A kind of equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose

Abstract

The present invention proposes an extraction device for glycolic acid in the production process of sodium carboxymethyl cellulose, which relates to the technical field of glycolic acid extraction, including an extraction box and a spherical box, wherein a spherical chamber adapted to the spherical box is provided in the extraction box, the spherical box is rotatably installed in the spherical chamber, and an opening No. 1 communicating with the spherical chamber is provided on the top of the extraction box. The present invention proposes an extraction device for glycolic acid in the production process of sodium carboxymethyl cellulose, which can perform filtering and distillation operations of glycolic acid in the production process of sodium carboxymethyl cellulose in the same device through the provision of an extraction box, a spherical box, a driving structure, a partition plate, a filter heating tube, a one-way valve structure, a filter screen, a No. 1 plugging structure, a No. 2 plugging structure, an external box, a feed pipe, a distillation discharge pipe and a switching plugging structure, thereby reducing the space occupied by the equipment, and at the same time reducing the contamination of the mixture caused by leakage, and reducing the impurity of the glycolic acid solution of the distillation product.

Description

Technical Field

[0001] The invention relates to the technical field of glycolic acid extraction, in particular to equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose. Background Art

[0002] Sodium carboxymethyl cellulose (CMC) is an important cellulose derivative, which is widely used as a thickener, stabilizer and auxiliary agent in the food, pharmaceutical, cosmetic and petroleum industries. In the production process of sodium carboxymethyl cellulose, glycolic acid, as one of the etherifying agents, usually reacts with cellulose under alkaline conditions to introduce carboxymethyl groups, thereby generating carboxymethyl cellulose. However, glycolic acid may not be completely converted into carboxymethyl groups during the reaction, and some glycolic acid may remain in the final product. At this time, it is necessary to extract glycolic acid from the product. The main purposes of extracting glycolic acid are: 1. Improve product purity: glycolic acid exists in the product as a reaction by-product, which may affect the performance and quality of sodium carboxymethyl cellulose. By extracting glycolic acid, the purity of the product can be improved to ensure that the product meets relevant standards and application requirements; 2. Reduce the impact on the environment: glycolic acid, as an organic solvent, may cause certain pollution and impact on the environment if it remains in the final product. Therefore, extracting glycolic acid helps to reduce the negative impact on the environment; 3. Avoid the impact on the health of users: If harmful substances such as glycolic acid remain in the product, it may cause certain risks to the health of the end user. By extracting glycolic acid, the safety and usability of the final product can be ensured; 4. Control product performance: The residual amount of glycolic acid may affect the properties of sodium carboxymethyl cellulose, such as viscosity, solubility, etc. Extracting glycolic acid helps to control the performance of the product so that it can meet specific application requirements.

[0003] The extraction of glycolic acid in the production process of sodium carboxymethyl cellulose usually requires pretreatment, which usually includes filtration or precipitation to remove impurities and solid particles to make the liquid to be distilled cleaner. This requires at least one filtration device and a distillation tower to be used in conjunction. The connection between the filtration device and the distillation tower may leak, causing external impurities to mix in, which may affect the efficiency of the distillation and the purity of the distilled product. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes an extraction device for glycolic acid in the production process of sodium carboxymethyl cellulose.

[0005] The present invention provides an extraction device for glycolic acid in the production process of sodium carboxymethyl cellulose, comprising an extraction box and a spherical box, wherein a spherical chamber adapted to the spherical box is provided in the extraction box, the spherical box is rotatably installed in the spherical chamber, a No. 1 opening connected to the spherical chamber is provided at the top of the extraction box, a No. 2 opening connected to the spherical chamber is provided at the bottom of the extraction box, and a driving structure for driving the spherical box to rotate in the spherical chamber is installed on the extraction box;

[0006] A working chamber is provided in the spherical box, a partition plate is fixedly installed in the working chamber of the spherical box, the partition plate can divide the working chamber into a filter chamber and a distillation chamber arranged in an upper and lower manner, a plurality of filter heating tubes are installed through the partition plate, one end of the filter heating tube is flush with one side surface of the partition plate, the other side of the filter heating tube protrudes from the other side surface of the partition plate, the filter heating tube can connect the filter chamber and the distillation chamber, a one-way valve structure is installed in the filter heating tube, when the end of the filter heating tube protruding from the side surface of the partition plate is arranged downward, the one-way valve is in an open state, and a filter screen is installed at a port of the filter heating tube that is flush with the side surface of the partition plate;

[0007] The spherical box is provided with a feed port connected to the filter cavity, and the feed port can be connected to the No. 1 opening and the No. 2 opening respectively. The spherical box is also provided with a No. 1 blocking structure capable of blocking the feed port;

[0008] The spherical box is also provided with a distillation port connected to the distillation chamber, and the distillation port can be connected to the first opening and the second opening respectively. The spherical box is also provided with a second plugging structure capable of plugging the distillation port;

[0009] An external box connected to opening No. 1 is installed on the top of the extraction box, a feed pipe and a distillation discharge pipe are installed on the external box, and a switching blocking structure is installed in the external box, which can block the feed pipe and the distillation discharge pipe.

