Esterification kettle reactor

Abstract

The present application relates to the field of polyester production equipment, and specifically discloses an esterification kettle reactor, which includes an upper reactor, wherein the upper reactor is provided with a first baffle mechanism for extending the flow path of the slurry; a lower reactor, wherein the lower reactor is provided with a reflux pipe and a feed pipe, wherein one end of the reflux pipe is connected to the upper reactor, and the other end of the reflux pipe is connected to the feed port, a pump body is provided on the reflux pipe, one end of the feed pipe is connected to the reflux pipe, and the other end of the feed pipe is connected to the interior of the lower reactor, wherein the lower reactor is provided with a second baffle mechanism; a jacket, wherein steam circulates in the jacket; and a knocking mechanism for knocking the cone shell and the tray. The present application replaces the stirring in the traditional method with an external circulation, thereby reducing energy consumption while ensuring the mixing effect on the slurry; and can also reduce the solid particles deposited at the annular hole by knocking vibration to ensure the smooth flow of the slurry.

Description

Technical Field

[0001] The present application relates to the field of polyester production equipment, and in particular to an esterification kettle reactor. Background Art

[0002] Polyester is a general term for polymers obtained by polycondensation of polyols and polyacids, mainly referring to polyethylene terephthalate (PET), and also conventionally including polybutylene terephthalate (PBT) and polyarylate, etc. It is a type of engineering plastics with excellent performance and wide applications. The esterification reactor is an important place for polyester synthesis. Its task is to complete the esterification reaction of the slurry in the esterification reactor to prepare for the subsequent pre-shrinkage and final shrinkage, so as to ensure that the final polycondensation reactor can produce qualified products.

[0003] Polyethylene terephthalate (PET) is a high polymer obtained by the dehydration condensation reaction of ethylene terephthalate. Ethylene terephthalate is obtained by the esterification reaction of terephthalic acid (PTA) and ethylene glycol (EG). The esterification reaction is usually carried out in an esterification kettle reactor. The traditional esterification kettle reactor usually includes two reactors, which are connected by a pipeline. The esterification reaction is carried out successively in the two reactors; the reactor is a stirred reactor with a stirrer inside, so the energy consumption is relatively large. Summary of the invention

[0004] In order to reduce the energy consumption of a reaction kettle, the present application provides an esterification kettle reactor.

[0005] The present application provides an esterification kettle reactor adopts the following technical solution: An esterification kettle reactor comprises an upper reactor, wherein the upper reactor is provided with a feed inlet, and the upper reactor is provided with a first baffle mechanism, wherein the first baffle mechanism is used to extend the flow path of the slurry; A lower reactor is arranged below the upper reactor, a reflux pipe and a feed pipe are arranged in the lower reactor, one end of the reflux pipe is connected with the upper reactor, the other end of the reflux pipe is connected with the feed port, a pump body is arranged on the reflux pipe, one end of the feed pipe is connected with the reflux pipe, the other end of the feed pipe is connected with the interior of the lower reactor, and a second baffle mechanism is arranged in the lower reactor; The second deflection mechanism includes a cone shell and a tray, the cone shell and the tray are both sleeved on the outside of the reflux pipe, the tray is fixedly connected to the reflux pipe, the tray is located below the cone shell, the cone shell is provided with an annular hole, the reflux pipe is passed through the annular hole, and the diameter of the reflux pipe is smaller than the diameter of the annular hole; A jacket is arranged on the outer walls of the upper reaction kettle and the lower reaction kettle, and steam circulates in the jacket; The knocking mechanism includes a first knocking member, a second knocking member, a gear, a rack, a spring and a driving assembly. The gear is rotatably arranged on the inner side of the lower reactor. Only part of the teeth are arranged on the gear. The rack is slidably arranged on the inner side of the lower reactor. Two racks are arranged in parallel and spaced apart. The two racks are respectively located on both sides of the gear. The rack is used to mesh with the gear. The first knocking member is arranged on one of the racks, and the second knocking member is arranged on the other rack. One end of the spring is connected to the rack. The spring makes the first knocking member press against the bottom wall of the cone shell, and the second knocking member presses against the top wall of the tray. The driving assembly is used to drive the gear to rotate.

[0006] By adopting the above technical scheme, the first baffle mechanism in the upper reactor prolongs the flow path of the slurry, increases the mixing and reaction time of terephthalic acid and ethylene glycol in the slurry, and helps to improve the efficiency of the esterification reaction; the reflux pipe can make the slurry circulate, and replace the traditional stirring method by the external circulation of the slurry, which helps to reduce the energy consumption of the system while ensuring the slurry mixing effect; the cone shell and the tray in the second baffle mechanism increase the turbulence of the slurry, which is conducive to further mixing of the slurry and extending the reaction time, thereby increasing the esterification reaction rate; the steam circulating in the jacket provides a stable heat source for the reaction, ensures the reaction rate, and thus optimizes the reaction conditions; the knocking mechanism can knock on the cone shell and the tray, and knocking on the cone shell can make the cone shell vibrate, and shake off the solid particles deposited on the wall of the cone shell at the annular hole, and knocking on the tray can make the tray and the reflux pipe vibrate, and shake off the solid particles deposited on the outer wall of the reflux pipe, thereby reducing the solid particles deposited on the side wall of the annular hole, which helps to maintain the smooth flow of the slurry and reduce maintenance costs and downtime.

[0007] Optionally, the first knocking member includes a first connecting frame and a first knocking rod, the first knocking rod is fixedly connected to the first connecting frame, and the first knocking rod is provided in plurality and arranged in an array, and the second knocking member includes a second connecting frame and a second knocking rod, the second knocking rod is fixedly connected to the second connecting frame, and the second knocking rod is provided in plurality and arranged in an array.

[0008] By adopting the above technical solution, it can be ensured that multiple knocking points can be generated over a larger area each time the knocking occurs, so that the cone shell and the reflux pipe can be vibrated more effectively, thereby better vibrating off the solid particles deposited on the wall surface of the annular hole.

