A NMP distillation purification process and purification device

Abstract

The invention discloses an NMP distillation purification process and a purification device thereof, belonging to the technical field of NMP purification, comprising a multi-stage filtering mechanism, a filter residue removing mechanism, a dehydration mechanism, a distillation tower and a collecting tower, wherein the multi-stage filtering mechanism comprises a support platform, a storage barrel is fixedly provided below the support platform, a filter barrel is slidably provided on the storage barrel, a grinding barrel is detachably provided on the filter barrel, and the filter barrel comprises a first filter plate and a second filter plate. The invention provides a grinding column in a first cylindrical barrel to crush agglomerated waste materials in waste liquid to ensure the recovery rate of waste liquid, and at the same time, a multi-stage filtering mechanism is provided, a second filter plate and a first filter plate are provided in the multi-stage filtering mechanism, a second filter plate and a first scraper are provided on the second filter plate and the first filter plate respectively, and the second scraper and the first scraper are used to scrape filter residues on the first filter plate and the second filter plate to avoid excessive impurities from accumulating on the filter plates to affect the recovery quality of waste liquid.

Description

Technical Field

[0001] The invention belongs to the technical field of NMP purification, and in particular relates to an NMP distillation purification process and a purification device thereof. Background Art

[0002] NMP is a commonly used organic solvent that is widely used in the industrial field. NMP recovery and NMP distillation are two processes related to NMP treatment. NMP recovery refers to the process of reusing used NMP. In some industrial processes, NMP may be contaminated or diluted and needs to be recovered for extraction and purification. Generally, NMP recovery includes physical methods and chemical methods. Physical methods can include distillation, evaporation, distillation, extraction and other techniques for separating and recovering NMP from waste liquids. NMP distillation is the process of purifying NMP. Through distillation, impurities and other solvents in NMP can be separated to obtain a high-purity NMP product.

[0003] During the recovery process of NMP waste liquid, there may be some large-sized impurity particles inside, which need to be filtered. During the filtration process, these impurities gradually accumulate on the filter screen, affecting the filtration rate over time and further affecting the recovery quality of NMP waste liquid. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a NMP distillation purification process and a purification device thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A NMP distillation and purification device, comprising a multi-stage filtering mechanism, a filter residue removal mechanism, a dehydration mechanism, a distillation tower and a collection tower, wherein the multi-stage filtering mechanism comprises a support platform, a storage barrel is fixedly provided below the support platform, a filter barrel is slidably provided on the storage barrel, a grinding barrel is detachably provided on the filter barrel, the filter barrel comprises a first filter plate and a second filter plate, a first scraper and a second scraper are slidably provided on the first filter plate and the second filter plate, respectively, the first scraper and the second scraper are fixedly connected, the grinding barrel comprises a rectangular outer shell plate, a first cylindrical barrel is provided in the rectangular outer shell plate, and a grinding column is rotatably provided in the first cylindrical barrel;

[0007] The dehydration mechanism comprises a dehydration tower, a scraper box is rotatably arranged in the dehydration tower, an arc-shaped scraper is fixedly arranged on the scraper box, a third scraper is also slidably arranged in the scraper box, and a rectangular collecting trough is arranged at the bottom end of the dehydration tower;

[0008] The filter residue removal mechanism includes a first tilting platform and a second tilting platform.

[0009] Furthermore, a first supporting foot is fixedly provided at the bottom end of the support platform, a plurality of first liquid outlets are provided on the side of the storage barrel, a connecting tube is also fixedly provided above the support platform, the connecting tube and the storage barrel are connected as one, both are fixed on the support platform, and both have hollow structures inside, a first mounting plate is provided on the outer side of the top end of the connecting tube, a side plate is fixedly provided on the first mounting plate, a filter barrel is slidably provided inside the side plate, a grinding barrel is detachably connected above the filter barrel, a water storage tank is provided in the storage barrel, a first connecting pipe is connected to the water storage tank, and the other end of the first connecting pipe is connected to the dehydration mechanism.

[0010] Furthermore, a mounting base is fixedly provided next to the support platform, mounting brackets are fixedly provided on both sides of the mounting base, a first threaded rod is rotatably provided between the mounting brackets on both sides, and a limit rod is fixedly provided, wherein one end of the first threaded rod is connected to a first motor, the first motor and the mounting bracket are fixedly connected, a connecting block is threadedly fitted on the first threaded rod, the connecting block is fixedly connected to the filter barrel, and the connecting block is slidably connected to the limit rod, and a plurality of telescopic cylinders are also fixedly provided on the mounting base, the output ends of the plurality of telescopic cylinders are fixedly connected to a connecting plate, and the connecting plate is fixedly connected to the grinding barrel.

[0011] Furthermore, the filter barrel includes a trapezoidal outer shell plate, a first filter plate is fixedly provided on the hypotenuse of the trapezoidal outer shell plate, a second filter plate is fixedly provided on the right-angled side of the trapezoidal outer shell plate corresponding to the hypotenuse, wherein the size of the second filter plate is larger than the surface size of the corresponding right-angled side, that is, the second filter plate extends beyond the trapezoidal outer shell plate on all sides, a circle of card grooves is provided on the second filter plate, the card grooves are U-shaped, a first scraper is slidably provided on the first filter plate, and a second scraper is slidably provided on the second filter plate, wherein the second scraper is fixedly connected to the first scraper by a connecting rod, a slot is provided on the second filter plate, the connecting rod slides in the slot, a rack is also fixedly provided on the connecting rod, and a through groove is also provided at the opening of the slot on one side of the second filter plate.

