Device and method for preparing dioctyl terephthalate using polyester waste

Abstract

The present invention discloses a device and method for preparing dioctyl terephthalate using polyester waste, relates to the technical field of dioctyl terephthalate preparation, and includes a conveying part, an extrusion part, a receiving part and a conveying part. Also disclosed is a method for preparing dioctyl terephthalate using polyester waste, which includes the following steps: adding materials, stirring materials, primary separation of materials and liquids, secondary separation of materials and liquids, tertiary separation of materials and liquids, and liquid collection. The present invention double-extrudes the materials through the conveying part and the extrusion part to increase the effect of liquid separation in the materials. After the double extrusion, the materials fall into the receiving part, and the receiving part extrude them again and discharges the extruded materials. During the movement of the receiving part, the second filter cartridge and the cleaning frame are driven, the cleaning frame cleans the first filter cartridge, and the second filter cartridge discharges the internal residue through the discharge port, thereby improving the flow effect of the liquid and increasing the product preparation efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of dioctyl terephthalate preparation, and in particular relates to a device and a method for preparing dioctyl terephthalate by utilizing polyester waste. Background Art

[0002] Polyester is widely used in many industries due to its durability, but as the product life cycle ends, the disposal of waste polyester becomes a challenge; natural degradation takes a long time, while incineration pollutes the environment; as a textile giant, China faces pressure to recycle a large amount of polyester waste; converting this waste into dioctyl terephthalate through a chemical process not only improves the recycling rate of resources, but also brings economic benefits to enterprises.

[0003] The patent with the publication number CN109879760B discloses a method for preparing dioctyl terephthalate by alcoholysis and esterification of polyester waste, which belongs to the technical field of polyester waste recycling and reuse. After the polyester waste is broken, it undergoes alcoholysis and esterification reaction with isooctyl alcohol under the action of a catalyst to generate dioctyl terephthalate and ethylene glycol. The alcohol extraction, neutralization and refining and adsorption and filtration processes are designed to improve the utilization rate of isooctyl alcohol and obtain high-quality dioctyl terephthalate and ethylene glycol products. Compared with the prior art, the beneficial effects are: 1) polyester waste is recycled and reused, and the generated dioctyl terephthalate is an environmentally friendly plasticizer; 2) the production process is energy-saving and efficient, the catalyst can be used multiple times, and the utilization rate of isooctyl alcohol is high; 3) the obtained product dioctyl terephthalate has high purity, and the by-product ethylene glycol also has economic value.

[0004] The above technical solution has the following problems:

[0005] 1. After long-term production experience accumulation, it is found that the above-mentioned filter press cannot squeeze the material containing liquid multiple times during use, resulting in incomplete separation of liquid and material.

[0006] 2. The material residue in the filter cannot be cleaned in time, causing the filter holes in the filter to be blocked by the material residue, affecting the liquid filtration efficiency.

[0007] Therefore, it is necessary to invent a device and method for preparing dioctyl terephthalate using polyester waste to solve the above problems. Summary of the invention

[0008] The purpose of the present invention is to provide a device and method for preparing dioctyl terephthalate using polyester waste in view of the above-mentioned technical problems, so as to solve the problems raised in the above-mentioned background technology.

[0009] The present invention provides a device and method for preparing dioctyl terephthalate by using polyester waste, comprising a filter press, one end of the filter press is connected to a first pipeline, the other end of the first pipeline is connected to a filter kettle, one end of the filter kettle is connected to a second pipeline, and the other end of the second pipeline is connected to a neutralization kettle, a partition plate is fixedly arranged inside the filter press, and the partition plate divides the inside of the filter press into a working chamber and a material receiving chamber;

[0010] A conveying part, which includes a screw conveying paddle, and the screw conveying paddle is rotatably arranged in the working chamber, and the conveying part can squeeze the material and separate the liquid in the material; an extrusion part, which includes a discharge filter cylinder, and the discharge filter cylinder is fixedly arranged at one end of the conveying part, and the extrusion part can squeeze the material again through the conveying part after being blocked; a material receiving part, which includes a material receiving box and an electric telescopic part, and the material receiving box is slidably arranged in the middle of the partition plate, and the electric telescopic part is fixedly arranged between the partition plate and the material receiving chamber, and the material receiving part can collect the material and squeeze the material again; an auxiliary part, which includes a first piston cylinder, and the first piston cylinder is fixedly arranged in the material receiving chamber, and the material receiving part can drive the auxiliary part to transport gas and discharge liquid during movement, and the first piston cylinder is internally sealed and slidably provided with a first piston rod, and the other end of the first piston rod is fixedly arranged at one end of the material receiving box, and the interior of the first piston cylinder is divided into a fluid chamber and a gas chamber by one end of the first piston rod, and the fluid chamber is used to discharge liquid, and the gas chamber is used to store gas.

[0011] Preferably, a driving motor is fixedly provided at one end of the spiral conveying paddle, and the driving motor is fixedly provided at one end of the filter press, a first filter cartridge is fixedly provided inside the working chamber, a second filter cartridge is slidably provided inside the working chamber, the spiral conveying paddle is placed in the first filter cartridge, and the first filter cartridge is placed in the second filter cartridge, a discharge port is provided at one end of the second filter cartridge near the extrusion portion, a filter screen is provided below the second filter cartridge, and the filter screen is fixedly provided inside the partition plate.

[0012] Preferably, a cleaning frame is fixedly disposed inside the second filter cartridge, and the second filter cartridge can drive the cleaning frame when moving, so that the cleaning frame cleans the first filter cartridge during the movement.

[0013] Preferably, the discharge filter cartridge is fixedly arranged at one end of the first filter cartridge, and a sealing plate is slidably arranged at one end of the second filter cartridge, and the sealing plate is used to seal the discharge filter cartridge.

[0014] Preferably, a filter plate is slidably provided at the bottom of the material receiving box, and an inclined groove is provided inside the filter plate. The bottom of the inclined groove is connected to a connecting pipe, and the other end of the connecting pipe is connected to a liquid storage tank provided in the middle of the partition plate.

[0015] Preferably, a protrusion is fixedly provided on the top of one end of the filter plate located in the working chamber, and the upper end of the protrusion is provided with an arc surface, a plurality of tension springs are provided between the material receiving box and the protrusion, an elastic sheet is fixedly provided inside the partition plate, and a plurality of blocking balls are fixedly provided at the lower end of the elastic sheet, and the elastic sheet and the blocking balls are used to limit the protrusion.

[0016] Preferably, a fixing plate is fixedly provided at the upper end of the material receiving box, an extension rod is fixedly provided at one end of the blocking plate, and an extrusion spring is sleeved on the outer side of the extension rod, and the upper end of the fixing plate is slidably connected to the extension rod.

