CN112675663A - Toluene tail gas treatment method - Google Patents
Toluene tail gas treatment method Download PDFInfo
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- CN112675663A CN112675663A CN202011347695.2A CN202011347695A CN112675663A CN 112675663 A CN112675663 A CN 112675663A CN 202011347695 A CN202011347695 A CN 202011347695A CN 112675663 A CN112675663 A CN 112675663A
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Abstract
A toluene-containing tail gas treatment process generated in the production of medical intermediates, fine chemicals or engineering plastics and the like is carried out in a toluene tail gas treatment device, wherein the device comprises an absorption tower, a first storage tank, a first centrifugal pump, a heat exchanger, a heater, a flash tower and a second storage tank which are sequentially connected; the invention adopts a mixture of various saturated fatty acid methyl esters as the absorption liquid on the basis of the traditional absorption method, has good absorption effect, effectively solves the production safety problem of the traditional absorption method, better recovers toluene in tail gas, recycles the absorption liquid, does not generate secondary pollution, not only solves the environmental protection problem of toluene tail gas, but also effectively recovers toluene solvent, effectively solves the safety production problem of the traditional absorption method, effectively recovers toluene, reduces the environmental pollution problem caused by tail gas emission, and enables the absorption liquid to be recycled, thereby belonging to the energy-saving and emission-reducing advantageous project.
Description
Technical Field
The invention belongs to the technical field of resource recycling and environmental protection, and particularly relates to a method for treating toluene tail gas generated in the production of medical intermediates, particularly thiophene derivative intermediates, fine chemical engineering or engineering plastics and the like.
Background
In recent years, epoxy resins, nylon fibers, acrylic resins, polyamides, films and artificial leather have been increasingly used in the field of engineering plastics. The epoxy resin is a widely used synthetic resin, toluene is used as a solvent in the process of synthesizing the epoxy resin, the toluene needs to be removed from the epoxy resin finished product, a small amount of toluene is volatilized and is discharged along with tail gas, and the toluene needs to be removedCarrying out toluene tail gas treatment; in addition, caprolactam is used as an intermediate of nylon fibers, the production requirement of caprolactam is continuously improved, a toluene oxidation device is arranged in the production process of caprolactam, air is used as an oxidant to oxidize toluene in a reactor, so that the tail gas emission contains a large amount of toluene, and the content of benzene-toluene in the discharged tail gas is 8-10 g/m3The content of toluene is high, and if the toluene in the tail gas is discharged into the air, the environment can be seriously polluted. Toluene, as a volatile organic compound (Voc), causes great damage to animals, plants and human health: toluene absorbed into the body causes irreversible damage to the central nervous system; the toluene diffuses into the air and reacts with the oxynitride photochemically under the action of ultraviolet rays, which causes serious damage to the ecological environment. Therefore, the technology for recycling the toluene from the toluene tail gas is particularly critical.
The toluene tail gas treatment method comprises an adsorption method, a catalytic oxidation method, a biological treatment method and an absorption method. The adsorption method usually uses activated carbon as an adsorbent, the activated carbon has the characteristics of large specific surface area, small pore diameter, large adsorption capacity, high adsorption performance, high adsorption speed and the like, and is widely applied to tail gas treatment in various industries; the technical key of the catalytic oxidation method is the catalyst, the method can not recycle the useful resources in the tail gas, and the stability and the price of the catalyst are difficult to popularize; the biological treatment method is to treat the toluene tail gas through the degradation capability of unicellular organisms on organic matters, the toluene removal rate of the method is as high as 97 percent, but the treatment amount is too small, so the method is not suitable for large-scale production and application; the absorption method is a more traditional tail gas treatment method, has wide applicability and mature technology, and can absorb the toluene-containing tail gas by using an oily solvent with high boiling point and low vapor pressure by utilizing the solubility of toluene in some solutions, and obtain toluene and an absorbent by flash evaporation separation of the organic solution after absorbing the toluene in a flash tower, so that the toluene can be recovered to be used as a downstream product, and the absorbent can be recycled after being cooled.
