N-methylpyrrolidone recovery equipment and recovery method based on wastewater treatment

Abstract

The invention discloses an N-methylpyrrolidone recovery device based on wastewater treatment and a recovery method thereof, and relates to the field of wastewater recovery treatment. The technical scheme mainly comprises a support frame, which is a vertical gantry support structure as a whole; and side connecting plates are fixedly installed at the middle positions on both sides of the inner wall thereof, and a recovery bucket is fixedly installed on the inner side of the side connecting plates, and a retention mechanism and a water production mechanism are sequentially arranged at the bottom of the recovery bucket from top to bottom. By means of a double-sided scraping and washing mechanism arranged at the upper and lower sides of a circular ring frame, the design similar to an I-shaped structure is utilized, so that not only the retention end on the upper surface of a filter membrane block can be cleaned separately, but also the water outlet end at the bottom of the filter membrane block can be cleaned separately, and the two cleaning ends do not interfere with each other, can be scrubbed synchronously during cleaning work, and can also be synchronously stacked at the position of a cavity separation box on each side of the circular ring frame when not working, so as not to interfere with the filter membrane blocks on each side.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater recovery and treatment, and more specifically, to an N-methylpyrrolidone recovery device based on wastewater treatment and a recovery method thereof. Background Art

[0002] In modern industrial production, especially in industries such as battery manufacturing, pharmaceuticals, pesticide production and coatings, a large amount of wastewater is generated. These wastewaters often contain various organic and inorganic pollutants. If they are discharged directly without treatment, they will cause serious pollution to the environment. N-methylpyrrolidone is a representative of organic pollutants. However, N-methylpyrrolidone is different from other pollutants. It is also a widely used organic solvent with a relatively high price. Therefore, in industrial production, it is not simply filtered out, but recycled.

[0003] There are various existing methods for recovering N-methylpyrrolidone. For small-scale recovery lines, there are distillation, adsorption and extraction methods. For large-scale production needs, membrane separation equipment is generally used for membrane separation, filtration and recovery. The pretreated wastewater will enter the membrane separation device by pumping and other methods. In the membrane separation device, water and other small molecules will selectively pass through the membrane according to the pore size of the membrane, while N-methylpyrrolidone will be concentrated on the other side of the membrane and intercepted for recovery.

[0004] However, after long-term use of the recovery equipment, the membrane layer used to intercept N-methylpyrrolidone may be contaminated, resulting in a decrease in membrane flux. Therefore, the membrane needs to be chemically or physically cleaned regularly to restore its separation performance. In actual operation, the feed side of the membrane needs to concentrate N-methylpyrrolidone, so organic matter such as NMP and other organic impurities will accumulate, but the other side will accumulate inorganic matter such as minerals, salts, etc. because it is used for effluent. Therefore, the dirt and impurities on both sides of the membrane are different. However, the existing technology does not adopt different cleaning strategies for the two sides of the membrane, which makes it difficult to deeply restore the activity of the interception membrane layer at the recovery end, which affects the recovery efficiency over time. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an N-methylpyrrolidone recovery device and a recovery method based on wastewater treatment, aiming to solve the above technical problems.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An N-methylpyrrolidone recovery device based on wastewater treatment, comprising a support frame, wherein the support frame is a vertical gantry support structure as a whole; and side connecting plates are fixedly installed at the middle positions of both sides of the inner wall, and a recovery barrel is fixedly installed on the inner side of the side connecting plate, and the bottom of the recovery barrel is sequentially provided with an interception mechanism and a water production mechanism from top to bottom;

[0008] The interception mechanism includes a circular frame, and the inner circle of the circular frame is arranged in a circular manner and is sequentially provided with four extrusion modules; and the inner circle of the circular frame is divided into four fan-shaped insertion slots by the four extrusion modules, and the fan-shaped insertion slots are sealed and inserted with filter membrane blocks, and the water production mechanism includes a water production barrel fixedly installed at the bottom of the circular frame, so as to cooperate with the filter membrane block to intercept N-methylpyrrolidone in the interior of the recovery barrel and discharge water into the water production barrel;

[0009] Among them, a double-sided scraping mechanism is arranged at the axial position of the circular frame, and the double-sided scraping mechanism includes a second scraping module placed in a recovery barrel for scraping the upper surface of the filter membrane block; and a first scraping module placed in a water production barrel for scraping the lower surface of the filter membrane block, the first scraping module and the second scraping module both include a negative pressure airbag bag that injects suitable cleaning reagents into the recovery barrel and the water production barrel respectively; and a scraping plate that cooperates with the cleaning reagent to perform cleaning in an immersion environment.

[0010] As a further solution of the present invention: the extrusion module includes a cavity separation box; and the cavity separation boxes on each side are connected and corresponding, the cavity separation box is provided with a reserved sleeve at the position of the axial intersection end of the circular frame, and the cavity interior of the cavity separation box is fixedly installed with two airbag blocks, one above and one below, and the airbag block on the upper side expands and unfolds toward the recovery barrel side; and the airbag block on the lower side expands and unfolds toward the water production barrel side; and a first magnetic attraction plate is fixedly installed on the outward expansion and unfolding surface of each side, the circular frame; and the airbag blocks in the cavity separation boxes on each side of the circular frame are connected to each other for centralized and synchronous inflating, an external air injection pipe is fixedly installed on the outer circular edge of the circular frame, and the external air injection pipe is connected to the airbag block in the cavity separation box on one side, and a servo air injection module whose output end is connected to the external air injection pipe is fixedly installed on the outer side of the support frame.