[0017] Preferably, a second piston cylinder is fixedly arranged in the material receiving chamber, and a second piston rod is sealingly and slidably arranged inside the second piston cylinder, one end of the fluid chamber is connected with a fluid tube, and the fluid tube is connected with the liquid storage tank, the other end of the fluid chamber is connected with a drain pipe, and the other end of the drain pipe passes through the partition plate to the second filter cylinder, and an airflow tube is connected between the gas chamber and the second piston cylinder.

[0018] Preferably, a liquid collecting tank is provided inside the working chamber, the bottom of the liquid collecting tank is connected to a liquid drain pipe, and the liquid drain pipe passes through the liquid collecting tank and the filter press and extends out of the outer wall of the filter press.

[0019] The present invention also discloses a method for preparing dioctyl terephthalate by using polyester waste, comprising the following steps:

[0020] Step 1, adding materials: introducing the crude product after alcohol extraction into the neutralization kettle, adding alkali solution into the neutralization kettle, stirring and mixing to cause neutralization reaction;

[0021] Step 2: Material stirring: the reacted material enters the filter kettle through the second pipeline, a certain amount of activated carbon is added and stirred for a period of time;

[0022] Step 3: Separate the material from the liquid once: pump the material in the filter kettle into the filter press through the filter pump and the first pipeline, and start the conveying part to separate the liquid and the material;

[0023] Step 4: Secondary separation of material and liquid: After the material and liquid are separated by the conveying part, the material is conveyed to the extrusion part for secondary extrusion to increase the separation effect of the material and liquid;

[0024] Step 5: Separate the material and liquid three times: After the extrusion part is completed, the material falls to the top of the filter plate, and the material residue in the second filter cartridge also falls to the top of the filter plate. The material receiving box and the electric telescopic part cooperate to squeeze the material three times to strengthen the separation of the material and the liquid.

[0025] Step 6, liquid collection: The separated liquid is filtered layer by layer through the first filter cartridge, the second filter cartridge and the filter screen. After the liquid is filtered, it enters the product tank through the cooler to finally obtain the dioctyl terephthalate product.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention cooperates with the components such as the discharge filter cartridge, the blocking plate, the fixing plate, the extension rod, the material receiving box and the filter plate. When the material receiving box moves from the initial position to the first position, a certain gap is generated between the material receiving box and the filter plate, and the gap is used to clean the material. When the material receiving box moves to the second position, the filter plate and the material receiving box are tightly fitted under the action of the tension spring, and the gap is closed. The material in the discharge filter cartridge falls to the top of the filter plate. When the material receiving box, the filter plate and the blocking plate move to the third position, the blocking plate drives the second filter cartridge during the movement, so that the material residue in the second filter cartridge is discharged from the discharge port The material is discharged from the inner part to avoid the material residue blocking the filter holes in the second filter cartridge and affecting the filtering effect, thereby improving the flow effect of the liquid; when the material collecting box moves from the third position to the initial position, the material collecting box pushes the material to be squeezed on one end of the partition plate, and the material is squeezed again by the material collecting box to strengthen the separation of the material and the liquid, thereby improving the separation effect of the material and the liquid; at the same time, the sealing plate cooperates with the material collecting box, the fixed plate, the extension rod and the extrusion spring to seal the discharge filter cartridge, so that the material in the discharge filter cartridge is squeezed again, thereby improving the separation effect of the material and the liquid.

[0028] 2. In the present invention, the material receiving part drives the sealing plate in the extrusion part to move through the cooperation of the material receiving part, the second filter cartridge, the cleaning frame and other components, so that the sealing plate drives the second filter cartridge to move away from or close to the material receiving chamber. During the movement, the second filter cartridge drives the cleaning frame to intermittently reciprocately clean the filter holes in the first filter cartridge, so as to prevent material residues from blocking the filter holes and affecting the outflow of the liquid, thereby improving the flow effect of the liquid.

[0029] 3. The present invention controls the movement of the material receiving box through the cooperation of the first piston cylinder, the first piston rod, the second piston cylinder and the second piston rod, etc., through the electric telescopic part. The material receiving box pushes the first piston rod during the movement, and the first piston rod draws back or fills the gas in the second piston cylinder through the air flow pipe to control the movement of the second piston rod, and then squeezes the sealing plate through the second piston rod to prevent the material from leaking out due to the poor sealing effect of the sealing plate on the discharge filter cylinder when the material is squeezed in the discharge filter cylinder. The cooperation of the second piston rod and the extrusion spring further enhances the sealing effect of the sealing plate on the discharge filter cylinder.

[0030] 4. The present invention cooperates with the first piston cylinder, the first piston rod, the fluid chamber and the liquid storage tank, and moves toward the working chamber through the material receiving box. The first piston rod draws the liquid in the liquid storage tank into the fluid chamber through the fluid tube. When the material receiving box moves away from the working chamber, the material receiving box drives the first piston rod to squeeze the liquid in the fluid chamber. The squeezed liquid is discharged into the second filter cylinder through the drain pipe and filtered downward layer by layer, thereby further improving the filtering effect of the liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the coordination structure of the conveying part and the extrusion part of the present invention;

[0033] Figure 3 It is a schematic diagram of the cooperation between the partition plate and the conveying part of the present invention;

[0034] Figure 4 It is a schematic diagram of the cross-sectional structure of the filter press of the present invention;

[0035] Figure 5 It is a schematic structural diagram of the material receiving part and the conveying part of the present invention;

[0036] Figure 6 The present invention Figure 5 The enlarged structural diagram at A in the middle;

[0037] Figure 7 The present invention Figure 5 The enlarged structural diagram at B in the middle;

[0038] Figure 8 It is a schematic diagram of the structure of the conveying part of the present invention;

[0039] Fig. 9 It is a schematic diagram of the first position structure of the material receiving part of the present invention;

[0040] Fig.10 It is a schematic diagram of the second position structure of the material receiving part of the present invention;

[0041] Fig.11 It is a schematic structural diagram of the third position of the material receiving part of the present invention.

