Continuous reaction kettle for esterification of n-propyl acetate

Abstract

The invention relates to the technical field of reaction kettles, and discloses an n-propyl acetate esterification continuous reaction kettle, which comprises a rack and a reaction kettle arranged on the rack, and further comprises three isolation plates used for dividing the interior of the reaction kettle into a plurality of reaction areas, and the three isolation plates are fixed in the reaction kettle; the power part is fixed above the reaction kettle; the piston piece is used for pushing the to-be-reacted stock solution in each reaction area to enter the previous-stage reaction area and is arranged in the reaction kettle in a sliding manner; the stirring piece is used for uniformly stirring the stock solution to be reacted in each reaction area and is fixed on the power piece; the one-way valve piece is fixed on the isolation plate and the piston piece; by controlling the vertical movement frequency of the piston plate, the reaction time is optimized, the flowability of the stock solution is improved, and sufficient mixing is ensured; the one-way valve prevents backflow of the stock solution; the continuous reaction process of the stock solution forms a collaborative closed loop, and the links from temperature control, stirring and stock solution conveying to the reaction have a synergistic effect, so that the esterification reaction is efficiently carried out.

Description

Technical Field

[0001] The invention relates to the technical field of reactors, and in particular to a continuous reactor for esterification of n-propyl acetate. Background Art

[0002] In the industrial production of n-propyl acetate, existing esterification continuous reactor technology has exposed numerous shortcomings, severely hindering improvements in production efficiency, product quality, and economic benefits. Traditional reactors suffer from an irrational internal spatial layout and lack a precise zoning mechanism, making it difficult to meet the complex process requirements of the n-propyl acetate esterification reaction. Most reactors are simply divided into a reaction zone and a discharge zone, leading to interference between the esterification reaction, preheating, and material transfer processes. For example, during the esterification reaction, the lack of an independent preheating zone prevents the raw materials from being fully preheated to the optimal reaction temperature, resulting in slow reaction start-up. Furthermore, the heat generated during the reaction is difficult to distribute rationally, making it impossible to effectively shift the esterification reaction equilibrium toward the formation of n-propyl acetate, thereby limiting the yield of n-propyl acetate. Furthermore, due to the lack of effective means to inhibit side reactions, side reactions such as n-propanol dehydration frequently occur, further reducing product purity and yield. It is difficult to achieve precise zoned temperature control in existing reactors. The esterification reaction of n-propyl acetate is an endothermic process, which requires extremely high precision in temperature control. However, conventional reactors mostly use an overall temperature control method, which cannot be flexibly adjusted to the temperature requirements of different stages and different areas of the reaction. In the early stages of the reaction, the raw materials need to be preheated at a lower temperature, and the overall heating of traditional reactors can easily lead to local overheating, triggering side reactions; when the esterification reaction is in progress, it is impossible to provide sufficient heat in time to maintain the continuous and efficient progress of the reaction. In addition, when it is necessary to suppress side reactions such as the dehydration of n-propyl alcohol, the lack of a gradient temperature control function makes it difficult to accurately adjust the temperature in the reactor, and it is impossible to reduce the occurrence of side reactions from the root, affecting product quality. Summary of the Invention

[0003] The present invention provides a continuous reactor for the esterification of n-propyl acetate. The present invention ensures that the temperature field in each zone is stable and controllable by moving a piston plate, and prevents backflow of raw liquid by using a one-way valve, so that the zoned temperature control and the continuous reaction process form a coordinated closed loop, thereby ensuring the efficient progress of the esterification reaction. When the piston plate moves upward, the folding rod group automatically folds and contracts, driving the stirring assembly to slide axially along the power shaft tube, reserving space for the piston movement, and preventing motion interference through adaptive adjustment of the mechanical structure, thereby ensuring the operational stability of the equipment from the dual dimensions of transmission logic and spatial layout.

