CN110639345A - Device and method for treating tail gas discharged in disorganized mode in DMF (dimethyl formamide) wastewater recovery process - Google Patents
Device and method for treating tail gas discharged in disorganized mode in DMF (dimethyl formamide) wastewater recovery process Download PDFInfo
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention belongs to the field of tail gas treatment, and relates to a device and a method for treating tail gas discharged disorderly in a DMF (dimethyl formamide) waste water recovery process, wherein the tail gas is washed sequentially by alkali, acid and clear water in a tail gas treatment tower to remove dimethylamine, formic acid, DMF (dimethyl formamide) and other low-boiling organic matters in the tail gas, and the discharged acid liquor and alkali liquor are mixed and returned to a DMF waste water recovery process after the pH is adjusted; the treatment effect is good, the treated purified gas reaches the environmental protection standard, can be directly discharged, and the problems of unorganized tail gas discharge and overproof VOCs in the DMF wastewater recovery process are solved.
Description
Technical Field
The invention belongs to the field of tail gas treatment, and relates to a device and a method for treating tail gas discharged in an unorganized manner in a DMF (dimethyl formamide) wastewater recovery process.
Background
Polyurethane (PU) synthetic leather is an important component of the plastic industry, is widely used in various industries of national economy, and its application field extends in every aspect of people's daily life. The synthetic leather is produced by adopting polyurethane as a basic raw material of a base layer and a surface layer and adopting N, N-dimethyl formamide (DMF) and the like as main solvents through a solution polymerization method. A large amount of DMF wastewater is generated in the production process of the synthetic leather. The DMF wastewater has complex components, and contains suspended substances, precipitates, polyurethane oligomer and a small amount of low-boiling organic auxiliary agent added in the production process of synthetic leather besides main water and DMF.
In order to eliminate the influence of DMF waste water on the environment and reduce the production cost, the DMF waste water needs to be recycled. In the DMF recycling process, in order to prevent equipment blockage, filtering equipment is required to be used for treating the wastewater, and suspended substances and precipitates such as wood powder, calcium carbonate powder, polyester fiber and the like contained in the wastewater are removed in the filtering process to form filter residues; the polyurethane oligomers in the wastewater dissolve in DMF and will be enriched to form a residue after DMF is recovered. The filter residue and the kettle residue need to be handed over to units with related qualifications for treatment. In the process of unloading and loading filter residue and kettle residue by a DMF recovery device, DMF and dimethylamine and formic acid generated by hydrolysis of DMF in the recovery process are contained in the filter residue and the kettle residue, and part of the dimethylamine, the formic acid and a small amount of DMF are volatilized into the air to form tail gas discharged in an unorganized way, so that the filter area and the kettle residue area are filled with pungent smells such as the foul smell of dimethylamine and the sour taste of formic acid, and the operating environment is severe. In addition, in the DMF recycling process, a small amount of dimethylamine and other low-boiling organic matters are carried in the tail gas discharged by the breather valves of equipment such as heat exchangers, intermediate tanks and storage tanks, and the tail gas can also become unorganized tail gas discharged and cause the excessive VOCs of the tail gas if not collected. Meanwhile, the implementation of the volatile organic compound unorganized emission control standard issued by the ministry of ecological environment and the State administration of market supervision and management in combination provides more strict requirements for the unorganized emission control of the volatile organic compounds. Therefore, the tail gas discharged in the process of recycling the DMF wastewater of the synthetic leather must be treated to meet the requirements of environmental protection and labor safety.
At present, tail gas treatment technology in the field of synthetic leather mainly aims at tail gas generated on a synthetic leather production line, and mainly comprises DMF (dimethyl formamide), methylbenzene, butanone and other auxiliaries, tail gas in a DMF wastewater recovery process mainly comprises air, dimethylamine, formic acid, DMF, other low-boiling organic matters and water, and related technology for treating tail gas discharged in a non-tissue manner in the synthetic leather DMF wastewater recovery process does not exist at present, and related treatment devices are also lacked.
