Wastewater treatment device and process in production of poly(lactic-co-glycolic acid)

Abstract

The present application relates to the poly lactic acid ethylene glycol ester production process in wastewater treatment purification technical field's poly lactic acid ethylene glycol ester production process in wastewater treatment device and process, including water pollution prevention and control environment's treatment pipe, rotating rod and first movable plate, second movable plate and multiple stirring rods, adjusting part for adjusting the interval between the first movable plate and the second movable plate is slidably connected with the end of the rotating rod, the stirring ring is movably inserted in the edge of the second movable plate through the elastic member, the stirring rod is movably located in the stirring ring, the second movable plate is slidably fitted with the sliding rod connected with the adjusting part.The first movable plate and the second movable plate are driven to move away from or close to each other, while the stirring ring and the stirring rod make circular motion and diffusion-contraction motion in the wastewater treatment pipe.This multi-dimensional and multi-level stirring method greatly improves the mixing efficiency of wastewater and neutralizing agent, promotes the full progress of neutralization reaction, and effectively purifies the wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wastewater treatment and purification in the production process of polylactic acid ethylene glycol ester, in particular to a wastewater treatment device and process in the production process of polylactic acid ethylene glycol ester. BACKGROUND

[0002] In the production process of polylactic acid ethylene glycol ester (usually refers to a biodegradable material, similar to a variant or analog of polylactic acid PLA combined with ethylene glycol, which is understood according to the file description), a large amount of wastewater containing organic matter, acid-base substances and other pollutants will be generated.

[0003] The traditional wastewater treatment device and process often have problems such as low treatment efficiency and insufficient neutralization reaction when treating polylactic acid ethylene glycol ester production wastewater.

[0004] Specifically, some treatment devices only use simple stirring to promote the mixing of wastewater and neutralizing substances, but this method is difficult to achieve ideal mixing effect, especially when treating wastewater with high viscosity or containing a large amount of suspended solids.

[0005] Therefore, it is particularly important to develop an efficient and flexible multi-stage wastewater treatment device and process for wastewater treatment in the production process of polylactic acid ethylene glycol ester.

[0006] Therefore, the wastewater treatment device and process in the production process of polylactic acid ethylene glycol ester are proposed to solve the above problems. SUMMARY

[0007] The purpose of the present application is to provide a wastewater treatment device and process in the production process of polylactic acid ethylene glycol ester.

[0008] The wastewater treatment device in the production process of polylactic acid ethylene glycol ester comprises a treatment pipe connected with a water inlet pipe and a water outlet pipe and a dripping pipe at both ends, a rotating rod penetrating through the treatment pipe is rotatably connected in the treatment pipe, a first movable plate is slidably connected on the rotating rod, a plurality of stirring rods are connected at the edge of the first movable plate, a second movable plate is movably connected on the first movable plate through an adjusting piece, the adjusting piece slidably connected with the end of the rotating rod is used to adjust the distance between the first movable plate and the second movable plate, a stirring ring is movably inserted at the edge of the second movable plate through an elastic piece, and the stirring rod is movably arranged in the stirring ring, and a sliding rod connected with the adjusting piece is slidably connected in the middle of the second movable plate.

[0009] Preferably, a plurality of receiving grooves are formed in the stirring rod, and a bifurcated rod located in the stirring ring is rotatably connected in the receiving grooves, and the stirring rod and the bifurcated rod are made of repulsive magnetic materials; the local concentration gradient in the wastewater is broken, and the neutralizing agent is more uniformly distributed in the wastewater.

[0010] Preferably, two limiting plates are fixedly connected to the sliding rod, and the two limiting plates are located on the two sides of the second movable plate; the other end of the treatment pipe is fixedly connected with a fixed rod, and the fixed rod is movably sleeved with the sliding rod through an elastic structure; the elastic structure movably sleeving with the sliding rod enables the sliding rod to be stably and elastically supported during movement, and further improves the operation stability of the device.