Disclosure of Invention
In order to solve the above problems in the prior art, the present invention provides a process for treating toluene-containing tail gas generated in the production of pharmaceutical intermediates, fine chemicals or engineering plastics (such as toluene waste gas generated in the processes of feeding, reacting, rectifying, throwing and the like in the production of thiophene derivative intermediates), which does not need to use flammable and explosive organic solvents such as diesel oil and the like used in the existing absorption method, thereby improving the safety in the production process, and the present invention not only can effectively recover toluene in the tail gas, but also can recycle the absorbed absorbent, and the pretreated tail gas is treated by ultraviolet photolysis and biological trickling filtration (the principle is that nutrient substances required by the growth of microorganisms are sprayed from the top through a biological filler filter bed, and the organic substances in the tail gas are decomposed by using organisms, the absorption rate of the tail gas is high, and the tail gas treatment is only suitable for a small amount of organic substances), can effectively solve the environmental protection problem of toluene tail gas emission.
In order to achieve the purpose, the invention adopts the following technical scheme:
a toluene tail gas treatment method is carried out in a toluene tail gas treatment device, and the device comprises an absorption tower 1, a first storage tank 2, a first centrifugal pump 3, a heat exchanger 4, a heater 5, a flash tower 6 and a second storage tank 8 which are connected in sequence; the first storage tank 2 is connected with the bottom of the absorption tower 1, the second storage tank 8 is connected with the bottom of the flash tower 6 through a pipeline, the inlet of the heater 5 is connected with the heat exchanger 4, and the outlet of the heater 5 is connected with the middle upper part of the flash tower; a treated tail gas outlet 13 is arranged at the top of the absorption tower 1, a toluene tail gas inlet 12 is arranged at the lower part of the absorption tower 1, a spray header 11 which can be filled with an absorbent is arranged between the toluene tail gas inlet 12 and the treated tail gas outlet 13 and is close to the treated tail gas outlet 13, a connecting port 15 is arranged on the wall of the absorption tower 1 through the spray header 11, and the connecting port 15 is connected with the heat exchanger 4 through a cooler 10; the top of the flash tower 6 is connected with a toluene recovery port 14 through a condenser 7, and the condenser 7 is connected with a vacuum system; the second storage tank 8 is connected with the heat exchanger 4 through a second centrifugal pump 9;
the process comprises the following steps:
(1) pumping toluene-containing tail gas into the toluene tail gas inlet through a fan, conveying an absorbent in a second storage tank 8 to a spray header 11 at the top of the tower through a second centrifugal pump 9, a heat exchanger 4 and a cooler 10, carrying out gas-liquid countercurrent contact absorption on the toluene-containing tail gas and the absorbent sprayed by the spray header 11 at the temperature of 20-40 ℃ under normal pressure, absorbing toluene in the toluene-containing tail gas by the absorbent, allowing the absorbent A absorbing toluene to flow into a first storage tank 2 from the bottom of an absorption tower 1, and discharging unabsorbed tail gas from a treated tail gas outlet 13 through aftertreatment; the absorbent contains C16、C18And C20A mixture of saturated fatty acid methyl esters of (a);
(2) the first centrifugal pump 3 is started, the absorbent A for absorbing methylbenzene in the first storage tank 2 is heated to 80-120 ℃ through a heat exchanger 4 and a heater 5 in sequence, the mixture enters a flash tower 6, reduced pressure flash evaporation is carried out at 80-120 ℃, the operating pressure is 0.02 MPa-0.04 MPa, the flashed gas is condensed through a condenser 7, the methylbenzene is discharged and collected from a methylbenzene recovery port 14, and the absorbent subjected to flash evaporation flows into a second storage tank 8 from the bottom of the flash tower 6;
(3) and the second centrifugal pump 9 is started, the absorbent B in the second storage tank 8 exchanges heat with the absorbent A for absorbing methylbenzene through the heat exchanger 4 to reduce the temperature, and the absorbent B is cooled to 20-40 ℃ through the cooler 10, enters the connecting port 15 of the absorption tower 1 through the pipeline, and is sprayed into the absorption tower 1 through the spray header.
The absorbent A and the absorbent B are used for distinguishing the absorbents in different paths and are convenient to describe, and no other special meanings are provided.
Specifically, the toluene-containing tail gas in the step (1) is collected in the Grignard reaction and acidification processes in the production process for preparing 3-methyl-2-thiophenealdehyde from 3-methylthiophene.