[0010] Preferably, the one-way valve structure includes a portal frame, a movable rod, a conical blocking block and a blocking spring; the portal frame is fixedly installed on the end of the filter heating tube protruding from the side of the partition plate, one end of the movable rod slides through the transverse section of the portal frame and is fixedly connected to the conical blocking block, the conical blocking block can block the end opening of the filter heating tube, the blocking spring is mounted on the movable rod, and the two ends of the blocking spring are respectively abutted against the conical blocking block and the transverse section of the portal frame.

[0011] Preferably, the No. 1 blocking structure includes a No. 1 telescopic rod, a No. 1 blocking door and a No. 1 return spring; a No. 1 bracket is fixedly installed on the inner wall of the filter chamber, one end of the No. 1 telescopic rod passes through the No. 1 bracket and is fixedly connected to the No. 1 blocking door, the No. 1 blocking door can block the feed port, the No. 1 return spring is mounted on the No. 1 telescopic rod, and the two ends of the No. 1 return spring are respectively against the No. 1 bracket and the No. 1 blocking door.

[0012] Preferably, the No. 2 blocking structure includes a No. 2 telescopic rod, a No. 2 blocking door and a No. 2 return spring; a No. 2 bracket is fixedly installed in the distillation chamber, one end of the No. 2 telescopic rod passes through the No. 2 bracket and is fixedly connected to the No. 2 blocking door, the No. 2 blocking door can block the distillation port, the No. 2 return spring is mounted on the No. 2 telescopic rod, and the two ends of the No. 2 return spring are respectively against the No. 2 blocking door and the No. 2 bracket.

[0013] Preferably, the switching blocking structure includes an electric push rod, an adjusting block, a blocking ring block and a driving member; a moving cavity connected to the No. 1 opening is provided in the external connecting box, the electric push rod is fixedly mounted on the top of the external connecting box, the output shaft of the electric push rod passes through the top of the external connecting box and extends into the moving cavity, the adjusting block is fixedly mounted on the end of the output shaft of the electric push rod, the cross-sectional view of the adjusting block is T-shaped, the blocking ring block is slidably mounted in the moving cavity, a through hole is provided in the middle of the blocking ring block, the vertical section of the adjusting block passes through the through hole in the middle of the blocking ring block, and the diameter of the vertical section of the adjusting block is smaller than the inner diameter of the through hole in the middle of the blocking ring block, the driving member can drive the blocking ring block to abut against the transverse section of the adjusting block, and when the blocking ring block abuts against the transverse section of the adjusting block, the through hole in the middle of the blocking ring block is blocked by the adjusting block, and the cross-sectional area of ​​the transverse section of the adjusting block is smaller than the cross-sectional area of ​​the moving cavity;

[0014] The blocking ring block can block the communication port between the feed pipe and the movement chamber; the blocking ring block can also block the communication port between the distillation discharge pipe and the movement chamber.

[0015] Preferably, when the blocking ring block slides to the bottommost position of the moving chamber, the outer periphery of the blocking ring block blocks the communication port between the feed pipe and the moving chamber, and the distillation discharge pipe is in a communicating state with the moving chamber;

[0016] When the outer periphery of the sealing ring block seals the connecting port between the distillation discharge pipe and the moving chamber, the feed pipe and the moving chamber are in a connecting state.

[0017] Preferably, the driving member comprises a heat-conducting spring, and two ends of the heat-conducting spring respectively abut against the top inner wall of the moving cavity and the top surface of the sealing ring block.

[0018] Preferably, a cold air box is fixedly installed on the top inner wall of the movement cavity, the top end of the heat-conducting spring is fixedly connected to the cold air box, the top surface of the sealing ring block is a conical surface, and the bottom end of the sealing ring block rests on the conical surface of the sealing ring block.

[0019] Preferably, a plurality of opening rods are fixedly connected to the bottom end of the sealing ring block, and the bottom ends of the opening rods can be against the No. 1 sealing door or the No. 2 sealing door. Under the action force of the heat-conducting spring, the opening rods can be driven to push the No. 1 sealing door to move into the filtration chamber or drive the No. 2 sealing door to move into the distillation chamber.

[0020] Preferably, the driving structure includes a motor; the motor is fixedly mounted on the extraction box, and the output shaft of the motor passes through the extraction box and is fixedly connected to the spherical box.