[0011] As a further solution of the present invention: the bilateral scraping mechanism also includes a cavity cylinder movably installed in the reserved sleeve; and corresponding sealing rings are arranged on the outer surface of the cavity cylinder and in the inner wall of the reserved sleeve, and the second scraping module has the same overall structure as the first scraping module; and is arranged symmetrically up and down; the second scraping module is fixedly installed on the upper side of the cavity cylinder, and the first scraping module is fixedly installed on the lower side of the cavity cylinder, and the second scraping module includes a transverse rotating plate, and the transverse rotating plate as a whole is a cavity shell structure extending equidistantly to both sides with the center of the cavity cylinder as the axis; and the overall length of the transverse rotating plate is the same as the diameter of the circular frame, and a plurality of injection ports are opened on the upper surface of each side of the transverse rotating plate; and a one-way rubber valve head is fixedly installed at the bottom of each injection port, and negative pressure airbags corresponding to the bottom of the one-way rubber valve head are arranged at the bottom of both sides of the transverse rotating plate; and the two negative pressure airbags are fixedly connected to the corresponding T-shaped connecting hoses at the position close to the axis of the transverse rotating plate.

[0012] As a further solution of the present invention: the bottom of the T-shaped connecting hose of the second scraping and washing module passes through the cavity of the cavity cylinder into the cavity of the horizontal turning plate of the bottom first scraping and washing module; and passes outward through the side surface at the bottom axis position of the horizontal turning plate in the first scraping and washing module; and the T-shaped connecting hose configured in the first scraping and washing module also passes outward from the side surface at the bottom axis position thereof, and the bilateral scraping and washing mechanism also includes an extension bracket fixedly installed at the outer side edge position of the water production barrel, and two groups of storage boxes are fixedly installed on the outer surface of the extension bracket; and a first hose is connected to the bottom of each group of storage boxes; and the first hose on each side passes into the interior of the water production barrel and is respectively connected to the two groups of T-shaped connecting hoses.

[0013] As a further solution of the present invention: a scraping plate is fixedly installed on the surface of the negative pressure airbag bag in the second scraping and washing module and the first scraping and washing module on the side close to the circular frame; and the scraping plates on the upper and lower sides are respectively fitted with the upper and lower surfaces of the filter membrane block, and second magnetic plates are fixedly installed on both sides of the scraping plates, and the second magnetic plates are adsorbed correspondingly to the first magnetic plates, and magnetic frames are fixedly installed at the upper and lower edge positions of the frame openings of the cavity separation box; and the magnetic frames on each side are adsorbed correspondingly to the outer edge of the first magnetic plate on the same side, and the bottom of the water production barrel is fixedly connected to a water pumping conduit connected to an external pump.

[0014] As a further solution of the present invention: a servo motor is fixedly installed at the inner top position of the support frame, a reciprocating threaded rod is fixedly installed on the bottom output end of the servo motor, a F-shaped hanger is meshingly installed on the outer surface of the reciprocating threaded rod, a sealing extrusion cover is fixedly connected to the bottom of the F-shaped hanger, and the sealing extrusion cover is slidably installed up and down inside the recycling barrel; and corresponding sealing rubber layers are arranged on the sliding contact ends of the sealing extrusion cover and the recycling barrel, a material injection conduit is fixedly connected to the upper surface of the sealing extrusion cover, and a plurality of groups of metal fins are fixedly installed on the lower surface of the sealing extrusion cover.

[0015] As a further solution of the present invention: a linkage mechanism is also installed on the side of the support frame, and the linkage mechanism includes a first gear sleeve fixedly installed at the upper side of the reciprocating threaded rod, and also includes a side wing plate fixedly installed at the lower end of the outer side surface of the recovery barrel, and a first linkage rod is movably installed on the surface of the side wing plate, and a second gear sleeve corresponding to and flush with the first gear sleeve is fixedly installed on the top of the first linkage rod; and the second gear sleeve is meshed with the outer surface of the first gear sleeve to form a first crawler.

[0016] As a further solution of the present invention: a fourth gear sleeve is movably installed at the bottom axis position of the water producing barrel, a second linkage rod corresponding to the fourth gear sleeve axis is movably installed at the inner bottom axis position of the water producing barrel, and the upper side of the second linkage rod is fixedly connected to the bottom axis position of the transverse rotating plate of the first scraping and washing module.

[0017] As a further solution of the present invention: the bottom end of the first linkage rod is fixedly connected with a third gear sleeve which is flush with and corresponds to the fourth gear sleeve; and the outer surfaces of the third gear sleeve and the fourth gear sleeve are meshed with a second crawler.

[0018] The recovery method of N-methylpyrrolidone recovery equipment based on wastewater treatment comprises the following steps:

[0019] S1: First, different cleaning reagents are injected into two sets of storage boxes according to needs, and are respectively introduced into the first scraping and washing module and the second scraping and washing module on different sides through a first hose;

[0020] S2: Then, the airbag blocks on each side of the servo gas injection module are raised to cooperate with the rotating bilateral scraping mechanism to squeeze out the reagent in the negative pressure airbag bag;

[0021] S3: Finally, the double-sided scraping and cleaning mechanism continues to rotate in cooperation with the scraping plate to perform scraping and cleaning, so as to separate and align the two sides of the filter membrane block to complete separate deep cleaning.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By configuring the double-sided scraping and washing mechanism at the upper and lower sides of the circular frame, using its I-shaped design, during the working process, not only the upper surface interception end of the filter membrane block can be cleaned separately, but also the bottom water outlet end of the filter membrane block can be cleaned separately. The two cleaning ends do not interfere with each other and can be scrubbed synchronously during cleaning work. When not working, they can also be synchronously stacked at the position of the cavity separation box on each side of the circular frame without interfering with the filter membrane blocks on each side.