[0011] Preferably, the rotating rod is of L-shaped structure, the adjusting member comprises a sleeve fixedly connected with the end of the rotating rod, a connecting rod fixedly connected with the first movable plate is movably sleeved in the sleeve, and a connecting rod is rotatably connected between the end of the connecting rod and the sliding rod through embedding a ball; this design improves the mixing efficiency and promotes the sufficient performance of the neutralization reaction.

[0012] Preferably, the elastic member comprises a movable rod movably penetrating through the second movable plate, the outer end of the movable rod is fixedly connected with the stirring ring, and a spring is hung between the inner end of the movable rod and the sliding column; the hanging mode of the spring provides stable elastic support, and ensures the stability and reliability of the stirring ring during movement.

[0013] Preferably, the motor is fixedly connected outside the treatment pipe, and the output shaft of the motor is fixedly connected with the rotating rod penetrating through the treatment pipe.

[0014] Preferably, the treatment pipe is two, and the two treatment pipes are fixedly connected in a staggered manner; a step is formed at the connection of the two treatment pipes, and a discharge pipe for collecting the precipitate is arranged at the step; the staggered connection of the treatment pipes forms the step, and the collection and discharge of the precipitate are facilitated.

[0015] Preferably, the first movable plate is fixedly connected with a sleeve movably matched with the rotating rod, the rotating rod is fixedly connected with a first push plate movably arranged in the sleeve, a sliding groove is formed in the sleeve, and a second push plate fixedly connected with the rotating rod is slidably matched in the sliding groove; the sleeve and the first push plate ensure the stability and reliability of the first movable plate during rotation of the rotating rod, the sliding groove and the second push plate are matched to realize accurate control of the movement tracks of the first movable plate and the second movable plate, and the efficiency and effect of the wastewater treatment are further improved.

[0016] Compared with the prior art, the advantages of the present application are that:

[0017] 1. By driving the first movable plate and the second movable plate to move away from or close to each other, while the stirring ring and the stirring rod make circular motion and diffusion-constriction motion in the wastewater treatment pipe, this multi-dimensional and multi-level stirring method greatly improves the mixing efficiency of wastewater and neutralizing agent, promotes the full progress of neutralization reaction, and effectively purifies the wastewater.

[0018] 2. The distance between the first movable plate and the second movable plate is adjustable, and then the stirring intensity and range can be flexibly adjusted according to the actual wastewater characteristics (such as viscosity, suspended matter content, etc.), so as to improve the wastewater treatment efficiency.

[0019] 3. The receiving groove and the rotatingly connected bifurcated rod on the stirring rod, and the repulsive magnetic material used by the bifurcated rod and the stirring rod, make the bifurcated rod make diffusion-constriction motion during stirring, further enhancing the wastewater treatment effect. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure;

[0021] Figure 2 is a schematic diagram of the cross-sectional structure of the treatment pipe;

[0022] Figure 3 is a schematic diagram of the cross-sectional structure of the treatment pipe;

[0023] Figure 4 is a schematic diagram of the split structure of the two treatment pipes;

[0024] Figure 5 is a schematic diagram of the split structure of the sleeve and the rotating rod;

[0025] Figure 6 is a schematic diagram of the split structure of the fixed rod and the sliding rod;

[0026] Figure 7 is a schematic diagram of the split structure of the stirring ring and the second movable plate;

[0027] Figure 8 is a schematic diagram of the cross-sectional structure of the first movable plate;

[0028] Figure 9 is a schematic diagram of the split structure of the sleeve and the connecting rod;

[0029] Figure 10 is a schematic diagram of the cross-sectional structure of the second movable plate.