[0004] In order to solve the above technical problems, the technical solutions of the present invention are as follows: In a first aspect, a continuous reactor for esterification of n-propyl acetate comprises: a frame and a reactor arranged on the frame, and further comprises: Isolation plates are used to separate the reactor into multiple reaction zones, and three isolation plates are provided. The three isolation plates are fixed in the reactor; a power member is fixed above the reactor; a piston member is used to push the raw liquid to be reacted in each reaction zone into the upper reaction zone, and is slidably provided in the reactor; a stirring member is used to uniformly stir the raw liquid to be reacted in the reaction zone, and is fixed to the power member; a one-way valve member is fixed to the isolation plates and the piston member; There are four piston plates, which slide vertically in the reactor; a piston rubber ring fixed to the piston plate; a piston linkage rod fixed to the piston plate; a sliding groove provided at the bottom of the piston plate; a sliding seat slidingly arranged in the sliding groove; a lifting rod, one end of which is rotatably arranged below the sliding seat and the other end of which is rotatably arranged at the bottom of the reactor; a threaded rod, both ends of which are rotatably arranged in the sliding groove and threadedly inserted into the sliding seat; Solid stirring blades are fixed on the power piece; hollow stirring blades are fixed on the power piece; The first one-way hole is provided on the isolation plate; the second one-way hole is provided on the piston plate; The air diffuser is fixed on the reactor; the water outlet pipe is fixed on the reactor; the purification pipe is fixed on the reactor and is located above the water outlet pipe; Heating plate, fixed on the piston plate.

[0005] Furthermore, the power member includes: The power motor is fixed on the reactor; the power main gear is rotatably set on the reactor and is fixedly connected to the rotating shaft of the power motor; the power shaft tube is rotatably set on the reactor and is rotatably set on the isolation plate and the piston plate; the power auxiliary gear is fixed on the power shaft tube and meshes with the power main gear; the limit frame is fixed in the power shaft tube; the transmission shaft is slidably inserted in the power shaft tube and the limit frame; the displacement shaft is rotatably set on the piston plate and is fixedly connected to the transmission shaft.

[0006] Furthermore, the piston member further comprises: The transmission frame is fixed under the piston plate; the first one-way gear column is fixed under the displacement shaft; the movable cylinder is rotatably set on the transmission frame; the second one-way gear column is slidably inserted in the movable cylinder and is connected to the first one-way gear column; one end of the movable spring is fixed in the movable cylinder, and the other end is fixed on the non-tooth end of the second one-way gear column.

[0007] Furthermore, the piston member further comprises: The first transmission rod is rotatably arranged on the transmission frame; the first bevel gear pair, the input end bevel gear is fixed on the movable cylinder, and the output end bevel gear is fixed on the first transmission rod; the second transmission rod is rotatably arranged on the transmission frame; the second bevel gear pair, the input end bevel gear is fixed on the first transmission rod, and the output end bevel gear is fixed on the second transmission rod; the third bevel gear pair, the input end bevel gear is fixed on the second transmission rod, and the output end bevel gear is fixed on the threaded rod.

[0008] Furthermore, the stirring member further comprises: The fixed ring is fixed on the power shaft tube; the solid slip ring is slidably sleeved on the power shaft tube and is fixedly connected to the solid stirring blade; the liquid box ring is fixed below the power shaft tube; the liquid slip cylinder is slidably sleeved on the transmission shaft and is fixedly connected to the hollow stirring blade.

[0009] Furthermore, the stirring member further comprises: The first folding rod is rotatably arranged on the fixed ring and the liquid box ring at the top; the second folding rod has one end rotatably arranged below the first folding rod and the other end rotatably arranged on the solid slip ring and the liquid slide cylinder; the soft liquid tube has one end fixed on the liquid box ring and the other end fixed on the liquid slide cylinder.

[0010] Furthermore, the stirring member further comprises: A limiting ring is fixed in the hollow stirring blade; a plurality of offset plugs are provided, and the plurality of offset plugs are slidably arranged in the hollow stirring blade; a connecting rod is fixed on the offset plug; a spring seat is slidably arranged on the connecting rod; a dislocation spring, one end of which is fixed in the hollow stirring blade and the other end is fixed on the spring seat; a dislocation channel is opened in the hollow stirring blade; and a liquid spray head is fixed on the hollow stirring blade.