Preferably, C in the absorbent16、C18、C20The mass ratio of the saturated fatty acid methyl ester is 20:75: 5.
Further, the flow ratio of the absorbent B to the toluene-containing tail gas in the step (1) is 2-3: 1, and the flow ratio is controlled by a flowmeter.
Further, the post-treatment in the step (1) is further treatment through ultraviolet photolysis and biotrickling filtration, and the discharge is carried out when the national discharge standard is met.
Preferably, the operating pressure of the flash column (6) is 0.02-0.04 MPa.
Further, when the toluene tail gas treatment device is started for the first time or the lost absorbent needs to be used for supplement, the fresh absorbent is added into the second storage tank (8).
Preferably, the feeding amount of the toluene-containing tail gas is 600-1000 Nm3/hr。
Particularly preferably, the feeding amount of the toluene-containing tail gas is 600-700 Nm3/hr。
The invention also provides a special device for the toluene tail gas treatment method, the process is carried out in a toluene tail gas treatment device, and the device comprises an absorption tower 1, a first storage tank 2, a first centrifugal pump 3, a heat exchanger 4, a heater 5, a flash tower 6 and a second storage tank 8 which are connected in sequence; the first storage tank 2 is connected with the bottom of the absorption tower 1, the second storage tank 8 is connected with the bottom of the flash tower 6 through a pipeline, the inlet of the heater 5 is connected with the heat exchanger 4, and the outlet of the heater 5 is connected with the middle upper part of the flash tower 6; a treated tail gas outlet 13 is arranged at the top of the absorption tower 1, a toluene tail gas inlet 12 is arranged at the lower part of the absorption tower 1, a spray header 11 which can be filled with an absorbent is arranged between the toluene tail gas inlet 12 and the treated tail gas outlet 13 and is close to the treated tail gas outlet 13, a connecting port 15 is arranged on the wall of the absorption tower by the spray header, and the connecting port 15 is connected with the heat exchanger 4 through a cooler 10; the top of the flash tower 6 is connected with a toluene recovery port 14 through a condenser 7, and the condenser 7 is connected with a vacuum system; the second storage tank 8 is connected with the heat exchanger 4 through a second centrifugal pump 9.
Compared with the prior art, the invention adopts a mixture of a plurality of saturated fatty acid methyl esters as the absorbent on the basis of the traditional absorption method, has better absorption effect, and the absorption rate of the absorbent to the toluene tail gas in the absorption tower is more than 80 percent (the absorption rate refers to the ratio of the difference of the toluene content in the tail gas inlet and the toluene content in the tail gas outlet to the toluene content in the tail gas inlet, and the reduction of the toluene content in the tail gas outlet to the toluene content in the tail gas inlet is the absorption amount). The invention effectively solves the problem of safe production of the traditional absorption method, effectively recovers toluene, reduces the problem of environmental pollution caused by tail gas emission, enables absorption liquid to be recycled, and belongs to the project with the advantages of energy conservation and emission reduction. The treatment process is simple, the treated tail gas is further treated by ultraviolet photolysis and biotrickling filtration processes to reach the national emission standard, the toluene solvent is effectively recovered, the pollution is reduced, and the method conforms to the national policy of encouraging energy conservation and emission reduction for chemical industry.
Drawings
FIG. 1 is a schematic diagram of a toluene offgas processing apparatus of the present invention.
