects 0.000 claims description 12
- 239000010865 sewage Substances 0.000 claims description 11
- 238000012546 transfer Methods 0.000 claims description 11
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 229910021529 ammonia Inorganic materials 0.000 abstract description 4
- 239000012535 impurity Substances 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 16
- 239000000463 material Substances 0.000 description 7
- 238000003912 environmental pollution Methods 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
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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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
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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
- B01D53/38—Removing components of undefined structure
- B01D53/42—Basic components
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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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
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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
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Abstract
The invention relates to the technical field of tail gas treatment in the production process of methylamine and NMP, in particular to a tail gas treatment method for the production of methylamine and NMP; the acid spray absorption tower, the recovered wastewater spray absorption tower and the gas-liquid separation tower are adopted for compound treatment, so that the processes of acid washing neutralization, alkaline substance removal and absorption, filtering adsorption and the like can be sequentially carried out on the tail gas containing methylamine, tetrahydrofuran and unreacted complete butanol, the removal and absorption effects of the alkaline substances of the tail gas can be remarkably improved, water-soluble impurities, moisture and trace pollution factors in the tail gas are effectively removed, the conditions of large peculiar smell of a discharge port and heavy ammonia smell in a working area are avoided, the tail gas treatment effect is remarkable, meanwhile, the treatment process is simple, the equipment investment is less, and the maintenance cost is low; in addition, the invention can greatly reduce the production cost by adopting the recycled wastewater.
Description
Technical Field
The invention relates to the technical field of tail gas treatment in the production process of methylamine and NMP, in particular to a tail gas treatment method for the production of methylamine and NMP.
Background
The prior methylamine and NMP (N-methyl pyrrolidone) can generate methylamine tail gas in the production process, the prior methylamine tail gas is treated by adopting a water absorption spray tower, a mechanical demister, UV photoelectricity and active carbon treatment process in sequence, but spray water is supplemented at one time and discharged intermittently in the treatment process of the water absorption spray tower, so that the process is complex, the power consumption is high, the labor intensity is high and the treatment cost is high, and alkaline substances and water-soluble impurities in the tail gas cannot be continuously and thoroughly removed in the intermittent supplementing and discharging mode of absorption liquid, so that the tail gas treatment effect is poor.
In view of the problems of heavy absorption load of a spray tower, incomplete absorption of methylamine and tetrahydrofuran, large peculiar smell of a discharge port, heavy ammonia smell of a working area and exceeding of pollution factors in tail gas emission in the tail gas treatment process in the prior art, the invention provides a treatment method for producing the tail gas by using the methylamine and NMP.
Disclosure of Invention
In view of the above, it is desirable to provide a method for treating tail gas from methylamine and NMP production.
A method for treating tail gas generated in the production of methylamine and NMP comprises the following steps:
introducing tail gas containing methylamine, tetrahydrofuran and unreacted complete butanol into an acid spray tower, sequentially carrying out mass transfer, exchange and acid-base neutralization reaction on the tail gas in the ascending process through a lower tray random packing, a lower acid liquid sprayer, an upper tray structured packing and an upper acid liquid sprayer, and then removing water through a cyclone separator at the top of the acid spray tower to obtain neutralized tail gas;
introducing the neutralized tail gas into a first-stage recovery waste water spray absorption tower, and sequentially carrying out primary removal and absorption on tetrahydrofuran and unreacted complete butanol in the tail gas through a lower tray random packing, a lower liquid distributor, an upper tray structured packing and an upper liquid distributor in the ascending process of the tail gas, and then removing water through a cyclone separator at the top of the first-stage recovery waste water spray absorption tower to obtain the tail gas subjected to first-stage removal and absorption;
introducing the tail gas subjected to primary removal and absorption into a secondary recovery waste water spray absorption tower, sequentially carrying out secondary removal, absorption, washing and mass transfer on the tail gas in the ascending process through a lower tray random packing, a lower liquid distributor, an upper tray structured packing and an upper liquid distributor, and then removing water through a cyclone separator at the top of the secondary recovery waste water spray absorption tower to obtain the tail gas subjected to secondary removal and absorption;
introducing the tail gas subjected to secondary removal and absorption into a gas-liquid separation tower, filtering and adsorbing the tail gas in the rising process by using a plurality of layers of activated carbon beds, and then removing water by using a cyclone separator at the top of the gas-liquid separation tower to obtain the treated clean tail gas;
clean tail gas is introduced into a chimney through a fan and then discharged into the atmosphere through the chimney.