[0021] The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose proposed by the present invention has the following beneficial effects: by arranging an extraction box, a spherical box, a driving structure, a partition plate, a filtering and heating tube, a one-way valve structure, a filter screen, a No. 1 plugging structure, a No. 2 plugging structure, an external box, a feed pipe, a distillation discharge pipe and a switching plugging structure, the glycolic acid in the production process of sodium carboxymethyl cellulose can be filtered and distilled in the same equipment, thereby reducing the space occupied by the equipment, and at the same time reducing the contamination of the mixture caused by leakage, and reducing the impurity of the glycolic acid solution of the distillation product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The present invention provides a schematic diagram of the overall structure of an extraction device for glycolic acid in the production process of sodium carboxymethyl cellulose.

[0023] Figure 2 The present invention provides a position state diagram of a No. 1 blocking door, a No. 2 blocking door, an adjusting block, a blocking ring block and an opening rod during a mixture filtration operation in a device for extracting ethanolic acid in a sodium carboxymethyl cellulose production process proposed by the present invention.

[0024] Figure 3 The present invention provides a position state diagram of a No. 1 blocking door, a No. 2 blocking door, an adjusting block, a blocking ring block and an opening rod in a normal state of an extraction device for glycolic acid in a sodium carboxymethyl cellulose production process proposed by the present invention.

[0025] Figure 4 The present invention provides a position status diagram of a No. 1 blocking door, a No. 2 blocking door, an adjusting block, a blocking ring block and an opening rod in an extraction device for glycolic acid in a sodium carboxymethyl cellulose production process during a distillation operation.

[0026] Figure 5The present invention provides a cross-sectional view of an extraction box and an external connection box in an extraction device for glycolic acid in a sodium carboxymethyl cellulose production process.

[0027] Figure 6 The present invention provides a cross-sectional view of a spherical box in an extraction device for glycolic acid in a sodium carboxymethyl cellulose production process.

[0028] Figure 7 The present invention provides a schematic diagram of the positions of a No. 1 blocking door and a switching blocking structure during filtering and feeding in an extraction device for glycolic acid in a sodium carboxymethyl cellulose production process proposed by the present invention.

[0029] Figure 8 The present invention provides a schematic diagram of the positions of a No. 1 blocking door and a switching blocking structure in a normal state in a glycolic acid extraction device in a sodium carboxymethyl cellulose production process proposed by the present invention.

[0030] Fig. 9 The present invention provides a schematic diagram of the positions of a No. 1 plugging door and a switching plugging structure during distillation operation in an extraction device for glycolic acid in a sodium carboxymethyl cellulose production process.

[0031] Fig.10 The present invention provides a schematic structural diagram of an adjusting block, a sealing ring block and an opening rod in an extraction device for glycolic acid in a sodium carboxymethyl cellulose production process.

[0032] Fig.11 The present invention proposes a device for extracting glycolic acid in the production process of sodium carboxymethyl cellulose Figure 2 Enlarged view of point A in the middle.

[0033] Fig.12 The present invention provides a cross-sectional view of a partial partition plate, a filtering and heating tube and a one-way valve structure in an extraction device for glycolic acid in a sodium carboxymethyl cellulose production process.

[0034] In the figure: 1. extraction box; 2. spherical box; 3. partition plate; 4. filter heating tube; 5. external box; 6. feed pipe; 7. distillation discharge pipe; 8. filter screen; 9. door frame; 10. movable rod; 11. conical blocking block; 12. blocking spring; 13. telescopic rod No. 1; 14. blocking door No. 1; 15. reset spring No. 1; 16. telescopic rod No. 2; 17. blocking door No. 2; 18. reset spring No. 2; 19. electric push rod; 20. adjustment block; 21. blocking ring block; 22. heat-conducting spring; 23. cold air box; 24. opening rod; 25. motor. DETAILED DESCRIPTION

[0035] Reference Figure 1-Figure 12The present invention provides an extraction device for glycolic acid in the production process of sodium carboxymethyl cellulose, comprising an extraction box 1 and a spherical box 2. A spherical chamber adapted to the spherical box 2 is provided in the extraction box 1, and the spherical box 2 is rotatably installed in the spherical chamber. The diameter of the spherical box 2 is the same as the inner diameter of the spherical chamber. An opening No. 1 connected to the spherical chamber is provided at the top of the extraction box 1 for feeding, and an opening No. 2 connected to the spherical chamber is provided at the bottom of the extraction box 1 for discharging. A driving structure for driving the spherical box 2 to rotate in the spherical chamber is installed on the extraction box 1, and the driving structure comprises a motor 25, which is fixedly installed on the extraction box 1, and the output shaft of the motor 25 passes through the extraction box 1 and is fixedly connected to the spherical box 2, and the spherical box 2 is driven by the motor 25 to rotate in the spherical chamber, and the output shaft of the motor 25 is arranged horizontally.

