CN114588750A - Treatment method for tail gas in polyimide film production - Google Patents
Treatment method for tail gas in polyimide film production Download PDFInfo
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- CN114588750A CN114588750A CN202210173297.6A CN202210173297A CN114588750A CN 114588750 A CN114588750 A CN 114588750A CN 202210173297 A CN202210173297 A CN 202210173297A CN 114588750 A CN114588750 A CN 114588750A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229920001721 polyimide Polymers 0.000 title abstract description 10
- 238000010521 absorption reaction Methods 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000001914 filtration Methods 0.000 claims abstract description 28
- 239000007921 spray Substances 0.000 claims abstract description 20
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000004064 recycling Methods 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 16
- 238000000746 purification Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000010354 integration Effects 0.000 abstract description 2
- 239000003507 refrigerant Substances 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 139
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 38
- 239000003570 air Substances 0.000 description 31
- AWJUIBRHMBBTKR-UHFFFAOYSA-N isoquinoline Chemical compound C1=NC=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-N 0.000 description 21
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 17
- 239000000428 dust Substances 0.000 description 10
- 239000004642 Polyimide Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000002085 irritant Substances 0.000 description 1
- 231100000021 irritant Toxicity 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000012855 volatile organic compound Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention provides a polyimide film production tail gas treatment method, which relates to the field of tail gas treatment, wherein a production device comprises an air blower, a heat exchange device, an absorption tower, a circulating spray pump, a cooler, a defoaming device and a filtering and purifying device, the method mainly comprises the steps of conveying workshop production exhaust gas to a gas-gas heat exchanger through the air blower, conveying the tail gas into the absorption tower for low-temperature water absorption after heat exchange, performing heat exchange on the treated standard-reaching tail gas serving as a refrigerant and the workshop exhaust gas, discharging a small part of gas after the heat exchange, and returning the rest of gas to the workshop for recycling after filtering and purifying; the invention saves energy and reduces consumption by a heat integration technology, a low-temperature absorption technology and a filtering and purifying technology under the condition of ensuring the tail gas treatment effect, simultaneously greatly reduces the discharge amount, and is environment-friendly.
Description
Technical Field
The invention belongs to the field of tail gas treatment, and relates to a method for treating tail gas generated in polyimide film production.
Background
Polyimide is used as a high-performance material, has excellent performances of high temperature resistance, corrosion resistance, radiation resistance, high strength and the like, and is widely applied to the field of film production. In the production process of the polyimide film, a lot of harmful tail gas can be generated, especially, mixed tail gas containing a Dimethylacetamide (DMAC) solvent can be generated in a casting process and a high-temperature imidization process, and the tail gas containing the DMAC solvent is low-toxicity and strongly irritant gas and can pollute the atmosphere and soil when being directly discharged into the atmosphere. In addition, polyimide can generate a plurality of harmful gases in the production process, and has great harm to the environment.
Chinese patent CN 211462404U discloses a tail gas treatment device for polyimide film production, which is provided with a spraying mechanism in a treatment tank, a drying layer is arranged above the spraying mechanism, a carbon fiber drying layer is arranged above the drying layer, the treated tail gas is filtered and purified step by step, and finally discharged to the air, but the quality of the treated tail gas is not mentioned.
Chinese patent CN 203954996U discloses a polyimide exhaust treatment device, and the device is equipped with fan, tower body, gas transmission pipeline, is equipped with recessed staving seal baffle in the tower, and the seal baffle staving is equipped with the plastics clean shot, and the staving top is equipped with the shower head, and tail gas gets into from the bottom of the tower and sprays through the concentration of multilayer seal baffle, improves solvent absorption efficiency, makes the emission satisfy the environmental protection requirement. However, the exhaust gas treatment method only relates to the optimization of the structure of the device, and does not mention the improvement of other aspects such as absorption liquid.
