Method for extracting and purifying phenolic products from coal tar

Abstract

Belongs to the technical field of coal chemical phenol extraction. Crude phenol and dephenolized oil are obtained through one-tower double separation, the dephenolized oil and the carbolic oil are filtered through the filter screen plates on the vertical partition plates, the dephenolized oil is blocked in the extraction chamber, the carbolic oil is blocked in the acidification chamber, the dephenolized oil and the carbolic oil enter the corresponding oil grooves in a centralized mode after being filtered, and the system structure and the process steps are simpler. An electric telescopic cylinder, a connecting frame, a lifting plate and other parts are utilized in the extraction chamber and the acidification chamber to form a variable cavity, automatic separation operation is achieved, dephenolized oil in the extraction chamber is flushed through an extraction phase in the acidification chamber, meanwhile, the extraction phase is flushed and acidified through an extraction agent, generation of phenolic products in the extraction chamber is avoided, and the recovery rate of the phenolic products is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of phenol extraction from coal chemical industry, and specifically relates to a method for extracting and purifying phenol products from coal tar. Background Art

[0002] Coal tar, a major product of the coal chemical industry, is a complex organic mixture formed by cooling coal after dry distillation and gasification. Depending on the dry distillation temperature, coal tar is classified into low-temperature, medium-temperature, and high-temperature coal tar. Prioritizing the extraction of phenolic compounds from coal tar can, on the one hand, reduce hydrogen consumption during coal tar hydrogenation and extend catalyst life. On the other hand, it can increase the economic added value of coal tar products. Therefore, the extraction of phenolic compounds from coal tar is of great significance.

[0003] CN201710242204.X proposes a method for extracting phenolic compounds from coal tar or coal liquefaction oil by extraction, which mainly includes the following main processes or steps: ① Using an extractant to extract phenolic substances from the coal tar or coal liquefaction oil, the raffinate phase is dephenolized oil, and the extract phase is an extractant rich in phenolic substances; ② Using an acidifier to acidify the extract phase to obtain crude phenolic oil and an extractant rich in acidifier; ③ Under heating and / or reduced pressure conditions, the acidifier is removed and the extractant is regenerated. The regenerated extractant is recycled, and the removed acidifier can also be recycled; ④ Using conventional methods such as water extraction or distillation to recover the dephenolized oil and the small amount of extractant in the crude phenolic oil. The extraction and phenol extraction process requires two extraction towers, which leads to complex processes and high costs. However, there is no method for efficient single-tower extraction and phenol extraction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the existing traditional continuous multi-tower extraction phenol process has the problems of long process flow, complex process and high cost. The present invention adopts a one-tower dual separation method to efficiently complete the separation of the final dephenolized oil and the phenol oil in the distillate. At the same time, it also solves the problems of incomplete traditional separation, poor heat dissipation effect in the acidification process, low phenol product recovery rate, high phenol content in waste gas, long acidification time and low acidification efficiency.

[0005] In order to solve the above technical problems, the inventors have come up with the technical solution of the present invention through practice and summary. The present invention adopts the following technical solution:

[0006] The method for extracting and purifying phenolic products from coal tar comprises the following steps:

[0007] Step 1, dephenolization

[0008] The raw materials are sent to the dehydration equipment and preheating furnace in sequence through the raw material pipe and the delivery pump to complete dehydration and preheating. The preheated raw materials enter the primary distillation tower through the pipeline. The phenol oil vapor evaporated escapes from the top of the tower at 190-200℃. The bottom of the primary distillation tower is equipped with a circulation pipeline and a tubular heating furnace for heating the raw materials in the circulation pipeline.

[0009] Step 2, extraction

[0010] The extraction circulation loop includes an extractant tank, an acidifier tank, an extraction tower, a washing tower, a distillation tower, and a removal and regeneration tower;

[0011] The extraction tower is provided with an extractant filling pipe, a phenol oil filling pipe, and an acidifier filling pipe. A horizontal partition is provided in the extraction tower, a vertical partition is provided in the middle of the horizontal partition, and a filter screen is provided on the vertical partition. The vertical partition divides the extraction tower into an extraction chamber and an acidification chamber.

[0012] The phenol-containing oil vapor enters the extraction chamber through the condenser, and a set amount of extractant is added to the extraction chamber through the extractant filling pipe. The upper layer of dephenolized oil and the lower layer of phenol-containing extract are formed by sedimentation and stratification. The lower layer of phenol-containing extract passes through the filter plate and enters the acidification chamber. The upper layer of dephenolized oil is blocked by the filter plate and remains in the extraction chamber and is discharged into the distillation tower.