[0036] An external box 5 connected to opening No. 1 is installed on the top of the extraction box 1, and a feed pipe 6 and a distillation discharge pipe 7 are installed on the external box 5. A switching sealing structure is installed in the external box 5, and the switching sealing structure can block the feed pipe 6 and the distillation discharge pipe 7.

[0037] like Figure 2 , Figure 3 and Figure 6As shown in, a working chamber is provided in the spherical box 2, and a partition plate 3 is fixedly installed in the working chamber of the spherical box 2. The partition plate 3 can divide the working chamber into a filtering chamber and a distillation chamber arranged in an upper and lower manner. A plurality of vertically arranged filtering and heating tubes 4 are installed through the partition plate 3, and the filtering and heating tubes 4 are wrapped with a heating plate on the outer circumference. One end of the filtering and heating tube 4 is flush with one side surface of the partition plate 3, and the other side of the filtering and heating tube 4 protrudes from the other side surface of the partition plate 3. At the same time, a heating tube connected to the heating plate is installed on the side of the partition plate 3, and the filtering and heating tube 4 can connect the filtering chamber and the distillation chamber. A one-way valve structure is installed in the filtering and heating tube 4. When one end of the filtering and heating tube 4 protruding from the side surface of the partition plate 3 is arranged downward, the one-way valve is in an open state, and a filter screen 8 is installed at a port of the filtering and heating tube 4 flush with the side surface of the partition plate 3. A feed port connected to the filter chamber is provided on the spherical box 2, and the feed port can be connected to the No. 1 opening and the No. 2 opening respectively. The spherical box 2 is connected to the feed port, and a No. 1 blocking structure capable of blocking the feed port is also installed on the spherical box 2. In the process of producing sodium carboxymethyl cellulose, it is necessary to extract the ethanolic acid therein, and the mixture needs to be filtered before distillation extraction. The mixture enters the filter cavity of the spherical box 2 through the feed pipe 6, the No. 1 opening and the feed port (the distillation discharge pipe 7 is in a blocked state), and the mixture is filtered through the filter screen 8. At this time, the one-way valve structure is opened, and the liquid flows into the distillation cavity below through the filter heating tube 4. During the filtering process, the motor 25 can also drive the spherical box 2 to shake back and forth, so that the mixture falling on the filter screen 8 constantly changes its position, reducing the possibility of the filter screen 8 being blocked, ensuring the filtering effect, and completing the filtering treatment of impurities or solid particles in the mixture. After the filtering is completed, the motor 25 works to drive the spherical box 2 to rotate, so that the filter cavity and the distillation cavity therein are inverted, such as Figure 4 In the state shown in , the distillation chamber is on the top and the filter chamber is on the bottom. At this time, the one-way valve structure is in a blocked state, so that the filter chamber and the distillation chamber are in a completely disconnected state. When the filter chamber is at the bottom, the impurities and solid particles in the filter chamber fall downward due to the influence of gravity. At the same time, the feed port on the filter chamber is connected with the No. 2 opening at the lower end of the extraction box 1, and the No. 1 blocking structure is opened to clean out the impurities and solid particles filtered out of the filter chamber.

[0038] A distillation port connected to the distillation chamber is also provided on the spherical box 2, and the distillation port can be connected to the No. 1 opening and the No. 2 opening respectively. A No. 2 blocking structure capable of blocking the distillation port is also installed on the spherical box 2. After cleaning the filtered impurities and solid particles, the No. 2 blocking structure is opened, and the distillation discharge pipe 7 is opened at the same time, and the feed pipe 6 is blocked (to prevent steam from being discharged through the feed pipe 6). The filtering heating tube 4 and the heating tube on the top surface of the partition plate 3 are energized and heated. The filtered mixture is heated by the heating of the filtering heating tube 4. Since the filtering heating tube 4 is arranged vertically and inserted in various places in the mixture, the uniformity of heating the mixture can be ensured. At the same time, the motor 25 drives the spherical box 2 to rock back and forth, so that the mixture in the distillation chamber also rocks back and forth, so that the mixture therein is fully in contact with the filtering heating tube 4, thereby ensuring the heating and distillation treatment of the mixture. The steam generated by the distillation enters the condenser through the distillation discharge pipe 7 for condensation treatment. It has a simple structure, convenient operation, small space occupation and low equipment cost.