[0024] 2. Through the air bag blocks that are interconnected in the cavity separation box, after the external servo air injection module has been air-injected, the outward expansion and unfolding characteristics of the air bag blocks can be utilized to make the upper and lower ends of the cavity separation box protrude outward and upward. When the bilateral scraping and washing mechanism passes through this position, its negative pressure air bag bag is squeezed by the protruding position, and the reagent stored in the bag can be squeezed out. The extrusion ends of the two groups of negative pressure air bag bags are separated from each other. By storing the cleaning reagents used at different ends in the outer storage box, a corresponding cleaning environment can be formed, thereby further improving the cleaning effect of different filter surfaces on both sides of the filter membrane block, and further increasing the subsequent recovery and retention effect of the device.

[0025] 3. Through the scraping plate configured on the end face of the negative pressure airbag bag of the bilateral scraping and washing mechanism, during the rotation of the servo, not only can the cleaning reagent be sprayed out in an orderly manner, but it can also be scrubbed in combination with the reagent, further improving the cleaning effect of different filter surfaces on both sides of the membrane block, so as to improve the recovery and retention effect of the membrane surface, and cooperate with the squeezing effect of the sealing squeezing cover at the output end of the upper servo motor and the extraction effect of the bottom water pumping conduit to form a channel with stronger interception and recovery effect, so as to further increase the recovery effect.

[0026] 4. The servo motor drives the sealing extrusion cover to extrude back and forth to provide a stronger peeling force. At the same time, it can also drive the linkage mechanism on the side to rotate the fourth gear sleeve at the bottom to control the second linkage rod to drive the double-sided scraping and washing mechanism to work, so that the cleaning end does not need to be configured with additional driving components, realizing the integration of cleaning function and boosting function, reducing the complexity and maintenance cost of the system, and improving the overall automation level and work efficiency. The servo motor only needs to accurately control the speed, torque and position, so that the extrusion force and speed of the sealing extrusion cover can be fine-tuned according to actual needs to achieve the best working effect and ensure the consistency and efficiency of the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is the overall structural diagram of the recycling equipment;

[0029] Figure 2 It is a structural schematic diagram of the water production mechanism and the filtration membrane block in the extracted state;

[0030] Figure 3 It is a schematic diagram of the structure of the recycling bin;

[0031] Figure 4 It is a structural schematic diagram of the interception mechanism in a partially split state;

[0032] Figure 5 It is a schematic diagram of the partial splitting effect of the bilateral scraping and washing mechanism;

[0033] Figure 6 It is a structural schematic diagram of the expansion effect of the air bag block;

[0034] Figure 7 It is a structural schematic diagram of the linkage mechanism in a semi-sectioned state;

[0035] Figure 8 for Figure 5 A schematic diagram of the enlarged structure at A in the middle;

[0036] Fig. 9 It is a schematic diagram of the structure of the sealing extrusion cover.

[0037] Reference numerals:

[0038] 1. Support frame; 2. Recycling bin; 3. Side connecting plate;

[0039] 4. Interception mechanism; 41. Ring frame;

[0040] 42. Extrusion module; 421. Cavity partition box; 422. Airbag block; 423. First magnetic plate; 424. External gas injection pipe; 425. Magnetic frame;

[0041] 43. fan-shaped insertion notch; 44. filter membrane block; 45. reserved sleeve opening;

[0042] 5. water production mechanism; 51. water production bucket; 52. expansion bracket; 53. storage box; 54. first hose;

[0043] 6. Servo motor; 7. Reciprocating threaded rod; 8. F-shaped hanger; 9. Metal wing strip; 10. Sealing extrusion cover; 11. Injection conduit;

[0044] 12. linkage mechanism; 121. first gear sleeve; 122. first linkage rod; 123. second gear sleeve; 124. first crawler belt; 125. third gear sleeve; 126. fourth gear sleeve; 127. second crawler belt; 128. second linkage rod;

[0045] 13. Servo gas injection module; 14. Water pumping conduit;

[0046] 15. Double-sided scraping and washing mechanism; 151. Cavity cylinder; 152. Horizontal rotating plate; 153. One-way rubber valve head; 154. Negative pressure airbag; 155. Injection port; 156. T-shaped connecting hose; 157. First scraping and washing module; 158. Scraping plate; 159. Second magnetic suction plate; 1510. Second scraping and washing module;

[0047] 16. Side wing panels. DETAILED DESCRIPTION

[0048] 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 making creative work are within the scope of protection of the present invention.

[0049] Reference Figures 1 to 9 The present invention further describes an N-methylpyrrolidone recovery device based on wastewater treatment and an embodiment of the recovery method thereof.