[0011] Furthermore, the one-way valve element further includes: The first annular seat is fixed in the first one-way hole; the first sealing ring is fixed in the first one-way hole; the first valve ball is located in the first one-way hole; the first one-way spring has one end fixed on the first annular seat and the other end fixed on the first valve ball.

[0012] Furthermore, the one-way valve element further includes: The second annular seat is fixed in the second one-way hole; the second sealing ring is fixed in the second one-way hole; the second valve ball is located in the second one-way hole; the second one-way spring has one end fixed on the second annular seat and the other end fixed on the second valve ball.

[0013] Furthermore, it also includes: The raw liquid rack is fixed on the reactor; the raw liquid tube is fixed on the raw liquid rack and connected to the top end of the power shaft tube; the temperature sensor is fixed on the piston plate; the moisture sensor group is fixed in the reactor; the scroll spring box is fixed under the transmission frame, and the working end is fixedly connected to the movable cylinder.

[0014] The above solution of the present invention includes at least the following beneficial effects: The three isolation plates in the reactor divide the space into a lower preheating zone, a middle double reaction zone and an upper separation zone. The zone temperature control is achieved through the built-in heating plate of the piston plate to ensure that the temperature of each zone is suitable for the reaction of the raw liquid, thereby improving the oil phase yield; the power part drives the first one-way gear column, the second one-way gear column, the first bevel gear pair, the second bevel gear pair and the third bevel gear pair in the piston part through the transmission shaft and the displacement shaft, driving the threaded rod to rotate, and pushing the piston plate up through the sliding seat and the lifting rod, and cooperating with the piston rubber ring to squeeze the raw liquid in the zone, so that the raw liquid can be transferred from the lower zone to the upper zone in one direction through the first one-way hole of the isolation plate; by controlling the up and down movement frequency of the piston plate, the reaction time is optimized, the fluidity of the raw liquid is improved and sufficient mixing is ensured; the one-way valve prevents the backflow of the raw liquid; the continuous reaction process of the raw liquid forms a synergistic closed loop, and the synergistic effects of temperature control, stirring, raw liquid transportation and each link of the reaction ensure the efficient esterification reaction.

[0015] The present invention drives the power shaft tube to rotate through the meshing transmission of the power main gear and the power auxiliary gear of the power motor of the power part, and then drives the stirring part to work synchronously: the solid stirring blade realizes the stirring of the whole-area raw liquid, and the hollow stirring blade sprays the raw liquid evenly into the preheating range through the built-in flow channel. The dual structure synergistically enhances the reaction efficiency; the first folding rod and the second folding rod of the stirring part form a linkage mechanism with the solid slip ring and the liquid slip cylinder. When the piston plate moves upward, the folding rod group automatically folds and contracts, driving the stirring assembly to slide axially along the power shaft tube, reserving space for the piston movement, and preventing motion interference through adaptive adjustment of the mechanical structure, thereby ensuring the stability of equipment operation from the dual dimensions of transmission logic and spatial layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A cross-sectional view of a reactor in a continuous reactor for esterification of n-propyl acetate provided in an embodiment of the present invention; Figure 2 A continuous reactor for esterification of n-propyl acetate provided by an embodiment of the present invention Figure 1 A magnified view of point A; Figure 3 A continuous reactor for esterification of n-propyl acetate provided by an embodiment of the present invention Figure 1 Enlarged view of point B; Figure 4 A continuous reactor for esterification of n-propyl acetate provided by an embodiment of the present invention Figure 1 Enlarged view of point C; Figure 5 A continuous reactor for esterification of n-propyl acetate provided by an embodiment of the present invention Figure 1 Enlarged view of point D; Figure 6 A continuous reactor for esterification of n-propyl acetate provided by an embodiment of the present invention Figure 1 Enlarged view of point E; Figure 7 A continuous reactor for esterification of n-propyl acetate provided by an embodiment of the present invention Figure 1 Enlarged view of point F; Figure 8 A schematic diagram of the overall structure of a continuous reactor for n-propyl acetate esterification provided in an embodiment of the present invention; Figure 9 A schematic structural diagram of a threaded rod of a continuous reactor for n-propyl acetate esterification provided by an embodiment of the present invention; Figure 10 A continuous reactor for esterification of n-propyl acetate provided by an embodiment of the present invention Figure 9 Enlarged view of point G; Figure 11 A schematic structural diagram of a power shaft tube of a continuous reactor for n-propyl acetate esterification provided by an embodiment of the present invention; Figure 12 A schematic structural diagram of a limiting frame for a continuous reactor for n-propyl acetate esterification provided by an embodiment of the present invention; Figure 13 A schematic structural diagram of a fixed ring of a continuous reactor for esterification of n-propyl acetate provided in an embodiment of the present invention.