[0012] Furthermore, the grinding barrel includes a rectangular outer shell plate, a trapezoidal plug plate is fixedly provided on one side of the rectangular outer shell plate, a rectangular plate is fixedly provided inside the rectangular outer shell plate, a first cylindrical barrel is fixedly provided on the rectangular plate, a plurality of leakage holes are opened at the bottom end of the first cylindrical barrel, a second cylindrical barrel is fixedly provided on the first cylindrical barrel, a liquid inlet pipe is connected to the second cylindrical barrel, a third motor is fixedly provided on the top end of the second cylindrical barrel, a grinding column is provided in the first cylindrical barrel, a long rotating shaft is fixedly provided on the grinding column, the long rotating shaft is fixed and coaxially connected to the grinding column, an output end of the third motor is fixedly connected to the long rotating shaft, and the third motor works to realize the long rotating shaft driving the grinding column to rotate to realize the crushing function, the bottom end of the first cylindrical barrel passes through the rectangular plate, and both the first cylindrical barrel and the second cylindrical barrel are hollow inside.

[0013] Furthermore, a bottom bracket is fixedly provided at the bottom end of the dehydration tower, and a plurality of second supporting legs are fixedly provided on the bottom bracket. A heating mechanism is also fixedly provided inside the bottom end of the dehydration tower, and the heating mechanism is used to heat the interior of the dehydration tower. A first connecting pipe is connected to the upper position of the dehydration tower, and a hollow tube is fixedly provided at one end of the rectangular collecting trough. The hollow tube passes through the bottom of the dehydration tower and is located outside the dehydration mechanism. A second connecting pipe is also connected to the lower end of the dehydration tower, and the second connecting pipe is connected to the distillation tower. An exhaust mechanism is also fixedly provided at the top of the dehydration tower.

[0014] The cam is provided with a first motor, and the second motor is provided with a second motor for rotating the second end of the second gear.

[0015] Furthermore, the filter residue removal mechanism includes a vertical plate fixedly provided next to the multi-stage filtering mechanism, a first inclined platform fixedly provided on the vertical plate, a second inclined platform fixedly provided above the first inclined platform, a rectangular through groove opened on the vertical plate between the first inclined platform and the second inclined platform, long baffles are provided on the first inclined platform and the second inclined platform, a collecting frame is fixedly provided on the back side of the vertical plate below the rectangular through groove, a fixed bracket is fixedly provided next to the vertical plate, a cylindrical rod is rotatably provided on the fixed bracket, a gear is fixedly provided on the top of the cylindrical rod, a first pulley is provided at the rotatable connection between the cylindrical rod and the fixed bracket, the first pulley is fixedly connected to the cylindrical rod and rotates coaxially, a second pulley is also rotatably provided on the fixed bracket, the first pulley and the second pulley are connected by a belt, a second motor is connected to the second pulley, and the second motor is fixedly connected to the fixed bracket.

[0016] Furthermore, the dehydration mechanism is connected to the distillation tower through a second connecting pipe, and the distillation tower is also provided with a third connecting pipe, on which a condenser is installed, and the other end of the third connecting pipe is connected to a collection tower, on which a discharge port is provided.

[0017] A purification device for an NMP distillation purification device comprises the following steps:

[0018] S1: First, NMP waste liquid containing impurities is input into the second cylindrical barrel through the liquid inlet pipe, and the grinding column in the first cylindrical barrel rotates under the drive of the third motor to break the large-sized agglomerated particles in the NMP waste liquid. The broken agglomerated particles enter the filter barrel through the leakage hole with the waste liquid for multi-stage filtration;

[0019] S2: After the NMP waste liquid enters the filter barrel, it first passes through the second filter plate to perform primary filtration on the solid impurities in the NMP waste liquid. The filtered liquid enters the first filter plate for secondary filtration. The filtrate after multi-stage filtration enters the storage barrel for storage, and the filter residues remaining on the first filter plate and the second filter plate are processed by the following steps: first, the grinding barrel is lifted upward as a whole by extending the telescopic cylinder. At this time, the trapezoidal plug plate on the grinding barrel will be pulled out of the through groove, and the filter barrel is in a naked state. Then, the filter barrel is driven horizontally by the first motor until the rack on the filter barrel contacts and meshes with the gear. The second motor drives the gear to rotate, so that the rack drives the second scraper and the first scraper to move along the upper surfaces of the second filter plate and the first filter plate respectively, and the filter residues on the second filter plate and the first filter plate are scraped off onto the first inclined platform and the second inclined platform, and then flow into the collection frame through the first inclined platform and the second inclined platform for collection. After the second filter plate and the first filter plate are cleaned, they are reset;

[0020] S3: The NMP waste liquid in the storage barrel is transported to the dehydration mechanism through the first connecting pipe for primary dehydration. After the NMP waste liquid enters the dehydration mechanism, the heating mechanism heats the liquid in the dehydration mechanism, and the water vapor is discharged by the heating mechanism. After the initial dehydration is completed, the waste liquid in the NMP waste liquid enters the distillation tower through the second connecting pipe for distillation. Some viscous waste liquid will remain on the bottom and side walls of the dehydration mechanism. The steps for processing these viscous substances are as follows: the fifth motor drives the rotating block to rotate, and the scraper box and the arc scraper rotate synchronously when the rotating block rotates. The scraper box scrapes the bottom of the dehydration tower. Scraping, the arc scraper is fitted with the side wall of the dehydration tower to scrape the side wall of the dehydration tower. The scraped viscous material will be collected in the rectangular collection tank for collection. Then the scraper box is rotated to the top of the rectangular collection tank, and the cylindrical pressure rod is rotated to apply a downward force to the bending plate. The bending plate will move downward, and the third scraper fixedly connected thereto will also move downward. The third scraper will eventually contact the bottom surface of the rectangular collection tank, and then drive the second threaded rod to rotate. The second threaded rod will drive the third scraper to slide in the rectangular collection tank, scraping the viscous material collected in the rectangular collection tank to the hollow tube at one end, and then flowing out through the hollow tube;

[0021] S4: The NMP waste liquid entering the distillation tower is distilled by the distillation tower, and the NMP after distillation is condensed by the condenser. The condensed liquid enters the collection tower for collection, and is finally discharged from the discharge port.

