A toluene recovery device and method for epoxy resin production

Abstract

This invention provides a toluene recovery device and method for epoxy resin production, relating to the field of toluene recovery. The invention includes a connecting pipe and a conveying assembly, positioned to the left and right of a distillation container. The connecting pipe is isolated from the distillation container, while the conveying assembly is connected to it. A hammering assembly is housed within the conveying assembly. The hammering assembly includes a piston and a heavy ball for sealing and sliding with the conveying assembly. The heavy ball is placed inside the distillation container and connected to the piston via a traction rope. A discharge hole is provided at the conveying assembly to discharge the gas pressure accumulated as the heavy ball moves upward. That is, based on the repeated cycle of gas pressure accumulation and release within the distillation container, the heavy ball is manipulated to hammer the toluene waste liquid, fully utilizing the excess heat on the side wall of the steam container. Furthermore, during hammering, the toluene waste liquid is thoroughly stirred, thereby releasing more effective toluene components.

Description

Technical Field

[0001] This invention relates to the field of toluene recovery, and more particularly to a toluene recovery apparatus and method used in epoxy resin production. Background Technology

[0002] Toluene is mainly produced from crude oil through petrochemical processes. As a solvent, it is used in oils, resins, natural and synthetic rubber, coal tar, asphalt, and cellulose acetate. It is also used as a solvent in cellulose paints and varnishes, as well as in photographic plates and inks. In epoxy resin production, it also participates in chemical reactions as a solvent. However, based on the properties of toluene, it is hazardous. Therefore, concentrated toluene waste liquid needs to be recycled and treated during production.

[0003] Toluene recovery methods include adsorption and distillation. Among them, heating distillation involves indirectly heating the toluene waste liquid to its boiling point, converting it from a liquid to a gas. The gas is then cooled by a cooling system and converted back to a liquid, thus achieving solid-liquid separation and toluene recovery. However, based on actual distillation results, during the distillation process, the amount of waste liquid gradually decreases. At this time, the container used to hold the waste liquid is still in a state of high-density heating. The side wall of the container that does not touch the waste liquid is at a higher temperature than the side wall of the container that does touch the waste liquid. In other words, a large amount of heat is not properly utilized during heating.

[0004] Therefore, in view of the aforementioned limitations, there is a need for a recovery device that can efficiently utilize heat and improve distillation efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a toluene recovery device and method for epoxy resin production, so as to solve the above-mentioned technical problems.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An epoxy resin production toluene recovery device includes a connecting pipe and a conveying assembly. The connecting pipe and the conveying assembly are distributed to the left and right of a distillation container. The connecting pipe is isolated from the distillation container, while the conveying assembly is connected in communication with the distillation container. A hammering assembly is installed inside the conveying assembly. The hammering assembly includes a piston and a heavy ball for sealing and sliding with the conveying assembly. The heavy ball is placed inside the distillation container and is connected to the piston via a traction rope. A discharge hole is provided at the conveying assembly to discharge the gas pressure accumulated as the heavy ball moves upward.

[0008] Preferably, the weight of the ball is greater than the weight of the piston.

[0009] Preferably, the delivery assembly includes an obliquely arranged sleeve installed at the distillation container. A stopper is fitted to the end of the sleeve away from the distillation container, and a spring is fixed to the end of the stopper facing the lumen. The spring is used to abut against the piston.

[0010] The conveying assembly also includes a pulley block, which is arranged at the bend inside the sleeve and is movably connected to the traction rope. The pulley block is used to support the traction rope.

[0011] Preferably, the conveying assembly further includes a limiting strip, which is fixedly connected to the sleeve along the piston sliding direction. The limiting strip is slidably adapted to the piston and is used to restrict the piston from overturning.

[0012] Preferably, a connecting pipe for transmitting steam is provided between the cooling component and the conveying component. The two ends of the connecting pipe are connected to the cooling component and the conveying component respectively, and one end of the connecting pipe is arranged at a lower position than the conveying component, while the other end of the connecting pipe is arranged at a higher position than the cooling component.

[0013] Preferably, the cooling assembly includes a cooling pipe, inside which a condenser pipe is fitted. One end of the condenser pipe is connected to a connecting pipe, and the other end of the condenser pipe passes through the cooling pipe and extends outward.

[0014] Preferably, the cooling assembly further includes a coolant inlet pipe and a coolant outlet pipe, which are distributed vertically and are connected to the cooling pipe.