[0009] Optionally, the driving assembly includes a guide shell, a wind shield, a rotating rod, a support rod and a wind shield sheet, the guide shell is arranged on the inner wall of the lower reactor, the guide shell includes a shell and an air inlet pipe and an exhaust pipe arranged on both sides of the shell, the air inlet pipe and the exhaust pipe are both connected to the interior of the jacket on the outside of the lower reactor, the wind shield is fixedly connected to the exhaust pipe, so that the steam in the jacket can flow into the shell from the air inlet pipe and flow out from the exhaust pipe, the rotating rod is rotatably connected to the shell, the rotating rod is coaxially fixedly connected to the gear, the support rod is fixedly connected to one end of the rotating rod located in the shell, and the wind shield sheet is fixedly connected to the support rod, so that the steam flowing in the guide shell can drive the wind shield sheet to rotate.

[0010] By adopting the above technical solution, the driving component uses the steam in the jacket as a power source. When the steam enters the guide shell from the air inlet pipe and is discharged through the exhaust pipe, it can drive the wind shield to rotate, and then drive the rotating rod and the gear to rotate synchronously, thereby realizing non-electric drive, reducing energy consumption, and ensuring the stable rotation of the gear, effectively controlling the operating frequency of the first knocking member and the second knocking member, making it difficult for the ring hole to be blocked or solid particles to accumulate, thereby improving the reliability of the esterification kettle reactor.

[0011] Optionally, the first deflection mechanism includes a guide cylinder, an overflow cylinder and a conical plate, the guide cylinder and the overflow cylinder are both fixedly connected to the upper reaction kettle, the guide cylinder is sleeved on the outside of the overflow cylinder at intervals, a drainage hole is opened on the guide cylinder, and the conical plate is fixedly connected to the top wall of the guide cylinder.

[0012] By adopting the above technical solution, the slurry first flows into the top of the conical plate, then flows downward along the conical plate and falls between the guide cylinder and the upper reactor, and the slurry then penetrates into the guide cylinder and the overflow cylinder through the drainage hole. As the liquid level between the guide cylinder and the overflow cylinder rises, the slurry flows into the interior of the overflow cylinder again, thereby effectively guiding the flow path of the slurry in the upper reactor, so that the slurry can be evenly distributed and fully contacted and mixed, which helps to enhance the reaction effect of the esterification reaction and generate more products.

[0013] Optionally, a mixing assembly is provided on the first connecting frame, and the mixing assembly includes a push rod and a fan-shaped piece. The push rod is fixedly connected to the first connecting frame, and the push rod is slidably passed through the conical shell. The fan-shaped piece is located on the side of the conical shell away from the first connecting frame, and the fan-shaped piece is provided on the push rod. A plurality of fan-shaped pieces are provided and arranged in a circular array.

[0014] By adopting the above technical solution, when the first knocking piece slides, it can drive the push rod to slide, and the push rod drives the fan-shaped pieces to slide, thereby forming local turbulence, which can promote the full mixing of the slurry; multiple fan-shaped pieces arranged in a circular array further enhance the mixing effect, ensure that the slurry is evenly distributed during the esterification process, and improve the reaction efficiency and product quality; in addition, the sliding connection between the push rod and the cone shell can also guide the sliding of the first knocking piece, which helps to improve the stability of the first knocking piece during the sliding process.

[0015] Optionally, the sector piece is rotatably connected to the push rod so that when the first connecting frame slides toward the side away from the cone shell, the sector piece is horizontally arranged, and when the first connecting frame slides toward the side close to the cone shell, the sector piece is vertically arranged.

[0016] By adopting the above technical solution, when the first connecting frame slides to the side away from the cone shell, the fan-shaped pieces are arranged horizontally, which can increase the contact area between the fan-shaped pieces and the slurry in the vertical direction and enhance the pushing and mixing effect on the slurry; when the first connecting frame slides to the side close to the cone shell, the fan-shaped pieces are arranged vertically, thereby reducing the contact area between the fan-shaped pieces and the slurry in the vertical direction, thereby reducing the resistance encountered by the fan-shaped pieces during the sliding process, and weakening the influence of the setting of the fan-shaped pieces on the resetting process of the first knocking piece, thereby ensuring the knocking vibration effect of the first knocking piece on the cone shell.

[0017] Optionally, a leakage hole is provided on the fan-shaped piece.

[0018] By adopting the above technical solution, the resistance encountered by the fan-shaped pieces during sliding can be further reduced; the design of the leakage hole reflux can also help to achieve uniform distribution of the slurry, further improving the mixing effect.

[0019] Optionally, a heater is provided on the outer side of the reflux pipe.

[0020] By adopting the above technical solution, the heater can effectively increase the temperature of the slurry in the reflux pipe. The heated slurry in the reflux pipe is then mixed with the slurry in the upper reactor, which can further enhance the heating effect on the slurry in the upper reactor and help accelerate the esterification reaction of the slurry.

[0021] Optionally, a heating coil is provided in the lower reaction kettle, and the heating coil is sleeved on the outside of the reflux pipe.

[0022] By adopting the above technical scheme, the heating coil can heat the slurry in the lower reaction kettle and the slurry in the reflux pipe, thereby further ensuring the reaction temperature; in addition, since the second knocking rod knocks on the tray, not only the solid particles deposited on the outer wall of the reflux pipe at the annular hole can be vibrated off, but also the solid particles attached to the inner wall of the reflux pipe can be vibrated off, thereby ensuring the heating effect of the heating coil on the slurry in the reflux pipe.

[0023] Optionally, a first exhaust port is disposed at the top of the upper reaction kettle, and a liquid baffle plate is disposed in the upper reaction kettle, and the liquid baffle plate is spaced below the first exhaust port.