[0042] In the figure: 1, filter press; 2, first pipeline; 3, filter kettle; 4, second pipeline; 5, neutralization kettle; 6, partition plate; 7, working chamber; 8, material receiving chamber; 9, conveying part; 10, extrusion part; 11, material receiving part; 12, auxiliary part; 13, liquid collecting tank; 14, liquid discharge pipe; 901, screw conveyor paddle; 902, drive motor; 903, first filter cartridge; 904, second filter cartridge; 905, filter screen; 906, cleaning rack; 907, discharge port; 101, discharge filter cartridge; 102, blocking plate; 111, material receiving box; 112 , electric telescopic member; 113, filter plate; 114, inclined groove; 115, connecting pipe; 116, liquid storage tank; 117, bump; 118, tension spring; 119, elastic sheet; 120, blocking ball; 121, fixing plate; 122, extension rod; 123, extrusion spring; 1201, first piston cylinder; 1202, first piston rod; 1203, fluid chamber; 1204, gas chamber; 1205, second piston cylinder; 1206, second piston rod; 1207, fluid tube; 1208, air flow tube; 1209, drain pipe. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0044] The present invention provides Figures 1 to 11The device for preparing dioctyl terephthalate from polyester waste shown in the figure includes a filter press 1. One end of the filter press 1 is connected to a first pipeline 2, and the other end of the first pipeline 2 is connected to a filtration kettle 3. One end of the filtration kettle 3 is connected to a second pipeline 4, and the other end of the second pipeline 4 is connected to a neutralization kettle 5. Among them, the neutralization kettle 5 and the filtration kettle 3 are both prior arts and will not be elaborated here. A partition plate 6 is fixedly arranged inside the filter press 1. The partition plate 6 is composed of a sealing plate and two blocking plates. Both ends of the sealing plate are fixedly provided with blocking plates. After the sealing plate and the two blocking plates are combined, they form a "C" - shaped structure. At the mutually - remote ends of the two blocking plates, there are serpentine oil - guiding pipes. The two oil - guiding pipes are interconnected. One end is the oil inlet, and the other end is the oil outlet. By adding heat - conducting oil into the oil - guiding pipes and using a circulation pump to circulate the heat - conducting oil, the inside of the working cavity 7 is heated, so that the liquid inside the working cavity 7 flows faster. This is a prior art and will not be elaborated too much here. And the partition plate 6 divides the interior of the filter press 1 into a working cavity 7 and a material - receiving cavity 8. The working cavity 7 is used for separating the liquid in the material, while the material - receiving cavity 8 is used for collecting the material separated from the liquid. Inside the working cavity 7, there is a liquid - receiving tank 13. The liquid - receiving tank 13 is in an inverted - triangle structure. The bottom of the liquid - receiving tank 13 is connected to a liquid - discharging pipe 14. And the liquid - discharging pipe 14 penetrates through the liquid - receiving tank 13 and the filter press 1 and extends out of the outer wall of the filter press 1. One end of the liquid - discharging pipe 14 extending out of the filter press 1 is also connected to a cooler (not shown in the figure), and the other end of the cooler is connected to a finished - product tank (not shown in the figure) through a pipeline.

[0045] After the reaction of the crude product after alcohol extraction is completed in the neutralization kettle 5, it is introduced into the filtration kettle 3 through the second pipeline 4. After adding activated carbon and stirring for a period of time in the filtration kettle 3, it is introduced into the filter press 1 through a filtration pump and the first pipeline 2. Then, the heat - conducting oil circulates in the oil - guiding pipes to raise the temperature in the working cavity 7 to the specified temperature, heating the liquid separated by the conveying part 9, the extrusion part 10 and the material - receiving part 11, increasing the flow rate of the liquid. The separated liquid is filtered layer by layer through the first filter cylinder 903, the second filter cylinder 904 and the filter screen 905. The filtered liquid flows into the liquid - receiving tank 13 and is discharged into the cooler through the liquid - discharging pipe 14, and then flows into the finished - product tank after being cooled by the cooler to obtain the product.

[0046] It should be noted that the liquid in this product has a low viscosity and poor fluidity. After heating, the fluidity of this liquid is strong, which is convenient for improving the filtration speed and efficiency of the liquid.

[0047] The conveying part 9 includes a spiral conveyor paddle 901, and the spiral conveyor paddle 901 is rotatably arranged in the working cavity 7. The spiral conveyor paddle 901 is arranged in a conical structure. The conveying part 9 can extrude the material and separate the liquid in the material.

[0048] A driving motor 902 is fixedly provided at one end of the screw conveying paddle 901, and the driving motor 902 is electrically connected to the control system, and the driving motor 902 is fixedly provided at one end of the filter press 1; a first filter cartridge 903 is fixedly provided inside the working chamber 7, and one end of the first pipeline 2 away from the filter kettle 3 is connected to the first filter cartridge 903, and the screw conveying paddle 901 is placed in the first filter cartridge 903, and the first filter cartridge 903 is set to a conical structure, and the inner wall of the first filter cartridge 903 is in contact with the outer edge of the propeller blade of the screw conveying paddle 901. When the material enters the first filter cartridge 903, the screw conveying paddle 901 is driven by the driving motor 902 to operate, and the screw conveying paddle 901 conveys the material to move. As the diameter of the first filter cartridge 903 gradually decreases, the material is subjected to an increasingly greater extrusion force in the axial direction, so that the materials are squeezed against each other, and the liquid in the material is squeezed out; the working chamber A second filter cartridge 904 is slidingly arranged inside 7, and the first filter cartridge 903 is placed in the second filter cartridge 904, and a discharge port 907 is opened at one end of the second filter cartridge 904 near the extrusion portion 10; an annular groove is provided at one end of the working chamber 7 near the drive motor 902, and a limiting groove is provided inside the annular groove, and a limiting block is provided at one end of the second filter cartridge 904 near the drive motor 902, and the second filter cartridge 904 slides axially along the annular groove through the cooperation of the limiting groove and the limiting block; the other end of the second filter cartridge 904 slides in the circular hole opened in the middle of the partition plate 6, when the second filter cartridge 904 and the discharge port 907 are in the initial position, the thickness of the circular hole can block the discharge port 907, and when the second filter cartridge 904 drives the discharge port 907 to be in the third position, the discharge port 907 is staggered with the circular hole, so as to facilitate the discharge of material residues in the second filter cartridge 904.

[0049] The end with a larger diameter of the first filter cartridge 903 and the end with a smaller diameter of the second filter cartridge 904 are located on the same side, and the diameter of the end of the first filter cartridge 903 close to the extrusion portion 10 is smaller than the diameter of the other end, and the diameter of the end of the second filter cartridge 904 close to the extrusion portion 10 is larger than the diameter of the other end. During the movement of the second filter cartridge 904, the internal material residue moves toward the extrusion portion 10 due to its own gravity and the influence of the inclined surface and is discharged from the discharge port 907. A filter screen 905 is provided at the bottom of the second filter cartridge 904, and the filter screen 905 is fixedly arranged inside the working chamber 7. The filter screen 905 is arranged to have a triangular structure, so that the material residue rolls to both ends during the falling process to avoid clogging the middle of the filter screen 905.

[0050] A cleaning frame 906 is fixedly installed inside the second filter cartridge 904, and bristles are arranged on the inner wall of the cleaning frame 906. The length of the bristles is consistent with the inclined surface of the first filter cartridge 903, and the arrangement of the bristles is staggered with the filter holes in the first filter cartridge 903, which will not affect the outflow of liquid; the cleaning frame 906 is placed on the outer wall of the first filter cartridge 903, and the second filter cartridge 904 can drive the cleaning frame 906 when moving, so that the cleaning frame 906 cleans the first filter cartridge 903 during the movement.

