A device for improving the recovery rate of acetaldehyde in a cod device and an operating method thereof

Abstract

The application discloses a device for improving acetaldehyde recovery rate of a COD device and an operation method thereof, relates to the technical field of acetaldehyde recovery, and specifically relates to a device for improving acetaldehyde recovery rate of a COD device. The device for improving acetaldehyde recovery rate of a COD device comprises a distillation tower, and a feeding pipe is fixedly installed on the left side of the distillation tower. The device for improving acetaldehyde recovery rate of a COD device and the operation method thereof are characterized in that, through cooperation between a connecting device, a filter plate, a feeding pipe and a distillation tower, the separation of a connecting block and a discharging pipe is realized by compression of springs and telescopic rods in the connecting device, the effect of dismounting and replacing the filter plate is achieved, meanwhile, the connection of the connecting block and the discharging pipe is realized by the rebound of the telescopic rods and the springs, the installation effect of the filter plate is achieved, the problem that the filter plate is not easy to clean is effectively solved, the adjustment of the connection mode of the filter plate is achieved by changing the position of the connecting block, the dismounting steps of the filter plate are simplified, and the practical flexibility of the filter plate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of acetaldehyde recovery, in particular to a device for improving the acetaldehyde recovery rate of a COD device and an operating method thereof. BACKGROUND

[0002] COD is the chemical oxygen demand, and the chemical oxygen demand (COD) discharge is the sum of the COD discharge in industrial wastewater and the COD discharge in domestic sewage. The chemical oxygen demand refers to the oxygen consumption when oxidizing organic pollutants in water with a chemical oxidant. The oxidizable substances in wastewater are oxidized and decomposed by using a chemical oxidant, and then the oxygen consumption is calculated according to the amount of residual oxidant to represent the content of organic matter in wastewater, reflecting the degree of organic pollution of water. The higher the COD value is, the more serious the organic pollution in water is. The source of organic pollution may be pesticides, chemical plants, organic fertilizers, etc. Many organic pollutants can be adsorbed and deposited by the bottom mud in the river bottom, causing persistent toxic effects on aquatic organisms in the future for several years. If people eat the organisms in water, they will absorb a large amount of toxins in the organisms, which often have the effects of carcinogenesis, teratogenesis and mutagenesis. Among them, the polyester esterification wastewater usually contains a small amount of organic matter such as ethylene glycol (EG), acetaldehyde, 2-methyl-1,3-dioxolane (2-MD) and the like.

[0003] However, the esterification process of polyester production produces a large amount of industrial wastewater with high organic matter content and complex composition. The main components include acetaldehyde, ethylene glycol (EG), 2-methyl-1,3-dioxolane (2-MD) and other heterocyclic compounds. Acetaldehyde in wastewater combines with ethylene glycol to form 2-MD, which is a reversible process and unstable. 2-MD is easily decomposed by heat. Therefore, if the temperature of the esterification wastewater is too high, the decomposition of 2-MD will be increased, the volatilization of acetaldehyde in the wastewater will be increased, and the acetaldehyde recovery efficiency of the COD device will be reduced. The volatilized acetaldehyde cannot be directly discharged and needs to enter the odor treatment system VOC of the device for treatment, which also increases the load of VOC and the energy consumption of the device. The wastewater contains impurities before entering the distillation column. The presence of impurities in the distillation column can cause the formation of scale in the distillation column and also cause the blockage of water pipes, which can damage the distillation column and water pipes and shorten the service life of the distillation column and water pipes. SUMMARY

[0004] The present application provides a device for improving the acetaldehyde recovery rate of a COD device and an operating method thereof, which solves the problems raised in the above background.

[0005] In order to achieve the above object, the present application is realized by the following technical scheme: a device for improving the acetaldehyde recovery rate of a COD device, comprising a distillation tower, a feed pipe is fixedly installed on the left side of the distillation tower, clamping blocks are fixedly installed on the front and back of the feed pipe, L-shaped rods are movably sleeved on the inner walls of the clamping blocks, a connecting device is arranged on one side of the L-shaped rods, and filter plates are fixedly connected to the ends of the L-shaped rods away from the clamping blocks and located inside the feed pipe.