[0024] By adopting the above technical solution, the liquid baffle plate can block the liquid droplets mixed in the gas, so that a part of the liquid droplets can adhere to the liquid baffle plate and then drip into the upper reactor, thereby reducing the amount of slurry discharged along with the gas.

[0025] In summary, this application includes the following beneficial technical effects: 1. External circulation is used to replace the traditional stirring method, thereby ensuring the mixing effect of the slurry while reducing energy consumption; the first baffle mechanism and the second baffle mechanism can prolong the residence time of the slurry inside the reactor, so that the terephthalic acid and ethylene glycol in the slurry can be more fully mixed and reacted, which helps to increase the output of the product.

[0026] 2. The knocking mechanism can knock on the bottom wall of the cone shell to make the cone shell vibrate, and shake off the solid particles deposited on the wall surface of the cone shell at the annular hole. The knocking mechanism can also knock on the tray to make the tray and the return pipe vibrate, and shake off the solid particles deposited on the outer wall of the return pipe at the annular hole, so that the solid particles are not easily accumulated at the annular hole and cause the annular hole to be blocked, which helps to ensure the smooth flow of the slurry and thus ensure the normal operation of the device.

[0027] 3. The steam circulating in the jacket outside the lower reactor can drive the wind shield to rotate, so that the support rod and the rotating rod rotate, thereby driving the gear to rotate. Therefore, the rotation of the gear does not require an additional power source, which helps to reduce energy consumption.

[0028] 4. The first knocking piece can drive the push rod and the fan-shaped piece to slide when sliding, and the fan-shaped piece can push and mix the slurry in the lower reaction kettle, further enhancing the mixing effect of the slurry, so that the slurry can react more fully. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 is a cross-sectional view of an embodiment of the present application; Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 It is a structural schematic diagram of the embodiment of the present application for showing the striking mechanism; Figure 5 This is a structural schematic diagram of an embodiment of the present application for illustrating the positional relationship between the mounting block and the guide housing; Figure 6 It is a schematic diagram of the structure of the embodiment of the present application for showing the gear and the rack; Figure 7 is a cross-sectional view from another perspective of the embodiment of the present application; Figure 8 yes Figure 7 The enlarged schematic diagram of point B in the middle; Fig. 9 It is a schematic diagram of the structure of the mixing component in the embodiment of the present application.

[0030] Figure numerals: 1, upper reactor; 11, feed port; 12, first exhaust port; 2, first baffle mechanism; 21, guide cylinder; 211, drainage hole; 22, overflow cylinder; 23, conical plate; 3, lower reactor; 31, discharge cylinder; 32, discharge port; 33, third exhaust port; 4, reflux pipe; 41, inner pipe; 42, outer pipe; 5, feed pipe; 51, horizontal part; 52, arc-shaped part; 521, regulating valve; 6, pump body; 7, second baffle mechanism; 71, cone shell; 711, annular hole; 72, tray; 8, jacket; 9, knocking mechanism; 91, first knocking piece; 911, first connecting frame; 912, first knocking A striking rod; 92, a second striking member; 921, a second connecting frame; 922, a second striking rod; 93, a gear; 94, a rack; 95, a spring; 96, a driving assembly; 961, a guide shell; 9611, a shell; 9612, an air inlet pipe; 9613, an exhaust pipe; 962, a wind shield; 963, a rotating rod; 964, a supporting rod; 965, a wind shield; 10, a mixing assembly; 101, a push rod; 1011, a stopper; 102, a fan-shaped piece; 1021, a liquid leakage hole; 13, a heater; 14, a heating coil; 15, a liquid shield; 16, a branch pipe; 161, a second exhaust port; 17, a mounting block; 18, an air guide pipe. DETAILED DESCRIPTION

[0031] The following combination Figure 1-Figure 9 This application is described in further detail.

[0032] The present application embodiment discloses an esterification kettle reactor. Figure 1 and Figure 2The esterification kettle reactor includes an upper reactor 1 and a lower reactor 3. The upper reactor 1 is fixedly connected to the upper part of the lower reactor 3. Both the upper reactor 1 and the lower reactor 3 are cylindrical structures with vertical axes. A feed port 11 is provided on the side wall of the upper reactor 1, so that the slurry of terephthalic acid and ethylene glycol mixed can be fed into the upper reactor 1 for a preliminary esterification reaction.

[0033] Reference Figure 2 , a first exhaust port 12 is provided on the top of the upper reactor 1, and an exhaust valve is provided at the first exhaust port 12. A liquid baffle plate 15 is fixedly connected to the top wall inside the upper reactor 1 below the first exhaust port 12, and the liquid baffle plate 15 and the first exhaust port 12 are arranged at intervals, and the liquid baffle plate 15 is in the shape of a spherical shell. Therefore, the liquid baffle plate 15 can block the gas discharged upward, so that a part of the droplets in the gas can adhere to the bottom wall of the liquid baffle plate 15, and then drip into the upper reactor 1, thereby reducing the raw material liquid discharged outward with the gas. A jacket 8 is provided on the outer wall of the upper reactor 1, and steam circulates in the jacket 8, so that the slurry in the upper reactor 1 can be heated through the jacket 8, which helps to accelerate the esterification reaction between terephthalic acid and ethylene glycol inside.

[0034] The upper reactor 1 is provided with a first baffle mechanism 2, which includes a guide cylinder 21, an overflow cylinder 22 and a conical plate 23. The guide cylinder 21 and the overflow cylinder 22 are both cylinders, and are coaxially arranged with the upper reactor 1. The bottom ends of the guide cylinder 21 and the overflow cylinder 22 are fixedly connected to the bottom wall inside the upper reactor 1. The guide cylinder 21 is sleeved on the outside of the overflow cylinder 22 at intervals, and the guide cylinder 21 and the inner wall of the upper reactor 1 are arranged at intervals. A drainage hole 211 is provided on the guide cylinder 21, and a plurality of drainage holes 211 are provided and arranged in an array. The conical plate 23 is conical, and the conical plate 23 is located above the guide cylinder 21, and the diameter of the bottom end of the conical plate 23 is the same as the cylinder diameter of the guide cylinder 21. The bottom edge of the conical plate 23 and the top edge of the guide cylinder 21 are welded and fixed, so that the overflow cylinder 22 is located inside the sealing area formed by the guide cylinder 21 and the conical plate 23 .