In summary, the prior art has the problems of large emission, high content of organic substances in the exhaust gas, complex process, high treatment cost, high energy consumption and the like, and therefore, a new method with good treatment effect, energy saving, consumption reduction and simple process is needed to be explored to realize the treatment of the tail gas.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for treating tail gas generated in polyimide film production, which has the advantages of good tail gas treatment effect, small emission, simple flow, low energy consumption, easy realization of industrial application and important significance for industrial production.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
first, a method for tail gas treatment is provided, the method comprising the steps of:
(1) cooling tail gas obtained after heat exchange of the discharged tail gas enters the bottom of the absorption tower;
(2) the cooled tail gas is subjected to multistage absorption in an absorption tower by using solutions with different contents of desalted water;
(3) and (3) after the absorption treatment, carrying out heat exchange on the tail gas obtained in the step (2) and newly discharged gas, discharging a part of gas after the heat exchange, and recycling the other part of gas after the filtration and purification.
In some embodiments, the method specifically comprises the steps of:
(1) sending mixed tail gas containing isoquinoline, acetic acid, DMAC (dimethylacetamide), water, air and air dust into a gas-gas heat exchange device through a blower, and after heat exchange, sending cooled mixed tail gas obtained at the tower top into the bottom of an absorption tower;
(2) after the mixed tail gas enters a filler absorption tower, the absorption tower uses desalted water as an absorbent to be supplemented from the top of the tower, and the mixed tail gas in the absorption tower passes through a circulating spray pump and an absorption liquid cooler and is subjected to multistage absorption by using solutions with different contents of desalted water;
(3) the mixed tail gas after absorption treatment meets the quality requirement at the tower top, and then enters a gas-gas heat exchange device to be used as a cold medium to perform heat exchange with the exhaust of a workshop, after the heat exchange, part of gas is discharged, and the other part of gas enters a filtering and purifying device to be subjected to multi-stage filtering and purification and then returns to the workshop for recycling.
(4) And after the mass concentration of the absorption liquid in the tower kettle of the absorption tower reaches a certain degree, discharging and storing the tower kettle.
Furthermore, the mass fractions of the components of the mixed tail gas in the step (1) are that isoquinoline is less than or equal to 1%, acetic acid is less than or equal to 1%, DMAC is less than or equal to 1%, water is less than or equal to 1%, air is greater than 98.3%, and trace air dust is less than or equal to 0.01%.
Further, the mass fraction of the desalted water in the solution in the step (2) is set to be less than or equal to 80% of first-grade water, greater than or equal to 99.20% of second-grade water, greater than or equal to 99.90% of third-grade water, greater than or equal to 99.97% of fourth-grade water and 100% of fifth-grade water from bottom to top of the tower body.
Further, the operation pressure of the absorption tower in the step (2) is 101-105 kpa, the operation temperature of the first-stage water is 25-30 ℃, the operation temperature of the second-stage, third-stage and fourth-stage water is 15-20 ℃, and the operation temperature of the fifth-stage water is 15-25 ℃.
Further, after the tail gas absorption treatment in the step (2), the mass concentration of each component is that VOCs is less than or equal to 40mg/m3Acetic acid is less than or equal to 10mg/m3、DMAC≤20mg/m3Isoquinoline is less than or equal to 27.7mg/m3。
And (3) further, when the mass fraction of the water in the absorption liquid at the tower bottom of the absorption tower in the step (2) is not higher than 80%, discharging from the tower bottom and storing.
Further, the mixed tail gas discharged from a workshop in the gas-gas heat exchange device in the steps (1) and (3) exchanges heat with the exhaust gas at the top of the absorption tower, so that the effective recovery of the waste heat of the system is realized.
Further, the operation temperature of the tail gas production workshop in the step (1) is 75-160 ℃, and the operation pressure is 101-105 kpa (A).
Further, the tail gas in the step (1) enters a heat exchange device to be used as a heat medium.
Further, after the tail gas is subjected to absorption treatment in the step (3), the mass fraction of the amount of the tail gas recycled is more than 90%.