[0006] A gas outlet pipe is fixedly connected to the upper end of the distillation tower, a steam pipe is fixedly connected to the right side of the distillation tower, a heating device is fixedly installed below the steam pipe on the right side of the distillation tower, and a discharge pipe is fixedly installed at the lower end of the distillation tower.

[0007] Optionally, a motor is fixedly installed on the back of the feed pipe, an anti-blocking device is fixedly connected to the output shaft of the motor and located on the right side of the filter plate, a cleaning brush is fixedly connected to one side of the anti-blocking device, and the cleaning brush is fixedly installed on the lower end surface of the feed pipe.

[0008] Optionally, a water pump is fixedly connected to the end of the feed pipe away from the distillation tower, a wastewater storage tank is fixedly connected to the left side of the water pump, and a condenser is fixedly connected to the end of the wastewater storage tank away from the water pump.

[0009] Optionally, the connecting device comprises a telescopic rod fixedly connected to the inner wall of the L-shaped rod, a spring is movably sleeved on the outer wall of the telescopic rod, a connecting block is connected to the end of the telescopic rod away from the L-shaped rod, and the outer wall of the connecting block is movably sleeved with the inner wall of one side of the clamping block.

[0010] Optionally, one end of the spring is fixedly connected to the inner wall of one side of the L-shaped rod, and the end of the spring away from the L-shaped rod is fixedly connected to one side of the inner wall of the connecting block.

[0011] Optionally, the anti-blocking device comprises a rotating rod fixedly connected to the output shaft of the motor, a movable block is movably sleeved on the outer wall of the rotating rod, and limiting rods are fixedly connected to the upper and lower sides of the movable block.

[0012] Optionally, threads are arranged on the inner wall of the movable block, the inner wall of the movable block is threadedly sleeved with the outer wall of the rotating rod, the outer wall of the rotating rod is provided with threads corresponding to the inner wall of the movable block, and the left side of the movable block is fixedly connected with the right side of the cleaning brush.

[0013] A device for improving the acetaldehyde recovery rate of a COD device and an operating method thereof, comprising the following operating steps:

[0014] S1, cooling of esterified wastewater

[0015] 1.3, turn on the power supply of the water pump, the water pump is started to drive the flow of esterification wastewater, the esterification wastewater flows to the inside of the condenser, and the esterification wastewater cooled by the condenser flows to the inside of the wastewater storage tank, then through the inside of the water pump and finally reaches the inside of the feed pipe;

[0016] S2, filtration of esterification wastewater

[0017] 2.1, the esterification wastewater flows to the inside of the feed pipe through the water pump, and the impurities in the wastewater fall in the inside of the waste pipe after being filtered by the filter plate, and the wastewater separated from the impurities flows to the inside of the distillation column;

[0018] 2.2, turn on the motor, the motor is turned on at the same time to drive the rotation of the rotating rod, at this time the rotating rod rotates around the circumference and cooperates with the limiting rod to limit the horizontal reciprocating motion of the movable block on the outer wall of the rotating rod, the movable block moves at the same time to drive the cleaning brush to dredge the pores of the filter plate, at this time the cleaning is carried out to the inside of the waste pipe which is stuck in the pores of the filter plate;

[0019] S3, recovery of acetaldehyde in esterification wastewater

[0020] 3.1, turn on the heating device, the heating device is turned on at the same time to realize the temperature rise in the inside of the distillation column, and the continuous temperature rise in the inside of the distillation column makes the esterification wastewater entering the inside of the distillation column produce water vapor, the water vapor is discharged from the gas outlet pipe to the outside of the distillation column after being produced, and the wastewater is stored at the bottom of the distillation column and continuously reacts under the action of high temperature, so that the acetaldehyde in the wastewater is continuously extracted and recovered;

[0021] S4, regular replacement of filter plate

[0022] 4.1, press the connecting block to move to the inside of the L-shaped rod, and the connecting block is separated from the clamping block when the connecting block is continuously pressed to move to the compression state of the telescopic rod and the spring, at this time the filter plate is pulled out;

[0023] 4.2, clean or replace the pulled-out filter plate, take the cleaned filter plate or new filter plate, press the connecting block to move to the inside of the L-shaped rod, and then insert the L-shaped rod into the inside of the clamping block, and the connecting block is pulled out from the inside of the clamping block by the rebound of the telescopic rod and the spring when the L-shaped rod continuously moves downward in the inside of the clamping block, at this time the position of the clamping block and the L-shaped rod is fixed, that is, the filter plate is installed.