[0030] Label explanation: 1, processing tube; 2, rotating rod; 3, first movable plate; 4, stirring rod; 5, second movable plate; 6, stirring ring; 7, sliding rod; 8, storage groove; 9, forked rod; 10, limiting plate; 11, fixed rod; 12, elastic structure; 13, sleeve; 14, connecting rod; 15, connecting rod; 16, movable rod; 17, spring; 18, motor; 19, step; 20, discharge pipe; 21, sleeve; 22, first push plate; 23, sliding groove; 24, second push plate; 25, reinforcing rib. DETAILED DESCRIPTION

[0031] The content of the application is described in detail below in combination with the drawings and examples of the specification:

[0032] As Figure 1 and Figure 10 The wastewater treatment device provided by the application in the production process of polylactic acid glycol ester and the process thereof are shown in the embodiment schematic diagram.

[0033] The wastewater treatment device in the production process of polylactic acid glycol ester comprises a processing tube 1 which is communicated with a water inlet pipe and a water outlet pipe (the water outlet pipe is away from the motor 18) and a dripping pipe (located in the middle part of the processing tube 1) at two ends, a rotating rod 2 which is rotatably connected in the processing tube 1 and penetrates out of the processing tube 1, a first movable plate 3 which is slidably connected on the rotating rod 2, a plurality of stirring rods 4 which are connected at the edge of the first movable plate 3, a second movable plate 5 which is movably connected on the first movable plate 3 through an adjusting piece, an adjusting piece which is slidably connected at the end of the rotating rod 2 and is used for adjusting the distance between the first movable plate 3 and the second movable plate 5, a stirring ring 6 which is movably inserted at the edge of the second movable plate 5 through an elastic piece, and a sliding rod 7 which is slidably connected in the middle part of the second movable plate 5 and connected with the adjusting piece.

[0034] Through the multi-level and multi-dimensional stirring design, the efficient mixing of wastewater and neutralizing substances is realized, and the wastewater treatment efficiency is improved. The design of the adjusting piece enables the device to flexibly adjust the stirring intensity and range according to the actual wastewater characteristics, thereby enhancing the versatility and treatment effect of the device.

[0035] The processing tube 1 is two and is fixedly connected in staggered communication, and the connecting part of the two processing tubes 1 forms a step 19, and the discharge pipe 20 (located at the bottom of the processing tube 1) for collecting the precipitate is arranged at the step 19.

[0036] Among them, the water inlet pipe (for making the wastewater enter the processing tube 1), the water outlet pipe (for separating the purified water in the processing tube 1), the dripping pipe (for dripping the neutralizing substances) and the discharge pipe 20 (for collecting the precipitate) are all provided with corresponding control valves, the outer end of the water outlet pipe is provided with a water pumping device, and the inner end of the water outlet pipe is provided with a filter screen, so as to facilitate the pumping away of the purified water.

[0037] A plurality of receiving grooves 8 are formed in the stirring rod 4, and a bifurcated rod 9 located in the stirring ring 6 is rotatably connected in the receiving grooves 8. The stirring rod 4 and the bifurcated rod 9 are made of repulsive magnetic materials, respectively. The design of the repulsive magnetic materials enables the bifurcated rod 9 to make diffusion-constriction movement in the stirring process, further enhances the mixing effect, and helps to break the local concentration gradient in the wastewater, so that the neutralizing agent is more evenly distributed in the wastewater.

[0038] Two limiting plates 10 are fixedly connected to the sliding rod 7, and the two limiting plates 10 are located on the two sides of the second movable plate 5. The other end of the treatment pipe 1 is fixedly connected with a fixed rod 11, and the fixed rod 11 is movably sleeved with the sliding rod 7 through an elastic structure 12. In this setting, the two ends of the elastic structure 12 are not connected with the inner cavity of the fixed rod 11 and the end of the sliding rod 7, but only abut against the inner cavity of the fixed rod 11 and the end of the sliding rod 7. The sliding rod 7 moves along the fixed rod 11, but always does not separate. The design of the limiting plate 10 limits the movement distance of the sliding rod 7 relative to the second movable plate 5, ensuring the stability and reliability of the device. The movable sleeving design of the elastic structure 12 and the sliding rod 7 enables the sliding rod 7 to maintain stable elastic support during movement, further improving the running stability of the device.