[0050] An N-methylpyrrolidone recovery device based on wastewater treatment, comprising a support frame 1, wherein the support frame 1 is a vertical gantry support structure as a whole; and side connecting plates 3 are fixedly installed at the middle positions on both sides of the inner wall thereof, and a recovery barrel 2 is fixedly installed on the inner side of the side connecting plates 3, and the bottom of the recovery barrel 2 is sequentially provided with an interception mechanism 4 and a water production mechanism 5 from top to bottom;

[0051] The interception mechanism 4 includes a circular frame 41, and the inner circle of the circular frame 41 is arranged in a circumferential manner and is sequentially provided with four extrusion modules 42; and the inner circle of the circular frame 41 is divided into four fan-shaped insertion slots 43 by the four extrusion modules 42, and the fan-shaped insertion slots 43 are all sealed and inserted with filter membrane blocks 44. The water production mechanism 5 includes a water production barrel 51 fixedly installed at the bottom of the circular frame 41, so as to cooperate with the filter membrane block 44 to intercept N-methylpyrrolidone in the interior of the recovery barrel 2 and discharge water into the water production barrel 51;

[0052] Among them, a double-sided scraping mechanism 15 is arranged at the axial position of the circular frame 41, and the double-sided scraping mechanism 15 includes a second scraping module 1510 placed in the recovery barrel 2 for scraping the upper surface of the filter membrane block 44; and a first scraping module 157 placed in the water production barrel 51 for scraping the lower surface of the filter membrane block 44, the first scraping module 157 and the second scraping module 1510 both include a negative pressure airbag bag 154 for injecting suitable cleaning reagents into the recovery barrel 2 and the water production barrel 51 respectively; and a scraping plate 158 for cleaning in an immersion environment in cooperation with the cleaning reagent.

[0053] In view of the problem that different dirt and impurities on both sides of the N-methylpyrrolidone retention membrane layer in the recovery equipment cannot be treated with differentiated cleaning strategies to deeply restore the activity of the membrane layer and improve the recovery efficiency, the above-mentioned technical solution is now adopted to solve the problem. The above-mentioned technical solution is mainly composed of a support frame 1, a recovery barrel 2, a water production barrel 51, a retention mechanism 4 and a bilateral scraping and washing mechanism 15, wherein the support frame 1 is used as a supporting member of the device, and mainly plays a supporting role in each mechanism. The configured recovery barrel 2 and water production barrel 51 are both transparent cover tube structures resistant to chemical corrosion in the prior art. The wastewater containing N-methylpyrrolidone enters the interior of the recovery barrel 2, and is retained in cooperation with the retention mechanism 4, so that the concentrated N-methylpyrrolidone is retained in the interior of the recovery barrel 2, and the extra water is squeezed into the water production barrel 51 at the bottom to achieve The recovery of N-methylpyrrolidone is now carried out, and the bilateral scraping mechanism 15 corresponding to the axial end of the interception mechanism 4 is composed of a first scraping module 157 and a second scraping module 1510. The first scraping module 157 and the second scraping module 1510 have the same overall structure. The active end of the second scraping module 1510 is located inside the recovery barrel 2, and is used to separately clean the upper surface of the filter membrane block 44 at the interception end, while the active end of the first scraping module 157 is located inside the water production barrel 51, and is used to separately clean the lower surface of the filter membrane block 44 at the interception end. It can clean the organic matter on the feed side of the membrane layer and the inorganic matter on the water outlet end of the membrane layer, so as to solve the problem that the existing recovery equipment cannot adopt differentiated cleaning strategies to deeply restore the activity of the membrane layer and improve the recovery efficiency.

[0054] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6As shown, the extrusion module 42 includes a cavity separation box 421; and the cavity separation boxes 421 on each side are connected and corresponding, and the cavity separation box 421 is provided with a reserved sleeve 45 at the position of the axis intersection end of the circular frame 41, and two airbag blocks 422 are fixedly installed in the cavity of the cavity separation box 421, one above and one below, and the upper airbag block 422 expands and unfolds toward the side of the recovery barrel 2; and the lower airbag block 422 expands and unfolds toward the side of the water production barrel 51; and each side expands and unfolds outwards A first magnetic attraction plate 423 is fixedly installed on the open surface, and the circular frame 41; and the airbag blocks 422 in the cavity separation box 421 on each side of the circular frame 41 are connected to each other for centralized and synchronous inflating, and an external gas injection pipe 424 is fixedly installed on the outer circular edge of the circular frame 41, and the external gas injection pipe 424 is connected to the airbag block 422 in the cavity separation box 421 on one side, and a servo gas injection module 13 whose output end is connected to the external gas injection pipe 424 is fixedly installed on the outer side edge of the support frame 1.

[0055] Among them, the configured filter membrane block 44 is installed in the fan-shaped insertion groove 43 on each side by bolts on the outer side, and a convex plate for easy taking is also arranged on the outermost side. The membrane layer of the filter membrane block 44 is an ultrafiltration membrane layer or a nanofiltration membrane layer that can intercept N-methylpyrrolidone in the prior art. The air bag block 422 configured in the cavity separation box 421 on each side is divided into an upper and lower side bag blocks, both of which are corrosion-resistant cavity bag block structures that can be expanded by inflation and contracted by vacuuming in the prior art. The configured servo injection module 13 is an injection end for inflating the cavity bag block, and is accurately inflated and vacuumed through the configured servo module.