[0017] Description of reference numerals: In the figure: 1, reactor; 2, isolation plate; 3, power parts; 301, power motor; 302, power main gear; 303, power shaft tube; 304, power auxiliary gear; 305, limit frame; 306, transmission shaft; 307, displacement shaft; 4, piston; 401, piston plate; 402, piston rubber ring; 403, piston linkage rod; 404, sliding groove; 405, sliding seat; 406, lifting rod; 407, screw 408, transmission frame; 409, first one-way gear column; 4010, movable cylinder; 4011, second one-way gear column; 4012, movable spring; 4013, first transmission rod; 4014, first bevel gear pair; 4015, second transmission rod; 4016, second bevel gear pair; 4017, third bevel gear pair; 5, stirring element; 501, solid stirring blade; 502, hollow stirring blade; 503, fixed ring; 5 04, solid slip ring; 505, liquid box ring; 506, liquid slide cylinder; 507, first folding rod; 508, second folding rod; 509, soft liquid tube; 5010, limit ring; 5011, misalignment plug; 5012, connecting rod; 5013, spring seat; 5014, misalignment spring; 5015, misalignment channel; 5016, liquid spray head; 6, one-way valve; 601, first one-way hole; 602, second one-way hole; 60 3. First annular seat; 604. First sealing ring; 605. First valve ball; 606. First one-way spring; 607. Second annular seat; 608. Second sealing ring; 609. Second valve ball; 6010. Second one-way spring; 7. Air diffuser; 8. Water outlet pipe; 9. Purification pipe; 10. Heating plate; 11. Raw liquid rack; 12. Raw liquid pipe; 13. Temperature sensor; 14. Moisture sensor assembly; 15. Spiral spring box. DETAILED DESCRIPTION

[0018] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0019] like Figures 1 to 13 As shown, an embodiment of the present invention provides a continuous reactor for the esterification of n-propyl acetate, comprising: a frame and a reactor 1 arranged on the frame, and further comprising: an isolation plate 2 for dividing the reactor 1 into multiple reaction areas, three of which are provided, and the three isolation plates 2 are fixed in the reactor 1; a power member 3 fixed above the reactor 1; a piston member 4 for pushing the raw liquid to be reacted in each reaction area into the upper-level reaction area, and slidingly arranged in the reactor 1; a stirring member 5 for uniformly stirring the raw liquid to be reacted in the reaction area, and fixed on the power member 3; a one-way valve member 6 fixed to the isolation plate 2 and the piston member 4.

[0020] There are four piston plates 401, which slide vertically in the reactor 1; the piston rubber ring 402 is fixed on the piston plate 401; the piston linkage rod 403 is fixed on the piston plate 401; the sliding groove 404 is provided at the bottom of the piston plate 401; the sliding seat 405 is slidingly arranged in the sliding groove 404; the lifting rod 406 has one end rotatably arranged below the sliding seat 405 and the other end rotatably arranged at the bottom of the reactor 1; the threaded rod 407 is rotatably arranged at both ends. The sliding groove 404 is screwed into the sliding seat 405; the solid stirring blade 501 is fixed on the power part 3; the hollow stirring blade 502 is fixed on the power part 3; the first one-way hole 601 is opened on the isolation plate 2; the second one-way hole 602 is opened on the piston plate 401; the air diffusion pipe 7 is fixed on the reactor 1; the water outlet pipe 8 is fixed on the reactor 1; the purification pipe 9 is fixed on the reactor 1 and is located above the water outlet pipe 8; the heating plate 10 is fixed on the piston plate 401.