[0022] Beneficial effects of the present invention:

[0023] 1. The present invention provides a grinding column in the first cylindrical barrel to break up the agglomerated waste in the waste liquid to ensure the recovery rate of the waste liquid. At the same time, a multi-stage filtering mechanism is provided. The multi-stage filtering mechanism is provided with a second filter plate and a first filter plate. The second filter plate and the first filter plate are respectively provided with a second scraper and a first scraper. The second scraper and the first scraper are used to scrape off the filter residues on the first filter plate and the second filter plate to avoid excessive accumulation of impurities on the filter plates, which affects the quality of waste liquid recovery.

[0024] 2. The present invention is also provided with a dehydration mechanism, which is used for the preliminary dehydration of NMP waste liquid. A scraping box and an arc scraper are also provided in the dehydration mechanism. The scraping box is used to scrape off the viscous material remaining at the bottom of the dehydration mechanism, and the arc scraper is used to scrape off the viscous material on the inner wall of the dehydration mechanism. After scraping, the viscous material will be collected in a rectangular collecting trough and scraped by a third scraper to ensure the cleanliness of the inside of the dehydration mechanism. At the same time, the scraping box and the arc scraper can also act as a stirring rod during use, stirring the liquid in the dehydration mechanism when it is heated, thereby accelerating its dehydration rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 The overall structure of the present invention is shown in FIG. Figure I ;

[0027] Figure 2 It is a schematic diagram of the structure of the multi-stage filtering mechanism of the present invention;

[0028] Figure 3 It is a schematic diagram of the internal structure of the multi-stage filtering mechanism of the present invention;

[0029] Figure 4 It is an enlarged schematic diagram of the structure of part A of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the filter residue removal mechanism of the present invention;

[0031] Figure 6 It is an enlarged schematic diagram of the structure of part B of the present invention;

[0032] Figure 7 It is a schematic diagram of the internal structure of the grinding barrel of the present invention;

[0033] Figure 8 It is an enlarged schematic diagram of the structure of part C of the present invention;

[0034] Fig. 9 It is a front view of the structural schematic diagram of the present invention;

[0035] Fig.10 is an internal cross-sectional view of the first cylindrical barrel and the second cylindrical barrel of the present invention;

[0036] Fig.11 It is a schematic diagram of the internal structure of the dehydration mechanism of the present invention;

[0037] Fig.12 It is an enlarged schematic diagram of the structure of part D of the present invention;

[0038] Fig.13 The overall structure of the present invention is shown in FIG. Figure II .

[0039] 1. Multi-stage filtering mechanism; 2. Filter residue removal mechanism; 3. Dehydration mechanism; 4. Distillation tower; 5. Collection tower; 6. Condenser; 7. Third connecting pipe; 8. Discharge port; 101. Support platform; 102. First support foot; 103. Storage barrel; 104. First liquid outlet; 105. Connecting cylinder; 106. First mounting plate; 107. Side plate; 108. Filter barrel; 109. Grinding barrel; 110. Mounting base; 111. Mounting bracket; 112. First threaded rod; 113. Limit rod; 114. Connecting block; 115, first motor; 116, telescopic cylinder; 117, connecting plate; 118, first connecting pipe; 119, water storage tank; 201, vertical plate; 202, second tilting platform; 203, first tilting platform; 204, long stop bar; 205, rectangular through groove; 206, collecting frame; 207, cylindrical rod; 208, fixed bracket; 209, gear; 210, first pulley; 211, second pulley; 212, belt; 213, second motor; 301, dehydration tower; 302, bottom bracket; 303, second supporting leg ; 304, second connecting pipe; 305, exhaust mechanism; 306, heating mechanism; 307, rectangular collecting trough; 308, hollow tube; 309, scraping box; 310, arc scraper; 311, rotating block; 312, second threaded rod; 313, slide bracket; 314, third scraper; 315, limit plate; 316, bending plate; 317, rectangular block; 318, rotating rod; 319, cylindrical pressure rod; 320, L-shaped limit groove; 321, top plate; 322, spring; 1081, trapezoidal shell plate; 108 2. Second filter plate; 1083. First filter plate; 1084. Slot; 1085. Second scraper; 1086. First scraper; 1087. Connecting rod; 1088. Rack; 1089. Slot; 10810. Through slot; 1091. Rectangular outer shell plate; 1092. Trapezoidal plug plate; 1093. Liquid inlet pipe; 1094. Third motor; 1095. Second cylindrical barrel; 1096. First cylindrical barrel; 1097. Leakage hole; 1098. Grinding column; 1099. Long rotating shaft; 10910. Rectangular plate. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, a NMP distillation and purification device includes a multi-stage filtering mechanism 1, a filter residue removal mechanism 2, a dehydration mechanism 3, a distillation tower 4, and a collection tower 5.