[0056] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6As shown, the bilateral scraping and washing mechanism 15 also includes a cavity cylinder 151 movably installed in the reserved sleeve 45; and corresponding sealing rings are arranged on the outer surface of the cavity cylinder 151 and the inner wall of the reserved sleeve 45, and the second scraping and washing module 1510 has the same overall structure as the first scraping and washing module 157; and they are arranged symmetrically up and down; the second scraping and washing module 1510 is fixedly installed on the upper side of the cavity cylinder 151, and the first scraping and washing module 157 is fixedly installed on the lower side of the cavity cylinder 151, and the second scraping and washing module 1510 includes a horizontal rotating plate 152, and the horizontal rotating plate 152 is integrally formed with a cavity cylinder The center of the circle of the cylinder 151 is a hollow shell structure extending equidistantly to both sides from the axis; and the overall length of the transverse rotating plate 152 is the same as the diameter of the circular frame 41, and a plurality of injection ports 155 are provided on the upper surface of each side of the transverse rotating plate 152; and a one-way rubber valve head 153 is fixedly installed at the bottom of each injection port 155, and negative pressure airbags 154 corresponding to the bottom of the one-way rubber valve head 153 are arranged at the bottom of both sides of the transverse rotating plate 152; and the two negative pressure airbags 154 are fixedly connected with corresponding T-shaped connecting hoses 156 at the position close to the axis of the transverse rotating plate 152.

[0057] Among them, the configured one-way rubber valve head 153 is a one-way valve head structure in the prior art, which can eject the reagent outward through the extrusion force and remain sealed when not under force. The negative pressure airbag bag 154 is a hollow bag structure in the prior art that can discharge the internal reagent outward under the action of extrusion and automatically reset and expand without the action of extrusion force. At the same time of automatic reset and expansion, the negative pressure generated by the reset will generate an adsorption force, thereby adsorbing supplementary reagent into it through the connected T-shaped connecting hose 156.

[0058] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 As shown, the bottom of the T-shaped connecting hose 156 of the second scraping and washing module 1510 passes through the cavity of the cavity cylinder 151 into the cavity of the horizontal rotating plate 152 of the bottom first scraping and washing module 157; and passes outward through the side at the bottom axis position of the horizontal rotating plate 152 in the first scraping and washing module 157; and the T-shaped connecting hose 156 configured in the first scraping and washing module 157 also passes outward from the side at the bottom axis position thereof, and the bilateral scraping and washing mechanism 15 also includes an extension bracket 52 fixedly installed at the outer side edge position of the water production barrel 51, and two groups of storage boxes 53 are fixedly installed on the outer surface of the extension bracket 52; and the bottom of each group of storage boxes 53 is connected to a first hose 54; and the first hose 54 on each side passes into the interior of the water production barrel 51 and is respectively connected to the two groups of T-shaped connecting hoses 156.

[0059] Among them, the storage boxes 53 configured on both sides can be injected with different cleaning reagents as needed. For example, for the feed side of the membrane, since N-methylpyrrolidone needs to be concentrated, organic matter such as NMP and other organic impurities will accumulate. For deep cleaning, it is necessary to use surfactants, such as non-ionic surfactants, to help remove organic matter, reduce interfacial tension, and prevent organic matter from depositing on the membrane surface. In the prior art, such reagents include but are not limited to ethanol, isopropanol, etc. For the water outlet side of the membrane, because it is the water production end, the dirt generated on this side is mainly inorganic stains such as minerals and salts, and an acidic solution can be used. Different cleaning agents can be injected according to different types of dirt to provide a more targeted cleaning environment.

[0060] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 8 As shown, a scraping plate 158 is fixedly installed on the surface of the negative pressure airbag bag 154 in the second scraping module 1510 and the first scraping module 157 close to the circular frame 41; and the scraping plates 158 on the upper and lower sides are respectively fitted with the upper and lower surfaces of the filter membrane block 44, and second magnetic plates 159 are fixedly installed on both sides of the scraping plate 158, and the second magnetic plates 159 are adsorbed and correspond to the first magnetic plates 423, and magnetic frames 425 are fixedly installed at the upper and lower edge positions of the frame openings of the cavity partition box 421; and the magnetic frames 425 on each side are adsorbed and correspond to the outer edge of the first magnetic plate 423 on the same side, and the bottom of the water production barrel 51 is fixedly connected to a water suction conduit 14 connected to an external suction pump.

[0061] The specific working process of the configured bilateral scraping and washing mechanism 15 is as follows:

[0062] First, different types of reagents are injected into the two sets of storage boxes 53 according to the needs to treat the dirt mainly composed of inorganic matter and mainly composed of organic matter on both sides of the membrane, and then the filter membrane block 44 is installed in the fan-shaped insertion slot 43 on each side of the circular frame 41 by bolts to separate the recovery barrel 2 and the water production barrel 51, and then the wastewater containing N-methylpyrrolidone is injected into the interior of the recovery barrel 2 for filtration. With the extraction action of the pump outside the water pumping conduit 14, the N-methylpyrrolidone passes through the filtration action of the filter membrane block 44, and the recovery barrel is separated. 2, the concentration of N-methylpyrrolidone inside is getting higher and higher, and the excess water and other substances enter the water production barrel 51 through the filter membrane block 44. At this time, the metal wing strips 9 at the bottom of the sealing and squeezing cover 10 are used to heat the inside of the recovery barrel 2 under the action of the externally configured heating module, and the concentrated NMP solution is heated by distillation to volatilize NMP, and then the pure NMP is absorbed and collected through the injection conduit 11. As the recovery work continues, different dirt will be generated on the upper and lower sides of the filter membrane block 44, which will affect the interception effect of the filter recovery end;