[0035] Therefore, after the slurry is put into the upper reactor 1 through the feed port 11, the slurry can flow downward along the top wall of the conical plate 23, and then flow into the space between the guide cylinder 21 and the inner wall of the upper reactor 1; the slurry then penetrates into the space between the guide cylinder 21 and the overflow cylinder 22 through the drainage hole 211 on the guide cylinder 21. As the liquid level between the guide cylinder 21 and the overflow cylinder 22 rises, when the liquid level is higher than the overflow cylinder 22, the slurry can pass over the overflow cylinder 22 and flow into the interior of the overflow cylinder 22.

[0036] In order to facilitate the discharge of the gas in the closed cavity formed between the guide cylinder 21, the conical plate 23 and the bottom wall of the upper reactor 1, a branch pipe 16 is fixedly connected to the top of the conical plate 23. The branch pipe 16 is vertically arranged, and the bottom end of the branch pipe 16 is connected to the cavity below the conical plate 23. A second exhaust port 161 is arranged on the top of the branch pipe 16, so that the gas in the cavity below the conical plate 23 can flow into the cavity above the conical plate 23 through the branch pipe 16 and the second exhaust port 161, and the gas passes over the liquid baffle plate 15 and is discharged through the first exhaust port 12.

[0037] The bottom of the upper reactor 1 is fixedly connected with a reflux pipe 4, which includes an inner pipe 41 and an outer pipe 42. The inner pipe 41 is coaxially arranged in the lower reactor 3, the top of the inner pipe 41 is fixedly connected to the bottom wall of the upper reactor 1, and the inner pipe 41 is connected to the inside of the overflow tube 22 in the upper reactor 1. The outer pipe 42 is located outside the lower reactor 3, one end of the outer pipe 42 penetrates into the lower reactor 3 and is fixedly connected to the bottom end of the inner pipe 41, and the other end of the outer pipe 42 is connected to the feed port 11 on the upper reactor 1. The outer pipe 42 is provided with a pump body 6, so that the pump body 6 can draw the slurry inside the overflow tube 22 in the upper reactor 1 into the reflux pipe 4, and the slurry in the reflux pipe 4 flows into the feed port 11 again, thereby forming an external circulation, so that the slurry can be more fully mixed and reacted. During the operation of the device, the slurry in the reflux pipe 4 is in a full state.

[0038] A heater 13 is disposed on the outer side of the lower reaction kettle 3 , and the heater 13 is disposed on the outer side of the outer tube 42 , so that the heater 13 can heat the slurry in the outer tube 42 , thereby enhancing the heating effect on the slurry.

[0039] The lower reactor 3 is also provided with a feed pipe 5, and two feed pipes 5 are provided and are respectively located on both sides of the lower reactor 3. The feed pipe 5 includes a horizontal portion 51 and an arc portion 52, the horizontal portion 51 is located inside the lower reactor 3, one end of the horizontal portion 51 is fixedly connected to the inner tube 41, and the horizontal portion 51 is communicated with the inner tube 41; the other end of the horizontal portion 51 is fixedly connected to the arc portion 52, the arc portion 52 is located outside the lower reactor 3, and the other end of the arc portion 52 is communicated with the inside of the lower reactor 3. A regulating valve 521 is provided on the arc portion 52, and the regulating valve 521 can adjust the slurry flow in the feed pipe 5. Therefore, when the device is working, the slurry inside the overflow tube 22 in the upper reactor 1 can flow into the inner tube 41, and the inner tube 41 is filled with circulating slurry. Most of the slurry in the inner tube 41 circulates into the feed port 11 of the upper reactor 1 through the outer tube 42, and a small part of the slurry in the inner tube 41 can flow into the lower reactor 3 through the horizontal portion 51 and the arc portion 52.

[0040] The lower reactor 3 is provided with a second baffle mechanism 7, which includes a cone shell 71 and a tray 72. The cone shell 71 and the tray 72 are both located below the feed pipe 5. Two cone shells 71 are provided and are arranged at intervals in the vertical direction; two trays 72 are provided, and each tray 72 corresponds to a cone shell 71. The outer side of the cone shell 71 is higher and the inner side is lower. The outer edge of the cone shell 71 is fixedly connected to the inner wall of the lower reactor 3, and the inner side of the cone shell 71 is coaxially provided with an annular hole 711. The diameter of the annular hole 711 is larger than the outer diameter of the inner tube 41, and the inner tube 41 is coaxially inserted into the annular hole 711. The tray 72 is a disc, and the tray 72 is coaxially fixedly connected to the outer wall of the inner tube 41. The tray 72 is located below the cone shell 71, and the outer edge of the tray 72 and the inner wall of the lower reactor 3 are arranged at intervals. Therefore, the slurry flowing into the lower reaction kettle 3 through the feeding pipe 5 can first flow into the top surface of the cone shell 71, and then flow to the inner side of the cone shell 71 along the inclined direction of the cone shell 71, and then the slurry seeps downward through the annular hole 711, and then falls on the top wall of the tray 72. As the liquid level in the tray 72 rises, the slurry in the tray 72 can overflow downward and then fall above the next cone shell 71. Then the slurry seeps into the next tray 72 through the annular hole 711, and then overflows from the tray 72 and falls to the bottom of the lower reaction kettle 3.