[0039] The rotating rod 2 is of L-shaped structure. The adjusting part includes a sleeve 13 fixedly connected with the end of the rotating rod 2, a connecting rod 14 fixedly connected with the first movable plate 3 movably sleeved in the sleeve 13, and a connecting rod 15 rotatably connected between the end of the connecting rod 14 and the end of the sliding rod 7 through the embedded balls fixedly connected at the two ends of the connecting rod 15, i.e. the two ends of the connecting rod 15 are fixedly connected with the embedded balls, and the two embedded balls are embedded in the end of the connecting rod 14 and the end of the sliding rod 7, respectively. The embedded balls do not separate from the end of the connecting rod 14 and the end of the sliding rod 7, but also do not affect the original position rotation of the embedded balls in the end of the connecting rod 14 and the end of the sliding rod 7. The design of the L-shaped rotating rod 2 and the adjusting part enables the first movable plate 3 and the second movable plate 5 to move away from or close to each other under the drive of the motor 18, thereby realizing multi-dimensional stirring of the wastewater and the neutralizing agent. This design improves the mixing efficiency and promotes the full progress of the neutralization reaction.

[0040] The elastic part includes a movable rod 16 movably passing through the second movable plate 5, the outer end of the movable rod 16 is fixedly connected with the stirring ring 6, and the spring 17 is hung between the inner end of the movable rod 16 and the sliding column. The design of the elastic part enables the stirring ring 6 to automatically adjust the position during the stirring process according to the viscosity and concentration of the wastewater, thereby maintaining the best stirring effect. The hanging mode of the spring 17 provides stable elastic support, ensuring the stability and reliability of the stirring ring 6 during movement.

[0041] The motor 18 is fixedly connected outside the treatment pipe 1, and the output shaft of the motor 18 is fixedly connected with the rotating rod 2 passing through the treatment pipe 1.

[0042] The first movable plate 3 is fixedly connected with a sleeve 21 which is movably connected with a rotating rod 2, the rotating rod 2 is fixedly connected with a first push plate 22 which is movably arranged in the sleeve 21, a sliding groove 23 is formed in the sleeve 13, the sliding groove 23 is slidably connected with a second push plate 24 which is fixedly connected with the rotating rod 2, the reinforcing ribs 25 are arranged on the outer wall of the sleeve 13 and located between the adjacent two sliding grooves 23, the staggered and connected treatment pipes 1 are designed to form the steps 19, so that the collection and discharge of the precipitates are facilitated, and the setting of the discharging pipe 20 simplifies the cleaning work of the precipitates, reduces the operation difficulty and labor intensity, and improves the overall efficiency of the wastewater treatment.

[0043] Working principle: firstly, the generated wastewater enters the treatment pipe 1 through the water inlet pipe, and the neutralizing agent (which is used for neutralization reaction with the wastewater in the treatment pipe 1 to achieve the purification effect, and is preferably in the form of liquid) is dropped into the dropping pipe;

[0044] Then, the motor 18 is started, the output shaft of the motor 18 drives the rotating rod 2 to rotate at the original position, and the rotation of the rotating rod 2 is limited by the second push plate 24 and the sliding groove 23, so as to ensure that the sleeve 21 and the first movable plate 3 rotate with the rotating rod 2, wherein the sleeve 21 and the first movable plate 3 are not affected by the rotation;

[0045] At the same time, the rotating rod 2 rotates, the L-shaped rotating rod 2 drives the sleeve 13 to make a circular motion, and the sleeve 13 cooperates with the rotation of the first movable plate 3, so that the connecting rod 14 stably makes a circular motion, wherein the position of the connecting rod 14 is different from the center of the second movable plate 5.