Wherein, 1-an absorption tower; 2-a first storage tank; 3-a first centrifugal pump; 4-a heat exchanger; 5-a heater; 6-a flash column; 7-a condenser; 8-a second storage tank; 9-a second centrifugal pump; 10-a cooler; 11-a shower head; a 12-toluene tail gas inlet; 13-treated tail gas outlet; 14-toluene recovery port; 15-connecting port.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The toluene tail gas treatment device disclosed by the invention is shown in a figure 1, and comprises an absorption tower 1, a first storage tank 2, a first centrifugal pump 3, a heat exchanger 4, a heater 5, a flash tower 6 and a second storage tank 8 which are sequentially connected; the first storage tank 2 is connected with the bottom of the absorption tower 1, the second storage tank 8 is connected with the bottom of the flash tower 6 through a pipeline, the inlet of the heater 5 is connected with the heat exchanger 4, and the outlet of the heater 5 is connected with the middle upper part of the flash tower 6; a treated tail gas outlet 13 is arranged at the top of the absorption tower 1, a toluene tail gas inlet 12 is arranged at the lower part of the absorption tower 1, a spray header 11 which can be filled with an absorbent is arranged between the toluene tail gas inlet 12 and the treated tail gas outlet 13 and is close to the treated tail gas outlet 13, a connecting port 15 is arranged on the wall of the absorption tower by the spray header, and the connecting port 15 is connected with the heat exchanger 4 through a cooler 10; the top of the flash tower 6 is connected with a toluene recovery port 14 through a condenser 7, and the condenser 7 is connected with a vacuum system; the second storage tank 8 is connected with the heat exchanger 4 through a second centrifugal pump 9.
The process comprises the following steps:
(1) pumping toluene-containing tail gas into the toluene tail gas inlet through a fan, conveying an absorbent in a second storage tank 8 to a spray header 11 at the top of the tower through a second centrifugal pump 9, a heat exchanger 4 and a cooler 10, carrying out gas-liquid countercurrent contact absorption on the toluene-containing tail gas and the absorbent sprayed by the spray header 11 at the temperature of 20-40 ℃ under normal pressure, absorbing toluene in the toluene-containing tail gas by the absorbent, allowing the absorbent A absorbing toluene to flow into a first storage tank 2 from the bottom of an absorption tower 1, and discharging unabsorbed tail gas from a treated tail gas outlet 13 through aftertreatment;
(2) the first centrifugal pump 3 is started, the absorbent A for absorbing methylbenzene in the first storage tank 2 is heated to 80-120 ℃ through a heat exchanger 4 and a heater 5 in sequence, the mixture enters a flash tower 6, reduced pressure flash evaporation is carried out at 80-120 ℃, the operating pressure is 0.02 MPa-0.04 MPa, the flashed gas is condensed through a condenser 7, the methylbenzene is discharged and collected from a methylbenzene recovery port 14, and the absorbent subjected to flash evaporation flows into a second storage tank 8 from the bottom of the flash tower 6;
(3) and the second centrifugal pump 9 is started, the absorbent B in the second storage tank 8 exchanges heat with the absorbent A for absorbing methylbenzene through the heat exchanger 4 to reduce the temperature, and the absorbent B is cooled to 20-40 ℃ through the cooler 10, enters the connecting port 15 of the absorption tower 1 through the pipeline, and is sprayed into the absorption tower 1 through the spray header.
In the following examples, the toluene tail gas is from an exhaust gas in a process for producing 3-methyl-2-thiophenealdehyde, and the process specifically comprises the following steps: chlorination: carrying out chlorination reaction on 3-methylthiophene and sulfuryl chloride to generate 3-methyl-2-chlorothiophene; secondly, post-treatment: adding alkali into the chlorination solution for neutralization, and then carrying out vacuum rectification to obtain 3-methyl-2-chlorothiophene, wherein toluene exists as a solvent in the process; ③ Grignard reaction: the 3-methyl-2-chlorothiophene and magnesium metal are subjected to a Grignard reaction to generate 3-methyl-2-magnesium chloride thiophene, and tetrahydrofuran, toluene and bromoethane exist in the process and do not participate in the reaction; fourthly, acidification: the Grignard reagent reacts with carbon dioxide to generate a crude product of 3-methyl-2-thiophenecarboxylic acid, and tetrahydrofuran and toluene exist as solvents in the process; hydrogenation: the 3-methyl-2-thiophenecarboxylic acid is hydrogenated under high pressure to obtain the finished product of 3-methyl-2-thiophenealdehyde. The toluene tail gas in the embodiment comes from the reaction process and the rectification recovery process in the third step and the fourth step of the production process.