[0041] A discharge barrel 31 is fixedly connected to the bottom wall inside the lower reactor 3. The discharge barrel 31 is coaxially sleeved on the outer side of the inner tube 41, and the discharge barrel 31 and the inner tube 41 are arranged at intervals. A discharge port 32 is arranged on the bottom wall of the lower reactor 3, and a valve is arranged on the discharge port 32; the cavity between the discharge barrel 31 and the inner tube 41 is connected to the discharge port 32. Therefore, the slurry overflowing from the tray 72 can fall to the bottom of the lower reactor 3, and then the slurry accumulates at the bottom of the lower reactor 3, so that the liquid level at the bottom of the lower reactor 3 rises; when the liquid level is higher than the top of the discharge barrel 31, the slurry flows between the discharge barrel 31 and the inner tube 41, and then is discharged from the discharge port 32. A drain valve is also arranged on the bottom wall of the lower reactor 3. When the device stops using, the drain valve can be opened to discharge the slurry accumulated at the bottom of the lower reactor 3 and empty the interior of the lower reactor 3.

[0042] Therefore, the setting of the second baffle mechanism 7 can further prolong the time that the slurry stays in the lower reactor 3, so that the slurry can further undergo esterification reaction. The jacket 8 is also covered on the outside of the lower reactor 3, so that the slurry in the lower reactor 3 can be heated. In addition, a heating coil 14 is fixedly arranged in the lower reactor 3, and a plurality of heating coils 14 are arranged; the heating coil 14 is sleeved on the outside of the inner tube 41, so that the heating coil 14 can not only heat the slurry in the lower reactor 3, but also heat the slurry in the inner tube 41, thereby accelerating the esterification reaction rate.

[0043] In order to facilitate the discharge of the gas in the lower reactor 3, a third exhaust port 33 is provided on the side wall at the top of the lower reactor 3, and a valve is provided at the third exhaust port 33. An air guide pipe 18 is fixedly connected to the cone shell 71, and the air guide pipe 18 is vertically arranged and penetrates the cone shell 71. Therefore, the gas in the cavity below the cone shell 71 can flow into the top of the cone shell 71 through the air guide pipe 18, and then be discharged through the third exhaust port 33.

[0044] Since it is necessary to extend the residence time of the slurry in the lower reactor 3, the gap between the annular hole 711 on the conical shell 71 and the outer wall of the inner tube 41 is small, so that the amount of slurry seeping downward through the gap between the annular hole 711 and the inner tube 41 is small, and the slurry flow rate seeping downward through the annular hole 711 and the slurry flow rate entering the lower reactor 3 through the feeding pipe 5 reach a dynamic balance, so that the slurry above the conical shell 71 can maintain a relatively stable liquid level, and the heating coil 14 is submerged in the slurry above the conical shell 71, which can extend the residence time of the slurry while ensuring the heating effect of the heating coil 14.

[0045] Since the gap between the annular hole 711 and the inner tube 41 is small, and terephthalic acid is in powder form, after the slurry mixed with terephthalic acid and ethylene glycol flows for a long time, solid particles are easily deposited on the inner wall of the annular hole 711 and the outer wall of the inner tube 41, which reduces the gap between the two and affects the original dynamic balance; if the purpose is to ensure the stability of the liquid level, the flow rate of the slurry discharged from the feeding pipe 5 needs to be reduced after the gap is reduced, which will result in a reduction in the flow rate of the slurry discharged through the discharge port 32, affecting the subsequent work efficiency. In addition, the regulating valve 521 needs to be adjusted in time, which is inconvenient. In order to reduce this effect, a knocking mechanism 9 is provided in the lower reactor 3, and the knocking mechanism 9 can knock on the cone shell 71 and the tray 72. When the cone shell 71 is knocked, the cone shell 71 can be vibrated, and when the tray 72 is knocked, the inner tube 41 can be vibrated, thereby vibrating off the solid particles attached to the outer walls of the cone shell 71 and the inner tube 41, so that it is not easy for debris to accumulate on the outer walls of the cone shell 71 and the inner tube 41, which helps to ensure the smooth flow of the slurry, thereby ensuring the normal operation of the device.

[0046] Reference Figure 3 and Figure 4 The knocking mechanism 9 includes a first knocking member 91, a second knocking member 92, a gear 93, a rack 94, a spring 95 and a driving assembly 96. The first knocking member 91 includes a first connecting frame 911 and a first knocking rod 912. The first knocking rod 912 is fixedly connected to the top wall of the first connecting frame 911. A plurality of first knocking rods 912 are provided, and the top end of the first knocking rod 912 is used to abut against the bottom wall of the cone shell 71. Therefore, when the first connecting frame 911 slides, the first knocking rod 912 can be driven to slide, so that the bottom wall of the cone shell 71 is knocked by the top end of the first knocking rod 912.

[0047] The second knocking member 92 includes a second connecting frame 921 and a second knocking rod 922, wherein the second knocking rod 922 is fixedly connected to the bottom wall of the second connecting frame 921, and a plurality of second knocking rods 922 are provided, and the bottom end of the second knocking rod 922 is used to abut against the top wall of the tray 72. Therefore, when the second connecting frame 921 slides, the second knocking rod 922 can be driven to slide, thereby knocking the top wall of the tray 72 through the bottom end of the second knocking rod 922.

[0048] Reference Figure 4 , Figure 5 and Figure 6 The inner wall of the lower reaction kettle 3 is fixedly connected with a mounting block 17, and a receiving groove is provided on the mounting block 17. The gear 93 is rotatably connected in the receiving groove. The axis of the gear 93 is horizontal, and only a part of the teeth are provided on the gear 93. Two racks 94 are provided, and are respectively located on both sides of the gear 93; the mounting block 17 is provided with two vertical slide grooves, and the two racks 94 are slidably provided in the two slide grooves. The slide groove is connected with the receiving groove, and the teeth of the two racks 94 face the side close to each other, and the racks 94 are used to mesh with the gear 93. The first connecting frame 911 is fixedly connected to the top end of one of the racks 94, and the second connecting frame 921 is fixedly connected to the bottom end of the other rack 94. Two springs 95 are provided, corresponding to the two racks 94 respectively. One spring 95 is fixedly connected between the rack 94 and the tray 72. This spring 95 is in a compressed state, so that the first knocking rod 912 at the top end of the rack 94 is pressed against the bottom wall of the conical shell 71; the other spring 95 is fixedly connected between the rack 94 and the conical shell 71. This spring 95 is in a compressed state, so that the second knocking rod 922 at the bottom end of the rack 94 is pressed against the top wall of the tray 72.