Disclosure of Invention
In view of the above, the present invention provides a device and a method for processing tail gas discharged disorderly in a DMF wastewater recovery process, which are used for collecting and processing tail gas in a DMF recovery process, so as to solve the problems of tail gas discharged disorderly and pungent odor.
In order to achieve the purpose, the invention provides the following technical scheme: the device for treating tail gas discharged in an unorganized mode in the DMF wastewater recovery process is used for collecting and treating tail gas generated in the DMF recovery process and comprises a suction pipeline for pumping the tail gas and a tail gas treatment tower communicated with the suction pipeline;
an acid liquid area and an alkali liquid area are arranged in the tail gas treatment tower, the acid liquid area and the alkali liquid area are separated into two chambers through a partition plate, an acid liquid discharge port is formed in the tail gas treatment tower in the acid liquid area, and an alkali liquid discharge port is formed in the tail gas treatment tower in the alkali liquid area;
an alkaline washing area is arranged in a cavity which is higher than the alkaline solution area in the tail gas tower, a tail gas feeding hole which is connected with a suction pipeline in a matched mode is arranged on the tail gas treatment tower in the alkaline washing area, a first gas-liquid contact medium is arranged in the alkaline washing area at a position higher than the tail gas feeding hole, and a riser is arranged on one side, away from the tail gas feeding hole, of the first gas-liquid contact medium; an alkali liquor feeding port is arranged on the tail gas treatment tower between the first gas-liquid contact medium and the riser;
the riser is communicated with an acid washing area, and a downcomer for communicating the acid washing area with the acid liquid area is arranged between the acid washing area and the acid liquid area;
the acid washing area comprises a second gas-liquid contact medium which is arranged in the tail gas treatment tower and is higher than the gas lift pipe, and an acid liquid feed inlet which is arranged on the tail gas treatment tower and is higher than the second gas-liquid contact medium;
a water washing area is arranged above the acid liquor feeding hole, and a third gas-liquid contact medium and a clear water feeding hole which is arranged on the tail gas treatment tower and is higher than the third gas-liquid contact medium are arranged in the water washing area;
the top of the tail gas treatment tower is provided with a purified gas discharge hole.
Optionally, the alkali liquor feeding port is communicated with a fresh alkali liquor pipeline, the alkali liquor discharging port is communicated with an alkali liquor circulating pipeline, and the alkali liquor circulating pipeline is communicated with the fresh alkali liquor pipeline; the acid liquor feed inlet is communicated with a fresh acid liquor pipeline, the acid liquor discharge outlet is communicated with an acid liquor circulating pipeline, and the acid liquor circulating pipeline is communicated with the fresh acid liquor pipeline.
Optionally, an alkali liquor circulating pump is arranged on the alkali liquor circulating pipeline, and an alkali liquor discharging pipeline is also arranged between the alkali liquor circulating pump and the fresh alkali liquor pipeline; an acid liquor circulating pump is arranged on the acid liquor circulating pipeline, an acid liquor discharging pipeline is arranged between the acid liquor circulating pump and the fresh acid liquor pipeline, and the acid liquor discharging pipeline is communicated with the alkali liquor discharging pipeline.
Optionally, a fan is disposed on the suction pipeline.
Optionally, the first gas-liquid contact medium, the second gas-liquid contact medium, and the third gas-liquid contact medium are wire meshes or packings.
Optionally, the partition plate is connected with the inner wall of the tail gas treatment tower and is in a shape of a straight plate or an S-shaped plate.