[0024] The present application has the following advantages:

[0025] 1. This device and its operation method for improving the acetaldehyde recovery rate of a COD unit, through the cooperation between the connecting device, filter plate, feed pipe and distillation column, utilizes the compression of the spring and telescopic rod in the connecting device to achieve the separation of the connecting block and the discharge pipe, thus achieving the effect of disassembling and replacing the filter plate. At the same time, the rebound of the telescopic rod and spring achieves the connection of the connecting block and the discharge pipe, thus achieving the effect of installing the filter plate. This effectively solves the problem of the filter plate being difficult to clean. By changing the position of the connecting block, the connection method of the filter plate can be adjusted, simplifying the disassembly steps of the filter plate and improving the practical flexibility of the filter plate.

[0026] 2. The device and its operation method for improving the acetaldehyde recovery rate of COD unit, through the cooperation between the anti-clogging device, the discharge pipe, the distillation tower and the feed pipe, utilizes the circumferential rotation of the rotating rod in the anti-clogging device combined with the restriction of the limiting rod to realize the horizontal reciprocating motion of the moving block on the outer wall of the rotating rod. This achieves the cleaning effect of the cleaning brush on the pores of the filter plate, effectively solving the problem of filter plate clogging caused by impurities in the wastewater. The use of the cleaning brush to unclog the filter plate prevents impurities from clogging the filter plate and preventing wastewater from flowing into the interior of the distillation tower. While separating wastewater from impurities, it can also extend the service life of the filter plate.

[0027] 3. The device and its operation method for improving the acetaldehyde recovery rate of the COD unit, through the coordination between the distillation tower, water pump, condenser and wastewater storage tank, and by utilizing the installation of the condenser, achieves the purpose of reducing the temperature of the esterification wastewater in the esterification wastewater storage tank, effectively solving the problem of low acetaldehyde recovery rate. By adopting the cooling method, the decomposition of 2-MD in the wastewater can be minimized, promoting more acetaldehyde in the wastewater to combine with ethylene glycol to generate 2-MD, reducing the volatilization of acetaldehyde in the wastewater before it goes to the acetaldehyde recovery unit, and increasing the acetaldehyde recovery rate. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a side view of the filter plate in the structure of the present invention;

[0030] Figure 3 This is a rear view of the motor in the structure of the present invention;

[0031] Figure 4 This is a frontal sectional view of the feed pipe in the structure of the present invention;

[0032] Figure 5 This is a rear view of the connecting device in the structure of the present invention;

[0033] Figure 6 In the structure of this invention Figure 5 A magnified view of point A;

[0034] Figure 7 Flow chart for the production of esterified wastewater in the structure of the invention.

[0035] In the figure: 1, distillation column; 2, feed pipe; 3, clamping block; 4, L-shaped rod; 5, connecting device; 51, telescopic rod; 52, spring; 53, connecting block; 6, filter plate; 7, gas outlet pipe; 8, steam pipe; 9, heating device; 10, discharge pipe; 11, motor; 12, anti-blocking device; 121, rotating rod; 122, movable block; 123, limiting rod; 13, cleaning brush; 14, waste pipe; 15, water pump; 16, wastewater storage tank; 17, condenser. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] Please refer to Figure 1 The present application provides a technical solution: a device for improving the recovery rate of acetaldehyde in a COD device, which comprises a distillation column 1, a feed pipe 2 fixedly installed on the left side of the distillation column 1, clamping blocks 3 fixedly installed on the front and back of the feed pipe 2, L-shaped rods 4 movably sleeved on the inner walls of the clamping blocks 3, connecting devices 5 provided on one side of the L-shaped rods 4, which simplify the disassembly and assembly steps of the filter plates 6, thereby improving the flexibility of replacing and cleaning the filter plates 6, filter plates 6 fixedly connected to the ends of the L-shaped rods 4 away from the clamping blocks 3 and located inside the feed pipe 2, which separate impurities from water in esterified wastewater, avoid the formation of scale caused by impurities adhering to the inside of the distillation column 1, reduce the damage of scale to the distillation column 1, also avoid the blockage of water pipes caused by impurities, and prolong the service life of the water pipes, a gas outlet pipe 7 fixedly connected to the upper end of the distillation column 1, a steam pipe 8 fixedly connected to the right side of the distillation column 1, a heating device 9 fixedly installed below the steam pipe 8 on the right side of the distillation column 1, and a discharge pipe 10 fixedly installed at the lower end of the distillation column 1.