Furthermore, the invention provides a production device for realizing the method, and the production device comprises a blower, a heat exchange device, an absorption tower, a circulating spray pump, a cooler, a defoaming device, a flow regulating device and a filtering and purifying device.
Furthermore, a feed inlet of the circulating spray pump is connected with a discharge outlet of the tower kettle of the absorption tower, and a discharge outlet of the circulating spray pump is connected with a heat medium feed inlet of the absorption liquid cooler.
Furthermore, a defoaming device is arranged at the top of the absorption tower, the filtering and purifying device is a filtering device with more than three levels, and a control device for adjusting the air quantity returned to the workshop is arranged in front of the filtering and purifying device.
In some specific embodiments, the production device comprises a fan, a gas-gas heat exchange device, an absorption tower, a circulating spray pump, an absorption liquid cooler, a defoaming device, a flow regulating device of a gas return vehicle and a filtering and purifying device.
The connection relation of the parts is as follows:
the air blower is arranged after the exhaust gas collection of the workshop and in front of the gas-gas heat exchange device, the mixed tail gas pipe of the workshop is connected with a heat medium inlet of the gas-gas heat exchange device, and a heat medium outlet of the gas-gas heat exchange device is connected with an air inlet at the bottom of the absorption tower;
the feed port of the circulating spray pump is connected with the discharge ports of all stages of the absorption tower body, the feed port of the circulating spray pump of each stage is connected with the discharge port of each stage of the corresponding absorption tower body, the discharge port of the circulating spray pump is correspondingly connected with the heat medium feed port of each stage of the absorption liquid cooler, and the heat medium discharge port of the absorption liquid cooler is correspondingly connected with the spray ports of all stages on the absorption tower;
outside absorption tower cauldron discharge gate connecting tube led the system, the demineralized water moisturizing at the top of the tower was connected the water inlet, and gas heat transfer device cold medium entry is connected to gas column top gas phase mouth, and gas heat transfer device cold medium exit linkage gaseous flow control device entry that returns the car, and flow control device pipeline divide into two the tunnel, and the air discharge of one kind, the filtration purification device entry is connected on another way, leads the workshop through the export of filtration purification device.
Further, the absorption tower is a packed tower.
Furthermore, a defoaming device is arranged at the top of the absorption tower, so that liquid drops are not entrained in the gas phase at the top of the absorption tower.
Furthermore, the absorption stage number of the absorption tower is more than two stages, so that the gas phase emission index at the top of the tower reaches the standard.
Furthermore, the filtering and purifying device is provided with a device which can control the gas cleanliness by more than three levels.
Furthermore, a control device for adjusting the air quantity returned to the workshop is arranged at the branch of the discharge port and the pipeline returned to the workshop in front of the filtering and purifying device.
The basic principle of the invention is to utilize the heat integration technology to achieve the purposes of energy saving and consumption reduction, which is mainly reflected in that the low-temperature multistage water absorption technology with independent concentration is utilized to realize good absorption effect of tail gas components, and simultaneously, the multistage filtration and purification technology is utilized to realize that the exhaust gas returns to a workshop for recycling, thereby achieving the purpose of greatly reducing the exhaust amount. Compared with the prior art, the invention has the following beneficial effects:
(1) the method provided by the invention has the characteristics of good tail gas treatment effect, small discharge amount, simple flow and low energy consumption, and is very environment-friendly;
(2) can realize continuous operation, is easy for industrial application and reduces the production cost.