The method for treating the tail gas discharged in the unorganized mode in the DMF wastewater recovery process by using the device for treating the tail gas discharged in the unorganized mode in the DMF wastewater recovery process comprises the following steps of:
and (3) tail gas alkali washing: tail gas enters an alkaline washing area in the tail gas treatment tower from a tail gas feed inlet through a suction pipeline, alkali liquor is introduced into the alkaline washing area through the alkali liquor feed inlet, the tail gas and the alkali liquor generate chemical reaction and mass transfer action in a first gas-liquid contact medium, DMF (dimethyl formamide) and formic acid in the tail gas react with the alkali to be converted into dimethylamine and formate, the dimethylamine and other tail gas rise together, the formate and unreacted alkali liquor flow into the alkali liquor area and are extracted through an alkali liquor discharge outlet, part of the extracted alkali liquor is added with fresh alkali liquor and then is circulated back to the tail gas treatment tower, and part of the extracted alkali liquor is discharged;
tail gas acid washing: tail gas after reaction with alkali liquor rises to an acid washing area through a riser, acid liquor is introduced into the acid washing area through an acid liquor inlet, the tail gas and the acid liquor generate chemical reaction and mass transfer action in a second gas-liquid contact medium, dimethylamine in the tail gas and acid react to be converted into dimethylamine salt, the dimethylamine salt and unreacted acid liquor flow into an acid liquor area through a downcomer and are extracted through an acid liquor outlet, part of extracted acid liquor is added with fresh acid liquor and then is circulated back to a tail gas treatment tower, and the other part of extracted acid liquor is discharged;
washing tail gas: and the tail gas after the reaction with the acid liquor rises to a water washing area, and has mass transfer effect with the clear water fed from the clear water feed port in a third gas-liquid contact medium, so that other low-boiling organic matters and acid foam carried in the tail gas are removed, and purified gas is obtained and discharged from a purified gas discharge port.
Optionally, mixing the discharged acid solution and alkali solution, adjusting the pH value, and returning to the DMF wastewater recovery process; the addition amount of the fresh alkali liquor is determined by the pH of the alkali liquor area, and the addition amount of the fresh acid liquor is determined by the pH of the acid liquor area; the pH of the alkali liquor zone is controlled to be 9-12, and the pH of the acid liquor zone is controlled to be 1-4.
Optionally, the operating temperature of the tail gas treatment tower is 25-80 ℃ and the operating pressure is 0.1-0.2MPa (absolute pressure).
Optionally, the fresh alkali liquor is sodium hydroxide aqueous solution, and the concentration is 5% -32%; the fresh acid solution is sulfuric acid or hydrochloric acid water solution with the concentration of 5-30%.
The invention has the beneficial effects that:
1. according to the device and the method for treating tail gas discharged in an unorganized mode in the DMF wastewater recovery process, through treatment of the tail gas treatment tower, dimethylamine, formic acid, DMF and other low-boiling organic matters in the tail gas are effectively removed, pungent smells of the tail gas, such as stink smell and sour taste, are eliminated, the problem of large smells in a filtering area and a kettle residue area is solved, and a good operation environment is guaranteed;
2. the device and the method for treating tail gas discharged disorderly in the DMF wastewater recovery process have good treatment effect, the main component of the treated purified gas is air containing a small amount of water vapor, the environment-friendly standard is reached, the purified gas can be directly discharged, and the problems of the tail gas discharged disorderly and the tail gas VOCs exceeding the standard in the DMF wastewater recovery process are solved;
3. according to the device and the method for treating tail gas discharged in an unorganized mode in the DMF wastewater recovery process, acid washing and alkali washing are performed in different areas in the tail gas treatment tower, unreacted acid liquor and alkali liquor can be recycled, the using amount of fresh acid liquor and alkali liquor is reduced, and material consumption is reduced, so that the treatment cost is reduced;
4. according to the device and the method for treating tail gas discharged in an unorganized mode in the DMF wastewater recovery process, the tail gas treatment tower integrates a plurality of tail gas treatment steps, three processes of alkali washing, acid washing and water washing are realized in one tower device, the floor area of the device is reduced, and the device investment is saved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic view of an overall system of the device and method for treating tail gas discharged inorganically in a DMF wastewater recovery process of the invention;
FIG. 2 is a schematic structural diagram of a tail gas treatment tower of the device and the method for treating tail gas discharged in an unorganized manner in the DMF wastewater recovery process.