[0051] The extrusion part 10 includes a discharge filter cartridge 101, and the discharge filter cartridge 101 is fixedly arranged at one end of the conveying part 9. After the extrusion part 10 is blocked, the material can be squeezed again through the conveying part 9. The discharge filter cartridge 101 is fixedly arranged at one end of the first filter cartridge 903. The lower end of the discharge filter cartridge 101 is provided with a filter hole to facilitate the discharge of the liquid generated by the squeezed material. A sealing plate 102 is slidably arranged at one end of the second filter cartridge 904. A limit block is arranged at the upper end of the sealing plate 102. A limit groove is arranged at one end of the second filter cartridge 904. Through the cooperation of the limit block and the limit groove, the sealing plate 102 can slide axially along one end of the second filter cartridge 904. The sealing plate 102 is used to seal the discharge filter cartridge 101.

[0052] The material receiving part 11 includes a material receiving box 111 and an electric telescopic part 112. The electric telescopic part 112 is electrically connected to the control system, and the material receiving box 111 is slidably arranged in the middle of the partition plate 6, and the electric telescopic part 112 is fixedly arranged on the side wall of the material receiving cavity 8. The material receiving box 111 is located on one side of the material receiving cavity 8 and is fixedly connected to the movable end of the electric telescopic part 112. The material receiving part 11 can collect materials and extrude the materials again.

[0053] A filter plate 113 is slidably provided at the bottom of the material receiving box 111, a limiting groove is provided on the inner wall of the material receiving box 111, and a limiting block is provided on the outer wall of the filter plate 113. When the material receiving box 111 moves to the first position, the limiting groove on the material receiving box 111 slides along the limiting block on the outer wall of the filter plate 113. When the material receiving box 111 moves to the second position, the limiting groove provided on its inner wall drives the limiting block and the filter plate 113 to move; the filter plate 113 slides between the material receiving chamber 8 and the working chamber 7, and the filter hole provided on the upper end of the filter plate 113 is located in the material receiving chamber 8. When the liquid in the second filter cartridge 904 in the working chamber 7 flows into the filter plate 113, due to the sealing sliding arrangement between the top of the filter plate 113 and the partition plate 6 , the liquid will not flow into the filter plate 113 in the material receiving chamber 8, and therefore will not enter the liquid storage tank 116 through the filter holes on the filter plate 113, thereby preventing the liquid flowing out of the second filter cartridge 904 from filling the liquid storage tank 116, and preventing the liquid generated by the squeezing of the material receiving box 111 from being unable to enter the liquid storage tank 116 through the filter holes on the filter plate 113; the filter plate 113 can move back and forth to discharge the liquid above the filter plate 113 in the working chamber 7 through the hole set at the lower end of the protrusion 117, and the filter plate 113 is provided with an inclined groove 114 inside, and the bottom of the inclined groove 114 is connected to a connecting pipe 115, and the other end of the connecting pipe 115 is connected to the liquid storage tank 116 opened in the middle of the partition plate 6.

[0054] A protrusion 117 is fixedly provided on the top of one end of the filter plate 113 located in the working chamber 7, and an arc-shaped surface is provided at the upper end of the protrusion 117. A plurality of tension springs 118 are provided between the material receiving box 111 and the protrusion 117. Pins are provided at both ends of the material receiving box 111, and pins are also provided at both ends of the protrusion 117. The two ends of the tension spring 118 are hooked on the outer surface of the corresponding pins. An elastic sheet 119 is fixedly provided inside the partition plate 6, and a plurality of blocking balls 120 are fixedly provided at the lower end of the elastic sheet 119. The elastic sheet 119 and the blocking balls 120 are used to limit the protrusion 117.

[0055] A fixing plate 121 is fixedly provided on the upper end of the material receiving box 111, an extension rod 122 is fixedly provided on one end of the blocking plate 102, a limiting plate is provided on the end of the extension rod 122 away from the blocking plate 102 to prevent the fixing plate 121 from separating from the extension rod 122 during the sliding process, and an extrusion spring 123 is sleeved on the outer side of the extension rod 122, and the upper end of the fixing plate 121 is slidably connected to the extension rod 122.

[0056] The auxiliary part 12 includes a first piston cylinder 1201, and the first piston cylinder 1201 is fixedly arranged in the material receiving chamber 8. The material receiving part 11 can drive the auxiliary part 12 to transport gas and discharge liquid during movement.

[0057] The first piston cylinder 1201 is internally sealed and slidably provided with a first piston rod 1202, and the other end of the first piston rod 1202 is fixedly provided at one end of the material receiving box 111, and the interior of the first piston cylinder 1201 is divided into a fluid chamber 1203 and a gas chamber 1204 by one end of the first piston rod 1202, the fluid chamber 1203 is used to discharge liquid, and the gas chamber 1204 is used to store gas; a second piston cylinder 1205 is fixedly provided in the material receiving chamber 8, and a second piston rod 1206 is internally sealed and slidably provided with the second piston cylinder 1205, one end of the fluid chamber 1203 is connected to a fluid tube 1207, and the fluid tube 1207 is connected to the liquid storage tank 116, and a first one-way valve is provided at the upper end of the fluid tube 1207, the first one-way valve can only control the extraction of liquid into the fluid chamber 1203, and the first one-way valve is closed when discharging liquid from the fluid chamber 1203 to the outside. The other end of the fluid cavity 1203 is connected to a drain pipe 1209. A second one-way valve is provided at one end of the drain pipe 1209 close to the fluid cavity 1203. The second one-way valve can only control the discharge of liquid. When liquid is extracted from the outside into the fluid cavity 1203, the one-way valve is closed. The other end of the drain pipe 1209 passes through the partition plate 6 to the second filter cylinder 904. An airflow pipe 1208 is connected between the gas cavity 1204 and the second piston cylinder 1205.

[0058] During operation, when the material enters the first filter cartridge 903, the material is squeezed with the cooperation of the screw conveying paddle 901 and the first filter cartridge 903, and the liquid in the squeezed material is discharged through the first filter cartridge 903. The squeezed material is transported to the discharge filter cartridge 101 as the screw conveying paddle 901 continues to work. At this time, the blocking plate 102 is in a state of blocking the discharge filter cartridge 101. When the discharge filter cartridge 101 is filled with material, the screw conveying paddle 901 continues to transport material into the discharge filter cartridge 101. At this time, the mutual extrusion pressure between the materials accumulated at the discharge filter cartridge 101 is further increased, forming a secondary extrusion effect. The liquid generated after the material is squeezed is discharged from the filter holes of the discharge filter cartridge 101 into the second filter cartridge 904. By setting the discharge filter cartridge 101, the material is further squeezed, thereby improving the separation effect of the material and the liquid. The liquid separated by squeezing is filtered layer by layer through the first filter cartridge 903, the second filter cartridge 904 and the filter screen 905, and then flows into the liquid collecting tank 13 and is discharged into the cooler through the drain pipe 14, and then enters the finished product tank through the cooler, thereby forming the final product.