[0038] Please refer to Figures 2 to 7The back of the feeding pipe 2 is fixedly provided with a motor 11, the motor 11 is installed to provide power for the movement of the anti-blocking device 12, the output shaft of the motor 11 is fixedly connected with the anti-blocking device 12 located at the right side of the filter plate 6, one side of the anti-blocking device 12 is fixedly connected with a cleaning brush 13, the lower end surface of the feeding pipe 2 is fixedly provided with the cleaning brush 13, the movement of the cleaning brush 13 avoids the blockage of the gap of the filter plate 6, realizes the dredging effect of the filter plate 6, thereby prolongs the service life of the filter plate 6, the end of the feeding pipe 2 away from the distillation column 1 is fixedly connected with a water pump 15, the left side of the water pump 15 is fixedly connected with a wastewater storage tank 16, the end of the wastewater storage tank 16 away from the water pump 15 is fixedly connected with a condenser 17, the condenser 17 plays a role in cooling the esterification wastewater, so that the esterification wastewater in the wastewater storage tank 16 obtains a lower temperature, reduces the decomposition of 2-MD in the esterification wastewater, promotes more acetaldehyde to combine with ethylene glycol to generate 2-MD, reduces the volatilization of acetaldehyde therein, and thereby improves the acetaldehyde recovery rate.

[0039] Please refer to Figures 5 to 6 The connecting device 5 comprises a telescopic rod 51 fixedly connected with the inner wall of the L-shaped rod 4, the outer wall of the telescopic rod 51 movably sleeved with a spring 52, the end of the telescopic rod 51 away from the L-shaped rod 4 connected with a connecting block 53, and the outer wall of the connecting block 53 movably sleeved with the inner wall of one side of the clamping block 3, one end of the spring 52 fixedly connected with the inner wall of one side of the L-shaped rod 4, and the end of the spring 52 away from the L-shaped rod 4 fixedly connected with one side of the inner wall of the connecting block 53, the telescopic rod 51 and the spring 52 provide power for the movement and resetting of the connecting block 53, thereby realizing the installation and dismounting effect of the filter plate 6.

[0040] Please refer to Figure 3 and Figure 4 The anti-blocking device 12 comprises a rotating rod 121 fixedly connected with the output shaft of the motor 11, the outer wall of the rotating rod 121 movably sleeved with a movable block 122, the upper and lower sides of the movable block 122 fixedly connected with a limiting rod 123, the installation of the limiting rod 123 limits the movement track of the movable block 122, the inner wall of the movable block 122 is provided with a thread, the inner wall of the movable block 122 is threadedly sleeved with the outer wall of the rotating rod 121, and the outer wall of the rotating rod 121 is provided with a thread corresponding to the inner wall of the movable block 122, the threaded sleeving connection mode realizes the movement effect of the movable block 122 in the horizontal direction through the rotation of the rotating rod 121, and the left side of the movable block 122 is fixedly connected with the right side of the cleaning brush 13.

[0041] A device for improving the acetaldehyde recovery rate of a COD device and an operating method thereof, comprising the following operating steps:

[0042] S1, cooling of esterification wastewater

[0043] 1.4, turn on the power of the water pump 15, the water pump 15 is started to drive the flow of esterification wastewater, esterification wastewater flows to the inside of the condenser 17, after cooling in the condenser 17, the esterification wastewater flows to the inside of the wastewater storage tank 16, and then through the inside of the water pump 15 and finally reaches the inside of the feed pipe 2;