[0013] The acidulant filling pipe injects a set amount of acidulant into the acidulant chamber. After acidulant, the upper layer of crude phenol oil and the lower layer of acid-containing extract phase are separated and separated. The upper layer of crude phenol oil is blocked by the filter plate and remains in the acidulant chamber. It is then circulated and washed in the washing tower through the pipeline, and then separated into oil and water to obtain crude phenol oil. The lower layer of acid-containing extract phase returns through the filter plate and rinses the extraction chamber. It is discharged into the distillation tower and finally rinses the extraction chamber with the extractant filling pipe. The rinse liquid is discharged into the distillation tower.

[0014] Step 3, removal and regeneration

[0015] The upper dephenolized oil and the lower acid-containing extraction phase and the extractant mixture are separated in a fractionation tower to obtain dephenolized oil and a dephenolized oil residual phase. The dephenolized oil residual phase enters a removal and regeneration tower through a pipeline, where the acidifier is removed from the dephenolization and regeneration tower, and the acidifier and the regenerated extractant are collected. The acidifier enters an acidifier tank through a pipeline, and the extractant enters an extractant tank through a pipeline.

[0016] In order to solve the problem that the upper and lower layers in each chamber are separated by themselves to obtain the required products, and the upper and lower layers are not separated completely.

[0017] Preferably, the extraction chamber and the acidification chamber are both equipped with lifting plates, compensating sealing strips are respectively provided on both sides of the lifting plates, a connecting frame is installed on the lifting plates, an electric telescopic cylinder is installed on the top of the extraction tower, and the piston end of the electric telescopic cylinder extends into the extraction tower and is installed on the connecting frame.

[0018] Preferably, the compensating sealing strip includes a mounting part and a compensating part. The mounting part is mounted on both sides of the lifting plate, and the compensating part is arranged on the side of the mounting part facing away from the lifting plate and is always sealed and fitted with the vertical partition and the inner wall of the extraction tower. The mounting part and the compensating part are made of acid-resistant and wear-resistant materials.

[0019] Preferably, a tooth plate extending downward is provided on the inner top of the extraction tower, a gear is installed on the connecting frame, the tooth plate and the gear are meshed and matched, and the tooth plate is located on the side of the gear close to the vertical partition.

[0020] Preferably, the connecting frame includes an upper connecting portion and a lower connecting portion;

[0021] The upper connecting part is fixed to the end of the electric telescopic cylinder, and the lower connecting part is fixed to the lifting plate. The upper connecting part is provided with an arc groove, and a sliding pin is slidably fitted inside the arc groove, and flat springs are installed on both sides of the sliding pin.

[0022] The lower connecting part is rotatably mounted on the upper connecting part and the top is connected to the sliding pin. The gear is mounted on the rotation node of the lower connecting part and the upper connecting part.

[0023] In order to solve the problem of filter plate replacement.

[0024] Preferably, a clamping block is installed in the middle of the top surface of the horizontal partition, and a clamping groove that is sealed and adapted to the clamping block is provided at the bottom of the vertical partition;

[0025] A socket is provided on the top of the extraction tower for disassembling and assembling the vertical partition, and a limiting structure is installed on one side of the socket for fixing the vertical partition.

[0026] Preferably, a limiting hole is provided on the top of the vertical partition;

[0027] The limiting structure includes a horizontal groove arranged on the top of the extraction tower, a guide rod is installed in the horizontal groove, and a sliding plug rod is mounted on the guide rod;

[0028] The sliding plug rod and the limiting hole are interlaced and adapted to limit the vertical partition.

[0029] Preferably, a bellows is installed on the lifting plate, and the bellows is connected to a discharge pipe through a solenoid valve.

[0030] In order to solve the problems of heat dissipation in the acidification process to increase phenol products, reduce the phenol content in the waste gas, long acidification reaction time and low reaction efficiency.

[0031] Preferably, a U-shaped cooling pipe is sealed and slidably inserted on the lifting plate of the acidification chamber, and the U-shaped cooling pipe is installed on the horizontal partition. A circulating cooling water tank and a cooling water pump are installed at the bottom of the horizontal partition.