[0046] The connecting rod 14 making a circular motion drives the connecting rod 15 to move, due to the cooperation of the elastic structure 12 and the change of the distance between the position of the connecting rod 14 and the center of the second movable plate 5, the inclination angle of the connecting rod 15 changes, so that the first movable plate 3 and the second movable plate 5 move away from each other or move close to each other, thereby pushing the wastewater in the two treatment pipes 1, facilitating the sufficient contact between the wastewater and the neutralizing agent, and achieving the effect of purifying the wastewater;

[0047] During the movement of the first movable plate 3 and the second movable plate 5 away from or close to each other, the sliding rod 7 moves along the fixed rod 11, the sleeve 21 and the first movable plate 3 move along the rotating rod 2 (without affecting the rotation of the first movable plate 3 and the sleeve 21), the first push plate 22 slides in the sleeve 21, and the second push plate 24 slides in the sliding groove 23, so as to extrude the liquid in the sleeve 21 to move in the sliding groove 23, and further mix the liquid;

[0048] During the process, the stirring ring 6 and the stirring rod 4 make a circular motion at the same time, the stirring rod 4 rotates in the stirring ring 6, and the stirring rod 4 moves along the axis of the stirring ring 6, so that the plurality of bifurcated rods 9 making a circular motion simultaneously make a diffusion-constriction motion, further ensuring the neutralization reaction.

[0049] When the wastewater is initially treated, it is pumped to the next wastewater treatment device through the pumping device and the water outlet pipe;

[0050] It is worth noting that the distance that the sliding rod 7 moves relative to the second movable plate 5 is small (limited by the two limiting plates 10), which is less than the distance that the second movable plate 5 moves relative to the connecting pipe;

[0051] When the sliding rod 7 moves under the action of the connecting rod 15, the sliding rod 7 moves relative to the second movable plate 5, and at this time, the second movable plate 5 has not moved, so that the sliding rod 7 pulls the spring 17, and the movable rod 16 moves along the second movable plate 5, so that the distance between the stirring ring 6 and the second movable plate 5 changes, thereby changing the position of the stirring rod 4 and the bifurcated rod 9 in the stirring ring 6, further increasing the mixing effect;

[0052] Regarding the operation steps of the present application:

[0053] S1, wastewater introduction and neutralizing agent dropping:

[0054] The wastewater generated in the production process is introduced into the treatment pipe 1 through the water inlet pipe, and at the same time, an appropriate amount of neutralizing agent is dropped into the treatment pipe 1 through the dropping pipe;

[0055] S2, starting the motor 18 for multi-dimensional stirring:

[0056] The motor 18 drives the rotating rod 2 to rotate, thereby driving the first movable plate 3 and the second movable plate 5 to move away from or close to each other;

[0057] At the same time, the stirring ring 6 and the stirring rod 4 make circular motion in the treatment pipe 1, and the bifurcated rod 9 on the stirring rod 4 makes diffusion-contraction motion due to the action of the repulsive magnetic material;

[0058] S3, sediment collection and preliminary purified water extraction:

[0059] During the stirring process, the suspended solids and other impurities in the wastewater gradually form a sediment, which is deposited on the step 19 formed at the bottom of the treatment pipe 1;

[0060] These sediments are conveniently collected and treated through the discharge pipe 20, and are cleaned;

[0061] S4, the water purified through the preliminary purification is extracted to the next wastewater treatment device through the water outlet pipe and the pumping device for further treatment.