Example 1
The toluene-containing tail gas has a particle size of 600Nm3The feed amount per hr enters an absorption tower for treatment, wherein the toluene content is 8000mg/m3With the above-mentioned inclusion C16、C18、C20The saturated fatty acid methyl ester (the mass ratio of which is 20:75:5) is used as an absorbent (at the beginning, 5m of fresh absorbent is added into an 8-second storage tank3) Absorbent flow rate of 1.8m3The mass ratio of liquid to gas flow of the absorbent to the toluene tail gas is 2kgLiquid for treating urinary tract infection/kgQi (Qi)Carrying out gas-liquid countercurrent contact at the temperature of 25 ℃ and normal pressure to finish the toluene absorption process; after being absorbed by the absorbent, the concentration of toluene in the benzene-removed tail gas is reduced to 805mg/m3(ii) a The toluene-containing absorbent enters a first storage tank 2, is heated to 90 ℃ by a heater by a first centrifugal pump 3 and then enters a flash tower, the operating pressure (absolute pressure) of the flash tower is 0.025MPa, and the toluene is recovered after flash condensation; the absorbent after flash evaporation treatment enters a storage tank, is cooled to 25 ℃ by a pump through a heat exchanger and a cooler, and is conveyed to the top of an absorption tower for absorption operation.
Example 2
The toluene-containing tail gas has a purity of 700Nm3The feed amount per hr enters an absorption tower for treatment, wherein the toluene content is 8000mg/m3With the above-mentioned inclusion C16、C18、C20The saturated fatty acid methyl ester (the mass ratio of which is 20:75:5) is used as an absorbent (at the beginning, 5m of fresh absorbent is added into an 8-second storage tank3)，The flow rate of the absorbent was 2.3m3The mass ratio of liquid to gas flow of the absorbent to the toluene tail gas is 2.2kgLiquid for treating urinary tract infection/kgQi (Qi)Carrying out gas-liquid countercurrent contact at the temperature of 25 ℃ and normal pressure to finish the toluene absorption process; after being absorbed by the absorbent, the concentration of toluene in the benzene-removed tail gas is reduced to 700mg/m3(ii) a The toluene-containing absorbent enters a first storage tank 2, is heated to 90 ℃ by a heater by a first centrifugal pump 3 and then enters a flash tower, the operating pressure (absolute pressure) of the flash tower is 0.025MPa, and the toluene is recovered after flash condensation; the absorbent after flash evaporation treatment enters a storage tank, is cooled to 25 ℃ by a pump through a heat exchanger and a cooler, and is conveyed to the top of an absorption tower for absorption operation.
Example 3
The toluene-containing tail gas has a particle size of 600Nm3The feed amount per hr enters an absorption tower for treatment, wherein the toluene content is 9000mg/m3With the above-mentioned inclusion C16、C18、C20The saturated fatty acid methyl ester (the mass ratio of which is 20:75:5) is used as an absorbent (at the beginning, 5m of fresh absorbent is added into an 8-second storage tank3) Absorbent flow of 2m3The mass ratio of liquid to gas flow of the absorbent to the toluene tail gas is 2.2kgLiquid for treating urinary tract infection/kgQi (Qi)Carrying out gas-liquid countercurrent contact at the temperature of 25 ℃ and normal pressure to finish the toluene absorption process; after being absorbed by the absorbent, the concentration of toluene in the benzene-removed tail gas is reduced to 725mg/m3(ii) a The toluene-containing absorbent enters a first storage tank 2, is heated to 90 ℃ by a heater by a first centrifugal pump 3 and then enters a flash tower, the operating pressure (absolute pressure) of the flash tower is 0.025MPa, and the toluene is recovered after flash condensation; the absorbent after flash evaporation treatment enters a storage tank, is cooled to 25 ℃ by a pump through a heat exchanger and a cooler, and is conveyed to the top of an absorption tower for absorption operation.