Reference numerals: the device comprises a kettle residue area 1, a suction pipeline 2, a tail gas treatment tower 3, an acid liquor area 4, an alkali liquor area 5, a partition plate 6, a tail gas feed inlet 7, an alkali liquor discharge outlet 8, a first gas-liquid contact medium 9, an air lift pipe 10, an alkali liquor feed inlet 11, an acid washing area 12, a downcomer 13, an acid liquor discharge outlet 14, a second gas-liquid contact medium 15, a third gas-liquid contact medium 16, a purified gas discharge outlet 17, an acid liquor feed inlet 18, a clear water feed inlet 19, a fresh alkali liquor pipeline 20, an alkali liquor circulation pipeline 21, a fresh acid liquor pipeline 22, an acid liquor circulation pipeline 23, an alkali liquor circulation pump 24, an acid liquor circulation pump 25, an alkali liquor discharge pipeline 26, an acid liquor discharge pipeline 27, an air suction cover 28, a fan 29, an alkali washing area 30.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 2, the device for treating tail gas discharged inorganically in a DMF wastewater recovery process is used for collecting and treating gas in an equipment tail gas outlet 33 or a closed filtering area 32 or a still residue area 1, and includes a suction pipeline 2 for extracting gas in the equipment tail gas outlet 33 or the filtering area 32 or the still residue area 1, and a tail gas treatment tower 3 communicated with the suction pipeline 2; an acid liquid area 4 and an alkali liquid area 5 are arranged at the bottom of the tail gas treatment tower 3, the acid liquid area 4 and the alkali liquid area 5 are separated into two chambers through a partition plate 6, an acid liquid discharge port 14 is formed in the acid liquid area 4 at the bottom of the tail gas treatment tower 3, and an alkali liquid discharge port 8 is formed in the alkali liquid area 5 at the bottom of the tail gas treatment tower 3; an alkaline washing area 30 is arranged in a cavity which is higher than the alkaline solution area 5 in the tail gas tower, a tail gas feed port 7 which is connected with the suction pipeline 2 in a matched mode is arranged on the tail gas treatment tower 3 in the alkaline washing area 30, a first gas-liquid contact medium 9 is arranged in the alkaline washing area 30 at a position which is higher than the tail gas feed port 7, and a riser 10 is arranged on one side, far away from the tail gas feed port 7, of the first gas-liquid contact medium 9; an alkali liquor feeding port 11 is arranged on the tail gas treatment tower 3 between the first gas-liquid contact medium 9 and the riser 10; the riser 10 is communicated with an acid washing area 12, and a downcomer 13 for communicating the acid washing area 12 with the acid liquor area 4 is arranged between the acid washing area 12 and the acid liquor area 4; the acid washing area 12 comprises a second gas-liquid contact medium 15 which is arranged in the tail gas treatment tower 3 and is higher than the position of the riser 10, and an acid liquor feed inlet 18 which is arranged on the tail gas treatment tower 3 and is higher than the second gas-liquid contact medium 15; a water washing area 31 is arranged above the acid liquor feeding hole 18, and a third gas-liquid contact medium 16 and a clear water feeding hole 19 which is arranged on the tail gas treatment tower 3 and is higher than the third gas-liquid contact medium 16 are arranged in the water washing area 31; the top of the tail gas treatment tower 3 is provided with a purified gas discharge port 17.
In the embodiment, the alkali liquor inlet 11 is communicated with a fresh alkali liquor pipeline 20, the alkali liquor outlet 8 is communicated with an alkali liquor circulating pipeline 21, and the alkali liquor circulating pipeline 21 is communicated with the fresh alkali liquor pipeline 20; the acid liquid feed port 18 is communicated with a fresh acid liquid pipeline 22, the acid liquid discharge port 14 is communicated with an acid liquid circulation pipeline 23, the acid liquid circulation pipeline 23 is communicated with the fresh acid liquid pipeline 22, the alkali liquid circulation pipeline 21 is provided with an alkali liquid circulation pump 24, and an alkali liquid discharge pipeline 26 is further arranged between the alkali liquid circulation pump 24 and the fresh alkali liquid pipeline 20; an acid liquor circulating pump 25 is arranged on the acid liquor circulating pipeline 23, an acid liquor discharging pipeline 27 is arranged between the acid liquor circulating pump 25 and the fresh acid liquor pipeline 22, and the acid liquor discharging pipeline 27 is communicated with the alkali liquor discharging pipeline 26.