[0059] When the material in the discharge filter cartridge 101 is squeezed again, the electric telescopic member 112 drives the material receiving box 111 to move from the initial position to a direction away from the first filter cartridge 903 until it moves to the first position. Fig. 9As shown, the tension spring 118 is stretched, at this time the filter plate 113 and the protrusion 117 are still in a stuck state, the material receiving box 111 slides along the filter plate 113 and a certain gap is generated between the filter plate 113 and the filter plate 113, and the gap is the maximum distance that the material receiving box 111 and the filter plate 113 can slide relative to each other. When the gap is opened, the squeezed material on the top of the filter plate 113 in the material receiving chamber 8 falls into the material receiving chamber 8 through the gap; at the same time, the material receiving box 111 also drives the fixed plate 121 to move, and the fixed plate 121 slides along the extension rod 122 during the movement, and its squeezing force on the squeezing spring 123 is reduced accordingly; at the same time, during this process, the blocking plate 102 is always in a state of blocking the discharge filter cartridge 101.

[0060] At the same time, when the material receiving box 111 moves to the first position, the material receiving box 111 pushes the first piston rod 1202, so that the space of the gas chamber 1204 becomes larger, and part of the gas in the second piston cylinder 1205 is drawn into the gas chamber 1204. At this time, the second piston rod 1206 moves under the action of negative pressure, and the second piston rod 1206 no longer squeezes the blocking plate 102; at the same time, while the first piston rod 1202 draws the gas in the second piston cylinder 1205 back to the gas chamber 1204, the first piston rod 1202 squeezes the liquid in the fluid chamber 1203 through the drain pipe 1209 into the second filter cylinder 904 for filtration.

[0061] When the electric telescopic member 112 continues to drive the material receiving box 111 to move away from the first filter cartridge 903 until it moves to the second position, Fig.10 As shown, during this process, the material receiving box 111 drives the filter plate 113 and the protrusion 117 to move synchronously, and the arc surface on the top of the protrusion 117 contacts the blocking ball 120 and lifts the blocking ball 120. The lifted blocking ball 120 drives the elastic sheet 119 to deform upward to a certain degree of arc, thereby releasing the limit on the protrusion 117. At this time, the tension spring 118 drives the protrusion 117 and the filter plate 113 to move toward the direction of the material receiving chamber 8, so that one side of the filter plate 113 is tightly fitted with the material receiving box 111, which is convenient for subsequent material collection; at the same time, During the movement of the material receiving box 111, the fixed plate 121 is also driven to move. Since the fixed plate 121 is already in contact with the limit plate at one end of the extension rod 122 at this time, the fixed plate 121 will drive the blocking plate 102 to move through the extension rod 122. At this time, the blocking plate 102 releases the blockage of the discharge filter cartridge 101, and the squeezed material in the discharge filter cartridge 101 falls to the top of the filter plate 113 located in the material receiving chamber 8 under the pushing action of the spiral conveying paddle 901, thereby realizing the collection of the material after secondary squeezing in the discharge filter cartridge 101.

[0062] At the same time, in the process of the material receiving box 111 moving to the second position, the material receiving box 111 further pushes the first piston rod 1202, so that the space of the gas chamber 1204 is further expanded, and part of the gas in the second piston cylinder 1205 is further drawn into the gas chamber 1204. At this time, the second piston rod 1206 continues to move under the action of negative pressure; at the same time, while the first piston rod 1202 further draws the gas in the second piston cylinder 1205 back to the gas chamber 1204, the first piston rod 1202 further squeezes the liquid in the fluid chamber 1203 through the drain pipe 1209 into the second filter cylinder 904 for filtration.

[0063] When the electric telescopic member 112 continues to drive the material receiving box 111 to move away from the first filter cartridge 903 until it moves to the third position, Fig.11 As shown, during this process, the material collecting box 111 drives the fixed plate 121 to move further, and the fixed plate 121 drives the extension rod 122 and the sealing plate 102 to move. At this time, with the cooperation of the limit block at the upper end of the sealing plate 102 and the limit groove at one end of the second filter cartridge 904, the sealing plate 102 will carry the second filter cartridge 904 to move synchronously, so that the discharge port 907 moves to above the filter plate 113 located inside the material collecting chamber 8, so that the material residue inside the second filter cartridge 904 moves toward the direction of the material collecting chamber 8 under the action of its own gravity and the inclined surface and finally falls through the discharge port 907 to above the filter plate 113 located inside the material collecting chamber 8, thereby cleaning the material residue in the second filter cartridge 904 to avoid excessive material residue in the second filter cartridge 904 affecting the filtering effect.

[0064] At the same time, in the process of the material receiving box 111 moving to the third position, the material receiving box 111 further pushes the first piston rod 1202, so that the space of the gas chamber 1204 is further expanded, and part of the gas in the second piston cylinder 1205 is further drawn into the gas chamber 1204. At this time, the second piston rod 1206 moves under the action of negative pressure; at the same time, while the first piston rod 1202 further draws the gas in the second piston cylinder 1205 back to the gas chamber 1204, the first piston rod 1202 further squeezes the remaining liquid in the fluid chamber 1203 through the drain pipe 1209 into the second filter cylinder 904 for filtration.

[0065] When the electric telescopic member 112 drives the material receiving box 111 to move from the third position to the second position, the material receiving box 111 drives the fixed plate 121 and the filter plate 113 to move synchronously; in this process, since the elastic coefficient of the extrusion spring 123 is large enough, the extrusion spring 123 will not shrink due to the extrusion of the fixed plate 121, so that the fixed plate 121 will preferentially push the blocking plate 102 to move along the second filter cartridge 904 through the extrusion spring 123. It should be noted that in this process, the position of the second filter cartridge 904 remains unchanged, and the blocking plate 102 moves relative to the second filter cartridge 904.

[0066] At the same time, when the material receiving box 111 moves from the third position to the second position, the material receiving box 111 pushes the first piston rod 1202, so that the space of the gas chamber 1204 is reduced, and the gas inside the gas chamber 1204 is pushed into the second piston cylinder 1205 through the air flow tube 1208. The gas reaches the second piston cylinder 1205 and pushes the second piston rod 1206 to move toward the second filter cylinder 904; while the first piston rod 1202 squeezes the gas chamber 1204 during movement, the first piston rod 1202 draws the liquid in the liquid storage tank 116 into the fluid chamber 1203 through the fluid tube 1207.