Claims (10)
1. A toluene tail gas treatment method is characterized by comprising the following steps: the process is carried out in a toluene tail gas treatment device, and the device comprises an absorption tower (1), a first storage tank (2), a first centrifugal pump (3), a heat exchanger (4), a heater (5), a flash tower (6) and a second storage tank (8) which are connected in sequence; the first storage tank (2) is connected with the bottom of the absorption tower (1), the second storage tank (8) is connected with the bottom of the flash tower (6) through a pipeline, the inlet of the heater (5) is connected with the heat exchanger (4), and the outlet of the heater (5) is connected with the middle upper part of the flash tower; a treated tail gas outlet (13) is arranged at the top of the absorption tower (1), a toluene tail gas inlet (12) is arranged at the lower part of the absorption tower (1), a spray header (11) which can be filled with an absorbent is arranged between the toluene tail gas inlet (12) and the treated tail gas outlet (13) and is close to the treated tail gas outlet (13), a connecting port (15) is arranged on the wall of the absorption tower (1) of the spray header (11), and the connecting port (15) is connected with the heat exchanger (4) through a cooler (10); the top of the flash tower (6) is connected with a toluene recovery port (14) through a condenser (7), and the condenser (7) is connected with a vacuum system; the second storage tank (8) is connected with the heat exchanger (4) through a second centrifugal pump (9);
the process comprises the following steps:
(1) pumping toluene-containing tail gas into the toluene tail gas inlet through a fan, conveying an absorbent in a second storage tank (8) to a spray header (11) at the top of the tower through a heat exchanger (4) and a cooler (10) by a second centrifugal pump (9), carrying out gas-liquid countercurrent contact absorption on the toluene-containing tail gas and the absorbent sprayed by the spray header (11) in an absorption tower (1) at the temperature of 20-40 ℃ under normal pressure, absorbing toluene in the toluene-containing tail gas by the absorbent, allowing the absorbent A absorbing toluene to flow into a first storage tank (2) from the bottom of the absorption tower (1), and discharging unabsorbed tail gas from a treated tail gas outlet (13) through aftertreatment; the absorbent contains C16、C18And C20A mixture of saturated fatty acid methyl esters of (a);
(2) the first centrifugal pump (3) is started, the absorbent A for absorbing the methylbenzene in the first storage tank (2) is sequentially heated to 80-120 ℃ through the heat exchanger (4) and the heater (5) and enters the flash tower (6), reduced pressure flash evaporation is carried out at 80-120 ℃, the operating pressure is 0.02 MPa-0.04 MPa, the flashed gas is condensed through the condenser (7), the methylbenzene is discharged and collected from the methylbenzene recovery port (14), and the absorbent subjected to flash evaporation flows into the second storage tank (8) from the bottom of the flash tower (6);
(3) and the second centrifugal pump (9) is started, the absorbent B in the second storage tank (8) exchanges heat with the absorbent A for absorbing methylbenzene through the heat exchanger (4), is cooled to 20-40 ℃ through the cooler (10), then enters the connecting port (15) of the absorption tower (1) through the pipeline, and is sprayed into the absorption tower (1) through the spray header.
2. The toluene off-gas treatment method according to claim 1, characterized in that: the toluene-containing tail gas in the step (1) is collected in the Grignard reaction and acidification processes in the production process for preparing 3-methyl-2-thiophenealdehyde from 3-methylthiophene.
3. The toluene off-gas treatment method according to claim 1, characterized in that: in the absorbent C16、C18、C20The mass ratio of the saturated fatty acid methyl ester is 20:75: 5.
4. The toluene off-gas treatment method according to claim 1, characterized in that: in the step (1), the flow ratio of the absorbent B to the toluene-containing tail gas is 2-3: 1.
5. The toluene off-gas treatment method according to claim 1, characterized in that: the post-treatment in the step (1) is further treatment through ultraviolet photolysis and biotrickling filtration, and the discharge is carried out when the national discharge standard is met.
6. The toluene off-gas treatment method according to claim 1, characterized in that: the operating pressure of the flash tower (6) is 0.02-0.04 MPa.
7. The toluene off-gas treatment method according to claim 1, characterized in that: when the toluene tail gas treatment device is started for the first time or the lost absorbent needs to be used again, the fresh absorbent is added into the second storage tank (8).