Drawings
FIG. 1 is a flow diagram of a tail gas treatment process;
labeled as: 01-ambient air; 02-production workshop; 03-workshop mixed tail gas conveying air pipe; 04-a blower; 05-gas heat exchange device; 06-a heat medium outlet air pipe of the air-air heat exchange device; 07-an absorption tower first-stage circulating spray pump inlet pipeline; 08-discharging and storing the tower kettle; 09-circulating spray pump; 10-absorption liquid cooler; 11-cooled absorption liquid; 12-a defoaming device; 13-desalted water; 14-a packed absorption column; 15-an exhaust air pipe at the top of the absorption tower; 16-air exhaust port; 17-a flow regulating device for the gas to return to the vehicle; 18-a filtration purification device; 19-return of the gas to the ductwork of the plant.
Detailed Description
It should be noted that the raw materials used in the present invention are all common commercial products, and the sources thereof are not particularly limited.
Example 1
(1) Sending the mixed tail gas into a gas-gas heat exchange device through a blower, wherein the total tail gas amount is 41042.7kg/h, the mass fractions of the components of the mixed tail gas are 0.04% of isoquinoline, 0.20% of acetic acid, 0.63% of DMAC, 0.81% of water, 98.31% of air and 0.01% of air dust, the pressure before heat exchange of the mixed tail gas is 101kpa (A), and the temperature is 100 ℃;
(2) the mixed tail gas is subjected to heat exchange through a gas-gas heat exchanger, the temperature is 50 ℃, the cooled mixed tail gas obtained from the tower top after the heat exchange enters the bottom of an absorption tower, and the mixed tail gas in the absorption tower is subjected to multistage absorption through a circulating spray pump and an absorption liquid cooler by using solutions with different contents of desalted water; the pressure at the top of the absorption tower is 102kpa (A), the temperature is 19.3 ℃, the mass fraction of each component of the gas phase at the top of the absorption tower is 0.27ppm of isoquinoline, 9.71ppm of acetic acid, 11.48ppm of DMAC, 1.440% of water, 98.557% of air, 0.00% of air dust and 79.38% of the mass fraction of tower bottom water;
(3) the mixed tail gas reaches the quality requirement at the tower top after absorption treatment, then enters a gas-gas heat exchange device as a cold medium to exchange heat with the workshop exhaust gas, after heat exchange, part of gas is discharged, and the other part of gas enters a filtering and purifying device to be subjected to multi-stage filtering and purification and then returns to the workshop for recycling; the gas phase at the top of the absorption tower is subjected to heat exchange through a gas-gas heat exchanger, the temperature is 68.1 ℃, and the mass flow of the gas returned to the workshop is 40940.8 kg/h.
Example 2
(1) Sending the mixed tail gas into a gas-gas heat exchange device through a blower, wherein the total tail gas amount is 36938.43kg/h, the mass fractions of the components of the mixed tail gas are 0.04 percent of isoquinoline, 0.20 percent of acetic acid, 0.63 percent of DMAC, 0.81 percent of water, 98.31 percent of air and 0.01 percent of air dust, the pressure before heat exchange of the mixed tail gas is 101kpa (A), and the temperature is 120 ℃;
(2) the mixed tail gas is subjected to heat exchange through a gas-gas heat exchanger, the temperature is 70 ℃, the cooled mixed tail gas obtained from the tower top after the heat exchange enters the bottom of an absorption tower, and the mixed tail gas in the absorption tower is subjected to multistage absorption through a circulating spray pump and an absorption liquid cooler by using solutions with different contents of desalted water; the pressure at the top of the absorption tower is 102kpa (A), the temperature is 31.2 ℃, the mass fraction of each component of the gas phase at the top of the absorption tower is 0.19ppm of isoquinoline, 15.32ppm of acetic acid, 13.56ppm of DMAC, 1.132% of water, 98.677% of air, 0.00% of air dust and 77.96% of the mass fraction of tower bottom water;
(3) after absorption treatment of the mixed tail gas, the mixed tail gas enters a gas-gas heat exchange device from the tower top to be used as a cold medium to carry out heat exchange with exhaust gas in a workshop, after heat exchange, part of gas is discharged, and the other part of gas enters a filtering and purifying device to be subjected to multistage filtering and purification and then returns to the workshop to be recycled; the gas phase at the top of the absorption tower exchanges heat through a gas-gas heat exchanger, and the mass flow of the gas returning to the workshop is 36846.72 kg/h.