In this embodiment, the addition amount of the fresh alkali liquor is determined by the PH of the material in the alkali liquor zone 5, and the addition amount of the fresh acid liquor is determined by the PH of the material in the acid liquor zone 4; the pH of the alkali liquor zone is controlled to be 9-12, and the pH of the acid liquor zone is controlled to be 1-4.
In the embodiment, the kettle residual region 1 and the filtering region 32 are partially sealed by using a partition wall, and one end of the suction pipeline 2 close to the kettle residual region 1 or the filtering region 32 is provided with an air suction hood 28; the suction lines 2 are each provided with a fan 29.
In this embodiment, the gases in the still zone 1 or the filtration zone 32 or the equipment off-gas outlet 33 can be collected separately or simultaneously.
In the present embodiment, the first gas-liquid contacting medium 9, the second gas-liquid contacting medium 15, and the third gas-liquid contacting medium 16 are gauzes or packings.
In this embodiment, the partition 6 is connected to the inner wall of the tail gas treatment tower 3, and the shape of the partition is a straight plate, or an S-shaped plate with better stress condition and better stability at the connection with the tower wall can be selected.
The method for treating the tail gas discharged in the unorganized mode in the DMF wastewater recovery process is applied to the device for treating the tail gas discharged in the unorganized mode in the DMF wastewater recovery process, and comprises the following steps of:
and (3) tail gas alkali washing: tail gas enters an alkaline washing area 30 in the tail gas treatment tower 3 from a tail gas feed inlet 7 through a suction pipeline 2, alkali liquor is introduced into the alkaline washing area 30 through an alkali liquor feed inlet 11, the tail gas and the alkali liquor generate chemical reaction and mass transfer action in a first gas-liquid contact medium 9, DMF (dimethyl formamide) and formic acid in the tail gas react with the alkali to be converted into dimethylamine and formate, the dimethylamine and other tail gas rise together, the formate and unreacted alkali liquor flow into an alkali liquor area 5 together and are extracted through an alkali liquor discharge outlet 8, one part of the extracted alkali liquor is added with fresh alkali liquor and then is circulated back to the tail gas treatment tower 3, and the other part of the extracted alkali liquor is discharged;
tail gas acid washing: tail gas after reaction with alkali liquor rises to an acid washing area 12 through a gas rising pipe 10, acid liquor is introduced into the acid washing area 12 through an acid liquor inlet 18, the tail gas and the acid liquor generate chemical reaction and mass transfer action in a second gas-liquid contact medium 15, dimethylamine in the tail gas and acid react and are converted into dimethylamine salt, the dimethylamine salt and unreacted acid liquor flow into an acid liquor area 4 through a downcomer 13 and are extracted through an acid liquor outlet 14, part of the extracted acid liquor is added with fresh acid liquor and then is circulated back to a tail gas treatment tower 3, and part of the extracted acid liquor is discharged;
washing tail gas: the tail gas after the reaction with the acid liquor rises to the water washing area 31, and has a mass transfer effect with the clean water fed from the clean water feed port 19 in the third gas-liquid contact medium 16, so that other low-boiling organic matters and acid foam carried in the tail gas are removed, and purified gas is obtained and discharged from the purified gas discharge port 17.
In this embodiment, the discharged acid solution and alkali solution are mixed and returned to the DMF wastewater recovery process after PH adjustment; the addition amount of the fresh alkali liquor is determined by the pH of the alkali liquor zone 5, and the addition amount of the fresh acid liquor is determined by the pH of the acid liquor zone 4; the PH value of the alkali liquor zone 5 is controlled to be 9-12, and the PH value of the acid liquor zone 4 is controlled to be 1-4.
In this example, the operating temperature of the off-gas treating column 3 is 25 to 80 ℃ and the operating pressure is 0.1 to 0.2MPa (absolute).
In this embodiment, the fresh alkali solution is an aqueous solution of sodium hydroxide, the concentration of which is 5% -32%; the fresh acid solution is sulfuric acid or hydrochloric acid water solution with the concentration of 5-30%.