[0032] Preferably, a rotating plate is installed in the middle of the lifting plate of the acidifying chamber, and a plurality of acid adding nozzles are provided on the rotating plate, and the acid adding nozzles are all arranged obliquely and connected to the acidifying agent filling pipe;

[0033] A transmission gear ring is provided on the periphery of the bottom of the rotating plate, a driving motor is installed on the lifting plate, and a driving gear is installed on the output end of the driving motor. The driving gear is meshed with the transmission gear ring.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention adopts a double separation in one tower to obtain crude phenol and dephenolized oil, and utilizes the filter screen on the vertical partition to filter the dephenolized oil and phenol oil, so that the dephenolized oil is blocked in the extraction chamber and the phenol oil is blocked in the acidification chamber. After filtration, the crude phenol and the dephenolized oil are concentrated into their corresponding oil tanks, which makes the system structure and process steps simpler.

[0036] 2. The extraction chamber and the acidification chamber of the present invention utilize components such as an electric telescopic cylinder, a connecting frame, and a lifting plate to form a variable volume chamber, thereby achieving an autonomous separation operation. The extraction phase in the acidification chamber is utilized to flush the dephenolized oil in the extraction chamber. Simultaneously, the extraction agent is utilized to flush the acidified extraction phase, thereby preventing the formation of phenolic products in the extraction chamber and improving the recovery rate of the phenolic products.

[0037] 3. The lifting plate in the extraction chamber of the present invention adopts a torsion swing type, which causes a slight swing without affecting the sealing performance, making the oil-water separation more thorough and improving the recovery rate of phenol products.

[0038] 4. The use of a liquid acidulant in the acidification chamber of the present invention can avoid the problem of phenolic products blocking the acidification reaction during the acidification reaction when using a gaseous acidulant. In addition, the addition of the acidulant by a rotary spray from the bottom is conducive to efficient reaction. Secondly, the cooling effect achieved by the condenser is conducive to further improving the recovery rate of the phenolic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the process flow of the present invention.

[0040] Figure 2 This is a structural distribution diagram of the interior of the extraction tower of the present invention.

[0041] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0042] Figure 4 for Figure 2 A partial enlarged view of point B in the middle.

[0043] Figure 5 for Figure 2 A partial enlarged view of point C in the middle.

[0044] Figure 6 for Figure 2 A partial enlarged view of point D in the middle.

[0045] Figure 7 for Figure 6 Top view of the rotating plate.

[0046] Figure 8 This is a structural cross-sectional view of the compensating sealing strip. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0048] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0049] like Figure 1 As shown, the method for extracting and purifying phenolic products from coal tar comprises the following steps:

[0050] Step 1, dephenolization

[0051] The raw materials are fed into the dehydration equipment 20 and preheating furnace 30 in sequence through the raw material pipe 10 and the delivery pump to complete dehydration and preheating. The preheated raw materials enter the primary distillation tower 40 through the pipeline. The phenol oil vapor evaporated escapes from the top of the tower at 190-200°C. The bottom of the primary distillation tower 40 is equipped with a circulation pipeline and a tubular heating furnace 50 for heating the raw materials in the circulation pipeline.

[0052] Step 2, extraction

[0053] The extraction circulation loop includes an extractant tank 60, an acidifying agent tank 70, an extraction tower 80, a washing tower 90, a distillation tower 100, and a removal and regeneration tower 110;

[0054] The extraction tower 80 is provided with an extractant filling pipe 81, a phenol oil filling pipe 82, and an acidifier filling pipe 83. A horizontal partition 85 is provided in the extraction tower 80. A vertical partition 86 is provided in the middle of the horizontal partition 85. A filter screen 87 is provided on the vertical partition 86. The vertical partition 86 divides the extraction tower 80 into an extraction chamber and an acidification chamber.

[0055] The phenol-containing oil vapor enters the extraction chamber through the condenser, and the extractant filling pipe 81 adds a set amount of extractant into the extraction chamber, where it settles and separates into an upper layer of dephenolized oil and a lower layer of phenol-containing extract. The lower layer of phenol-containing extract passes through the filter plate 87 and enters the acidification chamber, while the upper layer of dephenolized oil is blocked by the filter plate 87 and remains in the extraction chamber and is discharged into the distillation tower 100.

