CN116099336A - Caprolactam refining tail gas treatment device and method - Google Patents
Caprolactam refining tail gas treatment device and method Download PDFInfo
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- CN116099336A CN116099336A CN202310178990.7A CN202310178990A CN116099336A CN 116099336 A CN116099336 A CN 116099336A CN 202310178990 A CN202310178990 A CN 202310178990A CN 116099336 A CN116099336 A CN 116099336A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—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
- B01D53/1493—Selection of liquid materials for use as absorbents
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/11—Purification; Separation; Use of additives by absorption, i.e. purification or separation of gaseous hydrocarbons with the aid of liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a caprolactam refined tail gas treatment device and a method, and relates to the technical field of chemical equipment.
Description
Technical Field
The invention relates to the technical field of chemical equipment, in particular to a caprolactam refining tail gas treatment device and a caprolactam refining tail gas treatment method.
Background
Caprolactam is an important chemical raw material, and is mainly used for producing polyamide slices, and further processing into fibers, engineering plastics and the like. With the development of downstream industries, the requirements on caprolactam quality are also higher and higher, and the requirements on more efficient caprolactam refining technology are also higher and higher. The main procedures of caprolactam refining are as follows: extracting, alkali washing, back extraction, steam stripping, ion exchange, hydrogenation, triple effect evaporation, light component removal and heavy component removal. Wherein benzene is used as an extractant in the extracted process to extract caprolactam from the aqueous caprolactam solution, and inorganic impurities such as ammonium sulfate and the like remain in the aqueous phase. The back extraction is to extract caprolactam in benzene into water to form water and to separate benzene-soluble impurity from caprolactam. Benzene-containing tail gas is arranged at the top of a tower in the processes of extraction, alkali washing, back extraction, steam stripping and benzene distillation in the caprolactam refining process, and benzene is a high-toxicity solvent, so that the benzene-containing tail gas treatment is very important, and most practical devices are designed in such a way that the benzene-containing tail gas of each tower is discharged to a factory through a pipeline after being subjected to gas-liquid separation by a tail gas buffer tank for incineration treatment or is discharged after being treated by a disposable adsorbent adsorption tower provided with activated carbon particles/activated carbon fibers/molecular sieves and the like, and the prior design has two defects in practice: on one hand, the benzene solvent is not fully recovered, so that benzene loss is increased; on the other hand, the adopted adsorbents are disposable, and the replacement cost of the adsorbents is high. Therefore, it is very necessary and significant to design a more efficient method and device for treating benzene-containing tail gas in caprolactam refining process.
Disclosure of Invention
The invention aims to provide a caprolactam refining tail gas treatment device and method, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a caprolactam refining tail gas treatment device, includes the amide oil storage tank that is used for buffering the absorption liquid, amide oil storage tank upper end is equipped with the ammonium sulfate device that is used for carrying the absorption liquid, amide oil storage tank's play liquid end and amide oil delivery pump's feed liquor end intercommunication, amide oil delivery pump connects the tail gas absorption tower that is used for absorbing tail gas, the feed liquor position of tail gas absorption tower sets up in the upper left side, the inside mixed part that is used for improving absorption liquid and tail gas contact effect that is equipped with of tail gas absorption tower, the gas supply part that is used for carrying tail gas is connected in the tail gas absorption tower outside of mixed part, the flowing back position of tail gas absorption tower bottom is connected tower cauldron solution discharge pump, the liquid outlet end of tower cauldron solution discharge pump is connected and is extracted the unit, the exhaust end at tail gas absorption tower top is connected and is used for the tail gas buffer tank of buffering, the bottom of tail gas buffer tank is equipped with the benzene incomplete liquid pot that is used for carrying the incomplete leaf, the gas vent of tail gas buffer tank upper end and the exhaust end intercommunication of tail gas pump, the exhaust end connection branch liquid pot that is taken out the pump, the exhaust end connection is used for the flare-out the tail gas to the tail gas, the exhaust end of branch liquid pot is connected to the treatment corridor for burning the flare;
based on the technical scheme, the invention also provides the following optional technical schemes:
in one alternative: the tail gas absorption tower surface where the mixing component is located is provided with a movable door.
In one alternative: the mixing component comprises at least one rotating disk which is rotatably arranged on the inner wall of the tail gas absorption tower, a plurality of mounting holes are formed in the rotating disk, a slow flow structure is matched in each mounting hole, and the lower end of the rotating disk is connected with a rotating piece for driving the rotating disk to rotate.