[0063] Then, through the rotation of the double-sided scraping and washing mechanism 15 movably installed in the reserved sleeve 45, the second scraping and washing module 1510 and the first scraping and washing module 157 on the double-sided scraping and washing mechanism 15 work synchronously respectively to deal with different dirt on the membrane surfaces on both sides, and the servo injection module 13 on the outside controls its output end to inject gas into the connected airbag block 422 on one side. Because the airbag blocks 422 on each side are connected to each other, the airbag blocks 422 at the upper and lower ends of the cavity partition box 421 on each side will expand and unfold outwards under the continuous inflation state to form corresponding convex ends. As the double-sided scraping and washing mechanism 15 continues to rotate as a whole, the negative pressure airbag bags 154 at the scraping and washing ends on each side are It will move to the position of the protruding end. Under the action of the extrusion of the protruding end, the negative pressure airbag 154 will be folded due to the extrusion, and the reagent stored inside it will be discharged outwards and injected into the recovery barrel 2 and the water production barrel 51 respectively. After the negative pressure airbag 154 moves out of the position of the protruding end, it will reset again due to its own characteristics and generate negative pressure. Through the connected T-shaped connecting hose 156 and the first hose 54, the reagent in the storage box 53 will be sucked into its cavity for self-replenishment, waiting for the next movement to the protruding end for extrusion. In addition, since the scraper plate 158 on the negative pressure airbag 154 is attached to the surface of the filter membrane block 44, it will also perform auxiliary scrubbing during the rotation process, and the cleaning is performed reciprocatingly in sequence.

[0064] Finally, because the filter membrane block 44 is a high-precision filter end, the cleaning reagent injected should not be excessive. When the internal concentration reaches a certain value, the servo gas injection module 13 can be used to pump air outward again to retract the raised airbag block 422. At this time, the rotating double-sided scraping mechanism 15 will only provide scrubbing, and will not inject reagents to ensure the stability of the cleaning environment. After the cleaning is completed, the wastewater can continue to be injected into the recovery barrel 2 through the injection conduit 11 for interception and recovery;

[0065] Among them, the first magnetic plate 423 configured on the airbag block 422 is adsorbed and corresponds to the second magnetic plate 159 on the negative pressure airbag bag 154, so that when the device is not working, its double-sided scraping and cleaning mechanism 15 can be stably folded on the upper surface of the cavity partition box 421, and the middle scraping plate 158 is sealed at the middle end through adsorption and bonding, thereby reducing the degree of contamination of the scraping plate 158. The side edge of the first magnetic plate 423 on the airbag block 422 is adsorbed and corresponds to the magnetic frame 425, so that when the airbag block 422 is retracted, the airbag block 422 folded therein can be relatively flat, thereby ensuring that the double-sided scraping and cleaning mechanism 15 continues to scrub stably.

[0066] like Figure 1 , Figure 3 , Figure 7 , Fig. 9 As shown, a servo motor 6 is fixedly installed at the inner top position of the support frame 1, a reciprocating threaded rod 7 is fixedly installed on the bottom output end of the servo motor 6, a F-shaped hanger 8 is meshingly installed on the outer surface of the reciprocating threaded rod 7, a sealing extrusion cover 10 is fixedly connected to the bottom of the F-shaped hanger 8, and the sealing extrusion cover 10 is slidably installed up and down inside the recycling barrel 2; and corresponding sealing rubber layers are arranged on the sliding contact ends of the sealing extrusion cover 10 and the recycling barrel 2, an injection conduit 11 is fixedly connected to the upper surface of the sealing extrusion cover 10, and a plurality of groups of metal fins 9 are fixedly installed on the lower surface of the sealing extrusion cover 10.

[0067] Among them, the several groups of metal fins 9 are components in the prior art that can be heated by heat conduction. A corresponding heating end is arranged on the outer side of the sealed extrusion cover 10, so that high temperature can be generated in the recovery barrel 2 sealed by the sealed extrusion cover 10 to complete the distillation work, and a corresponding servo pump is also arranged on the outer side of the connected injection pipe 11 to inject wastewater and remove distillate accordingly.

[0068] like Figure 1 , Figure 3 , Figure 7 , Fig. 9As shown, a linkage mechanism 12 is also installed on the side of the support frame 1, and the linkage mechanism 12 includes a first gear sleeve 121 fixedly installed at the upper side of the reciprocating threaded rod 7, and also includes a side wing plate 16 fixedly installed at the lower end of the outer side surface of the recovery barrel 2, and a first linkage rod 122 is movably installed on the surface of the side wing plate 16, and a second gear sleeve 123 corresponding to the first gear sleeve 121 is fixedly installed on the top end of the first linkage rod 122; and the second gear sleeve 123 is meshed with the outer surface of the first gear sleeve 121 and is sleeved with a first crawler 124.

[0069] like Figure 1 , Figure 3 , Figure 7 , Fig. 9 As shown, a fourth gear sleeve 126 is movably installed at the bottom axis position of the water producing barrel 51, and a second linkage rod 128 corresponding to the fourth gear sleeve 126 axis fixedly connected is movably installed at the inner bottom axis position of the water producing barrel 51, and the upper side of the second linkage rod 128 is fixedly connected to the bottom axis position of the transverse rotating plate 152 of the first scraping module 157.

[0070] like Figure 1 , Figure 3 , Figure 7 , Fig. 9 As shown, the bottom end of the first linkage rod 122 is fixedly connected with a third gear sleeve 125 which is flush with and corresponds to the fourth gear sleeve 126 ; and the outer surfaces of the third gear sleeve 125 and the fourth gear sleeve 126 are meshed with a second crawler 127 .