[0056] The acidulant filling pipe 83 injects a set amount of acidulant into the acidulant chamber. After acidulant, the upper layer of crude phenol oil and the lower layer of acid-containing extract phase are separated. The upper layer of crude phenol oil is blocked by the filter plate 87 and remains in the acidulant chamber. It is then passed through the pipeline to the washing tower 90 for circulated washing and then separated into oil and water to obtain crude phenol oil. The lower layer of acid-containing extract phase returns through the filter plate 87 and rinses the extraction chamber, and is discharged into the distillation tower 100. The extraction chamber is finally rinsed by the extractant filling pipe 81, and the rinse liquid is discharged into the distillation tower 100.

[0057] Step 3, removal and regeneration

[0058] The dephenolized oil in the upper layer and the mixture of the acid-containing extract phase and the extractant in the lower layer are separated in the fractionation tower 100 to obtain dephenolized oil and a dephenolized oil residual phase. The dephenolized oil residual phase is passed through a pipeline to a removal and regeneration tower 110, where the acidifying agent is removed from the dephenolization and regeneration tower 110. The acidifying agent and the regenerated extractant are collected and passed through a pipeline to an acidifying tank 70, and the extractant is passed through a pipeline to an extractant tank 60.

[0059] like Figure 2 、 3 As shown, the extraction chamber and the acidification chamber use variable volume cavities to achieve self-oil separation.

[0060] The extraction chamber and the acidification chamber are both equipped with a lifting plate 84, and compensating sealing strips 841 are respectively provided on both sides of the lifting plate 84. A connecting frame 843 is installed on the lifting plate 84. An electric telescopic cylinder 842 is installed on the top of the extraction tower 80, and the piston end of the electric telescopic cylinder 842 extends into the extraction tower 80 and is installed on the connecting frame 843.

[0061] A downwardly extending tooth plate 844 is provided at the inner top of the extraction tower 80 , and a gear 845 is mounted on the connecting frame 843 . The tooth plate 844 and the gear 845 are meshed and matched. The tooth plate 844 is located on the side of the gear 845 close to the vertical partition 86 .

[0062] The connecting frame 843 includes an upper connecting portion 8431 and a lower connecting portion 8432 .

[0063] The upper connecting part 8431 is fixed to the end of the electric telescopic cylinder 842, and the lower connecting part 8432 is fixed to the lifting plate 84. The upper connecting part 8431 is provided with an arc groove, and a sliding pin 8433 is slidably fitted inside the arc groove, and flat springs are installed on both sides of the sliding pin 8433.

[0064] The lower connecting portion 8432 is rotatably mounted on the upper connecting portion 8431 and the top is connected to the sliding pin 8433 . The gear 845 is mounted on the rotation node between the lower connecting portion 8432 and the upper connecting portion 8431 .

[0065] The electric telescopic cylinder 842 drives the lifting plate 84 upward to achieve the effect of variable volume cavity, and the gear 845 and the tooth plate 844 are meshed and matched to achieve fine adjustment of the angle of the lifting plate 84, so as to achieve efficient separation.

[0066] like Figure 8 As shown, the compensating sealing strip 841 includes a mounting portion 8411 and a compensating portion 8412. The mounting portion 8411 is mounted on both sides of the lifting plate 84. The compensating portion 8412 is located on the side of the mounting portion 8411 facing away from the lifting plate 84 and is in constant sealing contact with the vertical partition 86 and the inner wall of the extraction column 80. The mounting portion 8411 and the compensating portion 8412 are made of acid-resistant and wear-resistant materials. The compensating portion 8412 compensates for the gap between the plates during deflection.

[0067] A bellows 8413 is installed on the lifting plate 84 , and the bellows 8413 is connected to a discharge pipe 8414 through a solenoid valve, one of which is connected to the crude phenol oil tank and the other is connected to the distillation tower 100 .

[0068] like Figure 2 、 4 , 5, in order to facilitate regular replacement of the filter plate.

[0069] A snap-in block 851 is installed in the middle of the top surface of the horizontal partition 85, and a snap-in groove 852 is provided at the bottom of the vertical partition 86 to seal and fit with the snap-in block 851;

[0070] A socket is provided on the top of the extraction tower 80 for disassembling and assembling the vertical partition 86 , and a limiting structure is installed on one side of the socket for fixing the vertical partition 86 .

[0071] A limiting hole is provided on the top of the vertical partition 86;

[0072] The limiting structure includes a horizontal groove 801 provided on the top of the extraction tower 80, a guide rod 802 is installed in the horizontal groove 801, and a sliding plug rod 803 is mounted on the guide rod 802;

[0073] The sliding plug rod 803 and the limiting hole are interlaced and adapted to limit the vertical partition 86.