Claims

1. A device for treating waste water in a production process of polylactic glycolic acid, characterized in that: The utility model provides a multistage wastewater purification treatment pipe (1) including end part respectively intercommunication with inlet pipe and outlet pipe and drop adding pipe, water pollution prevention and cure environment's purification pipe, treatment pipe (1) is rotated and is connected with the rotating rod (2) that goes out treatment pipe (1) in, rotating rod (2) on sliding fit has first movable plate (3), first movable plate (3) edge place is connected with a plurality of stirring rod (4), first movable plate (3) is movably connected with second movable plate (5) through adjusting part, and adjusting part is used for adjusting the interval between first movable plate (3) and second movable plate (5) with rotating rod (2) end sliding connection, and second movable plate (5) edge place is movably inserted with stirring ring (6) through elastic part, and stirring rod (4) is located in stirring ring (6) and moves, and the sliding rod (7) of adjusting part connection is slidably fitted in second movable plate (5); The rotating rod (2) is L type structure, and the adjusting part includes a sleeve (13) fixedly connected with the end of the rotating rod (2), a connecting rod (14) movably sleeved in the sleeve (13) and fixedly connected with the first movable plate (3), and a connecting rod (15) rotatably connected between the end of the connecting rod (14) and the sliding rod (7) by embedding a ball; A plurality of receiving grooves (8) are formed in the stirring rod (4), and a bifurcated rod (9) located in the stirring ring (6) is rotatably connected in the receiving groove (8), and the stirring rod (4) and the bifurcated rod (9) are respectively made of repulsive magnetic materials; Two limiting plates (10) are fixedly connected to the sliding rod (7), and the two limiting plates (10) are located on both sides of the second movable plate (5), another end of the treatment pipe (1) is fixedly connected with a fixed rod (11), and the fixed rod (11) is movably sleeved with the sliding rod (7) through an elastic structure (12); A sleeve (21) movably matched with the rotating rod (2) is fixedly connected to the first movable plate (3), the rotating rod (2) is fixedly connected with a first push plate (22) movably located in the sleeve (21), a sliding groove (23) is formed in the sleeve (13), and a second push plate (24) fixedly connected with the rotating rod (2) is slidably fitted in the sliding groove (23).

2. The polylactic acid ethylene glycol ester production process wastewater treatment device according to claim 1, characterized by: The elastic part includes a movable rod (16) movably passing out of the second movable plate (5), the movable rod (16) is fixedly connected with the stirring ring (6) at the outer end, and a spring (17) is hung between the inner end of the movable rod (16) and the sliding column.

3. The polylactic acid ethylene glycol ester production process wastewater treatment device according to claim 2, characterized by: A motor (18) is fixedly connected to the outside of the treatment pipe (1), and an output shaft of the motor (18) is fixedly connected with the rotating rod (2) passing out of the treatment pipe (1).

4. The polylactic acid ethylene glycol ester production process wastewater treatment device according to claim 3, characterized by: The treatment pipe (1) is two, and is fixedly connected in staggered connection, a step (19) is formed at the connection of the two treatment pipes (1), and a discharging pipe (20) for collecting sediment is arranged at the step (19).

5. A wastewater treatment process in a production process of polylactic acid ethylene glycol ester, characterized by, The wastewater treatment device in the production process of polylactic acid glycol ester according to any one of claims 1-4, the specific method comprises the following steps: S1, wastewater is introduced and neutralizing agent is added: The wastewater generated in the production process is introduced into the treatment pipe (1) through the inlet pipe, and the neutralizing agent is added into the treatment pipe (1) through the drop adding pipe. S2, start the motor (18) for multi-dimensional stirring: The motor (18) drives the rotating rod (2) to rotate, and then drives the first movable plate (3) and the second movable plate (5) to move away from or close to each other; At the same time, the stirring ring (6) and the stirring rod (4) do circular motion in the treatment pipe (1), and the bifurcated rod (9) on the stirring rod (4) does diffusion-shrinkage motion due to the action of repulsive magnetic material; S3, sediment collection and preliminary purification water extraction: During the stirring process, the suspended solids and other impurities in the wastewater gradually form a sediment, which deposits on the step (19) formed at the bottom of the staggered communication of the treatment pipe (1); Through the discharge pipe (20), these sediments can be conveniently collected and treated, and cleaned; S4, the water purified by the preliminary purification is extracted to the next wastewater treatment device for further treatment through the water outlet pipe and the water extraction device.

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