[0039] like Figure 2 , Figure 3 , Figure 4 , Figure 6 , Fig.11 and Fig.12 As shown in, the one-way valve structure includes a gantry 9, a movable rod 10, a conical blocking block 11 and a blocking spring 12; the gantry 9 is fixedly mounted on the end of the filter heating tube 4 protruding from the side of the partition plate 3, one end of the movable rod 10 slides through the transverse section of the gantry 9 and is fixedly connected to the conical blocking block 11, the conical blocking block 11 can block the end opening of the filter heating tube 4, the blocking spring 12 is sleeved on the movable rod 10, and the two ends of the blocking spring 12 are respectively against the conical blocking block 11 and the transverse section of the gantry 9. It should be noted that the movable rod 10 cannot be detached from the gantry 9. When the end of the filter heating tube 4 close to the conical blocking block 11 is facing downward, the conical blocking block 11 is affected by gravity and squeezes the sealing spring 12, causing the conical sealing block 11 to move downward and open the bottom opening of the filter heating tube 4, which can facilitate the filtered mixed liquid to flow down. When the spherical box 2 rotates, the conical sealing block 11 and the movable rod 10 are tilted, and the pressure of the conical sealing block 11 on the sealing spring 12 gradually decreases. The rebound force of the sealing spring 12 drives the conical sealing block 11 to approach the end of the filter heating tube 4 until the end opening of the filter heating tube 4 is blocked. No driving device is involved, which can reduce the influence of high temperature or chemical components in the mixed liquid on the driving device, and can also reduce the wiring design to ensure the normal use of the one-way valve structure.

[0040] like Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7As shown in the figure, the No. 1 blocking structure includes a No. 1 telescopic rod 13, a No. 1 blocking door 14 and a No. 1 return spring 15; a No. 1 bracket is fixedly installed on the inner wall of the filter chamber, one end of the No. 1 telescopic rod 13 passes through the No. 1 bracket and is fixedly connected to the No. 1 blocking door 14, and the No. 1 blocking door 14 can block the feed inlet, and the No. 1 return spring 15 is mounted on the No. 1 telescopic rod 13, and the two ends of the No. 1 return spring 15 are respectively against the No. 1 bracket and the No. 1 blocking door 14. It should be noted that the No. 1 blocking door 14 can pass through the No. 2 opening, and when the filtered impurities and solid particles are cleaned, the No. 1 return spring 1 The first blocking door 14 is driven to pass through the feed inlet and the second opening to directly expose to the outside of the extraction box 1, so that the impurities and solid particles in the filter cavity can fall out directly. At the same time, the motor 25 can work to shake the spherical box 2 to clean out the impurities and solid particles inside. When the first blocking door 14 blocks the feed inlet, the first return spring 15 drives the first blocking door 14 to abut against the inner wall of the spherical chamber, so that the first blocking door 14 is located in the feed inlet and blocks the feed inlet. The sliding cooperation of the first telescopic rod 13 on the first bracket limits the movement position of the first blocking door 14.

[0041] like Figure 2 , Figure 3 , Figure 4 , Figure 6 and Fig. 9 As shown in, the No. 2 blocking structure includes a No. 2 telescopic rod 16, a No. 2 blocking door 17 and a No. 2 return spring 18; a No. 2 bracket is fixedly installed in the distillation chamber, one end of the No. 2 telescopic rod 16 passes through the No. 2 bracket and is fixedly connected to the No. 2 blocking door 17, the No. 2 blocking door 17 can block the distillation port, and the No. 2 return spring 18 is mounted on the No. 2 telescopic rod 16, and the two ends of the No. 2 return spring 18 are respectively against the No. 2 blocking door 17 and the No. 2 bracket. It should be noted that the cross-sectional area of ​​the No. 2 blocking door 17 is larger than the opening area of ​​the No. 2 opening, that is, the No. 2 blocking door 17 cannot pass through the No. 2 opening. The working principle of the No. 2 blocking structure is the same as that of the No. 1 blocking structure. When the mixed liquid in the distillation chamber needs to be taken out, the distillation chamber can be rotated to the lower position, and then the No. 2 blocking door 17 can be lifted up with a tool to retract into the distillation chamber, and the distillation port is opened, and the mixture in the distillation chamber flows out.