[0067] In the process of the electric telescopic member 112 driving the material receiving box 111 to move from the second position to the first position, the material receiving box 111 pushes the filter plate 113 to move synchronously, and squeezes the material on the filter plate 113 through the side of the material receiving box 111 and the partition plate 6 that are close to each other. At the same time, the extrusion spring 123 will not shrink due to the extrusion of the fixed plate 121, and the material receiving box 111 will push the blocking plate 102 to move through the fixed plate 121 and the extrusion spring 123 to block the discharge filter cartridge 101, so that the material will no longer be discharged from the discharge filter cartridge 101. In addition, in this process, through the cooperation of the upper end limit block of the blocking plate 102 and the limit groove at one end of the second filter cartridge 904, the relative position between the blocking plate 102 and the second filter cartridge 904 will no longer change, and the second filter cartridge 904 will follow the blocking plate 102 to move synchronously, and then reset, so that the discharge port 907 set at its bottom is blocked by the circular hole in the middle of the partition plate 6.

[0068] At the same time, in the process of the material receiving box 111 moving from the second position to the first position, the material receiving box 111 further pushes the first piston rod 1202, so that the space of the gas chamber 1204 is further reduced, and the gas inside the gas chamber 1204 is further pushed into the second piston cylinder 1205 through the air flow tube 1208. The gas reaches the second piston cylinder 1205 and further pushes the second piston rod 1206 to move toward the second filter cylinder 904; while the first piston rod 1202 squeezes the gas chamber 1204 during movement, the first piston rod 1202 further draws the liquid in the liquid storage tank 116 into the fluid chamber 1203 through the fluid tube 1207.

[0069] In the process that the electric telescopic member 112 drives the material receiving box 111 to move from the first position to the initial position, the material receiving box 111 drives the filter plate 113 to move synchronously, and the material is further squeezed by the partition plate 6 and the inner wall of the material receiving box 111. As the material receiving box 111 pushes the filter plate 113 to continue to move, the squeezing of the material gradually increases until the material receiving box 111 moves to the initial position, and the material is completely squeezed. When the material is squeezed, the liquid discharged enters the chute 114 through the filter holes on the filter plate 113, and then is transported to the liquid storage tank 116 through the connecting pipe 115 under the chute 114; while the material receiving box 111 moves from the first position to the initial position, the material receiving box 111 pushes the filter plate 113 to move continuously, and the material is squeezed gradually. 113 and the protrusion 117 move, and the protrusion 117 contacts with the blocking ball 120 during the movement. Under the action of the thrust of the electric telescopic member 112, the protrusion 117 lifts the blocking ball 120 and the elastic sheet 119 and moves to the other side of the blocking ball 120. The filter plate 113 is limited by the clamping connection between the protrusion 117 and the blocking ball 120. At the same time, the material collecting box 111 pushes the fixed plate 121 to move along the extension rod 122. The fixed plate 121 pushes the extrusion spring 123 during the movement. At this time, the extrusion spring 123 contracts, and the compressed extrusion spring 123 applies pressure to the blocking plate 102, thereby strengthening the blocking effect of the blocking plate 102 on the discharge filter cartridge 101.

[0070] At the same time, in the process of the material receiving box 111 moving from the first position to the initial position, the first piston rod 1202 squeezes the gas chamber 1204 during the movement and pushes the gas inside it into the second piston cylinder 1205 through the air flow tube 1208. When the gas reaches the second piston cylinder 1205, it pushes the second piston rod 1206 to continue moving part of the way in the direction of the second filter cylinder 904 and contact with the sealing plate 102. After the second piston rod 1206 contacts the sealing plate 102, it applies an extrusion force to the sealing plate 102 in the direction of the discharge filter cylinder 101, thereby further strengthening the sealing of the discharge filter cylinder 101 by the sealing plate 102, and avoiding that when the material is squeezed again, the sealing plate 102 is separated from the discharge filter cylinder 101 due to the greater material squeezing force, causing the material in the discharge filter cylinder 101 to leak out. While the first piston rod 1202 squeezes the gas chamber 1204 during movement, the first piston rod 1202 continues to draw the liquid in the liquid storage tank 116 into the fluid chamber 1203 through the fluid tube 1207. At this time, the liquid in the fluid chamber 1203 is filled.

[0071] Furthermore, when the second filter cartridge 904 moves along with the material collecting box 111, it will drive the cleaning frame 906 to move synchronously, so that the bristles on the cleaning frame 906 clean the first filter cartridge 903, thereby ensuring the outflow of the liquid.

[0072] When the material in the discharge filter cartridge 101 is squeezed again, the above operation can be repeated.

[0073] Through the cooperation of the discharge filter cartridge 101, the blocking plate 102, the fixing plate 121, the extension rod 122, the material receiving box 111 and the filter plate 113 and other components, when the material receiving box 111 moves from the initial position to the first position, a certain gap is generated between the material receiving box 111 and the filter plate 113, and this gap facilitates the squeezed material to fall into the material receiving cavity 8; when the material receiving box 111 moves to the second position, the material receiving box 111 drives the filter plate 113 to move and under the action of the tension spring 118, the filter plate 113 and the material receiving box 113 are connected. 1 is tightly fitted, the gap is closed, and at the same time, the material receiving box 111 drives the blocking plate 102 to release the blocking of the discharge filter cartridge 101 through the fixing plate 121 and the extension rod 122. At this time, the material in the discharge filter cartridge 101 falls to the top of the filter plate 113 located in the material receiving cavity 8; when the material receiving box 111 moves to the third position, the material receiving box 111, the filter plate 113 and the blocking plate 102 continue to move, and the blocking plate 102 drives the second filter cartridge 904 during the movement, so that the material residue in the second filter cartridge 904 is discharged from the discharge port 90 7, so as to prevent the material residue from blocking the filter holes in the second filter cartridge 904 and affecting the filtering effect; while the blocking plate 102 drives the second filter cartridge 904 to move, the second filter cartridge 904 drives the cleaning frame 906 to clean the filter holes in the first filter cartridge 903, so as to prevent the material residue from blocking the filter holes and affecting the outflow of the liquid, thereby improving the flow effect of the liquid; when the material receiving box 111 moves from the third position to the initial position, the material receiving box 111 pushes the material to squeeze it on one end of the partition plate 6, and passes through the material receiving box 1 11 squeezes the material again, strengthens the separation of material and liquid, and thus improves the separation effect of material and liquid; at the same time, the blocking plate 102 drives the second filter cartridge 904 and the cleaning frame 906 to reset, and the cleaning frame 906 cleans the first filter cartridge 903 again, and at the same time, the blocking plate 102 cooperates with the material receiving box 111, the fixing plate 121, the extension rod 122 and the squeezing spring 123 to seal the discharge filter cartridge 101, which is convenient for the material in the discharge filter cartridge 101 to be squeezed again, thereby improving the separation effect of material and liquid.