Example 3
(1) Sending the mixed tail gas into a gas-gas heat exchange device through a blower, wherein the total tail gas amount is 41042.7kg/h, the mass fractions of the components of the mixed tail gas are 0.04 percent of isoquinoline, 0.20 percent of acetic acid, 0.63 percent of DMAC, 0.81 percent of water, 98.31 percent of air and 0.01 percent of air dust, the pressure before heat exchange of the mixed tail gas is 109kpa (A), and the temperature is 100 ℃;
(2) the mixed tail gas is subjected to heat exchange through a gas-gas heat exchanger, the temperature is 56 ℃, the cooled mixed tail gas obtained from the tower top after the heat exchange enters the bottom of an absorption tower, and the mixed tail gas in the absorption tower is subjected to multistage absorption with concentration gradient through a circulating spray pump and an absorption liquid cooler; the pressure at the top of the absorption tower is 106kpa (A), the temperature is 20.3 ℃, the mass fraction of each component of the gas phase at the top of the absorption tower is 0.31ppm of isoquinoline, 17.88ppm of acetic acid, 15.34ppm of DMAC, 1.975 percent of water, 98.022 percent of air, 0.00 percent of air dust and 80.18 percent of the mass fraction of tower bottom water;
(3) after absorption treatment of the mixed tail gas, the mixed tail gas enters a gas-gas heat exchange device from the tower top to be used as a cold medium to carry out heat exchange with exhaust gas in a workshop, after heat exchange, part of gas is discharged, and the other part of gas enters a filtering and purifying device to be subjected to multistage filtering and purification and then returns to the workshop to be recycled; the gas phase at the top of the absorption tower exchanges heat through a gas-gas heat exchanger, and the mass flow of the gas returning to the workshop is 40940.8 kg/h.
Comparative example 1
(1) Sending the mixed tail gas into a gas-gas heat exchange device through a blower, wherein the total tail gas amount is 41042.7kg/h, the mass fractions of the components of the mixed tail gas are 0.04 percent of isoquinoline, 0.20 percent of acetic acid, 0.63 percent of DMAC, 0.81 percent of water, 98.31 percent of air and 0.01 percent of air dust, the pressure before heat exchange of the mixed tail gas is 101kpa (A), and the temperature is 100 ℃;
(2) the mixed tail gas is subjected to heat exchange through a gas-gas heat exchanger, the temperature is 50 ℃, the cooled mixed tail gas obtained from the tower top after the heat exchange enters the bottom of an absorption tower, and the mixed tail gas in the absorption tower is subjected to single-stage absorption with single concentration through a circulating spray pump and an absorption liquid cooler by using 100% desalted water; the pressure at the top of the absorption tower is 102kpa (A), the temperature is 19.5 ℃, the mass fraction of each composition component of the gas phase at the top of the absorption tower is 58ppm of isoquinoline, 63ppm of acetic acid, 60ppm of DMAC, 0.8170% of water, 99.1649% of air, 0.00% of air dust and 80.33% of the mass fraction of tower bottom water.
And (4) conclusion: the results in table 1 show that the effect of treating the tail gas in example 1 is the best, the gas source temperature and the tower top operating temperature are respectively increased in steps (1) and (2) in example 2, the indexes of the treated tail gas acetic acid and the treated DMAC become poor, the gas source pressure and the tower top operating pressure are respectively increased in steps (1) and (2) in example 3, the indexes of the treated tail gas acetic acid and the treated DMAC become poor, single-stage absorption with single concentration is performed by desalted water in step (2) in example 4, and the organic matter content of the treated tail gas is high and does not reach the standard.