[0049] The driving assembly 96 is used to drive the gear 93 to rotate continuously. When the teeth on the gear 93 mesh with one of the racks 94, the rack 94 can be moved downward, and the rack 94 drives the first connecting frame 911 and the first knocking rod 912 to move downward, so that the first knocking rod 912 is separated from the contact with the bottom wall of the cone shell 71, and the spring 95 is further compressed. When the teeth on the gear 93 are separated from the meshing with the rack 94, the spring 95 makes the rack 94 move upward, and the rack 94 drives the first connecting frame 911 and the first knocking rod 912 to move upward, so that the first knocking rod 912 can be quickly moved upward and reset under the action of the spring 95 until the top of the first knocking rod 912 is against the bottom wall of the cone shell 71, and the first knocking rod 912 can knock the bottom wall of the cone shell 71, so that the cone shell 71 vibrates, and the solid particles adhered to the inner wall of the annular hole 711 inside the cone shell 71 are shaken off. Then the teeth on the gear 93 mesh with another rack 94, so that the rack 94 moves upward, and the rack 94 drives the second connecting frame 921 and the second knocking rod 922 to move upward, so that the second knocking rod 922 is out of contact with the top wall of the tray 72, and the spring 95 is further compressed. When the teeth on the gear 93 are out of mesh with the rack 94, the spring 95 makes the rack 94 move downward, and the rack 94 drives the second connecting frame 921 and the second knocking rod 922 to move downward, so that the second knocking rod 922 can knock the top wall of the tray 72, so that the tray 72 and the inner tube 41 vibrate, thereby shaking off the solid particles attached to the outer wall of the inner tube 41.

[0050] Reference Figure 7 and Figure 8 The driving assembly 96 includes a guide shell 961, a windshield plate 962, a rotating rod 963, a support rod 964 and a windshield plate 965. The guide shell 961 is fixedly connected to the inner wall of the lower reactor 3, and the guide shell 961 includes a shell 9611, an air inlet pipe 9612 and an exhaust pipe 9613. The air inlet pipe 9612 and the exhaust pipe 9613 are both fixedly connected to the shell 9611, and the air inlet pipe 9612 and the exhaust pipe 9613 are both connected to the inside of the shell 9611; the ends of the air inlet pipe 9612 and the exhaust pipe 9613 away from the shell 9611 are both fixedly connected to the inner wall of the lower reactor 3, and the air inlet pipe 9612 and the exhaust pipe 9613 are both connected to the inside of the jacket 8 outside the lower reactor 3, so that the steam in the jacket 8 can flow into the shell 9611.

[0051] The windshield 962 is fixedly connected to the inner walls of the upper and lower sides of the exhaust pipe 9613. There are multiple windshields 962 and they are evenly spaced. The windshields 962 are tilted, and the windshields 962 on the upper and lower sides are symmetrically arranged. Therefore, the steam flowing from the jacket 8 into the exhaust pipe 9613 will be blocked by the windshield 962, thereby greatly reducing the steam flowing into the shell 9611 through the exhaust pipe 9613; and the steam flowing from the shell 9611 into the exhaust pipe 9613 is not easily blocked because the flow direction is consistent with the tilt direction of the windshield 962, so the steam flowing from the shell 9611 into the exhaust pipe 9613 is not easily blocked and can flow out smoothly. No windshield 962 is set in the air inlet pipe 9612, so the steam in the jacket 8 can smoothly flow into the shell 9611 through the air inlet pipe 9612, and then be discharged from the exhaust pipe 9613, thereby forming a unidirectional flow of steam in the guide shell 961.

[0052] One end of the rotating rod 963 is located in the housing 9611, and the rotating rod 963 is rotatably connected to the housing 9611. The other end of the rotating rod 963 is located outside the housing 9611, and the end of the rotating rod 963 located outside the housing 9611 is coaxially fixedly connected to the gear 93. The support rod 964 is located inside the housing 9611, and the support rod 964 is fixedly connected to the rotating rod 963 in the radial direction; a plurality of support rods 964 are provided and arranged in a circular array. The number of windshields 965 is the same as the number of support rods 964, and each windshield 965 corresponds to a support rod 964, and the windshield 965 is fixedly connected to the support rod 964. The wind shield 965 is arranged in an arc shape, so after the steam in the jacket 8 flows into the interior of the shell 9611 through the air inlet pipe 9612, the high-speed flowing steam can push the wind shield 965 to rotate, and the wind shield 965 drives the rotating rod 963 to rotate through the support rod 964, and the rotating rod 963 drives the gear 93 to rotate, thereby achieving the knocking of the cone shell 71 and the tray 72.

[0053] Reference Figure 3 and Fig. 9 , the first connecting frame 911 is also provided with a mixing assembly 10, and the mixing assembly 10 includes a push rod 101 and a fan-shaped piece 102. The push rod 101 is vertically arranged, and a plurality of push rods 101 are provided, and all are fixedly connected to the top wall of the first connecting frame 911. The top end of the push rod 101 passes through the cone shell 71, and a avoidance hole for the push rod 101 to pass through is provided on the cone shell 71. The fan-shaped piece 102 is arranged at the top end of the push rod 101, and a plurality of fan-shaped pieces 102 on each push rod 101 are provided and arranged in a circular array. One end of the fan-shaped piece 102 is hinged to the push rod 101. The top end of the push rod 101 is fixedly connected with a stopper 1011, and when the fan-shaped piece 102 rotates to a horizontal state, the top wall of the fan-shaped piece 102 abuts against the bottom wall of the stopper 1011, so that the fan-shaped piece 102 can no longer continue to rotate upward after rotating to a horizontal state.