[0042] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 , Figure 8 , Fig. 9 and Fig.10As shown in the figure, the switching blocking structure includes an electric push rod 19, an adjustment block 20, a blocking ring block 21 and a driving member; the bottom end of the blocking ring block 21 is fixedly connected to a plurality of opening rods 24, the bottom end of the opening rod 24 can be against the No. 1 blocking door 14 or the No. 2 blocking door 17, under the action of the heat-conducting spring 22, the opening rod 24 can be driven to push the No. 1 blocking door 14 to move into the filtration chamber or drive the No. 2 blocking door 17 to move into the distillation chamber, and a movement connected to the No. 1 opening is opened in the external box 5. The electric push rod 19 is fixedly mounted on the top of the external box 5, the output shaft of the electric push rod 19 passes through the top of the external box 5 and extends into the movement cavity, the adjustment block 20 is fixedly mounted on the end of the output shaft of the electric push rod 19, the cross-sectional view of the adjustment block 20 is T-shaped, the transverse section of the adjustment block 20 is disc-shaped, and the top surface is a conical surface, the blocking ring block 21 is slidably mounted in the movement cavity, the middle part of the blocking ring block 21 is provided with a through hole, the vertical section of the adjustment block 20 passes through the through hole in the middle of the blocking ring block 21, and ... The diameter of the vertical section of the node block 20 is smaller than the inner diameter of the middle perforation of the sealing ring block 21. The driving member can drive the sealing ring block 21 to abut against the transverse section of the adjusting block 20. When the sealing ring block 21 abuts against the transverse section of the adjusting block 20, the middle perforation of the sealing ring block 21 is blocked by the adjusting block 20. The cross-sectional area of ​​the transverse section of the adjusting block 20 is smaller than the cross-sectional area of ​​the moving cavity. The sealing ring block 21 can block the connecting port between the feed pipe 6 and the moving cavity; the sealing ring block 21 can also block the connecting port between the distillation discharge pipe 7 and the moving cavity. The connecting port of the moving chamber, when the blocking ring block 21 slides to the bottom position of the moving chamber, the outer periphery of the blocking ring block 21 blocks the connecting port between the feed pipe 6 and the moving chamber, and the distillation discharge pipe 7 is in a connecting state with the moving chamber, when the outer periphery of the blocking ring block 21 blocks the connecting port between the distillation discharge pipe 7 and the moving chamber, the feed pipe 6 is in a connecting state with the moving chamber, and the driving member includes a heat-conducting spring 22, and the two ends of the heat-conducting spring 22 are respectively against the top inner wall of the moving chamber and the top surface of the blocking ring block 21. It should be noted that the blocking ring block 21 and the adjusting block 20 need to cooperate to block the moving chamber, and the blocking ring block 21 or the adjusting block 20 alone cannot block the moving chamber.

[0043] In normal state, Figure 3 and Figure 8 As shown in the figure, the output shaft of the electric push rod 19 retracts, driving the adjusting block 20, and the adjusting block 20 drives the blocking ring block 21 and the opening rod 24 to rise synchronously. The No. 1 blocking door 14 is located in the feed port and is rebounded by the No. 1 return spring 15 and rests against the inner wall of the spherical chamber, so that the No. 1 blocking door 14 blocks the feed port.

[0044] When adding the mixture, the status is as follows Figure 2 and Figure 7As shown in the figure, the electric push rod 19 drives the adjusting block 20 to descend in the motion chamber. Under the rebound action of the heat-conducting spring 22, the blocking ring block 21 descends and abuts against the lateral section of the adjusting block 20. It is restricted by the blocking ring block 21 and cannot continue to descend. The opening rod 24 below the blocking ring block 21 follows the descent of the blocking ring block 21 and descends synchronously. The descending opening rod 24 abuts against the top surface of the No. 1 blocking door 14. Since the rebound force of the heat-conducting spring 22 is greater than the rebound force of the No. 1 return spring 15, the opening rod 24 pushes the No. 1 blocking door 14 to move downward and open the feed port. The mixture reaches the motion chamber through the feed pipe 6 and then falls on the No. 1 blocking door 14 and is splashed, so that the impurities and solid particles in the mixture are dispersed and fall into the filter chamber. At the same time, due to the operation of the motor 25, the spherical box 2 is driven to shake back and forth, and the No. 1 blocking door 14 shakes synchronously with the spherical box 2, and will not touch the opening rod 24 during the shaking process. The position where the mixture flows and falls along the edge of the No. 1 blocking door 14 is changing, reducing the mixture from being concentrated in a bundle to a certain position in the filter chamber, thereby reducing the accumulation of impurities and solid particles and improving the filtering effect. In addition, a plurality of arc-shaped shallow grooves can be opened on the outer wall of the No. 1 blocking door 14. When the No. 1 blocking door 14 is shaken, the opening rod 24 always rests against the outer wall of the No. 1 blocking door 14. When the opening rod 24 reaches the shallow groove position, under the rebound force of the No. 1 return spring 15, the No. 1 blocking door 14 will be driven to rise slightly, so that the No. 1 blocking door 14 changes its upper and lower positions while shaking, making the position of the mixture more uncertain when falling around the No. 1 blocking door 14 (normal falling, being thrown out by vibration, etc.). At this time, the blocking ring block 21 is located on the side of the connecting port between the distillation discharge pipe 7 and the external connecting box 5, and the connecting port between the distillation discharge pipe 7 and the external connecting box 5 is blocked by the blocking ring block 21;