[0071] Among them, in order to further improve the concentration efficiency at one end of the recovery barrel 2, the reciprocating threaded rod 7 at the output end of the servo motor 6 can be used to control the four-shaped hanger 8 to drive the sealing extrusion cover 10 to reciprocate up and down, and further form a better stripping force inside the recovery barrel 2 through the extrusion force of the extrusion end, so as to further improve the separation and recovery efficiency. In the process of reciprocating extrusion of the sealing extrusion cover 10, its linkage mechanism 12 can also be linked. The specific process is as follows:

[0072] First, under the action of the first crawler 124 meshing with the outer side of the first gear sleeve 121 and the second gear sleeve 123, during the rotation of the reciprocating threaded rod 7, the first gear sleeve 121 will also drive the first linkage rod 122 to rotate, so that the third gear sleeve 125 rotates, and further drives the fourth gear sleeve 126 to rotate. The rotation of the fourth gear sleeve 126 can drive the second linkage rod 128 to rotate, so that the internal double-sided scraping mechanism 15 rotates, and the entire device is linked. The injected surfactant and pH adjuster are different from the strong acid and alkali in the pre-cleaning process due to their characteristics. They can be injected during the working process and are dynamic cleaning agents in the prior art. The cleaning agent solution circulates inside the membrane assembly to dynamically remove pollutants on the membrane surface to complete online cleaning.

[0073] The recovery method of N-methylpyrrolidone recovery equipment based on wastewater treatment comprises the following steps:

[0074] S1: First, different cleaning reagents are injected into the two storage boxes 53 according to the needs, and are respectively introduced into the first scraping and washing module 157 and the second scraping and washing module 1510 on different sides with the first hose 54;

[0075] S2: Then, the airbag blocks 422 on each side are raised by the servo air injection module 13 to cooperate with the rotating bilateral scraping mechanism 15 to squeeze out the reagent in the negative pressure airbag bag 154;

[0076] S3: Finally, the double-sided scraping and cleaning mechanism 15 continues to rotate and cooperates with the scraping plate 158 to perform scraping and cleaning, so as to separate and align the two sides of the filter membrane block 44 to complete separate deep cleaning.

[0077] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An N-methylpyrrolidone recovery device based on wastewater treatment, comprising a support frame (1), characterized in that: The support frame (1) is a vertical gantry support structure as a whole; side connecting plates (3) are fixedly installed at the middle positions of both sides of the inner wall; a recovery bucket (2) is fixedly installed on the inner side of the side connecting plate (3); and the bottom of the recovery bucket (2) is provided with a retaining mechanism (4) and a water production mechanism (5) in order from top to bottom; The interception mechanism (4) comprises a circular frame (41), the inner circle of the circular frame (41) is provided with four squeezing modules (42) arranged in a circular pattern in sequence; the inner circle of the circular frame (41) is divided into four fan-shaped insertion slots (43) by the four squeezing modules (42), and the fan-shaped insertion slots (43) are all sealed and inserted with filter membrane blocks (44); the water production mechanism (5) comprises a water production barrel (51) fixedly mounted on the bottom of the circular frame (41), so as to cooperate with the filter membrane block (44) to intercept N-methylpyrrolidone in the interior of the recovery barrel (2) and discharge water into the water production barrel (51); A bilateral scraping mechanism (15) is disposed at the axis position of the circular frame (41), and the bilateral scraping mechanism (15) comprises a second scraping module (1510) placed in the recovery barrel (2) for scraping the upper surface of the filter membrane block (44); and a first scraping module (157) placed in the water production barrel (51) for scraping the lower surface of the filter membrane block (44), wherein the first scraping module (157) and the second scraping module (1510) both comprise a negative pressure air bag (154) for injecting a suitable cleaning agent into the recovery barrel (2) and the water production barrel (51), respectively; and a scraping plate (158) for cleaning in an immersion environment in cooperation with the cleaning agent; The extrusion module (42) comprises a cavity separation box (421); and the cavity separation boxes (421) on each side are in communication with each other, and a reserved sleeve (45) is provided at the position of the axial intersection end of the circular frame (41) of the cavity separation box (421), and two airbag blocks (422) are fixedly installed in the cavity of the cavity separation box (421), one above and one below, and the upper airbag block (422) expands and unfolds toward the recovery barrel (2); and the lower airbag block (422) expands and unfolds toward the water production barrel (51); and the outward expansion surface of each side The first magnetic attraction plate (423) is fixedly installed on the circular frame (41); and the airbag blocks (422) in the cavity separation box (421) on each side of the circular frame (41) are communicated with each other to be centrally and synchronously inflated; an external air injection pipe (424) is fixedly installed on the outer circumferential edge of the circular frame (41); the external air injection pipe (424) is communicated with the airbag block (422) in the cavity separation box (421) on one side; and a servo air injection module (13) whose output end is communicated with the external air injection pipe (424) is fixedly installed on the outer side edge of the support frame (1); The bilateral scraping and washing mechanism (15) further comprises a hollow cylinder (151) movably mounted in the reserved sleeve (45); and corresponding sealing rings are arranged on the outer surface of the hollow cylinder (151) and in the inner wall of the reserved sleeve (45); the second scraping and washing module (1510) and the first scraping and washing module (157) have the same overall structure; and are arranged symmetrically from top to bottom; the second scraping and washing module (1510) is fixedly mounted on the upper side of the hollow cylinder (151), and the first scraping and washing module (157) is fixedly mounted on the lower side of the hollow cylinder (151); the second scraping and washing module (1510) comprises a transverse rotating plate (152), and the transverse rotating plate (152) is integrally formed with the hollow cylinder The center of the cylinder (151) is a hollow shell structure extending equidistantly from the axis to both sides; the overall length of the transverse rotating plate (152) is the same as the diameter of the circular frame (41); a plurality of injection ports (155) are provided on the upper surface of each side of the transverse rotating plate (152); a one-way rubber valve head (153) is fixedly installed at the bottom of each injection port (155); negative pressure airbags (154) corresponding to the bottom of the one-way rubber valve head (153) are arranged at the bottom of both sides of the transverse rotating plate (152); and two negative pressure airbags (154) are fixedly connected to corresponding T-shaped connecting hoses (156) at positions close to one side of the axis of the transverse rotating plate (152); The bottom of the T-shaped connecting hose (156) of the second scraping and washing module (1510) passes through the cavity of the cavity cylinder (151) and enters the cavity of the horizontal rotating plate (152) of the bottom first scraping and washing module (157); and passes outward through the side of the bottom axis position of the horizontal rotating plate (152) in the first scraping and washing module (157); and the T-shaped connecting hose (156) configured in the first scraping and washing module (157) also passes outward from the side of the bottom axis position. The double-sided scraping and washing mechanism (15) also includes an extension bracket (52) fixedly installed at the outer side of the water production barrel (51), and two groups of storage boxes (53) are fixedly installed on the outer surface of the extension bracket (52); and the bottom of each group of storage boxes (53) is connected to a first hose (54); and the first hose (54) on each side passes into the interior of the water production barrel (51) and is respectively connected to the two groups of T-shaped connecting hoses (156); A scraping plate (158) is fixedly mounted on the surface of the negative pressure airbag (154) in the second scraping and washing module (1510) and the first scraping and washing module (157) on the side close to the circular frame (41); the scraping plates (158) on the upper and lower sides are respectively fitted with the upper and lower surfaces of the filter membrane block (44); a second magnetic plate (159) is fixedly mounted on both sides of the scraping plate (158); the second magnetic plate (159) is adsorbed and corresponds to the first magnetic plate (423); magnetic frames (425) are fixedly mounted at the upper and lower frame edges of the cavity separation box (421); the magnetic frames (425) on each side are adsorbed and correspond to the outer edge of the first magnetic plate (423) on the same side; and a water pumping conduit (14) connected to an external pumping pump is fixedly connected to the bottom of the water production barrel (51).