[0054] Therefore, when the first connecting frame 911 slides downward, it can drive the push rod 101 to slide downward, and the push rod 101 drives the fan-shaped piece 102 to slide downward. Since the fan-shaped piece 102 is located in the slurry, the fan-shaped piece 102 will be subject to the resistance of the slurry when sliding downward, so that the fan-shaped piece 102 rotates to a horizontal state. Therefore, the fan-shaped piece 102 in a horizontal state can push and mix the slurry when sliding downward with the push rod 101, so that the slurry is mixed more fully, thereby reacting better. When the first connecting frame 911 slides upward, it can drive the push rod 101 to move upward, and the push rod 101 drives the fan-shaped piece 102 to move upward. Under the action of the resistance of the slurry, the fan-shaped piece 102 will rotate downward to a vertical state, at which time the contact area between the fan-shaped piece 102 and the slurry in the vertical direction can be reduced, and the resistance encountered by the fan-shaped piece 102 when sliding can be reduced, thereby ensuring the knocking vibration effect of the first knocking rod 912 on the cone shell 71.

[0055] Furthermore, a leakage hole 1021 is provided on the sector-shaped piece 102, thereby further reducing the resistance encountered by the sector-shaped piece 102 during the sliding process.

[0056] The implementation principle of an esterification kettle reactor of the present application embodiment is as follows: the slurry after the mixture of terephthalic acid and ethylene glycol is fed into the upper reactor 1 through the feed port 11, and the slurry flows downward along the conical plate 23 to the area between the guide cylinder 21 and the inner wall of the upper reactor 1. Then the slurry flows into the guide cylinder 21 and the overflow cylinder 22 through the drainage hole 211 on the guide cylinder 21. As the slurry flows in, the liquid level between the guide cylinder 21 and the overflow cylinder 22 rises. When the liquid level is higher than the overflow cylinder 22, the slurry can flow into the overflow cylinder 22. Then the slurry inside the overflow cylinder 22 flows into the inner tube 41, and most of the slurry in the inner tube 41 flows into the outer tube 42. After being heated by the heater 13, it is pumped to the feed port 11 of the upper reactor 1, and then flows back into the upper reactor 1, thereby realizing the external circulation of the slurry, making the slurry mixing more fully, which helps to enhance the effect of the esterification reaction.

[0057] A small portion of the slurry in the inner tube 41 will flow into the lower reactor 3 through the feed pipe 5, and then fall onto the top surface of the cone shell 71. The slurry will accumulate on the top surface of the cone shell 71, and the slurry will maintain a certain liquid level. After being heated by the heating coil 14, the slurry above the cone shell 71 will flow downward from the annular hole 711 between the cone shell 71 and the inner tube 41 to the tray 72. As the slurry in the tray 72 increases, the slurry overflows from the tray 72 and falls onto the top surface of the next cone shell 71. The slurry on the top surface of this cone shell 71 will be heated again by the heating coil 14 and then flow downward to the tray 72 through the annular hole 711, and then the slurry overflows from the tray 72 to the bottom of the lower reactor 3. As the liquid level of the slurry at the bottom of the lower reactor 3 increases, the slurry can flow between the discharge tube 31 and the inner tube 41, and then be discharged through the discharge port 32.

[0058] The slurry can undergo esterification reaction in both the upper reactor 1 and the lower reactor 3. The slurry after two esterification reactions is continuously discharged from the discharge port 32 and then flows into the next process for subsequent treatment.

[0059] When the above device is in operation, the steam in the jacket 8 outside the upper reactor 1 and the lower reactor 3 circulates to heat the slurry inside the upper reactor 1 and the lower reactor 3, thereby accelerating the esterification reaction. During the flow of the steam in the jacket 8 outside the lower reactor 3, a portion of the steam will flow into the housing 9611 through the air inlet pipe 9612, causing the wind shield 965 to rotate, and the wind shield 965 drives the rotating rod 963 to rotate through the support rod 964, and the rotating rod 963 drives the gear 93 to rotate continuously. When the teeth on the gear 93 mesh with the rack 94, the gear 93 rotates to drive the rack 94 to slide. When the teeth on the gear 93 disengage from the mesh with the rack 94, the spring 95 resets the rack 94, so that the first knocking rod 912 can knock the cone shell 71 first to shake off the solid particles attached to the ring hole 711 of the cone shell 71; the second knocking rod 922 then knocks the tray 72 to vibrate the tray 72 and the inner tube 41 to shake off the solid particles attached to the outer wall of the inner tube 41 at the ring hole 711. The first knocking rod 912 and the second knocking rod 922 knock intermittently, thereby reducing the solid particles attached to the ring hole 711, making the ring hole 711 less likely to be blocked, which helps to ensure the smooth flow of the slurry at the ring hole 711.

[0060] When the first connecting frame 911 drives the first knocking rod 912 to move downward, the first connecting frame 911 can also drive the push rod 101 to move downward, and the fan-shaped piece 102 on the push rod 101 is in a horizontal state, thereby pushing and mixing the slurry on the top of the cone shell 71, so that the slurry is mixed more fully and the esterification reaction is accelerated. When the first connecting frame 911 moves upward, it drives the push rod 101 to move upward. At this time, the fan-shaped piece 102 on the push rod 101 is in a vertical state, so that the resistance encountered by the push rod 101 during the upward movement can be reduced, thereby ensuring the knocking vibration effect of the first knocking rod 912 on the cone shell 71.