In one alternative: the rotating piece comprises a water storage disc arranged below the rotating disc, the middle position of the water storage disc is connected with the middle position of the bottom of the rotating disc through a central rod, a plurality of liquid draining side pipes are arranged outside the central rod, each liquid draining side pipe is arranged at an acute angle with the tangential plane of the water storage disc, and the projection of the mounting hole falls on the water storage disc.
In one alternative: the slow flow structure comprises a charging frame for filling porous blocks, the outer side of the charging frame is slidably arranged with the mounting holes, ventilation holes are distributed in the bottom of the charging frame, and a clamping ring in pressing contact with the top of the rotating disc is arranged at the upper end of the porous blocks.
In one alternative: the porous block is porous stone or stainless steel porous block.
In one alternative: the lower end of each mounting hole is provided with a filter screen structure, and the filter screen structure can form a liquid film structure when liquid falls on the filter screen structure.
In one alternative: the side of tail gas absorption tower is equipped with at least one side lever, the side lever upside is equipped with the scraping brush that contacts with rotary disk lower terminal surface.
In one alternative: the air supply part comprises a tail gas pipe of the extraction tower, a tail gas pipe of the washing tower, a tail gas pipe of the stripping tower, a tail gas pipe of the benzene stripping system and a tail gas pipe of the benzene distillation tower, and throttle valves are arranged on the corresponding tail gas pipes.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a tail gas absorption tower is added in the caprolactam tail gas treatment design, and amide oil from an ammonium sulfate device is adopted to absorb tail gas at the top of an extraction tower, tail gas from a washing tower, tail gas from the top of a stripping tower, tail gas from a benzene stripping system and benzene distillation tail gas, so that benzene in the tail gas is recovered, the benzene content in the tail gas is reduced, the benzene content in the tail gas is far lower than that in the prior art, and the tail gas treatment capacity of the caprolactam device for removing a torch is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of a rotating disc structure according to the present invention.
Fig. 3 is a schematic view of the structure of the water storage disc of the present invention.
Reference numerals annotate: the device comprises a sulfur ammonium device, a 2 amide oil storage tank, a 3 amide oil delivery pump, a 4 tail gas absorption tower, a 5 tower kettle solution discharge pump, a 6 tail gas buffer tank, a 7 extraction unit, an 8 tail gas extraction pump, a 9 benzene residual liquid tank, a 10 tail gas liquid separating tank, a 11 extraction tower tail gas pipe, a 12 washing tower tail gas pipe, a 13 stripping tower tail gas pipe, a 14 benzene stripping system tail gas, a 15 benzene distillation tower tail gas pipe and a 16 factory flare pipe gallery;
20 rotating disc, 21 clasp, 22 porous block, 23 charging frame, 24 scraping brush, 25 side rod, 26 center rod, 27 water storage disc, 28 liquid discharge side pipe, 29 mounting hole.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
In one embodiment, as shown in fig. 1-3, a caprolactam refined tail gas treatment device comprises an amide oil storage tank 2 for buffering absorption liquid, an ammonium sulfate device 1 for conveying the absorption liquid is arranged at the upper end of the amide oil storage tank 2, the liquid outlet end of the amide oil storage tank 2 is communicated with the liquid inlet end of an amide oil conveying pump 3, the amide oil conveying pump 3 is connected with a tail gas absorption tower 4 for absorbing tail gas, the liquid inlet end of the tail gas absorption tower 4 is arranged at the left upper side, a mixing part for improving the contact effect of the absorption liquid and the tail gas is arranged in the tail gas absorption tower 4, liquid and gas are fully contacted through the mixing part, so that toxic substances of the tail gas can be absorbed, and the effect of the tail gas absorption is guaranteed, the outer side of the tail gas absorption tower 4 below the mixing part is connected with a gas supply part for conveying the tail gas, the liquid outlet position of the bottom of the tail gas absorption tower 4 is connected with a tower kettle solution discharge pump 5, the liquid outlet end of the tower kettle solution discharge pump 5 is connected with a tail gas buffer tank 6 for absorbing the tail gas, the tail gas residual liquid tank 6 is arranged at the top of the tail gas absorption tower 4, the tail gas residual liquid tank 6 is connected with a tail gas buffer tank 6 for the tail gas tank 6, the tail gas residual liquid tank 6 is connected with a tail gas pump 10 through a tail gas absorption pipe section, and the tail gas tank 10 is fully contacted with the tail gas absorption part is arranged in the tail gas absorption pipe section, and the tail gas absorption pipe section is fully pumped through the tail gas absorption pipe section 10, and the tail gas absorption pipe section is fully pumped through the tail gas absorption tank 10;
the movable door is arranged on the surface of the tail gas absorption tower 4 where the mixing component is positioned, so that cleaning operation on the mixing part is convenient in the later period, and the efficient absorption effect of the product is ensured;