[0042] like Figure 2 As shown, the multi-stage filtering mechanism 1 includes a support platform 101, a first supporting foot 102 is fixedly provided at the bottom end of the support platform 101, a storage barrel 103 is fixedly provided on the support platform 101, a plurality of first liquid outlets 104 are provided on the side of the storage barrel 103, a connecting cylinder 105 is also fixedly provided above the support platform 101, the connecting cylinder 105 and the storage barrel 103 are connected as a whole, both are fixed on the support platform 101, and both have a hollow structure inside, a first mounting plate 106 is provided on the outer side of the top end of the connecting cylinder 105, a side plate 107 is fixedly provided on the first mounting plate 106, a filter barrel 108 is slidably provided in the side plate 107, a grinding barrel 109 is detachably connected above the filter barrel 108, a mounting base 110 is fixedly provided next to the support platform 101, mounting brackets 111 are fixedly provided on both sides of the mounting base 110, and a first threaded rod 11 is rotatably provided between the mounting brackets 111 on both sides. 2. A limiting rod 113 is fixedly provided, wherein one end of the first threaded rod 112 is connected to a first motor 115, the first motor 115 is fixedly connected to the mounting bracket 111, a connecting block 114 is threadedly matched on the first threaded rod 112, the connecting block 114 is fixedly connected to the filter barrel 108, and the connecting block 114 is slidably connected to the limiting rod 113. When the first motor 115 is working, the first threaded rod 112 rotates to realize the sliding of the filter barrel 108 on the limiting rod 113. A plurality of telescopic cylinders 116 are also fixedly provided on the mounting base 110, and a connecting plate 117 is fixedly connected to the output end of the plurality of telescopic cylinders 116, and the connecting plate 117 is fixedly connected to the grinding barrel 109. When the telescopic cylinder 116 is controlled to extend, the grinding barrel 109 will move upward and separate from the filter barrel 108, and when the telescopic cylinder 116 is shortened, the grinding barrel 109 will move downward and engage with the filter barrel 108.

[0043] like Figure 2 As shown, the filter residue removal mechanism 2 includes a vertical plate 201 fixedly provided next to the multi-stage filtering mechanism 1, a first inclined platform 203 is fixedly provided on the vertical plate 201, a second inclined platform 202 is fixedly provided on the vertical plate 201 above the first inclined platform 203, a rectangular through groove 205 is opened on the vertical plate 201 between the first inclined platform 203 and the second inclined platform 202, long baffles 204 are provided on the first inclined platform 203 and the second inclined platform 202, and a collecting frame 206 is fixedly provided on the back of the vertical plate 201 below the rectangular through groove 205.

[0044] like Figure 5 and Figure 6As shown, a fixed bracket 208 is fixedly provided next to the vertical plate 201, and a cylindrical rod 207 is rotatably provided on the fixed bracket 208. A gear 209 is fixedly provided on the top of the cylindrical rod 207. A first pulley 210 is provided at the rotatable connection between the cylindrical rod 207 and the fixed bracket 208. The first pulley 210 is fixedly connected to the cylindrical rod 207 and rotates coaxially. A second pulley 211 is also rotatably provided on the fixed bracket 208. The first pulley 210 and the second pulley 211 are connected by a belt 212. A second motor 213 is connected to the second pulley 211, and the second motor 213 is fixedly connected to the fixed bracket 208. When the second motor 213 is started, the second pulley 211 is driven to rotate, and the first pulley 210 is further driven to rotate through the belt 212, thereby realizing the rotation of the cylindrical rod 207.

[0045] like Figure 3 and Figure 4 As shown, a water storage tank 119 is provided in the storage barrel 103, and a first connecting pipe 118 is connected to the water storage tank 119, and the other end of the first connecting pipe 118 is connected to the dehydration mechanism 3, and the filter barrel 108 includes a trapezoidal shell plate 1081, and a first filter plate 1083 is fixedly provided on the hypotenuse of the trapezoidal shell plate 1081, and a second filter plate 1082 is fixedly provided on the right angle side corresponding to the hypotenuse of the trapezoidal shell plate 1081, wherein the size of the second filter plate 1082 is larger than the surface size of the corresponding right angle side, that is, the second filter plate 1082 is slightly beyond the trapezoidal shell plate 1081 on all sides, and the second filter plate 1082 A circle of slots 1084 is provided on the top, and the slots 1084 are U-shaped. A first scraper 1086 is slidably provided on the first filter plate 1083, and a second scraper 1085 is slidably provided on the second filter plate 1082, wherein the second scraper 1085 is fixedly connected to the first scraper 1086 by a connecting rod 1087. A slot 1089 is provided on the second filter plate 1082, and the connecting rod 1087 slides in the slot 1089. A rack 1088 is also fixedly provided on the connecting rod 1087, and a through slot 10810 is also provided at the opening of the slot 1089 on one side of the second filter plate 1082. The rack 1088 can drive the second scraper 1085 and the first scraper 1086 to move along the second filter plate 1082 and the first filter plate 1083 respectively to scrape off the residual filter residue on the second filter plate 1082 and the first filter plate 1083 to avoid the second filter plate 1082 and the first filter plate 1083 being blocked due to long-term cleaning.