[0044] S2, filtration of esterification wastewater

[0045] 2.1, the esterification wastewater flows to the inside of the feed pipe 2 through the water pump 15, after filtration through the filter plate 6, the impurities in the wastewater fall into the inside of the waste pipe 14, and the wastewater separated from the impurities flows into the inside of the distillation column 1;

[0046] 2.2, turn on the motor 11, the motor 11 is turned on at the same time to drive the rotation of the rotating rod 121, at this time the rotating rod 121 rotates around the circumference and cooperates with the limiting rod 123 to limit the horizontal reciprocating motion of the movable block 122 on the outer wall of the rotating rod 121, the movable block 122 moves at the same time to drive the cleaning brush 13 to clear the pores of the filter plate 6, at this time the cleaning is swept into the inside of the waste pipe 14 which is stuck in the pores of the filter plate 6;

[0047] S3, recovery of acetaldehyde in esterification wastewater

[0048] 3.1, turn on the heating device 9, the heating device 9 is turned on at the same time to realize the temperature rise in the inside of the distillation column 1, and the continuous temperature rise in the inside of the distillation column 1 makes the esterification wastewater entering the inside of the distillation column 1 produce water vapor, the water vapor is discharged from the gas outlet pipe 7 to the outside of the distillation column 1 after being produced, and the wastewater is stored at the bottom of the distillation column 1 and continuously reacts under the action of high temperature, so that the acetaldehyde in the wastewater is continuously extracted and recovered;

[0049] S4, regular replacement of filter plate 6

[0050] 4.1, press the connecting block 53 to move into the inside of the L-shaped rod 4, and continuously press the connecting block 53 to make the telescopic rod 51 and the spring 52 in the compressed state, until the connecting block 53 is separated from the clamping block 3, at this time the filter plate 6 is pulled out;

[0051] 4.2, clean or replace the pulled-out filter plate 6, take the cleaned filter plate 6 or new filter plate 6, press the connecting block 53 to move into the inside of the L-shaped rod 4, and then insert the L-shaped rod 4 into the inside of the clamping block 3, with the continuous downward movement of the L-shaped rod 4 in the inside of the clamping block 3, the spring 52 and the telescopic rod 51 are used to drive the connecting block 53 to pop out from the inside of the clamping block 3, at this time the position of the clamping block 3 and the L-shaped rod 4 is fixed, that is, the installation of the filter plate 6 is completed.

[0052] In the description of the application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application; the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or equipment.

[0053] Although embodiments of the application have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the application, and the scope of the application is defined by the appended claims and their equivalents.

Claims

1. A device for increasing the recovery of acetaldehyde in a COD unit, comprising a distillation column (1), characterized in that: The left side of the distillation tower (1) is fixedly installed with a feeding pipe (2), the front and back surfaces of the feeding pipe (2) are fixedly installed with clamping blocks (3), the inner wall of the clamping block (3) is movably sleeved with an L-shaped rod (4), one side of the L-shaped rod (4) is provided with a connecting device (5), and the end, away from the clamping block (3), of the L-shaped rod (4) is fixedly connected with a filter plate (6) located inside the feeding pipe (2); The upper end of the distillation tower (1) is fixedly connected with an air outlet pipe (7), the right side of the distillation tower (1) is fixedly connected with a steam pipe (8), the right side of the distillation tower (1) is fixedly installed with a heating device (9) located below the steam pipe (8), and the lower end of the distillation tower (1) is fixedly installed with a discharge pipe (10); The connecting device (5) comprises a telescopic rod (51) fixedly connected with the inner wall of the L-shaped rod (4), the outer wall of the telescopic rod (51) is movably sleeved with a spring (52), and the end, away from the L-shaped rod (4), of the telescopic rod (51) is connected with a connecting block (53), and the outer wall of the connecting block (53) is movably sleeved with the inner wall of one side of the clamping block (3); The back surface of the feeding pipe (2) is fixedly installed with a motor (11), the output shaft of the motor (11) is fixedly connected with an anti-blocking device (12) located to the right of the filter plate (6), one side of the anti-blocking device (12) is fixedly connected with a cleaning brush (13), and the lower end surface of the feeding pipe (2) is fixedly installed with the cleaning brush (13); One end of the spring (52) is fixedly connected with the inner wall of one side of the L-shaped rod (4), and the end, away from the L-shaped rod (4), of the spring (52) is fixedly connected with one side of the inner wall of the connecting block (53).