the mixing component comprises at least one rotary disk 20 rotatably arranged on the inner wall of the tail gas absorption tower 4, a plurality of mounting holes 29 are formed in the rotary disk 20, a slow flow structure is matched in each mounting hole 29, the lower end of the rotary disk 20 is connected with a rotary part for driving the rotary disk to rotate, so that downward flowing liquid can be divided by the slow flow structure, and the downward flowing liquid can be fully contacted with upward flowing gas, thereby improving the absorption effect on toxic substances in tail gas;
the rotating member comprises a water storage disc 27 arranged below the rotating disc 20, the middle position of the water storage disc 27 is connected with the middle position of the bottom of the rotating disc 20 through a central rod 26, a plurality of liquid discharge side pipes 28 are arranged outside the central rod 26, each liquid discharge side pipe 28 is arranged at an acute angle with the tangential plane of the water storage disc 27, the projection of the mounting hole 29 falls on the water storage disc 27, so that the water storage disc 27 can collect liquid from top to bottom, and then a reaction force is generated when the liquid is discharged along the liquid discharge side pipes 28, so that the rotating disc 20 rotates, the liquid slides down in a slow flow structure at a slower speed under the action of centrifugal force, and the mixing of gas and liquid is disturbed, thereby being beneficial to the full absorption of toxic substances in gas;
the slow flow structure comprises a charging frame 23 for charging porous blocks 22, wherein the outer side of the charging frame 23 is slidably arranged with mounting holes 29, ventilation holes are distributed at the bottom of the charging frame 23, a clamping ring 21 which is in abutting contact with the top of a rotating disc 20 is arranged at the upper end of the porous blocks 22, and the porous blocks 22 are porous stones;
the lower end of each mounting hole 29 is provided with a filter screen structure, and the filter screen structure forms a liquid film structure when liquid falls on the filter screen structure, so that the filter screen structure is favorable for fully mixing with gas;
the side of the tail gas absorption tower 4 is provided with at least one side rod 24, and the upper side of the side rod 24 is provided with a scraping brush 24 which is contacted with the lower end surface of the rotary disk 20, so that the filter screen structure can be scraped, and the problem of blockage at the lower end of the rotary disk 20 is avoided;
the air supply part comprises a tail gas pipe 11 of the stripping tower, a tail gas pipe 12 of the washing tower, a tail gas pipe 13 of the back-extraction tower, a tail gas pipe 14 of the benzene stripping system and a tail gas pipe 15 of the benzene distillation tower, so that benzene-containing tail gas is treated at the top of the tower in the processes of stripping, alkali washing, back-extraction, stripping and benzene distillation in the caprolactam refining process, and the pollution to the environment is reduced.
The above embodiment discloses a caprolactam refined tail gas treatment device and method, wherein during actual use, absorption liquid is sent into an amide oil storage tank 2 along an ammonium sulfate device 1, then the absorption liquid is sent into a tail gas absorption tower 4 from top to bottom through an amide oil delivery pump 3, tail gas is sent into the tail gas absorption tower 4 from bottom to top through a gas supply component, gas and liquid are fully mixed through a mixing component, the content of toxic substances benzene in the tail gas is greatly reduced, then the absorption liquid in the tail gas absorption tower 4 is sent into an extraction unit 7 through a tower kettle solution discharge pump 5, the treated tail gas enters a tail gas buffer tank 6, waste liquid remained in the tail gas buffer tank 6 enters a benzene residual liquid tank 99, the treated tail gas enters a tail gas separation tank 10 under the action of a tail gas extraction pump 8, and then the tail gas enters a factory area flare gallery 16 from the exhaust end of the tail gas separation tank 10, and the final pollution to the environment can be further reduced by the mode of reducing the benzene content in advance.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the disclosure, and it is intended to cover the scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a refined tail gas processing apparatus of caprolactam, includes amide oil storage tank (2) that are used for buffering the absorption liquid, amide oil storage tank (2) upper end is equipped with ammonium sulfate device (1) that are used for carrying the absorption liquid, the liquid outlet end of amide oil storage tank (2) communicates with the inlet end of amide oil delivery pump (3), tail gas absorption tower (4) that are used for absorbing tail gas are connected in amide oil delivery pump (3), the inlet end position of tail gas absorption tower (4) sets up in upper left side, a serial communication port, tail gas absorption tower (4) inside is equipped with the mixed part that is used for improving absorption liquid and tail gas contact effect, the air feed part that is used for carrying tail gas is connected in tail gas absorption tower (4) outside of mixed part below, tower cauldron solution discharge pump (5) are connected to the flowing back position of tail gas absorption tower (4) bottom, the liquid outlet end of tower cauldron solution discharge pump (5) is connected and is extracted unit (7), tail gas buffer tank (6) that are used for buffering are connected to the exhaust end at tail gas buffer tank (6), the bottom of tail gas buffer tank (6) is equipped with the benzene tank (99) that is used for carrying the residual liquid, exhaust end (8) are taken out end and are connected with exhaust pump (8), and the exhaust end of the tail gas separating tank (10) is connected with a factory flare pipe gallery (16) for burning and treating tail gas.