Preferably, the acid liquor is conveyed into an acid liquor recovery tank at the bottom of the acid spray tower after being metered, then conveyed into a lower acid liquor sprayer and an upper acid liquor sprayer through a conveying pipeline by a circulating pump in the acid liquor recovery tank, the acid liquor is sprayed by utilizing a spray header below the lower acid liquor sprayer and the upper acid liquor sprayer, the acid liquor falls back into the acid liquor recovery tank at the bottom of the acid spray tower, the acid liquor is conveyed into the lower acid liquor sprayer and the upper acid liquor sprayer again through the circulating pump to form primary circulation of the acid liquor, the fallen acid liquor is conveyed into a collecting tank outside the acid spray tower by the circulating pump through a pH sensor arranged in the acid liquor recovery tank to monitor the pH value of the acid liquor in real time, and if the actual pH value of the acid liquor is larger than the preset pH value of the acid liquor, the acid liquor is conveyed into the collecting tank outside the acid spray tower by the circulating pump according to metering, the pH value of the acid liquor in the collecting tank is regulated, and then the acid liquor is conveyed into the lower acid liquor sprayer and the upper acid liquor sprayer through the circulating pump in the collecting tank again to form secondary circulation of the acid liquor.
Preferably, the recovered waste water is waste water recovered from a sewage station, the waste water recovered from the sewage station is conveyed to a lower liquid distributor and an upper liquid distributor in a second-stage recovered waste water spray absorption tower after being metered, the absorption liquid is sprayed by utilizing a spray header below the lower liquid distributor and the upper liquid distributor, the absorption liquid falls back to a circulating water tank at the bottom of the second-stage recovered waste water spray absorption tower, the absorption liquid in the circulating water tank is conveyed into the lower liquid distributor and the upper liquid distributor in the first-stage recovered waste water spray absorption tower through a circulating water pump arranged outside the second-stage recovered waste water spray absorption tower, the absorption liquid is sprayed by utilizing a spray header below the lower liquid distributor and the upper liquid distributor, the absorption liquid falls back to the circulating water tank at the bottom of the first-stage recovered waste water spray absorption tower, the absorption liquid in the circulating water tank is pumped back to a biochemical pond of the sewage station through a metering pump arranged outside the first-stage recovered waste water spray absorption tower for treatment, and the treated waste water recovered from the sewage station is conveyed into the lower liquid distributor and the upper liquid distributor in the second-stage recovered waste water spray absorption tower again, so that the absorption liquid is recycled.
Preferably, a chilled water coil pipe for reducing the temperature of the absorption liquid is arranged in the circulating water tank at the bottom of the secondary recovery wastewater spray absorption tower and the circulating water tank at the bottom of the primary recovery wastewater spray absorption tower, and a cold water inlet of the chilled water coil pipe respectively penetrate through the tower body.
Preferably, the number of layers of the activated carbon bed is two, namely an upper layer and a lower layer, tail gas is filtered and adsorbed by the upper layer and the lower layer of activated carbon, then water is removed by a cyclone separator, and separated liquid is pumped into a biochemical pool of a sewage station through a tower bottom pump in a gas-liquid separation tower for treatment.
The invention has the advantages that: according to the method for treating the tail gas in the production of the methylamine and the NMP, provided by the invention, the processes of acid washing neutralization, alkaline substance removal and absorption, filtering adsorption and the like can be sequentially carried out on the tail gas containing the methylamine, the tetrahydrofuran and the unreacted complete butanol by adopting the acid spray absorption tower, the recovered wastewater spray absorption tower and the gas-liquid separation tower composite treatment process, so that the removal and absorption effects of the alkaline substance of the tail gas can be obviously improved, water-soluble impurities, moisture and trace pollution factors in the tail gas are effectively removed, the conditions of large peculiar smell at a discharge port and heavy ammonia taste in a working area are avoided, the tail gas treatment effect is obvious, meanwhile, the treatment process flow is simple, the equipment investment is less, and the maintenance cost is low; in addition, the invention can greatly reduce the production cost by adopting the recycled wastewater.
Drawings
FIG. 1 is a flow chart of a method for treating tail gas from methylamine and NMP production in an embodiment of the invention;
FIG. 2 is a schematic diagram of a tail gas treatment system for methylamine and NMP production in accordance with the invention.