[0021] It also includes: a raw liquid rack 11, fixed on the reactor 1; a raw liquid tube 12, fixed on the raw liquid rack 11 and connected to the top of the power shaft tube 303; a temperature sensor 13, fixed on the piston plate 401; a moisture sensor group 14, fixed in the reactor 1; a scroll spring box 15, fixed below the transmission frame 408, and the working end is fixedly connected to the movable cylinder 4010.

[0022] Specifically, a sealing treatment is adopted between the piston linkage rod 403 and the isolation plate 2 and the piston plate 401, and the moisture sensor group 14 is used to detect the moisture content to determine the position of the water phase or the oil phase; the movement of the piston plate 401 ensures that the temperature field in each interval is stable and controllable, and a one-way valve is used to prevent the backflow of the raw liquid, so that the zoned temperature control and the continuous reaction process form a synergistic closed loop to ensure the efficient progress of the esterification reaction.

[0023] In another preferred embodiment of the present invention, the power part 3 includes: a power motor 301, fixed on the reactor 1; a power main gear 302, rotatably set on the reactor 1, and fixedly connected to the rotating shaft of the power motor 301; a power shaft tube 303, rotatably set on the reactor 1, and rotatably set on the isolation plate 2 and the piston plate 401; a power auxiliary gear 304, fixed on the power shaft tube 303, and meshed with the power main gear 302; a limiting frame 305, fixed in the power shaft tube 303; a transmission shaft 306, slidably inserted in the power shaft tube 303 and the limiting frame 305; a displacement shaft 307, rotatably set on the piston plate 401, and fixedly connected to the transmission shaft 306.

[0024] The piston member 4 also includes: a transmission frame 408, fixed below the piston plate 401; a first one-way gear column 409, fixed below the displacement shaft 307; a movable cylinder 4010, rotatably mounted on the transmission frame 408; a second one-way gear column 4011, slidably inserted into the movable cylinder 4010 and connected to the first one-way gear column 409; and a movable spring 4012, one end of which is fixed within the movable cylinder 4010 and the other end is fixed to the non-toothed end of the second one-way gear column 4011.

[0025] The piston member 4 also includes: a first transmission rod 4013, which is rotatably arranged on the transmission frame 408; a first bevel gear pair 4014, wherein the input end bevel gear is fixed to the movable cylinder 4010, and the output end bevel gear is fixed to the first transmission rod 4013; a second transmission rod 4015, which is rotatably arranged on the transmission frame 408; a second bevel gear pair 4016, wherein the input end bevel gear is fixed to the first transmission rod 4013, and the output end bevel gear is fixed to the second transmission rod 4015; and a third bevel gear pair 4017, wherein the input end bevel gear is fixed to the second transmission rod 4015, and the output end bevel gear is fixed to the threaded rod 407.

[0026] In another preferred embodiment of the present invention, the stirring member 5 also includes: a fixed ring 503, fixed on the power shaft tube 303; a solid slip ring 504, slidably sleeved on the power shaft tube 303, and fixedly connected to the solid stirring blade 501; a liquid box ring 505, fixed below the power shaft tube 303; a liquid slip cylinder 506, slidably sleeved on the transmission shaft 306, and fixedly connected to the hollow stirring blade 502.

[0027] The stirring member 5 also includes: a first folding rod 507, which is rotatably arranged on the upper side of the fixed ring 503 and the liquid box ring 505; a second folding rod 508, one end of which is rotatably arranged below the first folding rod 507, and the other end of which is rotatably arranged on the solid slip ring 504 and the liquid slide cylinder 506; a soft liquid tube 509, one end of which is fixed on the liquid box ring 505, and the other end is fixed on the liquid slide cylinder 506.

[0028] The stirring element 5 also includes: a limiting ring 5010, fixed in the hollow stirring blade 502; a plurality of offset plugs 5011, which are slidably arranged in the hollow stirring blade 502; a connecting rod 5012, fixed on the offset plug 5011; a spring seat 5013, slidably arranged on the connecting rod 5012; an offset spring 5014, one end of which is fixed in the hollow stirring blade 502 and the other end is fixed on the spring seat 5013; an offset channel 5015, which is opened in the hollow stirring blade 502; and a liquid spray head 5016, which is fixed on the hollow stirring blade 502.