[0015] Preferably, the distillation container includes a heating jacket, with the container body fitted inside the heating jacket. A cavity for retaining steam is formed between the container body and the heating jacket. A manifold is provided above the container body for discharging steam.

[0016] Preferably, the distillation vessel further includes a steam inlet pipe and a steam outlet pipe, which are distributed vertically and extend into the cavity through the heating jacket.

[0017] A method for recovering toluene from epoxy resin production equipment, characterized by comprising the following recovery steps:

[0018] 1) Inject the toluene waste liquid into the container body, and then guide the steam for heating into the cavity between the container body and the heating jacket to heat the toluene waste liquid;

[0019] 2) During heating, the toluene waste liquid diffuses outward in the form of vapor. During diffusion, the driving force provided by the gas pressure causes the heavy ball dragged by the piston to rise relative to the container body. When the piston approaches the outlet hole at the sleeve and moves away from the outlet hole, the high-pressure vapor inside the container body is released.

[0020] 3) After the high-pressure steam is released, based on the setting that the weight ball is larger than the piston, the piston is dragged back to reset, and the weight ball hammers the toluene waste liquid in the container body, causing the toluene waste liquid to slosh and splash onto the side wall of the container body, so as to efficiently utilize the heat at the side wall of the container body.

[0021] 4) High-pressure steam inside the container is introduced into the condenser tube through the connecting pipe. The condenser tube comes into contact with the coolant through the built-in cooling pipe to cool and liquefy the high-pressure steam, and the liquefied product is toluene solution.

[0022] The beneficial effects of this invention are:

[0023] In this invention, the hammering component and the conveying component are a set of mutually cooperating combined mechanisms. This combined mechanism relies on the changes in gas pressure inside the distillation container to control the relative position of the hammering component. That is, based on the repeated cycle of accumulating and releasing gas pressure in the distillation container, the heavy ball is manipulated to hammer the toluene waste liquid to make full use of the excess heat at the side wall of the distillation container. In addition, during the hammering, the toluene waste liquid is fully stirred, thereby releasing more effective toluene components. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a toluene recovery device for epoxy resin production according to the present invention.

[0025] Figure 2 This is a schematic diagram of the distillation vessel in this invention;

[0026] Figure 3 This is a schematic diagram of the combined structure of the conveying component, the hammering component, and the cooling component in this invention;

[0027] Figure 4 This is a schematic diagram of the hammering assembly in this invention;

[0028] Reference numerals: 1. Cooling assembly; 2. Connecting pipe; 3. Hammering assembly; 4. Conveying assembly; 5. Distillation vessel; 11. Coolant inlet pipe; 12. Condenser pipe; 13. Cooling pipe; 14. Coolant outlet pipe; 31. Piston; 32. Traction rope; 33. Weight ball; 41. Plug; 42. Spring; 43. Limiting strip; 44. Sleeve; 45. Pulley block; 51. Steam inlet pipe; 52. Manifold; 53. Heating jacket; 54. Vessel body; 55. Steam outlet pipe. Detailed Implementation

[0029] To make the technical means, creative features, achieved objectives, and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this invention and not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention.

[0030] Specific embodiments of the present invention are described below with reference to the accompanying drawings.

[0031] Example 1

[0032] refer to Figure 1-4 As shown, this embodiment provides a toluene recovery device for epoxy resin production, including a connecting pipe 2 and a conveying assembly 4. The connecting pipe 2 and the conveying assembly 4 are distributed to the left and right of a distillation container 5. The connecting pipe 2 is isolated from the distillation container 5, and the conveying assembly 4 is connected to the distillation container 5. A hammering assembly 3 is installed inside the conveying assembly 4. The hammering assembly 3 includes a piston 31 and a heavy ball 33 for sealing and sliding with the conveying assembly 4. The heavy ball 33 is placed inside the distillation container 5 and is connected to the piston 31 through a traction rope 32. A discharge hole is provided at the conveying assembly 4 to discharge the gas pressure accumulated when the heavy ball 33 moves upward.

[0033] Of these, the weight of the heavy ball 33 is greater than that of the piston 31.