Reference numerals: the device comprises an inlet A, a cyclone separator B, an activated carbon bed C, an upper tray structured packing D, a circulating pump E, a lower tray random packing F, a circulating water pump G, a fan H, a chimney I, an upper acid liquid sprayer J, a lower acid liquid sprayer K, an upper liquid distributor L, a lower liquid distributor M, a metering pump N, an acid spray tower T-101, a primary recovery waste water spray absorption tower T-102, a secondary recovery waste water spray absorption tower T-103 and a gas-liquid separation tower T-104.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail by the following detailed description with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a method for treating tail gas generated by methylamine and NMP, which is realized based on a methylamine and NMP production tail gas treatment system, as shown in figure 2, the methylamine and NMP production tail gas treatment system comprises an acid spray tower T-101, a primary recovery waste water spray absorption tower T-102, a secondary recovery waste water spray absorption tower T-103, a gas-liquid separation tower T-104, a fan H and a chimney I, which are sequentially communicated, wherein a cyclone separator B, an upper acid liquid sprayer J, an upper tray structured packing D, a lower acid liquid sprayer K, a lower tray random packing F and an acid liquid recovery tank are sequentially arranged in the acid spray tower T-101 from top to bottom, a pH sensor for monitoring the pH value of the acid liquid in real time and a circulating pump E for pumping the acid liquid are arranged in the acid liquid recovery tank, and a collecting tank for adjusting the pH value of the acid liquid is arranged outside the acid spray tower T-101; a cyclone separator B, an upper liquid distributor L, an upper tray structured packing D, a lower liquid distributor M, a lower tray random packing F and a circulating water tank are sequentially arranged in the first-stage recovery waste water spray absorption tower T-102 from top to bottom, and a chilled water coil pipe for reducing the temperature of absorption liquid is arranged in the circulating water tank; a cyclone separator B, an upper liquid distributor L, an upper tray structured packing D, a lower liquid distributor M, a lower tray random packing F and a circulating water tank are sequentially arranged in the secondary recovery wastewater spray absorption tower T-103 from top to bottom, and a chilled water coil pipe for reducing the temperature of absorption liquid is arranged in the circulating water tank; a circulating water pump G for conveying the recovered wastewater is arranged between the first-stage recovered wastewater spray absorption tower T-102 and the second-stage recovered wastewater spray absorption tower T-103; the cyclone separator B, the upper layer of active carbon, the lower layer of active carbon and a tower bottom water tank are sequentially arranged in the gas-liquid separation tower T-104 from top to bottom, and a tower bottom pump is arranged in the tower bottom water tank.
In this embodiment, the random packing material according to the present invention may be made of one of plastic material, metal material, tetrafluoro material and ceramic material, and the random packing material may include, but is not limited to, ring packing, saddle packing, ring saddle packing, spherical packing, etc., and may be selected according to actual production needs, and is not limited herein, and functions of the random packing material are: the pressure drop of the tower tray can be reduced, the gas flow mass transfer is facilitated, the later cleaning and replacement of the filler can be facilitated, and the use is convenient.
In this embodiment, the structured packing according to the present invention may be made of one of a metal material, a plastic material, a ceramic material and a carbon fiber material, and may be selected according to actual production needs, which is not limited herein, and functions as follows: can provide a large amount of surface area and channels for acid liquor or absorption liquid, provide places for treating tail gas by the acid liquor or the absorption liquid, and increase the contact opportunity and reaction rate of the acid liquor or the absorption liquid.
In this embodiment, the acid solution according to the present invention may include, but is not limited to, dilute sulfuric acid, dilute hydrochloric acid, etc., and the concentration of the acid solution may be selected according to the PH value of the actual alkaline tail gas.
In the embodiment, the recovery wastewater related to the invention is the wastewater recovered from the sewage station, and the recovery wastewater is adopted, so that the production cost can be greatly reduced.
Based on the methylamine and NMP production tail gas treatment system, the invention provides a methylamine and NMP production tail gas treatment method, which comprises the following steps:
step S101, acid washing and neutralizing tail gas, namely introducing the tail gas containing methylamine, tetrahydrofuran and unreacted complete butanol into an acid spray tower T-101, sequentially carrying out mass transfer, exchange and acid-base neutralization reaction on the tail gas in the ascending process through a lower tray random packing F, a lower acid liquid sprayer K, an upper tray regular packing D and an upper acid liquid sprayer J, and then removing water through a cyclone separator B on the top of the acid spray tower T-101 to obtain neutralized tail gas.