[0074] like Figure 6 、 7 As shown, the acidification reaction is completed by using a liquid acidifying agent, thereby further improving the recovery rate of the phenolic product.

[0075] A U-shaped cooling pipe 8415 is sealed and slidably inserted into the lifting plate 84 of the acidification chamber. The U-shaped cooling pipe 8415 is installed on the horizontal partition 85. A circulating cooling water tank and a cooling water pump 8416 are installed at the bottom of the horizontal partition 85.

[0076] A rotating plate 8417 is installed in the middle of the lifting plate 84 of the acidifying chamber. A plurality of acid adding nozzles 8418 are provided on the rotating plate 8417. The acid adding nozzles 8418 are arranged obliquely and connected to the acidifying agent filling pipe 83 via a rotating joint.

[0077] A transmission gear ring is provided on the periphery of the bottom of the rotating plate 8417, a driving motor 8419 is installed on the lifting plate 84, and a driving gear is installed on the output end of the driving motor 8419, and the driving gear and the transmission gear ring are meshed and matched.

[0078] The U-shaped cooling tube 8415 is independent on the horizontal partition 85, which will not affect the interference problem of the acidification chamber cavity. The liquid acidifier at the bottom is rotated and sprayed to ensure efficient mixing to reduce the phenol content in the waste gas and further improve the recovery rate of phenol products.

[0079] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. The replacement may be a replacement of a portion of a structure, device, or method step, or it may be a complete technical solution. Any equivalent replacement or modification based on the technical solution and inventive concept of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A method for extracting and purifying phenolic products from coal tar, characterized in that: Here are the steps: Step 1, dephenolization The raw materials are sequentially sent to the dehydration equipment (20) and the preheating furnace (30) through the raw material pipe (10) and the delivery pump to complete dehydration and preheating. The preheated raw materials enter the primary distillation tower (40) through the pipeline, and the phenol oil-containing vapor evaporated escapes from the top of the tower at 190-200° C. The bottom of the primary distillation tower (40) is provided with a circulation pipeline and a tubular heating furnace (50) for heating the raw materials in the circulation pipeline; Step 2, Extraction An extraction circulation loop comprises an extractant tank (60), an acidulant tank (70), an extraction tower (80), a washing tower (90), a fractionation tower (100), and a removal and regeneration tower (110); The extraction tower (80) is provided with an extractant filling pipe (81), a phenol oil filling pipe (82), and an acidulant filling pipe (83); a horizontal partition (85) is provided in the extraction tower (80); a vertical partition (86) is provided in the middle of the horizontal partition (85); a filter screen plate (87) is provided on the vertical partition (86); and the vertical partition (86) divides the extraction tower (80) into an extraction chamber and an acidulant chamber; The phenol-containing oil vapor enters the extraction chamber through the condenser, and a set amount of extractant is added into the extraction chamber through the extractant filling pipe (81), and the upper layer of dephenolized oil and the lower layer of phenol-containing extract are formed by sedimentation and stratification. The lower layer of phenol-containing extract phase passes through the filter screen (87) and enters the acidification chamber. The upper layer of dephenolized oil is blocked by the filter screen (87) and remains in the extraction chamber and is discharged into the distillation tower (100); The acidulant filling pipe (83) fills a set amount of acidulant into the acidulant chamber, and after acidulant, the upper layer of crude phenol oil and the lower layer of acid-containing extraction phase are formed. The upper layer of crude phenol oil is blocked by the filter screen plate (87) and remains in the acidulant chamber, and enters the washing tower (90) through the pipeline for cyclic washing, and then undergoes oil-water separation to obtain crude phenol oil; the lower layer of acid-containing extraction phase returns through the filter screen plate (87) and rinses the extraction chamber, and is discharged into the fractionation tower (100) to cooperate with the extractant filling pipe (81) to finally rinse the extraction chamber, and the rinsing liquid is discharged into the fractionation tower (100); Step 3, removal and regeneration The dephenolized oil in the upper layer and the mixture of the acid-containing extraction phase and the extractant in the lower layer are separated in a fractionation tower (100) to obtain dephenolized oil and a dephenolized oil residual phase. The dephenolized oil residual phase enters a removal and regeneration tower (110) through a pipeline. The acidulant in the removal and regeneration tower (110) is removed, and the acidulant and the regenerated extractant are obtained by collecting. The acidulant enters an acidulant tank (70) through a pipeline, and the extractant enters an extractant tank (60) through a pipeline.