[0046] like Figure 7 and Figure 8As shown, the grinding barrel 109 includes a rectangular outer shell plate 1091, and a trapezoidal plug plate 1092 is fixedly provided on one side of the rectangular outer shell plate 1091. When the grinding barrel 109 moves downward, the trapezoidal plug plate 1092 is inserted into the through groove 10810, and the rectangular outer shell plate 1091 is engaged with the card slot 1084 to achieve a sealed engagement between the grinding barrel 109 and the filter barrel 108. A rectangular plate 10910 is fixedly provided in the rectangular outer shell plate 1091, and a first cylindrical barrel 1096 is fixedly provided on the rectangular plate 10910. A plurality of leakage holes 1097 are opened at the bottom end of the first cylindrical barrel 1096. A second cylindrical barrel 1095 is fixedly provided on the first cylindrical barrel 1096. A liquid inlet pipe 1093 is connected to the second cylindrical barrel 1095, and a third motor 1094 is fixedly provided on the top of the second cylindrical barrel 1095. Fig. 9 and Fig.10 As shown, a grinding column 1098 is provided in the first cylindrical barrel 1096, and a long rotating shaft 1099 is fixed on the grinding column 1098. The long rotating shaft 1099 is fixed and coaxially connected to the grinding column 1098. The output end of the third motor 1094 is fixedly connected to the long rotating shaft 1099. The third motor 1094 works to realize that the long rotating shaft 1099 drives the grinding column 1098 to rotate to realize the crushing function. The bottom end of the first cylindrical barrel 1096 passes through the rectangular plate 10910, and the first cylindrical barrel 1096 and the second cylindrical barrel 1095 are both in an internal hollow state. When the NMP waste liquid enters the second cylindrical barrel 1095 through the liquid inlet pipe 1093, it first rotates through the grinding column 1098 to crush the large-sized solid waste particles in the waste liquid. The crushed waste liquid and particles enter the filter barrel 108 through the leakage hole 1097 for multi-stage filtration.

[0047] like Fig.11 As shown, the dehydration mechanism 3 includes a dehydration tower 301, a bottom bracket 302 is fixedly provided at the bottom end of the dehydration tower 301, a plurality of second support legs 303 are fixedly provided on the bottom bracket 302, a heating mechanism 306 is fixedly provided inside the bottom end of the dehydration tower 301, and the heating mechanism 306 is used to heat the inside of the dehydration tower 301, and the first connecting pipe 118 is connected to the upper position of the dehydration tower 301, and the filtered NMP waste liquid is output to the dehydration tower 301 through the first connecting pipe 118, and a rectangular collecting tank 307 is provided at the bottom end of the dehydration tower 301. A hollow tube 308 is fixedly provided at one end of the collecting trough 307, and the hollow tube 308 passes through the bottom of the dehydration tower 301 and is located outside the dehydration mechanism 3. A second connecting pipe 304 is also connected to the bottom end of the dehydration tower 301, and the second connecting pipe 304 is connected to the distillation tower 4. An exhaust mechanism 305 is also fixedly provided at the top of the dehydration tower 301. When the dehydration tower 301 is heated, water vapor will be generated inside the dehydration tower and will be discharged through the exhaust mechanism 305. A scraper box 309 is also rotatably provided at the bottom end of the interior of the dehydration tower 301, and an arc-shaped scraper 310 is fixedly provided at one end of the scraper box 309.

[0048] like Fig.12 As shown, a movable groove is provided inside the scraper box 309, and the movable groove runs through the upper and lower ends of the scraper box 309. A second threaded rod 312 is also rotatably provided in the movable groove in the scraper box 309. A slide bracket 313 is threadedly matched on the second threaded rod 312. One end of the second threaded rod 312 is connected to a fourth motor. The fourth motor drives the second threaded rod 312 to rotate. The slide bracket 313 is slidably connected to the scraper box 309. A top plate 321 is also fixedly provided on the slide bracket 313. A spring 322 is fixedly provided at the bottom end of the top plate 321. A bending plate 316 is fixedly connected to the end of the spring 322. The plate 316 is slidably connected to the slide bracket 313, a third scraper 314 is fixedly provided on the bending plate 316, a limiting plate 315 is also fixedly provided on the side of the bending plate 316, an L-shaped limiting groove 320 is provided on the side of the scraper box 309, a rotating block 311 is rotatably provided at the middle position of the bottom of the dehydration tower 301, the rotating block 311 is fixedly connected to the scraper box 309, a rectangular block 317 is fixedly provided on the rotating block 311, two rotating rods 318 are rotatably provided on the rectangular block 317, a cylindrical pressure rod 319 is rotatably provided between the two rotating rods 318, and the cylindrical pressure rod 319 is located above the bending plate 316.

[0049] The rotating block 311 can be driven by the fifth motor, which is fixedly installed at the bottom of the dehydration tower 301 to drive the rotating block 311 to rotate. During the rotation of the rotating block 311, the scraper box 309 scrapes the viscous material at the bottom of the dehydration tower 301, and the arc scraper 310 scrapes the viscous material on the inner wall of the dehydration tower 301. After one rotation, the viscous material on the inner wall and the bottom will gather in the rectangular collecting trough 307 for centralized collection.

[0050] When the cylindrical pressure rod 319 rotates, the bending plate 316 can be pressed downward, the spring 322 is stretched, and the third scraper 314 moves downward into the rectangular collecting groove 307. As the bending plate 316 slides downward along the slide bracket 313, the limit plate 315 moves downward along the L-shaped limit groove 320. When it moves to the bottom end of the L-shaped limit groove 320, the second threaded rod 312 rotates to drive the slide bracket 313 and the upper bending plate 316 to move horizontally. At this time, the third scraper 314 will move in the rectangular collecting groove 307, scrape the viscous material in the rectangular collecting groove 307 to the hollow tube 308, and flow out of the dehydration tower 301.

[0051] like Fig.13 The dehydration mechanism 3 shown is connected to the distillation tower 4 through the second connecting pipe 304. The NMP waste liquid that has been preliminarily dehydrated by the dehydration mechanism 3 enters the distillation tower 4 for distillation. The distillation tower 4 is also provided with a third connecting pipe 7, on which a condenser 6 is installed. The other end of the third connecting pipe 7 is connected to the collection tower 5, and the collection tower 5 is provided with a discharge port 8.