Wherein the alkaline substances contained in the tail gas can be neutralized to the greatest extent possible in the acid spray tower T-101.
Specifically, the tail gas firstly enters the acid spray tower T-101 through an inlet A of the acid spray tower T-101, and mass transfer, exchange and acid-base neutralization reactions are sequentially carried out through a lower tray random packing F and an upper tray regular packing D in the ascending process, so that most alkaline substances and impurities are taken out, and then water is removed through a cyclone separator B at the top of the tower, so that entrainment is reduced, and environmental pollution is reduced.
In the process, the acid liquor is conveyed into an acid liquor recovery tank at the bottom of the acid spray tower T-101 after being metered, then conveyed into a lower acid liquor sprayer K and an upper acid liquor sprayer J through a conveying pipeline by a circulating pump E in the acid liquor recovery tank, the acid liquor is sprayed by utilizing a spray header below the lower acid liquor sprayer K and the upper acid liquor sprayer J, the acid liquor falls back into the acid liquor recovery tank at the bottom of the acid spray tower T-101, the acid liquor is conveyed into the lower acid liquor sprayer K and the upper acid liquor sprayer J again through the circulating pump E to form primary circulation of the acid liquor, the pH value of the fallen acid liquor is monitored in real time by a pH sensor arranged in the acid liquor recovery tank, if the actual pH value of the acid liquor is larger than the preset pH value of the acid liquor, the circulating pump E is utilized to convey the acid liquor to a collecting tank outside the acid spray tower T-101, the pH value of the acid liquor in the collecting tank is metered, the acid liquor in the collecting tank is regulated, and then the acid liquor is conveyed into the lower acid liquor sprayer K and the upper acid liquor sprayer J through the circulating pump E in the collecting tank again to form secondary circulation.
Step S102, primarily removing, absorbing and washing tail gas, introducing the neutralized tail gas into a primary recovery waste water spray absorption tower T-102, primarily removing and absorbing tetrahydrofuran and unreacted complete butanol in the tail gas in sequence through a lower tray random packing F, a lower liquid distributor M, an upper tray structured packing D and an upper liquid distributor L in the ascending process of the tail gas, and then removing water through a cyclone separator B at the top of the primary recovery waste water spray absorption tower T-102 to obtain the tail gas subjected to primary removal and absorption.
The first-stage recovery waste water spray absorption tower T-102 can be used for removing tetrahydrofuran and unreacted complete butanol in tail gas, and the recovery waste water adopts a continuous supplementing and discharging mode, so that the recovery waste water is in reverse contact and mass transfer with the tail gas through spraying in the tail gas rising process, and the absorption effect of the recovery waste water can be effectively improved; in addition, a circulating water tank is arranged at the bottom of the first-stage recovery waste water spray absorption tower T-102, and a chilled water coil is arranged in the circulating water tank, so that the temperature of the absorption liquid can be reduced, and the absorption degree of alkaline substances in tail gas can be enhanced.
Specifically, the tail gas at the top of the acid spray tower T-101 enters the bottom of the first-stage recovery waste water spray absorption tower T-102 through a conveying pipeline, and in the ascending process, mass transfer and washing are sequentially carried out through a lower tray random packing F and an upper tray regular packing D, and then water is removed through a cyclone separator B, so that entrainment is reduced, and environmental pollution is reduced.
In the process, the recovered wastewater is wastewater recovered in a wastewater station, the wastewater recovered in the wastewater station is conveyed to a lower liquid distributor M and an upper liquid distributor L in a secondary recovered wastewater spray absorption tower T-103 after being metered, absorption liquid is sprayed by utilizing a spray header below the lower liquid distributor M and the upper liquid distributor L, the absorption liquid falls back to a circulating water tank at the bottom of the secondary recovered wastewater spray absorption tower T-103, the absorption liquid in the circulating water tank is conveyed into a lower liquid distributor M and an upper liquid distributor L in the primary recovered wastewater spray absorption tower T-102 through a circulating water pump G distributed outside the secondary recovered wastewater spray absorption tower T-103, absorption liquid is sprayed by utilizing a spray header below the lower liquid distributor M and the upper liquid distributor L, the absorption liquid in the circulating water tank is conveyed back to a biochemical pond of the wastewater station for treatment through N distributed outside the secondary recovered wastewater spray absorption tower T-102, and the treated absorption liquid is conveyed into the upper liquid distributor L of the secondary recovered wastewater spray absorption tower T-102 again to form the wastewater in the primary recovered wastewater spray absorption tower T-102.