2. The method for extracting and purifying phenolic products from coal tar according to claim 1, characterized in that: A lifting plate (84) is installed in the extraction chamber and the acidification chamber, and compensating sealing strips (841) are respectively arranged on both sides of the lifting plate (84). A connecting frame (843) is installed on the lifting plate (84). An electric telescopic cylinder (842) is installed on the top of the extraction tower (80), and the piston end of the electric telescopic cylinder (842) extends into the extraction tower (80) and is installed on the connecting frame (843).

3. The method for extracting and purifying phenolic products from coal tar according to claim 2, characterized in that: A toothed plate (844) extending downward is provided at the inner top of the extraction tower (80), a gear (845) is installed on the connecting frame (843), the toothed plate (844) and the gear (845) are meshed and matched, and the toothed plate (844) is located on a side of the gear (845) close to the vertical partition (86).

4. The method for extracting and purifying phenolic products from coal tar according to claim 3, characterized in that: The connecting frame (843) includes an upper connecting portion (8431) and a lower connecting portion (8432); The upper connecting part (8431) is fixed to the end of the electric telescopic cylinder (842), and the lower connecting part (8432) is fixed to the lifting plate (84). The upper connecting part (8431) is provided with an arc groove, and a sliding pin (8433) is slidably matched inside the arc groove. Flat springs are installed on both sides of the sliding pin (8433). The lower connecting part (8432) is rotatably mounted on the upper connecting part (8431) and the top is connected to the sliding pin (8433), and the gear (845) is mounted on the rotation node of the lower connecting part (8432) and the upper connecting part (8431).

5. The method for extracting and purifying phenolic products from coal tar according to claim 4, characterized in that: A clamping block (851) is installed in the middle of the top surface of the horizontal partition (85), and a clamping groove (852) sealingly adapted to the clamping block (851) is provided at the bottom of the vertical partition (86); A socket is provided at the top of the extraction tower (80) for disassembling and assembling the vertical partition (86), and a limiting structure is installed on one side of the socket for fixing the vertical partition (86).

6. The method for extracting and purifying phenolic products from coal tar according to claim 5, characterized in that: A limiting hole is provided on the top of the vertical partition (86); The limiting structure comprises a horizontal groove (801) arranged on the top of the extraction tower (80), a guide rod (802) is installed in the horizontal groove (801), and a sliding plug rod (803) is sleeved on the guide rod (802); The sliding plug rod (803) and the limiting hole are interlaced and adapted to limit the vertical partition (86).

7. The method for extracting and purifying phenolic products from coal tar according to claim 6, characterized in that: The compensating sealing strip (841) comprises a mounting portion (8411) and a compensating portion (8412), wherein the mounting portion (8411) is mounted on both sides of the lifting plate (84), and the compensating portion (8412) is arranged on the side of the mounting portion (8411) facing away from the lifting plate (84) and is always in sealing contact with the vertical partition (86) and the inner wall of the extraction tower (80), and the mounting portion (8411) and the compensating portion (8412) are made of acid-resistant and wear-resistant materials.

8. The method for extracting and purifying phenolic products from coal tar according to claim 7, characterized in that: A bellows (8413) is installed on the lifting plate (84), and the bellows (8413) is connected to a discharge pipe (8414) via a solenoid valve.

9. The method for extracting and purifying phenolic products from coal tar according to claim 8, characterized in that: A U-shaped cooling pipe (8415) is sealed and slidably inserted on the lifting plate (84) of the acidification chamber. The U-shaped cooling pipe (8415) is installed on the horizontal partition (85). A circulating cooling water tank and a cooling water pump (8416) are installed at the bottom of the horizontal partition (85).

10. The method for extracting and purifying phenolic products from coal tar according to claim 9, characterized in that: A rotating plate (8417) is installed in the middle of the lifting plate (84) of the acidification chamber, and a plurality of acid adding nozzles (8418) are arranged on the rotating plate (8417). The acid adding nozzles (8418) are all arranged obliquely and connected to the acidifier filling pipe (83); A transmission gear ring is arranged at the bottom periphery of the rotating plate (8417), a driving motor (8419) is installed on the lifting plate (84), and a driving gear is installed at the output end of the driving motor (8419), and the driving gear and the transmission gear ring are meshed and matched.

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