[0052] A NMP distillation and purification process, using the above-mentioned device to carry out NMP distillation and purification, specifically comprises the following steps:

[0053] S1: First, the NMP waste liquid containing impurities is input into the second cylindrical barrel 1095 through the liquid inlet pipe 1093, and the grinding column 1098 in the first cylindrical barrel 1096 rotates under the drive of the third motor 1094 to break the large-sized agglomerated particles in the NMP waste liquid. The broken agglomerated particles enter the filter barrel 108 through the leakage hole 1097 with the waste liquid for multi-stage filtration;

[0054] S2: After the NMP waste liquid enters the filter barrel 108, it first passes through the second filter plate 1082 to perform primary filtration on the solid impurities in the NMP waste liquid. The filtered liquid enters the first filter plate 1083 for secondary filtration. The filtrate after multi-stage filtration enters the storage barrel 103 for storage. The filter residues remaining on the first filter plate 1083 and the second filter plate 1082 are processed by the following steps: First, the grinding barrel 109 is lifted upward as a whole by extending the telescopic cylinder 116. At this time, the trapezoidal plug plate 1092 on the grinding barrel 109 will be pulled out of the through groove 10810, and the filter barrel 108 is exposed. state, and then the first motor 115 drives the filter barrel 108 to move horizontally until the rack 1088 on the filter barrel 108 contacts and meshes with the gear 209, and the second motor 213 drives the gear 209 to rotate, so that the rack 1088 drives the second scraper 1085 and the first scraper 1086 to move along the upper surfaces of the second filter plate 1082 and the first filter plate 1083 respectively, and the filter residues on the second filter plate 1082 and the first filter plate 1083 are scraped off to the first inclined platform 203 and the second inclined platform 202, and then flow into the collection frame 206 through the first inclined platform 203 and the second inclined platform 202 for collection, and after the second filter plate 1082 and the first filter plate 1083 are cleaned, they are reset;

[0055] S3: The NMP waste liquid in the storage barrel 103 is transported to the dehydration mechanism 3 by the first connecting pipe 118 for primary dehydration. After the NMP waste liquid enters the dehydration mechanism 3, the heating mechanism 306 heats the liquid in the dehydration mechanism 3, and the water vapor is discharged by the heating mechanism 306. After the initial dehydration is completed, the waste liquid in the NMP waste liquid enters the distillation tower 4 through the second connecting pipe 304 for distillation. Some viscous waste liquid will remain on the bottom and side walls of the dehydration mechanism 3. The steps for processing these viscous substances are as follows: the rotating block 311 is driven to rotate by the fifth motor. When the rotating block 311 rotates, the scraping box 309 and the arc scraper 310 rotate synchronously. The scraping box 309 scrapes the bottom of the dehydration tower 301, and the arc scraper 310 0 is fitted with the side wall of the dehydration tower 301, and the side wall of the dehydration tower 301 is scraped. The scraped viscous material will be collected in the rectangular collecting groove 307 for collection. Then the scraping box 309 is rotated to the top of the rectangular collecting groove 307, and the cylindrical pressure rod 319 is rotated to apply a downward force to the bending plate 316. The bending plate 316 will move downward, and the third scraper 314 fixedly connected thereto will also move downward accordingly. The third scraper 314 will eventually contact the bottom surface of the rectangular collecting groove 307, and then drive the second threaded rod 312 to rotate. The second threaded rod 312 will drive the third scraper 314 to slide in the rectangular collecting groove 307, and scrape the viscous material collected in the rectangular collecting groove 307 to the hollow tube 308 at one end, and then flow out through the hollow tube 308.

[0056] S4: The NMP waste liquid entering the distillation tower 4 is distilled by the distillation tower 4, and the NMP after distillation is condensed by the condenser 6. The condensed liquid enters the collection tower 5 for collection, and is finally discharged from the discharge port 8.

[0057] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A NMP distillation and purification device, characterized in that, The invention comprises a multi-stage filtering mechanism (1), a filter residue removal mechanism (2), a dehydration mechanism (3), a distillation tower (4) and a collection tower (5), wherein the multi-stage filtering mechanism (1) comprises a support platform (101), a storage barrel (103) is fixedly provided below the support platform (101), a filtering barrel (108) is slidably provided on the storage barrel (103), a grinding barrel (109) is detachably provided on the filtering barrel (108), and the filtering barrel (108) comprises a first filtering plate (1083) and a second filtering plate (1082), a first scraper (1086) and a second scraper (1085) are slidably disposed on the first filter plate (1083) and the second filter plate (1082), respectively, the first scraper (1086) and the second scraper (1085) are fixedly connected, the grinding barrel (109) comprises a rectangular outer shell plate (1091), a first cylindrical barrel (1096) is disposed in the rectangular outer shell plate (1091), and a grinding column (1098) is rotatably disposed in the first cylindrical barrel (1096); The dehydration mechanism (3) comprises a dehydration tower (301), a scraper box (309) is rotatably provided in the dehydration tower (301), an arc-shaped scraper (310) is fixedly provided on the scraper box (309), a third scraper (314) is slidably provided in the scraper box (309), and a rectangular collecting trough (307) is provided at the bottom end of the dehydration tower (301); The filter residue removal mechanism (2) comprises a first tilting platform (203) and a second tilting platform (202); The filter barrel (108) comprises a trapezoidal outer shell plate (1081), a first filter plate (1083) being fixedly provided on the hypotenuse of the trapezoidal outer shell plate (1081), a second filter plate (1082) being fixedly provided on the right-angle side of the trapezoidal outer shell plate (1081) corresponding to the hypotenuse, wherein the size of the second filter plate (1082) is larger than the surface size of the corresponding right-angle side, i.e., the second filter plate (1082) is extended beyond the trapezoidal outer shell plate (1081) on all sides, a circle of slots (1084) being provided on the second filter plate (1082), the slots (1084) being U-shaped, and the first filter plate (1083) being fixedly provided with a second filter plate (1083). A first scraper (1086) is slidably provided on the upper surface, and a second scraper (1085) is slidably provided on the second filter plate (1082), wherein the second scraper (1085) is fixedly connected to the first scraper (1086) via a connecting rod (1087), a slot (1089) is provided on the second filter plate (1082), the connecting rod (1087) slides in the slot (1089), a rack (1088) is fixedly provided on the connecting rod (1087), and a through groove (10810) is also provided at the opening of the slot (1089) on one side of the second filter plate (1082); The grinding barrel (109) comprises a rectangular outer shell plate (1091), a trapezoidal plug plate (1092) is fixedly provided on one side of the rectangular outer shell plate (1091), a rectangular plate (10910) is fixedly provided inside the rectangular outer shell plate (1091), a first cylindrical barrel (1096) is fixedly provided on the rectangular plate (10910), a plurality of leakage holes (1097) are provided at the bottom end of the first cylindrical barrel (1096), a second cylindrical barrel (1095) is fixedly provided on the first cylindrical barrel (1096), a liquid inlet pipe (1093) is connected to the second cylindrical barrel (1095), and a third motor is fixedly provided on the top end of the second cylindrical barrel (1095). (1094), a grinding column (1098) is provided in the first cylindrical tube (1096), a long rotating shaft (1099) is fixedly provided on the grinding column (1098), the long rotating shaft (1099) and the grinding column (1098) are fixed and coaxially connected, the output end of the third motor (1094) is fixedly connected to the long rotating shaft (1099), the third motor (1094) works to realize the long rotating shaft (1099) driving the grinding column (1098) to rotate to realize the crushing function, the bottom end of the first cylindrical tube (1096) passes through the rectangular plate (10910), and the first cylindrical tube (1096) and the second cylindrical tube (1095) are both hollow inside.