2. The device for improving the acetaldehyde recovery rate of a COD device according to claim 1, characterized in that: The end, away from the distillation tower (1), of the feeding pipe (2) is fixedly connected with a water pump (15), the left side of the water pump (15) is fixedly connected with a wastewater storage tank (16), and the end, away from the water pump (15), of the wastewater storage tank (16) is fixedly connected with a condenser (17).

3. The device for improving the acetaldehyde recovery rate of a COD unit according to claim 1, characterized in that: The anti-blocking device (12) comprises a rotating rod (121) fixedly connected with the output shaft of the motor (11), the outer wall of the rotating rod (121) is movably sleeved with a movable block (122), and the upper and lower sides of the movable block (122) are fixedly connected with limiting rods (123).

4. The device for improving the acetaldehyde recovery rate of a COD device according to claim 3, characterized in that: The inner wall of the movable block (122) is provided with threads, the inner wall of the movable block (122) is threadedly sleeved with the outer wall of the rotating rod (121), and the outer wall of the rotating rod (121) is provided with threads corresponding to the inner wall of the movable block (122), and the left side of the movable block (122) is fixedly connected with the right side of the cleaning brush (13).

5. A method for operating an apparatus for increasing the recovery of acetaldehyde from a COD unit as claimed in any one of claims 1 to 4, characterized in that The operation steps include: S1, cooling of esterification wastewater 1.1, turn on the power supply of the water pump (15), the water pump (15) is started to drive the flow of esterification wastewater, the esterification wastewater flows into the inside of the condenser (17), the esterification wastewater cooled by the condenser (17) flows into the inside of the wastewater storage tank (16), and finally reaches the inside of the feeding pipe (2) through the inside of the water pump (15); 1.2, S2, filtering of esterification wastewater 2.1, the esterification wastewater flow through the water pump (15) to the inside of the feed pipe (2), after filtration of the filter plate (6), the impurities in the wastewater fall in the inside of the waste pipe (14), and the wastewater separated from the impurities flows into the inside of the distillation column (1); 2.2, open the motor (11), the motor (11) is opened at the same time driving the rotation of the rotating rod (121), at this time the rotating rod (121) rotates around the circumference while cooperating with the restriction of the limiting rod (123), so that the movable block (122) does horizontal reciprocating motion on the outer wall of the rotating rod (121), the movable block (122) moves at the same time driving the cleaning brush (13) to clear the gap of the filter plate (6), at this time the cleaning brush (13) is cleaned to the inside of the waste pipe (14) which is stuck in the gap of the filter plate (6); S3, recovery of acetaldehyde in esterification wastewater 3.1, open the heating device (9), the heating device (9) is opened at the same time to realize the temperature rise of the inside of the distillation column (1), and the continuous rise of the temperature in the inside of the distillation column (1) makes the esterification wastewater entering the inside of the distillation column (1) produce water vapor, the water vapor is discharged from the gas outlet pipe (7) to the outside of the distillation column (1) after being produced, and the wastewater is stored at the bottom of the distillation column (1) and continuously reacts under the action of high temperature, so that the acetaldehyde in the wastewater is continuously extracted and recycled; S4, regular replacement of filter plate (6) 4.1, press the connecting block (53) to move to the inside of the L-shaped rod (4), with the continuous pressing movement of the connecting block (53), the telescopic rod (51) and the spring (52) are in the compressed state, until the connecting block (53) is separated from the clamping block (3), at this time the filter plate (6) is pulled out; 4.2, clean or replace the pulled-out filter plate (6), take the cleaned filter plate (6) or new filter plate (6), press the connecting block (53) to move to the inside of the L-shaped rod (4), and then insert the L-shaped rod (4) into the inside of the clamping block (3), with the continuous downward movement of the L-shaped rod (4) in the inside of the clamping block (3), the rebound of the telescopic rod (51) and the spring (52) drives the connecting block (53) to pop out from the inside of the clamping block (3), at this time the position of the clamping block (3) and the L-shaped rod (4) is fixed, that is, the installation of the filter plate (6) is completed.

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