TABLE 1 content of each organic matter after treatment of exhaust gas
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. A method for tail gas treatment, characterized in that the method comprises the steps of:
(1) cooling tail gas obtained after heat exchange of the discharged tail gas enters the bottom of the absorption tower;
(2) the cooled tail gas is subjected to multistage absorption in an absorption tower by using solutions with different contents of desalted water;
(3) and (3) after the absorption treatment, carrying out heat exchange on the tail gas obtained in the step (2) and newly discharged gas, discharging a part of gas after the heat exchange, and recycling the other part of gas after the filtration and purification.
2. The method as claimed in claim 1, wherein the mass fraction of the desalted water in the solution in step (2) is set to be not more than 80% of first-grade water, not less than 99.20% of second-grade water, not less than 99.90% of third-grade water, not less than 99.97% of fourth-grade water and 100% of fifth-grade water from bottom to top of the tower.
3. The method according to claim 2, wherein the operating temperature of the primary water is 25-30 ℃, the operating temperature of the secondary water, the tertiary water and the quaternary water is 15-20 ℃, and the operating temperature of the quinary water is 15-25 ℃.
4. The process according to claim 1, wherein the operating pressure of the absorption column in the step (2) is 101 to 105 kpa.
5. The method according to claim 1, wherein the operation temperature of the discharged tail gas in the step (1) is 75-160 ℃, and the operation pressure is 101-105 kpa.
6. The method according to claim 1, wherein the discharged tail gas in the step (1) enters a heat exchange device to be used as a heat medium.
7. A production device for realizing the method of any one of claims 1 to 6, wherein the production device comprises a blower, a heat exchange device, an absorption tower, a circulating spray pump, a cooler, a defoaming device, a flow regulating device and a filtering and purifying device.
8. The production device of claim 7, wherein the feed inlet of the circulating spray pump is connected with the discharge outlet of the tower kettle of the absorption tower, and the discharge outlet of the circulating spray pump is connected with the heat medium feed inlet of the absorption liquid cooler.
9. The production apparatus according to claim 7, wherein the absorption tower is provided with a defoaming device at the top thereof, and the filtering and purifying device is a filtering device with three or more stages.
10. The production device of claim 7, wherein the filtering and purifying device is provided with a control device for adjusting the amount of the gas returned to the workshop.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102626558A (en) * | 2012-04-24 | 2012-08-08 | 江苏亚宝绝缘材料股份有限公司 | Tail gas recovery in polyimide film production process |
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| CN211462404U (en) * | 2019-08-07 | 2020-09-11 | 韶关航佳信息咨询有限公司 | Be used for polyimide film production to use tail gas processing apparatus |
| CN112354327A (en) * | 2020-07-15 | 2021-02-12 | 万向一二三股份公司 | Low-energy-consumption NMP gas recovery tower and system |
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| CN102626558A (en) * | 2012-04-24 | 2012-08-08 | 江苏亚宝绝缘材料股份有限公司 | Tail gas recovery in polyimide film production process |
| WO2015161671A1 (en) * | 2014-04-23 | 2015-10-29 | 林小晓 | Polluted air purification system and working method therefor |
| CN203954996U (en) * | 2014-06-27 | 2014-11-26 | 自贡中天胜新材料科技有限公司 | A kind of polyimides emission-control equipment |
| WO2016058400A1 (en) * | 2014-10-16 | 2016-04-21 | 天津奥展兴达化工技术有限公司 | Process for purification of tail gas containing volatile organics |
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| CN209564803U (en) * | 2018-10-11 | 2019-11-01 | 苏州迈沃环保工程有限公司 | A kind of low humidity circulation return air NMP recyclable device |
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| CN110605004A (en) * | 2019-08-30 | 2019-12-24 | 南京鹳山化工科技有限公司 | Internode external circulation low-pressure multistage smoke absorption device and process |
| CN112354327A (en) * | 2020-07-15 | 2021-02-12 | 万向一二三股份公司 | Low-energy-consumption NMP gas recovery tower and system |
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Application publication date: 20220607 |