2. A NMP distillation and purification device according to claim 1, characterized in that, A first supporting foot (102) is fixedly provided at the bottom end of the support platform (101), a plurality of first liquid outlets (104) are provided on the side of the storage barrel (103), a connecting tube (105) is also fixedly provided above the support platform (101), the connecting tube (105) and the storage barrel (103) are connected as a whole, both are fixed on the support platform (101), and both have a hollow structure inside, a first mounting plate (106) is provided on the outside of the top end of the connecting tube (105), a side plate (107) is fixedly provided on the first mounting plate (106), a filter barrel (108) is slidably provided inside the side plate (107), a grinding barrel (109) is detachably connected above the filter barrel (108), a water storage tank (119) is provided inside the storage barrel (103), a first connecting pipe (118) is connected to the water storage tank (119), and the other end of the first connecting pipe (118) is connected to the dehydration mechanism (3).

3. A NMP distillation and purification device according to claim 2, characterized in that, A mounting base (110) is fixedly provided next to the support platform (101), mounting brackets (111) are fixedly provided on both sides of the mounting base (110), a first threaded rod (112) is rotatably provided between the mounting brackets (111) on both sides, and a limit rod (113) is fixedly provided, wherein one end of the first threaded rod (112) is connected to a first motor (115), the first motor (115) and the mounting bracket (111) are fixedly connected, a connecting block (114) is threadedly matched on the first threaded rod (112), the connecting block (114) is fixedly connected to the filter barrel (108), and the connecting block (114) is slidably connected to the limit rod (113), and a plurality of telescopic cylinders (116) are fixedly provided on the mounting base (110), the output ends of the plurality of telescopic cylinders (116) are fixedly connected to a connecting plate (117), and the connecting plate (117) is fixedly connected to the grinding barrel (109).

4. A NMP distillation and purification device according to claim 3, characterized in that, A bottom bracket (302) is fixedly provided at the bottom end of the dehydration tower (301), and a plurality of second supporting legs (303) are fixedly provided on the bottom bracket (302). A heating mechanism (306) is also fixedly provided inside the bottom end of the dehydration tower (301), and the heating mechanism (306) is used to heat the inside of the dehydration tower (301). A first connecting pipe (118) is connected to the upper position of the dehydration tower (301). A hollow pipe (308) is fixedly provided at one end of the rectangular collecting tank (307), and the bottom of the hollow pipe (308) passes through the dehydration tower (301) and is located outside the dehydration mechanism (3). A second connecting pipe (304) is also connected to the lower end of the dehydration tower (301), and the second connecting pipe (304) is connected to the distillation tower (4). An exhaust mechanism (305) is also fixedly provided at the top of the dehydration tower (301).

5. A NMP distillation and purification device according to claim 4, characterized in that, The scraper box (309) is provided with a movable groove inside, and the movable groove runs through the upper and lower ends of the scraper box (309). A second threaded rod (312) is rotatably provided in the movable groove inside the scraper box (309). The second threaded rod (312) is threadedly matched with a slide bracket (313). One end of the second threaded rod (312) is connected to a fourth motor, and the fourth motor drives the second threaded rod (312) to rotate. The slide bracket (313) is slidably connected to the scraper box (309). A top plate (321) is fixedly provided on the slide bracket (313). A spring (322) is fixedly provided at the bottom end of the top plate (321). A bending plate (316) is fixedly connected to the end of the spring (322). The bending plate (316) is slidably connected to the slide bracket (313). A third scraper (314) is fixedly provided on the upper side of the bending plate (316), a limiting plate (315) is also fixedly provided on the upper side of the bending plate (316), an L-shaped limiting groove (320) is provided on the side of the scraping box (309), a rotating block (311) is rotatably provided at the middle position of the bottom of the dehydration tower (301), the rotating block (311) is fixedly connected to the scraping box (309), a rectangular block (317) is fixedly provided on the rotating block (311), two rotating rods (318) are rotatably provided on the rectangular block (317), a cylindrical pressure rod (319) is rotatably provided between the two rotating rods (318), and the cylindrical pressure rod (319) is located above the bending plate (316), and the rotating block (311) can be driven by a fifth motor, and the fifth motor is fixedly installed at the bottom position of the dehydration tower (301).