[0034] The hammering assembly 3 and the conveying assembly 4 form a coordinated mechanism. This mechanism relies on the pressure changes inside the distillation container 5 to control the relative position of the hammering assembly 3. Specifically, as the pressure inside the distillation container 5 gradually increases, the driving force provided by the pressure causes the heavy ball 33 dragged by the piston 31 to rise relative to the distillation container 5. When the piston 31 approaches and moves away from the outlet hole, it releases the high-pressure steam inside the distillation container 5. Subsequently, based on the gravity of the heavy ball 33, it pulls the piston 31 back to its original position and hammers the toluene waste liquid inside the distillation container 5, causing the toluene waste liquid to slosh and splash onto the side wall of the distillation container 5, thus efficiently utilizing the heat at the side wall of the distillation container 5. In addition, the hammering process fully agitates the toluene waste liquid, thereby releasing more effective toluene components.

[0035] In specific implementation, the conveying assembly 4 includes an obliquely arranged sleeve 44, which is installed at the distillation container 5. A plug 41 is sleeved at the end of the sleeve 44 away from the distillation container 5. A spring 42 is fixed at the end of the plug 41 facing the tube cavity. The spring 42 is used to abut against the piston 31. The conveying assembly 4 also includes a pulley group 45, which is arranged at the bend inside the sleeve 44. The pulley group 45 is movably connected to the traction rope 32 and is used to support the traction rope 32.

[0036] like Figure 1and 3 As shown, the sleeve 44 and piston 31 form a sliding mechanism that is matched with each other. In this sliding mechanism, piston 31 is the structure most directly affected by pressure changes. That is, when the gas pressure inside the distillation container 5 increases, piston 31 is pulled by pressure to bring the heavy ball 33 closer to spring 42. Conversely, when the gas pressure decreases, the heavy ball 33 pulls piston 31 in the opposite direction. Therefore, based on the properties of piston 31, the heavy ball 33 can be repeatedly manipulated to hammer the toluene waste liquid during the cycle of accumulating and releasing gas pressure, so as to make full use of the excess heat at the side wall of distillation container 5.

[0037] like Figure 3 As shown, a pulley block 45 is installed at the sleeve 44. The arrangement of the pulley block 45 firstly supports the traction rope 32, preventing the rope from sliding and rubbing against the inner wall of the sleeve 44. Secondly, the rolling friction between the pulley block 45 and the traction rope 32 allows for a more sensitive perception of the driving force provided by the air pressure.

[0038] In specific implementation, the conveying assembly 4 also includes a limiting strip 43. The limiting strip 43 is fixedly connected to the sleeve 44 along the sliding direction of the piston 31. The limiting strip 43 is slidably adapted to the piston 31 and is used to restrict the piston 31 from overturning.

[0039] In specific implementation, a connecting pipe 2 for transmitting steam is provided between the cooling component 1 and the conveying component 4. The two ends of the connecting pipe 2 are connected to the cooling component 1 and the conveying component 4 respectively, and one end of the connecting pipe 2 is arranged at a lower position than the conveying component 4, while the other end of the connecting pipe 2 is arranged at a higher position than the cooling component 1.

[0040] like Figure 1 and 3 As shown, the connecting pipe 2 is a communication structure between the cooling component 1 and the conveying component 4. The communication structure is designed to introduce toluene vapor into the cooling component 1, which facilitates the liquefaction of toluene vapor by the cooling component 1.

[0041] In specific implementation, the cooling component 1 includes a cooling pipe 13, and a condenser pipe 12 is sleeved inside the cooling pipe 13. One end of the condenser pipe 12 is connected to the connecting pipe 2, and the other end of the condenser pipe 12 passes through the cooling pipe 13 and extends outward.

[0042] The cooling assembly 1 also includes a coolant inlet pipe 11 and a coolant outlet pipe 14, which are distributed vertically and are connected to the cooling pipe 13.

[0043] like Figure 3 As shown, the condenser tube 12 and the cooling tube 13 are two isolated structures. That is, the condenser tube 12 is placed inside the cooling tube 13. The main function is to use the coolant flowing inside the cooling tube 13 to carry heat in order to cool and liquefy the steam inside the condenser tube 12.

[0044] In a specific implementation, the distillation container 5 includes a heating jacket 53, and a container body 54 is sleeved inside the heating jacket 53. A cavity for retaining steam is formed between the container body 54 and the heating jacket 53. A manifold 52 is provided above the container body 54 for guiding and discharging steam.

[0045] The distillation container 5 also includes a steam inlet pipe 51 and a steam outlet pipe 55, which are distributed vertically and extend into the cavity through the heating jacket 53.