2. The N-methylpyrrolidone recovery equipment based on wastewater treatment according to claim 1, characterized in that: A servo motor (6) is fixedly mounted at the inner top position of the support frame (1); a reciprocating threaded rod (7) is fixedly mounted on the bottom output end of the servo motor (6); a shaped hanger (8) is meshingly mounted on the outer surface of the reciprocating threaded rod (7); a sealing extrusion cover (10) is fixedly connected to the bottom of the shaped hanger (8); the sealing extrusion cover (10) is slidably mounted up and down inside the recovery barrel (2); and corresponding sealing rubber layers are arranged on the sliding contact ends of the sealing extrusion cover (10) and the recovery barrel (2); an injection conduit (11) is fixedly connected to the upper surface of the sealing extrusion cover (10); and a plurality of groups of metal fins (9) are fixedly mounted on the lower surface of the sealing extrusion cover (10).

3. The N-methylpyrrolidone recovery equipment based on wastewater treatment according to claim 2, characterized in that: A linkage mechanism (12) is also installed on the side of the support frame (1), and the linkage mechanism (12) comprises a first gear sleeve (121) fixedly installed at the upper side of the reciprocating threaded rod (7), and also comprises a side wing plate (16) fixedly installed at the lower end of the outer side surface of the recovery barrel (2), a first linkage rod (122) is movably installed on the surface of the side wing plate (16), a second gear sleeve (123) flush with the first gear sleeve (121) is fixedly installed at the top end of the first linkage rod (122); and a first crawler (124) is meshed with the outer surface of the second gear sleeve (123) and the first gear sleeve (121).

4. The N-methylpyrrolidone recovery equipment based on wastewater treatment according to claim 3, characterized in that: A fourth gear sleeve (126) is movably mounted at the bottom axis of the water production barrel (51), and a second linkage rod (128) fixedly connected to the axis of the fourth gear sleeve (126) is movably mounted at the inner bottom axis of the water production barrel (51), and the upper side of the second linkage rod (128) is fixedly connected to the bottom axis of the transverse rotating plate (152) of the first scraping and washing module (157).

5. The N-methylpyrrolidone recovery equipment based on wastewater treatment according to claim 4, characterized in that: The bottom end of the first linkage rod (122) is fixedly connected to a third gear sleeve (125) flush with and corresponding to the fourth gear sleeve (126); and the outer surfaces of the third gear sleeve (125) and the fourth gear sleeve (126) are meshed with a second crawler (127).

6. A method for recovering N-methylpyrrolidone based on a wastewater treatment device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1: First, different cleaning reagents are injected into two sets of storage boxes (53) according to needs, and are respectively introduced into the first scraping and washing module (157) and the second scraping and washing module (1510) on different sides through the first hose (54); S2: Then, the airbag blocks (422) on each side are raised by the servo air injection module (13) to cooperate with the rotating bilateral scraping mechanism (15) to squeeze out the reagent in the negative pressure airbag bag (154); S3: Finally, the double-sided scraping and cleaning mechanism (15) continues to rotate and cooperates with the scraping plate (158) to perform scraping and cleaning, so as to separate and align the two sides of the filter membrane block (44) to complete separate deep cleaning.

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