In the tail gas treatment tower 3, acid washing and alkali washing are carried out in different areas, unreacted acid liquor and alkali liquor can be recycled, the consumption of fresh acid liquor and alkali liquor is reduced, and material consumption is reduced, so that the treatment cost is reduced.
The tail gas treatment tower 3 integrates a plurality of tail gas treatment steps, three processes of alkali washing, acid washing and water washing are realized in one tower device, the floor area of the device is reduced, and the device investment is saved.
By adopting the method and the device provided by the invention to treat the tail gas discharged in the non-organized manner in the synthetic leather DMF wastewater recovery process, dimethylamine, formic acid, DMF and other low-boiling organic matters in the tail gas are effectively removed, the pungent odor of the tail gas, such as foul smell, sour taste and the like, the problem of large odor of the filtering area 32 and the kettle residue area 1 is solved, and a good operation environment is ensured; the treatment effect is good, the treated purified gas reaches the environmental protection standard, can be directly discharged, the problems of unorganized tail gas discharge and overproof VOCs in the DMF wastewater recovery process are solved, and the discharged acid liquor and alkali liquor are mixed and the PH is adjusted and then the mixture can be returned to the DMF wastewater recovery process.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
- The device for treating tail gas discharged in an unorganized mode in the DMF wastewater recovery process is used for collecting and treating tail gas generated in the DMF recovery process, and is characterized in that: comprises a suction pipeline for pumping the tail gas and a tail gas treatment tower communicated with the suction pipeline;an acid liquid area and an alkali liquid area are arranged in the tail gas treatment tower, the acid liquid area and the alkali liquid area are separated into two chambers through a partition plate, an acid liquid discharge hole is formed in the tail gas treatment tower in the acid liquid area, and an alkali liquid discharge hole is formed in the tail gas treatment tower in the alkali liquid area;an alkali washing area is arranged in a cavity higher than an alkali liquor area in the tail gas tower, a tail gas feeding hole matched and connected with a suction pipeline is formed in the alkali washing area on a tail gas treatment tower, a first gas-liquid contact medium is arranged in the alkali washing area at a position higher than the tail gas feeding hole, and a gas lift pipe is arranged on one side, far away from the tail gas feeding hole, of the first gas-liquid contact medium; an alkali liquor feeding port is arranged on the tail gas treatment tower between the first gas-liquid contact medium and the riser;the riser is communicated with an acid washing area, and a downcomer for communicating the acid washing area with the acid liquid area is arranged between the acid washing area and the acid liquid area;the acid washing area comprises a second gas-liquid contact medium which is arranged in the tail gas treatment tower and is higher than the gas lift pipe, and an acid liquid feed inlet which is arranged on the tail gas treatment tower and is higher than the second gas-liquid contact medium;a water washing area is arranged above the acid liquor feeding hole, and a third gas-liquid contact medium and a clear water feeding hole which is arranged on the tail gas treatment tower and is higher than the third gas-liquid contact medium are arranged in the water washing area;and a purified gas discharge hole is formed in the top of the tail gas treatment tower.
- 2. The device for treating tail gas discharged in an unorganized way in the DMF waste water recovery process according to claim 1, which is characterized in that: the alkali liquor feeding port is communicated with a fresh alkali liquor pipeline, the alkali liquor discharging port is communicated with an alkali liquor circulating pipeline, and the alkali liquor circulating pipeline is communicated with the fresh alkali liquor pipeline; the acid liquor feeding port is communicated with a fresh acid liquor pipeline, the acid liquor discharging port is communicated with an acid liquor circulating pipeline, and the acid liquor circulating pipeline is communicated to the fresh acid liquor pipeline.
- 3. The device for treating tail gas discharged in an unorganized way in the DMF waste water recovery process according to claim 2, which is characterized in that: an alkali liquor circulating pump is arranged on the alkali liquor circulating pipeline, and an alkali liquor discharging pipeline is also arranged between the alkali liquor circulating pump and the fresh alkali liquor pipeline; an acid liquor circulating pump is arranged on the acid liquor circulating pipeline, an acid liquor discharging pipeline is arranged between the acid liquor circulating pump and the fresh acid liquor pipeline, and the acid liquor discharging pipeline is communicated with the alkali liquor discharging pipeline.