[0045] During the distillation operation, the status is as follows Figure 4 and Fig. 9As shown in the figure, the electric push rod 19 drives the regulating block 20 to descend. Similarly, under the rebound effect of the heat-conducting spring 22, the blocking ring block 21 descends to the lowest position in the movement chamber. The blocking ring block 21 blocks the connecting port between the feed pipe 6 and the movement chamber. Similarly, the opening rod 24 moves downward, and the opening rod 24 pushes the second blocking door 17 to retract into the distillation chamber and open the distillation port. At the same time, the filtering and heating tube 4 and the heating tube are energized and heated. The multiple protruding filtering and heating tubes 4 can fully heat various places in the mixed liquid, and the filtered mixed liquid is heated to be treated. The ethanolic acid is heated to the boiling point and evaporates, and at the same time, the motor 25 drives the spherical box 2 to rock back and forth, causing the mixed liquid in the distillation chamber to rock. The mixed liquid is fully rocked and moves, and can be fully heated, so that the ethanolic acid can be evaporated better. The generated steam reaches the upper movement chamber through the gap between the sealing ring block 21 and the adjusting block 20, and then reaches the condenser through the distillation discharge pipe 7 for condensation treatment. In addition, the height of the adjusting block 20 can be adjusted to control the size of the gap between the adjusting block 20 and the sealing ring block 21 to control the steam discharge speed.

[0046] A cold air box 23 is fixedly installed on the top inner wall of the moving cavity, and the top end of the heat-conducting spring 22 is fixedly connected to the cold air box 23. The top surface of the sealing ring block 21 is a conical surface, and the bottom end of the sealing ring block 21 rests on the conical surface of the sealing ring block 21. It should be noted that the external box 5 is also equipped with an air inlet pipe and an air outlet pipe connected to the cold air box 23. The cold air circulation can be injected into the cold air box 23, and then the low temperature is transferred to the heat-conducting spring 22. The heat-conducting spring 22 cools the vapor state of ethanol acid, which can reduce the temperature of the steam and reduce the damage of the condenser caused by the large temperature difference caused by the high-temperature ethanol acid directly entering the condenser. In addition, a small amount of ethanol acid will condense directly on the heat-conducting spring 22, and can flow directly along the heat-conducting spring 22 to the conical surface of the sealing ring block 21. The ethanol acid solution flows downward along the conical surface and is discharged through the distillation discharge pipe 7.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An extraction device for glycolic acid in the production process of sodium carboxymethylcellulose, characterized in that: The invention comprises an extraction box (1) and a spherical box (2), wherein a spherical chamber adapted to the spherical box (2) is provided in the extraction box (1), the spherical box (2) is rotatably mounted in the spherical chamber, a first opening connected to the spherical chamber is provided at the top of the extraction box (1), a second opening connected to the spherical chamber is provided at the bottom of the extraction box (1), and a driving structure for driving the spherical box (2) to rotate in the spherical chamber is installed on the extraction box (1); A working chamber is provided in the spherical box (2), a partition plate (3) is fixedly installed in the working chamber of the spherical box (2), the partition plate (3) is capable of dividing the working chamber into a filtering chamber and a distillation chamber arranged in an upper and lower manner, a plurality of filtering and heating tubes (4) are installed through the partition plate (3), one end of the filtering and heating tube (4) is flush with a side surface of the partition plate (3), the other side of the filtering and heating tube (4) protrudes from the other side surface of the partition plate (3), the filtering and heating tube (4) is capable of connecting the filtering chamber and the distillation chamber, a one-way valve structure is installed in the filtering and heating tube (4), when the end of the filtering and heating tube (4) protruding from the side surface of the partition plate (3) is arranged downward, the one-way valve is in an open state, and a filter screen (8) is installed at a port of the filtering and heating tube (4) that is flush with the side surface of the partition plate (3); The spherical box (2) is provided with a feed inlet connected to the filter cavity, and the feed inlet can be connected to the No. 1 opening and the No. 2 opening respectively. The spherical box (2) is also provided with a No. 1 blocking structure capable of blocking the feed inlet; The spherical box (2) is also provided with a distillation port connected to the distillation chamber, and the distillation port can be connected to the first opening and the second opening respectively. The spherical box (2) is also provided with a second blocking structure capable of blocking the distillation port. An external connection box (5) connected to the first opening is installed on the top of the extraction box (1); a feed pipe (6) and a distillation discharge pipe (7) are installed on the external connection box (5); a switchable blocking structure is installed in the external connection box (5); the switchable blocking structure can block the feed pipe (6); and the switchable blocking structure can block the distillation discharge pipe (7); The switching blocking structure comprises an electric push rod (19), an adjustment block (20), a blocking ring block (21) and a driving member; a movement chamber connected to the No. 1 opening is provided in the external connection box (5); the electric push rod (19) is fixedly mounted on the top of the external connection box (5); the output shaft of the electric push rod (19) passes through the top of the external connection box (5) and extends into the movement chamber; the adjustment block (20) is fixedly mounted on the end of the output shaft of the electric push rod (19); the cross-section of the adjustment block (20) is T-shaped; the blocking ring block (21) is slidably mounted in the movement chamber; A through hole is formed in the middle of the blocking ring block (21), and the vertical section of the adjusting block (20) passes through the through hole in the middle of the blocking ring block (21), and the diameter of the vertical section of the adjusting block (20) is smaller than the inner diameter of the through hole in the middle of the blocking ring block (21), and the driving member is capable of driving the blocking ring block (21) to abut against the transverse section of the adjusting block (20), and when the blocking ring block (21) abuts against the transverse section of the adjusting block (20), the through hole in the middle of the blocking ring block (21) is blocked by the adjusting block (20), and the cross-sectional area of ​​the transverse section of the adjusting block (20) is smaller than the cross-sectional area of ​​the movement cavity; The blocking ring block (21) can block the communication port between the feed pipe (6) and the movement chamber; the blocking ring block (21) can also block the communication port between the distillation discharge pipe (7) and the movement chamber.