6. A NMP distillation and purification device according to claim 5, characterized in that, The filter residue removal mechanism (2) comprises a vertical plate (201) fixedly provided next to the multi-stage filtering mechanism (1), a first inclined platform (203) fixedly provided on the vertical plate (201), a second inclined platform (202) fixedly provided on the vertical plate (201) above the first inclined platform (203), a rectangular through-groove (205) provided between the first inclined platform (203) and the second inclined platform (202) on the vertical plate (201), a long blocking bar (204) provided on both the first inclined platform (203) and the second inclined platform (202), a collecting frame (206) fixedly provided on the back of the vertical plate (201) below the rectangular through-groove (205), and a filter residue removal mechanism (201) fixedly provided next to the vertical plate (201). A fixed bracket (208) is fixedly provided, a cylindrical rod (207) is rotatably provided on the fixed bracket (208), a gear (209) is fixedly provided at the top of the cylindrical rod (207), a first pulley (210) is provided at the rotatable connection between the cylindrical rod (207) and the fixed bracket (208), the first pulley (210) is fixedly connected to the cylindrical rod (207) and rotates coaxially, a second pulley (211) is also rotatably provided on the fixed bracket (208), the first pulley (210) and the second pulley (211) are connected via a belt (212), a second motor (213) is connected to the second pulley (211), and the second motor (213) is fixedly connected to the fixed bracket (208).

7. A NMP distillation and purification device according to claim 6, characterized in that, The dehydration mechanism (3) is connected to the distillation tower (4) via a second connecting pipe (304); the distillation tower (4) is further provided with a third connecting pipe (7); a condenser (6) is installed on the third connecting pipe (7); the other end of the third connecting pipe (7) is connected to a collection tower (5); and a discharge port (8) is provided on the collection tower (5).

8. The purification process of the NMP distillation purification device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1: First, NMP waste liquid containing impurities is input into the second cylindrical barrel (1095) through the liquid inlet pipe (1093), and the grinding column (1098) in the first cylindrical barrel (1096) is driven by the third motor (1094) to rotate to break up large-sized agglomerated particles in the NMP waste liquid. The broken agglomerated particles are passed through the leakage hole (1097) with the waste liquid into the filter barrel (108) for multi-stage filtration; S2: After the NMP waste liquid enters the filter barrel (108), it first passes through the second filter plate (1082) to perform primary filtration on the solid impurities in the NMP waste liquid. The filtered liquid enters the first filter plate (1083) for secondary filtration. The filtrate after multi-stage filtration enters the storage barrel (103) for storage. The filter residue remaining on the first filter plate (1083) and the second filter plate (1082) is processed through the following steps: first, the grinding barrel (109) is lifted upward as a whole by extending the telescopic cylinder (116). At this time, the trapezoidal plug plate (1092) on the grinding barrel (109) is pulled out of the through groove (10810), and the filter barrel (108) is in an exposed state. Then, The first motor (115) drives the filter barrel (108) to move horizontally until the rack (1088) on the filter barrel (108) contacts and meshes with the gear (209), and the second motor (213) drives the gear (209) to rotate, so that the rack (1088) drives the second scraper (1085) and the first scraper (1086) to move along the upper surfaces of the second filter plate (1082) and the first filter plate (1083) respectively, and the filter residue on the second filter plate (1082) and the first filter plate (1083) is scraped off onto the first inclined platform (203) and the second inclined platform (202), and then flows into the collection frame (206) through the first inclined platform (203) and the second inclined platform (202) for collection, and after the second filter plate (1082) and the first filter plate (1083) are cleaned, they are reset; S3: The NMP waste liquid in the storage barrel (103) is transported to the dehydration mechanism (3) through the first connecting pipe (118) for primary dehydration. After the NMP waste liquid enters the dehydration mechanism (3), the heating mechanism (306) heats the liquid in the dehydration mechanism (3), and water vapor is discharged from the heating mechanism (306). After the primary dehydration is completed, the waste liquid in the NMP waste liquid enters the distillation tower (4) through the second connecting pipe (304) for distillation. Some viscous waste liquid will remain on the bottom and side walls of the dehydration mechanism (3). The steps for processing these viscous substances are as follows: the rotating block (311) is driven to rotate by the fifth motor. When the rotating block (311) rotates, the scraper box (309) and the arc scraper (310) rotate synchronously. The scraper box (309) scrapes the bottom of the dehydration tower (301), and the arc scraper (310) The scraper box (309) is fitted with the side wall of the dehydration tower (301) to scrape the side wall of the dehydration tower (301). The scraped viscous material is collected in the rectangular collecting trough (307) for collection. The scraper box (309) is then rotated to the top of the rectangular collecting trough (307). The cylindrical pressure rod (319) is rotated to apply a downward force to the bending plate (316). The bending plate (316) moves downward, and the third scraper (314) fixedly connected thereto also moves downward. The third scraper (314) eventually contacts the bottom surface of the rectangular collecting trough (307). The second threaded rod (312) is then driven to rotate. The second threaded rod (312) drives the third scraper (314) to slide in the rectangular collecting trough (307), and the viscous material collected in the rectangular collecting trough (307) is scraped to the hollow tube (308) at one end, and then flows out through the hollow tube (308). S4: The NMP waste liquid entering the distillation tower (4) is distilled in the distillation tower (4), and the NMP after distillation is condensed in the condenser (6). The condensed liquid enters the collection tower (5) for collection, and is finally discharged from the discharge port (8).

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