2. The caprolactam refining tail gas treatment device according to claim 1, characterized in that a movable door is arranged on the surface of the tail gas absorption tower (4) where the mixing component is positioned.
3. The caprolactam refining tail gas treatment device according to claim 1, wherein the mixing component comprises at least one rotary disk (20) rotatably arranged on the inner wall of the tail gas absorption tower (4), a plurality of mounting holes (29) are formed in the rotary disk (20), a slow flow structure is cooperatively arranged in each mounting hole (29), and the lower end of the rotary disk (20) is connected with a rotary piece for driving the rotary disk to rotate.
4. A caprolactam refining tail gas treatment device according to claim 3, characterized in that the rotating member comprises a water storage disc (27) arranged below the rotating disc (20), the middle position of the water storage disc (27) is connected with the middle position of the bottom of the rotating disc (20) through a central rod (26), a plurality of liquid discharge side pipes (28) are arranged outside the central rod (26), each liquid discharge side pipe (28) is arranged at an acute angle with the tangential plane of the water storage disc (27), and the projection of the mounting hole (29) falls on the water storage disc (27).
5. The caprolactam refining tail gas treatment device according to claim 3, wherein the slow flow structure comprises a charging frame (23) for filling porous blocks (22), the outer side of the charging frame (23) is slidably arranged with mounting holes (29), ventilation holes are distributed at the bottom of the charging frame (23), and a clamping ring (21) in pressing contact with the top of a rotating disc (20) is arranged at the upper end of the porous blocks (22).
6. The caprolactam refining tail gas treatment device according to claim 5, characterized in that the porous block (22) is a porous stone or stainless steel porous block.
7. A caprolactam refining tail gas treatment device according to claim 3, characterized in that the lower end of each mounting hole (29) is provided with a filter screen structure which forms a liquid film structure when liquid falls on it.
8. The caprolactam refining tail gas treatment device according to claim 1, characterized in that the side surface of the tail gas absorption tower (4) is provided with at least one side rod (24), and the upper side of the side rod (24) is provided with a scraping brush (24) contacted with the lower end surface of the rotating disc (20).
9. The caprolactam refining tail gas treatment device according to claim 1, characterized in that the gas supply means comprise a stripping tail gas pipe (11), a washing tower tail gas pipe (12), a stripping tail gas pipe (13), a benzene stripping system tail gas pipe (14) and a benzene distillation tower tail gas pipe (15), and throttle valves are arranged on the corresponding tail gas pipes.
10. A method of treating a caprolactam refining tail gas treating apparatus according to any one of claims 1 to 9, comprising the steps of:
step one: the absorption liquid is sent into an amide oil storage tank (2) along an ammonium sulfate device (1), then the absorption liquid is sent into a tail gas absorption tower (4) from top to bottom through an amide oil delivery pump (3), the tail gas is sent into the tail gas absorption tower (4) from bottom to top through a gas supply part, and the gas and the liquid are fully mixed through a mixing part, so that the content of toxic substances benzene in the tail gas is greatly reduced;
step two: then the absorption liquid in the tail gas absorption tower (4) is sent into the extraction unit (7) through the tower kettle solution discharge pump (5), the treated tail gas enters the tail gas buffer tank (6), the residual waste liquid in the tail gas buffer tank (6) can enter the benzene residual liquid tank (99), the treated tail gas enters the tail gas liquid separating tank (10) under the action of the tail gas extraction pump (8), and then the tail gas enters the factory flare pipe gallery (16) from the exhaust end of the tail gas liquid separating tank (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310178990.7A CN116099336A (en) | 2023-02-28 | 2023-02-28 | Caprolactam refining tail gas treatment device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310178990.7A CN116099336A (en) | 2023-02-28 | 2023-02-28 | Caprolactam refining tail gas treatment device and method |
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| Publication Number | Publication Date |
|---|---|
| CN116099336A true CN116099336A (en) | 2023-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310178990.7A Pending CN116099336A (en) | 2023-02-28 | 2023-02-28 | Caprolactam refining tail gas treatment device and method |
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| CN (1) | CN116099336A (en) |
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2023
- 2023-02-28 CN CN202310178990.7A patent/CN116099336A/en active Pending
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