2. The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: The one-way valve structure comprises a door-shaped frame (9), a movable rod (10), a conical blocking block (11) and a blocking spring (12); the door-shaped frame (9) is fixedly mounted on one end of the filter heating tube (4) protruding from the side of the partition plate (3); one end of the movable rod (10) slides through the transverse section of the door-shaped frame (9) and is fixedly connected to the conical blocking block (11); the conical blocking block (11) is capable of blocking the end opening of the filter heating tube (4); the blocking spring (12) is sleeved on the movable rod (10), and the two ends of the blocking spring (12) respectively abut against the conical blocking block (11) and the transverse section of the door-shaped frame (9).

3. The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: The No. 1 blocking structure comprises a No. 1 telescopic rod (13), a No. 1 blocking door (14) and a No. 1 return spring (15); a No. 1 bracket is fixedly installed on the inner wall of the filter chamber, one end of the No. 1 telescopic rod (13) passes through the No. 1 bracket and is fixedly connected to the No. 1 blocking door (14), and the No. 1 blocking door (14) can block the feed inlet, and the No. 1 return spring (15) is sleeved on the No. 1 telescopic rod (13), and the two ends of the No. 1 return spring (15) are respectively against the No. 1 bracket and the No. 1 blocking door (14).

4. The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: The No. 2 blocking structure comprises a No. 2 telescopic rod (16), a No. 2 blocking door (17) and a No. 2 return spring (18); a No. 2 bracket is fixedly installed in the distillation chamber, one end of the No. 2 telescopic rod (16) passes through the No. 2 bracket and is fixedly connected to the No. 2 blocking door (17), the No. 2 blocking door (17) can block the distillation port, the No. 2 return spring (18) is sleeved on the No. 2 telescopic rod (16), and the two ends of the No. 2 return spring (18) are respectively against the No. 2 blocking door (17) and the No. 2 bracket.

5. The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: When the blocking ring block (21) slides to the bottommost position of the movement chamber, the outer circumference of the blocking ring block (21) blocks the communication port between the feed pipe (6) and the movement chamber, and the distillation discharge pipe (7) is in a communication state with the movement chamber; When the outer periphery of the sealing ring block (21) seals the communication port between the distillation discharge pipe (7) and the movement chamber, the feed pipe (6) and the movement chamber are in a communication state.

6. The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose according to claim 5, characterized in that: The driving member comprises a heat-conducting spring (22), and two ends of the heat-conducting spring (22) respectively abut against the top inner wall of the moving cavity and the top surface of the sealing ring block (21).

7. The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose according to claim 6, characterized in that: A cold air box (23) is fixedly mounted on the top inner wall of the movement cavity, the top end of the heat-conducting spring (22) is fixedly connected to the cold air box (23), the top surface of the blocking ring block (21) is a conical surface, and the bottom end of the blocking ring block (21) abuts against the conical surface of the blocking ring block (21).

8. The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose according to claim 7, characterized in that: A plurality of opening rods (24) are fixedly connected to the bottom end of the blocking ring block (21); the bottom ends of the opening rods (24) can be abutted against the No. 1 blocking door (14) or the No. 2 blocking door (17); and under the action of the heat-conducting spring (22), the opening rods (24) can be driven to push the No. 1 blocking door (14) to move into the filtration chamber or to drive the No. 2 blocking door (17) to move into the distillation chamber.

9. The equipment for extracting glycolic acid in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: The driving structure comprises a motor (25); the motor (25) is fixedly mounted on the extraction box (1), and an output shaft of the motor (25) passes through the extraction box (1) and is fixedly connected to the spherical box (2).

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