- 4. The device for treating tail gas discharged in an unorganized way in the DMF waste water recovery process according to claim 1, which is characterized in that: and a fan is arranged on the suction pipeline.
- 5. The device for treating tail gas discharged in an unorganized way in the DMF waste water recovery process according to claim 1, which is characterized in that: the first gas-liquid contact medium, the second gas-liquid contact medium and the third gas-liquid contact medium are wire nets or packing.
- 6. The device for treating tail gas discharged in an unorganized way in the DMF waste water recovery process according to claim 1, which is characterized in that: the partition board is connected with the inner wall of the tail gas treatment tower and is in a straight plate or S-shaped plate shape.
- The method for treating the tail gas discharged in the DMF wastewater recovery process by using the device for treating the tail gas discharged in the DMF wastewater recovery process according to any one of claims 1 to 6, is characterized by comprising the following steps of:and (3) tail gas alkali washing: tail gas enters an alkaline washing area in the tail gas treatment tower from a tail gas feed inlet through a suction pipeline, alkali liquor is introduced into the alkaline washing area through the alkali liquor feed inlet, the tail gas and the alkali liquor generate chemical reaction and mass transfer action in a first gas-liquid contact medium, DMF (dimethyl formamide) and formic acid in the tail gas react with the alkali to be converted into dimethylamine and formate, the dimethylamine and other tail gas rise together, the formate and unreacted alkali liquor flow into the alkali liquor area and are extracted through an alkali liquor discharge outlet, part of the extracted alkali liquor is added with fresh alkali liquor and then is circulated back to the tail gas treatment tower, and part of the extracted alkali liquor is discharged;tail gas acid washing: tail gas after reaction with alkali liquor rises to an acid washing area through a riser, acid liquor is introduced into the acid washing area through an acid liquor inlet, the tail gas and the acid liquor generate chemical reaction and mass transfer action in a second gas-liquid contact medium, dimethylamine in the tail gas and acid react to be converted into dimethylamine salt, the dimethylamine salt and unreacted acid liquor flow into an acid liquor area through a downcomer and are extracted through an acid liquor outlet, part of extracted acid liquor is added with fresh acid liquor and then is circulated back to a tail gas treatment tower, and the other part of extracted acid liquor is discharged;washing tail gas: and the tail gas after the reaction with the acid liquor rises to a water washing area, and has mass transfer effect with the clear water fed from the clear water feed port in a third gas-liquid contact medium, so that other low-boiling organic matters and acid foam carried in the tail gas are removed, and purified gas is obtained and discharged from a purified gas discharge port.
- 8. The method for treating tail gas discharged in an unorganized way in the DMF waste water recovery process according to claim 7, which is characterized in that: mixing the discharged acid solution and alkali solution, adjusting the pH value, and returning to the DMF wastewater recovery process; the addition amount of the fresh alkali liquor is determined by the pH of the alkali liquor area, and the addition amount of the fresh acid liquor is determined by the pH of the acid liquor area.
- 9. The method for treating tail gas discharged in an unorganized way in the DMF waste water recovery process according to claim 7, which is characterized in that: the operation temperature of the tail gas treatment tower is 25-80 ℃, and the operation pressure is 0.1-0.2 MPa.
- 10. The method for treating tail gas discharged in an unorganized way in the DMF waste water recovery process according to claim 7, which is characterized in that: the fresh alkali liquor is sodium hydroxide aqueous solution with the concentration of 5-32 percent; the fresh acid solution is sulfuric acid or hydrochloric acid water solution with the concentration of 5-30%.
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Cited By (1)
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| CN112744945A (en) * | 2020-11-30 | 2021-05-04 | 安徽金禾实业股份有限公司 | Method and device for oxidizing and alkaline hydrolyzing sucralose rectification wastewater |
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