[0074] Through the cooperation of the first piston cylinder 1201, the first piston rod 1202, the second piston cylinder 1205 and the second piston rod 1206, the movement of the material receiving box 111 is controlled by the electric telescopic member 112. The material receiving box 111 pushes the first piston rod 1202 during the movement. The first piston rod 1202 refills the gas into the second piston cylinder 1205 through the air flow tube 1208, and then the second piston rod 1206 squeezes the blocking plate 102 to prevent the material from leaking out due to the poor blocking effect of the blocking plate 102 on the discharge filter cylinder 101 when the material is squeezed in the discharge filter cylinder 101. Through the cooperation of the second piston rod 1206 and the extrusion spring 123, the blocking effect of the blocking plate 102 on the discharge filter cylinder 101 is further enhanced.

[0075] Through the cooperation of the first piston cylinder 1201, the first piston rod 1202, the fluid cavity 1203 and the liquid storage tank 116, the first piston rod 1202 moves toward the working chamber 7 through the material receiving box 111, and the liquid in the liquid storage tank 116 is pumped into the fluid cavity 1203 through the fluid tube 1207. When the material receiving box 111 moves away from the working chamber 7, the material receiving box 111 drives the first piston rod 1202 to squeeze the liquid in the fluid cavity 1203. The squeezed liquid is discharged into the second filter cartridge 904 through the drain pipe 1209 and filtered downward layer by layer, thereby further improving the filtering effect of the liquid.

[0076] The present invention also provides a method for preparing dioctyl terephthalate using polyester waste, comprising the following steps:

[0077] Step 1, adding materials: introducing the crude product after alcohol extraction into the neutralization kettle 5, adding alkali solution into the neutralization kettle 5, stirring and mixing to cause a neutralization reaction;

[0078] Step 2: Material stirring: the reacted material enters the filter kettle 3 through the second pipeline 4, a certain amount of activated carbon is added and stirred for a period of time;

[0079] Step 3: Primary separation of material and liquid: The material in the filter kettle 3 is pumped into the filter press 1 through the filter pump and the first pipeline 2, and the conveying part 9 is started to separate the liquid and the material;

[0080] Step 4: Secondary separation of material and liquid: After the material and liquid are separated by the conveying part 9, the material is conveyed to the extrusion part 10 for secondary extrusion to increase the separation effect of the material and liquid;

[0081] Step 5, three-time separation of material and liquid: after the extrusion part 10 completes the extrusion, the material falls onto the filter plate 113, and at the same time, the material residue in the second filter cartridge 904 also falls onto the filter plate 113, and the material receiving box 111 and the electric telescopic member 112 cooperate to squeeze the material three times, thereby strengthening the separation of the material and the liquid;

[0082] Step 6, liquid collection: the separated liquid is filtered layer by layer through the first filter cartridge 903, the second filter cartridge 904 and the filter screen 905. After the liquid is filtered, it enters the product tank through the cooler to finally obtain the dioctyl terephthalate product.

[0083] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A device for preparing dioctyl terephthalate using polyester waste, comprising a filter press (1), one end of the filter press (1) being connected to a first pipeline (2), the other end of the first pipeline (2) being connected to a filter kettle (3), one end of the filter kettle (3) being connected to a second pipeline (4), and the other end of the second pipeline (4) being connected to a neutralization kettle (5), characterized in that: A partition plate (6) is fixedly arranged inside the filter press (1), and the partition plate (6) divides the interior of the filter press (1) into a working chamber (7) and a material receiving chamber (8); The conveying portion (9) comprises a screw conveying paddle (901), and the screw conveying paddle (901) is rotatably arranged in the working chamber (7), the conveying portion (9) is capable of squeezing the material and separating the liquid in the material, one end of the screw conveying paddle (901) is fixedly arranged with a driving motor (902), a first filter cartridge (903) is fixedly arranged inside the working chamber (7), the screw conveying paddle (901) is placed in the first filter cartridge (903), a second filter cartridge (904) is slidably arranged inside the working chamber (7), and the first filter cartridge (903) is placed in the second filter cartridge (904), and a discharge port (904) is provided at one end of the second filter cartridge (904) close to the squeezing portion (10) 907), an annular groove is provided at one end of the working chamber (7) close to the driving motor (902), a limiting groove is provided inside the annular groove, a limiting block is provided at one end of the second filter cartridge (904) close to the driving motor (902), and the second filter cartridge (904) slides axially along the annular groove through the cooperation between the limiting groove and the limiting block; the other end of the second filter cartridge (904) slides in a circular hole opened in the middle of the partition plate (6), and when the second filter cartridge (904) and the discharge port (907) are in the initial position, the thickness of the circular hole can achieve blocking of the discharge port (907), and a cleaning frame (906) is fixedly provided inside the second filter cartridge (904), and bristles are provided on the inner wall of the cleaning frame (906); An extrusion portion (10), comprising a discharge filter cartridge (101), wherein the discharge filter cartridge (101) is fixedly arranged at one end of the conveying portion (9), and after the extrusion portion (10) is blocked, the material can be squeezed again through the conveying portion (9), the discharge filter cartridge (101) is fixedly arranged at one end of a first filter cartridge (903), a sealing plate (102) is slidably arranged at one end of the second filter cartridge (904), a limit block is arranged at the upper end of the sealing plate (102), and a limit groove is arranged at one end of the second filter cartridge (904); A material receiving portion (11), comprising a material receiving box (111) and an electric telescopic member (112), wherein the material receiving box (111) is slidably arranged in the middle of the partition plate (6), the electric telescopic member (112) is fixedly arranged between the partition plate (6) and the material receiving chamber (8), the material receiving portion (111) is capable of collecting materials and re-extruding the materials, the material receiving box (111) is located in the material receiving chamber (8) and is fixedly connected to the movable end of the electric telescopic member (112), a filter plate (113) is slidably arranged at the bottom of the material receiving box (111), a limiting groove is arranged on the inner side wall of the material receiving box (111), a limiting block is arranged on the outer side wall of the filter plate (113), and a protrusion is fixedly arranged on the top of one end of the filter plate (113) located in the working chamber (7) (117), a plurality of tension springs (118) are provided between the material receiving box (111) and the protrusion (117), an elastic sheet (119) is fixedly provided inside the partition plate (6), and a plurality of blocking balls (120) are fixedly provided at the lower end of the elastic sheet (119), the elastic sheet (119) and the blocking balls (120) are used to limit the protrusion (117), a fixing plate (121) is fixedly provided at the upper end of the material receiving box (111), an extension rod (122) is fixedly provided at one end of the blocking plate (102), a limiting plate is provided at one end of the extension rod (122) away from the blocking plate (102), an extrusion spring (123) is sleeved on the outer side of the extension rod (122), and the upper end of the fixing plate (121) is slidably connected to the extension rod (122); An auxiliary part (12), comprising a first piston cylinder (1201), wherein the first piston cylinder (1201) is fixedly arranged in a material receiving chamber (8), and the material receiving chamber (11) can drive the auxiliary part (12) to transport gas and discharge liquid during movement, and a first piston rod (1202) is sealingly and slidably arranged inside the first piston cylinder (1201), and the other end of the first piston rod (1202) is fixedly arranged at one end of the material receiving box (111), and the interior of the first piston cylinder (1201) is divided into a fluid chamber (1203) and a gas chamber (1204) by one end of the first piston rod (1202), wherein the fluid chamber (1203) is used to discharge liquid, and the gas chamber (1204) is used to store gas; When the material in the discharge filter cartridge (101) is squeezed again, the electric telescopic member (112) drives the material receiving box (111) to move from the initial position in a direction away from the first filter cartridge (903) until it moves to the first position, at which time the tension spring (118) is stretched, and the filter plate (113) and the protrusion (117) are still in a stuck state, and the material receiving box (111) slides along the filter plate (113) and a certain gap is generated between the filter plate (113) and the filter plate (113); the squeezed material on the top of the filter plate (113) in the material receiving chamber (8) falls into the material receiving chamber (8) through the gap; at the same time, the material receiving box (111) also drives the fixed plate (121) to move, and the fixed plate (121) slides along the extension rod (122) during the movement; When the electric telescopic member (112) continues to drive the material receiving box (111) to move away from the first filter cartridge (903) until it moves to the second position, during this process, the material receiving box (111) drives the filter plate (113) and the protrusion (117) to move synchronously, and the arc surface at the top of the protrusion (117) contacts the blocking ball (120) and lifts the blocking ball (120); at this time, the tension spring (118) drives the protrusion (117) and the filter plate (113) to move in the direction of the material receiving chamber (8), so that one side of the filter plate (113) is in contact with the material receiving box (111). Tightly fit; at the same time, during the movement of the material receiving box (111), the fixed plate (121) is also driven to move. Since the fixed plate (121) is already in contact with the limit plate at one end of the extension rod (122), the fixed plate (121) will drive the blocking plate (102) to move through the extension rod (122). At this time, the blocking plate (102) releases the blockage of the discharge filter cartridge (101), and the squeezed material in the discharge filter cartridge (101) falls to the top of the filter plate (113) located in the material receiving chamber (8) under the pushing action of the screw conveying paddle (901); When the electric telescopic member (112) continues to drive the material receiving box (111) to move away from the first filter cartridge (903) until it moves to the third position, during this process, the material receiving box (111) drives the fixed plate (121) to move further, and the fixed plate (121) drives the extension rod (122) and the blocking plate (102) to move. At this time, under the cooperation of the upper limit block of the blocking plate (102) and the limit groove at one end of the second filter cartridge (904), the blocking plate (102) will move synchronously with the second filter cartridge (904), so that the discharge port (907) moves to the top of the filter plate (113) located inside the material receiving chamber (8), and the material residue inside the second filter cartridge (904) falls through the discharge port (907) to the top of the filter plate (113) located inside the material receiving chamber (8); When the electric telescopic member (112) drives the material receiving box (111) to move from the second position to the first position, the material receiving box (111) pushes the filter plate (113) to move synchronously, and the material on the filter plate (113) is squeezed through the side surfaces of the material receiving box (111) and the partition plate (6) that are close to each other.