And step S103, secondary removal, absorption and washing of tail gas, wherein the tail gas subjected to the primary removal and absorption is introduced into a secondary recovery waste water spray absorption tower T-103, and the tail gas sequentially passes through a lower tray random packing F, a lower liquid distributor M, an upper tray structured packing D and an upper liquid distributor L in the ascending process to carry out secondary removal, absorption, washing and mass transfer, and then moisture is removed through a cyclone separator B at the top of the secondary recovery waste water spray absorption tower T-103, so that the tail gas subjected to the secondary removal and absorption is obtained.
Specifically, the tail gas at the top of the first-stage recovery waste water spray absorption tower T-102 enters the bottom of the second-stage recovery waste water spray absorption tower T-103 through a conveying pipeline, and in the ascending process, mass transfer and washing are sequentially carried out through a lower tray random packing F and an upper tray regular packing D, and then water is removed through a cyclone separator B, so that entrainment is reduced, and environmental pollution is reduced.
In the process, the tail gas is absorbed by the first-stage recovery waste water spray absorption tower T-102 and the second-stage recovery waste water spray absorption tower T-103, and the tail gas and the washing liquid (recovery waste water) are reversely absorbed and transferred, so that the cleanliness of the discharged tail gas can be ensured, and the circulating waste water can be continuously and stably recovered and recycled.
In the process, a chilled water coil pipe for reducing the temperature of the absorption liquid is also arranged in a circulating water tank at the bottom of the secondary recovery wastewater spray absorption tower T-103, and a cold water inlet of the chilled water coil pipe respectively penetrate through the tower body.
And step S104, filtering and adsorbing the tail gas, introducing the tail gas subjected to secondary removal and absorption into a gas-liquid separation tower T-104, filtering and adsorbing the tail gas in the rising process by a multi-layer activated carbon bed C, and then removing water by a cyclone separator B at the top of the gas-liquid separation tower T-104 to obtain the treated clean tail gas.
The tail gas passing through the top of the secondary recovery waste water spray absorption tower T-103 enters the bottom of the gas-liquid separation tower T-104, and the upper and lower layers of active carbon absorption particles are distributed in the gas-liquid separation tower T-104 and are used for removing trace ammonia and tetrahydrofuran in the tail gas, so that the external emission of pollution factors can be reduced, and the environmental pollution is further reduced.
In the process, the number of layers of the activated carbon bed C is two, namely an upper layer and a lower layer, tail gas is filtered and adsorbed by the upper layer and the lower layer of activated carbon, then water is removed by the cyclone separator B, and the separated liquid is pumped into a biochemical pool of a sewage station for treatment by a tower bottom pump in the gas-liquid separation tower T-104.
Meanwhile, the upper active carbon bed and the lower active carbon bed can also play a role in separating gas from liquid in the tail gas so as to separate liquid in the tail gas.
In step S105, clean tail gas is introduced into the chimney I through the fan H, and is discharged into the atmosphere through the chimney I.
It will be apparent to those skilled in the art that the various step embodiments of the invention described above may be performed in ways other than those described herein, including but not limited to simulation methods and experimental apparatus described above. The steps of the invention described above may in some cases be performed in a different order than that shown or described above, they may be performed separately or. Therefore, the present invention is not limited to any specific combination of hardware and software.