8. The toluene off-gas treatment method according to claim 1, characterized in that: the feeding amount of the toluene-containing tail gas is 600-1000 Nm3/hr。
9. The toluene offgas processing method according to claim 9, characterized in that: the feeding amount of the toluene-containing tail gas is 600-700 Nm3/hr。
10. The special device for the toluene tail gas treatment method according to claim 1, characterized in that: the special device comprises an absorption tower (1), a first storage tank (2), a first centrifugal pump (3), a heat exchanger (4), a heater (5), a flash tower (6) and a second storage tank (8) which are connected in sequence; the first storage tank (2) is connected with the bottom of the absorption tower (1), the second storage tank (8) is connected with the bottom of the flash tower (6) through a pipeline, the inlet of the heater (5) is connected with the heat exchanger (4), and the outlet of the heater (5) is connected with the middle upper part of the flash tower; a treated tail gas outlet (13) is arranged at the top of the absorption tower (1), a toluene tail gas inlet (12) is arranged at the lower part of the absorption tower (1), a spray header (11) which can be filled with an absorbent is arranged between the toluene tail gas inlet (12) and the treated tail gas outlet (13) and is close to the treated tail gas outlet (13), a connecting port (15) is arranged on the wall of the absorption tower by the spray header, and the connecting port (15) is connected with the heat exchanger (4) through a cooler (10); the top of the flash tower (6) is connected with a toluene recovery port (14) through a condenser (7), and the condenser (7) is connected with a vacuum system; the second storage tank (8) is connected with the heat exchanger (4) through a second centrifugal pump (9).
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343208A (en) * | 2008-08-22 | 2009-01-14 | 山东聊城中盛蓝瑞化工有限公司 | Desorption technique for methylbenzene in tail gas from benzyl chloride preparation |
| CN101683584A (en) * | 2009-07-30 | 2010-03-31 | 南通润鸿生物化学有限公司 | Tail gas recycling system |
| CN101703869A (en) * | 2009-10-28 | 2010-05-12 | 马军 | New method and device for recovering organic solvent from waste gas |
| CN102441314A (en) * | 2010-10-12 | 2012-05-09 | 中国石油化工股份有限公司 | Oil gas recovery method |
| CN103143237A (en) * | 2013-03-15 | 2013-06-12 | 扬州新奇特电缆材料有限公司 | Toluene-containing tail gas recycling process in refractory mica tape production |
| CN205774203U (en) * | 2016-07-06 | 2016-12-07 | 上海聚友化工有限公司 | Organic recovery device in a kind of Synthetic Leather waste gas |
| CN109806713A (en) * | 2019-01-22 | 2019-05-28 | 河北泰帆环保工程有限公司 | A kind of toluene waste gas processing method |
| CN110180329A (en) * | 2019-06-25 | 2019-08-30 | 中国石油大学(华东) | Novel benzene series volatile organic compounds absorbent and its preparation method and application |
-
2020
- 2020-11-26 CN CN202011347695.2A patent/CN112675663A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101343208A (en) * | 2008-08-22 | 2009-01-14 | 山东聊城中盛蓝瑞化工有限公司 | Desorption technique for methylbenzene in tail gas from benzyl chloride preparation |
| CN101683584A (en) * | 2009-07-30 | 2010-03-31 | 南通润鸿生物化学有限公司 | Tail gas recycling system |
| CN101703869A (en) * | 2009-10-28 | 2010-05-12 | 马军 | New method and device for recovering organic solvent from waste gas |
| CN102441314A (en) * | 2010-10-12 | 2012-05-09 | 中国石油化工股份有限公司 | Oil gas recovery method |
| CN103143237A (en) * | 2013-03-15 | 2013-06-12 | 扬州新奇特电缆材料有限公司 | Toluene-containing tail gas recycling process in refractory mica tape production |
| CN205774203U (en) * | 2016-07-06 | 2016-12-07 | 上海聚友化工有限公司 | Organic recovery device in a kind of Synthetic Leather waste gas |
| CN109806713A (en) * | 2019-01-22 | 2019-05-28 | 河北泰帆环保工程有限公司 | A kind of toluene waste gas processing method |
| CN110180329A (en) * | 2019-06-25 | 2019-08-30 | 中国石油大学(华东) | Novel benzene series volatile organic compounds absorbent and its preparation method and application |
Non-Patent Citations (2)
| Title |
|---|
| 李再资等: "《化工基础》", 31 December 1990, 华南理工大学出版社 * |
| 谢克昌等: "《化石能源的清洁高效可持续开发利用论文集 第二届"中国工程院/国家能源局 能源论坛"》", 31 December 2012, 煤炭工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114225626A (en) * | 2021-11-26 | 2022-03-25 | 安徽金禾实业股份有限公司 | Analysis method of carbon fiber tail gas absorption unit in hydrogen peroxide production |
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