[0046] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A toluene recovery device for epoxy resin production, characterized in that: It includes a connecting pipe (2) and a conveying assembly (4), which are distributed on the left and right sides of the distillation container (5). The connecting pipe (2) is isolated from the distillation container (5), and the conveying assembly (4) is connected to the distillation container (5). A hammering assembly (3) is installed inside the conveying assembly (4). The hammering assembly (3) includes a piston (31) and a heavy ball (33) for sealing and sliding with the conveying assembly (4). The heavy ball (33) is placed inside the distillation container (5) and is connected to the piston (31) through a traction rope (32). A drain hole is provided at the conveying assembly (4) for discharging the gas pressure accumulated when the heavy ball (33) moves upward.

2. The toluene recovery device for epoxy resin production according to claim 1, characterized in that: The weight of the ball (33) is greater than the weight of the piston (31).

3. The toluene recovery device for epoxy resin production according to claim 1, characterized in that: The delivery assembly (4) includes an obliquely arranged sleeve (44), which is installed at the distillation container (5). A plug (41) is sleeved at the end of the sleeve (44) away from the distillation container (5). A spring (42) is fixed at the end of the plug (41) facing the tube cavity. The spring (42) is used to abut against the piston (31). The conveying assembly (4) also includes a pulley block (45), which is arranged at the bend inside the sleeve (44). The pulley block (45) is movably connected to the traction rope (32) and is used to support the traction rope (32).

4. The toluene recovery device for epoxy resin production according to claim 1, characterized in that: The conveying assembly (4) also includes a limiting strip (43), which is fixedly connected to the sleeve (44) along the sliding direction of the piston (31). The limiting strip (43) is slidably adapted to the piston (31) and is used to restrict the piston (31) from flipping.

5. The toluene recovery device for epoxy resin production according to claim 1, characterized in that: A connecting pipe (2) for transmitting steam is provided between the cooling component (1) and the conveying component (4). The two ends of the connecting pipe (2) are connected to the cooling component (1) and the conveying component (4) respectively. One end of the connecting pipe (2) is arranged at a lower position than the conveying component (4), and the other end of the connecting pipe (2) is arranged at a higher position than the cooling component (1).

6. The toluene recovery device for epoxy resin production according to claim 5, characterized in that: The cooling assembly (1) includes a cooling pipe (13), a condenser pipe (12) is sleeved inside the cooling pipe (13), one end of the condenser pipe (12) is connected to the connecting pipe (2), and the other end of the condenser pipe (12) passes through the cooling pipe (13) and extends outward.

7. A toluene recovery device for epoxy resin production according to claim 6, characterized in that: The cooling assembly (1) further includes a coolant inlet pipe (11) and a coolant outlet pipe (14), which are distributed vertically and are connected to the cooling pipe (13).

8. The toluene recovery device for epoxy resin production according to claim 1, characterized in that: The distillation container (5) includes a heating jacket (53), and a container body (54) is fitted inside the heating jacket (53). A cavity for storing steam is formed between the container body (54) and the heating jacket (53). A manifold (52) is provided above the container body (54) for guiding and discharging steam.

9. A toluene recovery device for epoxy resin production according to claim 8, characterized in that: The distillation container (5) also includes a steam inlet pipe (51) and a steam outlet pipe (55), which are distributed vertically and extend into the cavity through the heating jacket (53).

10. A recovery method for a toluene recovery device in epoxy resin production as described in any one of claims 1-9, characterized in that, The recycling process includes the following steps: 1) Inject the toluene waste liquid into the container body, and then guide the steam for heating into the cavity between the container body and the heating jacket to heat the toluene waste liquid; 2) During heating, the toluene waste liquid diffuses outward in the form of vapor. During diffusion, the driving force provided by the gas pressure causes the heavy ball dragged by the piston to rise relative to the container body. When the piston approaches the outlet hole at the sleeve and moves away from the outlet hole, the high-pressure vapor inside the container body is released. 3) After the high-pressure steam is released, based on the setting that the weight ball is larger than the piston, the piston is dragged back to reset, and the weight ball hammers the toluene waste liquid in the container body, causing the toluene waste liquid to slosh and splash onto the side wall of the container body, so as to efficiently utilize the heat at the side wall of the container body. 4) High-pressure steam inside the container is introduced into the condenser tube through the connecting pipe. The condenser tube comes into contact with the coolant through the built-in cooling pipe to cool and liquefy the high-pressure steam, and the liquefied product is toluene solution.

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