2. The device for preparing dioctyl terephthalate using polyester waste according to claim 1, characterized in that: The driving motor (902) is fixedly arranged at one end of the filter press (1); a filter screen (905) is provided below the second filter cartridge (904); and the filter screen (905) is fixedly arranged inside the partition plate (6).

3. The device for preparing dioctyl terephthalate using polyester waste according to claim 2, characterized in that: The second filter cartridge (904) is capable of driving the cleaning frame (906) when in motion, so that the cleaning frame (906) cleans the first filter cartridge (903) during the motion.

4. The device for preparing dioctyl terephthalate using polyester waste according to claim 3, characterized in that: The blocking plate (102) is used to block the discharge filter cartridge (101).

5. The device for preparing dioctyl terephthalate using polyester waste according to claim 3, characterized in that: An inclined groove (114) is provided inside the filter plate (113), the bottom of the inclined groove (114) is connected to a connecting pipe (115), and the other end of the connecting pipe (115) is connected to a liquid storage tank (116) provided in the middle of the partition plate (6).

6. The device for preparing dioctyl terephthalate using polyester waste according to claim 5, characterized in that: The upper end of the protrusion (117) is provided with an arc-shaped surface.

7. The device for preparing dioctyl terephthalate using polyester waste according to claim 1, characterized in that: A second piston cylinder (1205) is fixedly arranged in the material receiving chamber (8), and a second piston rod (1206) is sealingly and slidably arranged inside the second piston cylinder (1205); one end of the fluid chamber (1203) is connected to a fluid tube (1207), and the fluid tube (1207) is connected to the liquid storage tank (116); the other end of the fluid chamber (1203) is connected to a drainage pipe (1209), and the other end of the drainage pipe (1209) passes through the partition plate (6) to the second filter cylinder (904); and an air flow pipe (1208) is connected between the gas chamber (1204) and the second piston cylinder (1205).

8. The device for preparing dioctyl terephthalate from polyester waste according to claim 6, characterized in that: A liquid collecting tank (13) is provided inside the working chamber (7), the bottom of the liquid collecting tank (13) is connected to a liquid drain pipe (14), and the liquid drain pipe (14) penetrates the liquid collecting tank (13) and the filter press (1) and extends out of the outer wall of the filter press (1).

9. A method for preparing dioctyl terephthalate from polyester waste, applied to the device for preparing dioctyl terephthalate from polyester waste as claimed in claim 5, characterized in that: The following steps are involved: Step 1, adding materials: introducing the crude product after alcohol extraction into the neutralization kettle (5), adding alkali solution into the neutralization kettle (5), stirring and mixing to cause a neutralization reaction; Step 2: Material stirring: the reacted material enters the filter kettle (3) through the second pipeline (4), a certain amount of activated carbon is added and stirred for a period of time; Step 3: primary separation of the material and the liquid: the material in the filter kettle (3) is pumped into the pressure filter (1) through the filter pump and the first pipeline (2), and the conveying part (9) is started to separate the liquid and the material; Step 4: Secondary separation of material and liquid: After the material and liquid are separated by the conveying part (9), the material is conveyed to the extrusion part (10) for secondary extrusion to increase the separation effect of the material and liquid; Step 5, three-time separation of material and liquid: after the extrusion of the extrusion part (10) is completed, the material falls onto the filter plate (113), and at the same time, the material residue in the second filter cartridge (904) also falls onto the filter plate (113), and the material receiving box (111) and the electric telescopic member (112) cooperate to perform three-time extrusion on the material, thereby enhancing the separation of the material and the liquid; Step 6, liquid collection: The separated liquid is filtered layer by layer through the first filter cartridge (903), the second filter cartridge (904) and the filter screen (905). After the liquid is filtered, it enters the product tank through the cooler to finally obtain the dioctyl terephthalate product.

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