[0061] The above are optional embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An esterification kettle reactor, characterized in that: include: An upper reaction kettle (1), wherein the upper reaction kettle (1) is provided with a feed inlet (11), and wherein a first baffle mechanism (2) is provided in the upper reaction kettle (1), wherein the first baffle mechanism (2) is used to extend a flow path of the slurry; A lower reaction kettle (3) is arranged below the upper reaction kettle (1), and a reflux pipe (4) and a feed pipe (5) are arranged in the lower reaction kettle (3); one end of the reflux pipe (4) is connected to the upper reaction kettle (1), and the other end of the reflux pipe (4) is connected to the feed port (11); a pump body (6) is arranged on the reflux pipe (4), one end of the feed pipe (5) is connected to the reflux pipe (4), and the other end of the feed pipe (5) is connected to the interior of the lower reaction kettle (3); and a second deflection mechanism (7) is arranged in the lower reaction kettle (3); The second deflection mechanism (7) comprises a cone shell (71) and a tray (72), the cone shell (71) and the tray (72) being sleeved on the outside of the return pipe (4), the tray (72) being fixedly connected to the return pipe (4), the tray (72) being located below the cone shell (71), the cone shell (71) being provided with an annular hole (711), the return pipe (4) being passed through the annular hole (711), and the diameter of the return pipe (4) being smaller than the diameter of the annular hole (711); A jacket (8) is arranged on the outer walls of the upper reaction kettle (1) and the lower reaction kettle (3), and steam circulates in the jacket (8); The knocking mechanism (9) comprises a first knocking member (91), a second knocking member (92), a gear (93), a rack (94), a spring (95) and a driving assembly (96), wherein the gear (93) is rotatably arranged on the inner side of the lower reaction kettle (3), the gear (93) is only provided with a part of teeth, the rack (94) is slidably arranged on the inner side of the lower reaction kettle (3), two racks (94) are provided and arranged in parallel at an interval, and the two racks (94) are respectively located on both sides of the gear (93). The rack (94) is used to mesh with the gear (93); the first knocking member (91) is arranged on one of the racks (94); the second knocking member (92) is arranged on the other rack (94); one end of the spring (95) is connected to the rack (94); the spring (95) causes the first knocking member (91) to press against the bottom wall of the cone shell (71) and the second knocking member (92) to press against the top wall of the tray (72); and the driving assembly (96) is used to drive the gear (93) to rotate.

2. An esterification kettle reactor according to claim 1, characterized in that: The first knocking member (91) comprises a first connecting frame (911) and a first knocking rod (912); the first knocking rod (912) is fixedly connected to the first connecting frame (911); a plurality of the first knocking rods (912) are provided and arranged in an array; the second knocking member (92) comprises a second connecting frame (921) and a second knocking rod (922); the second knocking rod (922) is fixedly connected to the second connecting frame (921); a plurality of the second knocking rods (922) are provided and arranged in an array.

3. An esterification kettle reactor according to claim 1, characterized in that: The driving assembly (96) comprises a guide shell (961), a wind shield (962), a rotating rod (963), a supporting rod (964) and a wind shield (965); the guide shell (961) is arranged on the inner wall of the lower reaction kettle (3); the guide shell (961) comprises a shell (9611) and an air inlet pipe (9612) and an air exhaust pipe (9613) arranged on both sides of the shell (9611); the air inlet pipe (9612) and the air exhaust pipe (9613) are both connected to the inside of the jacket (8) outside the lower reaction kettle (3); the wind shield (962) is fixedly connected to the lower reaction kettle (3); The exhaust pipe (9613) is provided so that the steam in the jacket (8) can flow from the air inlet pipe (9612) into the shell (9611) and flow out from the exhaust pipe (9613); the rotating rod (963) is rotatably connected to the shell (9611); the rotating rod (963) is coaxially fixedly connected to the gear (93); the support rod (964) is fixedly connected to one end of the rotating rod (963) located in the shell (9611); and the wind shield (965) is fixedly connected to the support rod (964) so ​​that the steam flowing in the guide shell (961) can drive the wind shield (965) to rotate.

4. An esterification kettle reactor according to claim 1, characterized in that: The first deflection mechanism (2) comprises a guide cylinder (21), an overflow cylinder (22) and a conical plate (23); the guide cylinder (21) and the overflow cylinder (22) are both fixedly connected to the upper reaction kettle (1); the guide cylinder (21) is sleeved on the outside of the overflow cylinder (22) at intervals; a drainage hole (211) is provided on the guide cylinder (21); and the conical plate (23) is fixedly connected to the top wall of the guide cylinder (21).

5. An esterification kettle reactor according to claim 2, characterized in that: A mixing assembly (10) is arranged on the first connecting frame (911), and the mixing assembly (10) comprises a push rod (101) and a fan-shaped piece (102), the push rod (101) being fixedly connected to the first connecting frame (911), the push rod (101) being slidably arranged on the cone shell (71), the fan-shaped piece (102) being located on a side of the cone shell (71) away from the first connecting frame (911), the fan-shaped piece (102) being arranged on the push rod (101), and a plurality of the fan-shaped pieces (102) being arranged in a circular array.

6. An esterification kettle reactor according to claim 5, characterized in that: The fan-shaped piece (102) is rotatably connected to the push rod (101), so that when the first connecting frame (911) slides toward a side away from the cone shell (71), the fan-shaped piece (102) is horizontally arranged, and when the first connecting frame (911) slides toward a side close to the cone shell (71), the fan-shaped piece (102) is vertically arranged.

7. An esterification kettle reactor according to claim 5, characterized in that: The sector-shaped piece (102) is provided with a liquid leakage hole (1021).

8. An esterification kettle reactor according to claim 1, characterized in that: A heater (13) is provided on the outer side of the reflux pipe (4).

9. An esterification kettle reactor according to claim 1, characterized in that: The lower reaction kettle (3) is provided with a heating coil (14), and the heating coil (14) is sleeved on the outside of the reflux pipe (4).

10. An esterification kettle reactor according to claim 1, characterized in that: A first exhaust port (12) is arranged at the top of the upper reaction kettle (1), and a liquid baffle plate (15) is arranged in the upper reaction kettle (1), wherein the liquid baffle plate (15) is arranged below the first exhaust port (12) at intervals.

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