The foregoing is a further detailed description of the invention in connection with specific embodiments, and is not intended to limit the practice of the invention to such descriptions. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (5)
1. A method for treating tail gas generated in the production of methylamine and NMP is characterized by comprising the following steps:
introducing tail gas containing methylamine, tetrahydrofuran and unreacted complete butanol into an acid spray tower, sequentially carrying out mass transfer, exchange and acid-base neutralization reaction on the tail gas in the ascending process through a lower tray random packing, a lower acid liquid sprayer, an upper tray structured packing and an upper acid liquid sprayer, and then removing water through a cyclone separator at the top of the acid spray tower to obtain neutralized tail gas;
introducing the neutralized tail gas into a first-stage recovery waste water spray absorption tower, and sequentially carrying out primary removal and absorption on tetrahydrofuran and unreacted complete butanol in the tail gas through a lower tray random packing, a lower liquid distributor, an upper tray structured packing and an upper liquid distributor in the ascending process of the tail gas, and then removing water through a cyclone separator at the top of the first-stage recovery waste water spray absorption tower to obtain the tail gas subjected to first-stage removal and absorption;
introducing the tail gas subjected to primary removal and absorption into a secondary recovery waste water spray absorption tower, sequentially carrying out secondary removal, absorption, washing and mass transfer on the tail gas in the ascending process through a lower tray random packing, a lower liquid distributor, an upper tray structured packing and an upper liquid distributor, and then removing water through a cyclone separator at the top of the secondary recovery waste water spray absorption tower to obtain the tail gas subjected to secondary removal and absorption;
introducing the tail gas subjected to secondary removal and absorption into a gas-liquid separation tower, filtering and adsorbing the tail gas in the rising process by using a plurality of layers of activated carbon beds, and then removing water by using a cyclone separator at the top of the gas-liquid separation tower to obtain the treated clean tail gas;
clean tail gas is introduced into a chimney through a fan and then discharged into the atmosphere through the chimney.
2. The method for treating tail gas generated in the production of methylamine and NMP according to claim 1, wherein the acid liquor is metered and then conveyed into an acid liquor recovery tank at the bottom of an acid spray tower, then conveyed into a lower acid liquor sprayer and an upper acid liquor sprayer through a conveying pipeline by a circulating pump in the acid liquor recovery tank, the acid liquor is sprayed by utilizing a spray header below the lower acid liquor sprayer and the upper acid liquor sprayer, the acid liquor falls back into the acid liquor recovery tank at the bottom of the acid spray tower, the acid liquor is conveyed into the lower acid liquor sprayer and the upper acid liquor sprayer again through the circulating pump to form a primary circulation of the acid liquor, the pH value of the acid liquor is monitored in real time by a pH sensor arranged in the acid liquor recovery tank, if the actual pH value of the acid liquor is larger than the preset pH value of the acid liquor, the part of the acid liquor is conveyed into a collecting tank outside the acid spray tower by the circulating pump again, the pH value of the acid liquor in the collecting tank is metered and then conveyed into the lower acid liquor sprayer and the upper acid liquor sprayer through the circulating pump in the collecting tank again to form a secondary circulation.
3. The method for treating tail gas in methylamine and NMP production as claimed in claim 1, wherein the recovered waste water is waste water recovered from a sewage station, the waste water recovered from the sewage station is conveyed to a lower liquid distributor and an upper liquid distributor in a secondary recovered waste water spray absorber after being metered, the absorption liquid is sprayed by a spray header below the lower liquid distributor and the upper liquid distributor, the absorption liquid falls back to a circulating water tank at the bottom of the secondary recovered waste water spray absorber, the absorption liquid in the circulating water tank is conveyed into the lower liquid distributor and the upper liquid distributor in the primary recovered waste water spray absorber through a circulating water pump arranged outside the secondary recovered waste water spray absorber, the absorption liquid is sprayed by a spray header below the lower liquid distributor and the upper liquid distributor, the absorption liquid in the circulating water tank is conveyed back to the circulating water tank at the bottom of the primary recovered waste water spray absorber through a metering pump arranged outside the primary recovered waste water absorber to the sewage station for treatment, and the treated waste water is conveyed again to the lower liquid distributor and the upper liquid distributor in the secondary recovered waste water spray absorber for forming the waste water.
4. The method for treating tail gas from methylamine and NMP production as claimed in claim 3, wherein the circulating water tank at the bottom of the secondary recovery waste water spray absorption tower and the circulating water tank at the bottom of the primary recovery waste water spray absorption tower are respectively provided with a chilled water coil pipe for reducing the temperature of the absorption liquid, and a cold water inlet of the chilled water coil pipe are respectively distributed through the tower body.
5. The method for treating tail gas generated by methylamine and NMP as claimed in claim 1, wherein the number of the active carbon beds is two, the tail gas is filtered and adsorbed by the active carbon of the upper layer and the active carbon of the lower layer, then the water is removed by a cyclone separator, and the separated liquid is pumped into a biochemical pool of a sewage station for treatment by a tower bottom pump in a gas-liquid separation tower.
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