[0029] Specifically, the first folding rod 507 and the second folding rod 508 are arranged to form an angle toward the outside, so as to facilitate the folding of the first folding rod 507 and the second folding rod 508.

[0030] In another preferred embodiment of the present invention, the one-way valve component 6 also includes: a first annular seat 603, fixed in the first one-way hole 601; a first sealing ring 604, fixed in the first one-way hole 601; a first valve ball 605, located in the first one-way hole 601; a first one-way spring 606, one end of which is fixed on the first annular seat 603, and the other end is fixed on the first valve ball 605; the one-way valve component 6 also includes: a second annular seat 607, fixed in the second one-way hole 602; a second sealing ring 608, fixed in the second one-way hole 602; a second valve ball 609, located in the second one-way hole 602; a second one-way spring 6010, one end of which is fixed on the second annular seat 607, and the other end is fixed on the second valve ball 609.

[0031] Working principle: the raw liquid pipe 12 is used to connect to the external liquid supply pipe. The raw liquid is a mixture of n-propyl acetate ester liquid and catalyst; the gas diffusion pipe 7 is used to discharge steam; the water outlet pipe 8 is used to discharge the water phase after the raw liquid is separated; the purification pipe 9 is used for the oil phase.

[0032] Start the power motor 301. The rotation of the power motor 301 drives the rotation of the power main gear 302. The power main gear 302 is engaged with the power auxiliary gear 304. The rotation of the power main gear 302 drives the rotation of the power auxiliary gear 304. The rotation of the power auxiliary gear 304 drives the rotation of the power shaft tube 303. The rotation of the power shaft tube 303 drives the rotation of the transmission shaft 306. The rotation of the transmission shaft 306 drives the rotation of the displacement shaft 307. The transmission shaft 306 can be extended and retracted in the power shaft tube 303.

[0033] The rotation of the power shaft tube 303 drives the rotation of the fixed ring 503 and the liquid box ring 505. The rotation of the fixed ring 503 and the liquid box ring 505 drives the rotation of the first folding rod 507 and the second folding rod 508. The rotation of the second folding rod 508 drives the rotation of the solid slip ring 504 and the liquid slide cylinder 506. The rotation of the solid slip ring 504 and the liquid slide cylinder 506 drives the rotation of the solid stirring blade 501 and the hollow stirring blade 502. The solid stirring blade 501 and the hollow stirring blade 502 rotate in the reactor 1 to stir the raw liquid.

[0034] When the hollow stirring blade 502 rotates, the raw liquid in the raw liquid tube 12 enters the power shaft tube 303, then enters the liquid box ring 505 from the power shaft tube 303, and then enters the liquid slide cylinder 506 from the liquid box ring 505 through the soft liquid tube 509, and then enters the hollow stirring blade 502 from the liquid slide cylinder 506. The raw liquid in the hollow stirring blade 502 pushes open the dislocation plug 5011, the connecting rod 5012 and the spring seat 5013 to squeeze the dislocation spring 5014, and the raw liquid enters between the two dislocation plugs 5011 through the dislocation channel 5015, and the raw liquid is then sprayed out from the liquid spray head 5016, and the sprayed raw liquid is relatively uniform.

[0035] The three isolation plates 2 divide the distribution space of the reactor 1 into four sections; the section below the reactor 1 is the preheating section, the two sections in the middle of the reactor 1 are the reaction sections, and the section above the reactor 1 is the separation section; each section is then heated by the heating plate 10 to meet the temperature requirements of the preheating section, the reaction section, and the separation section. The raw liquid passes through the preheating section, the reaction section, and the separation section in turn. When passing through the first one-way hole 601 and the second one-way hole 602 in each section, it not only enters the next-level section, but also disturbs the raw liquid through the structure of the hole to promote the uniformity of the reaction until it enters the separation section, thereby realizing effective separation of the water phase and the oil phase.

[0036] When stirring the raw liquid, the forward rotation of the power motor 301 and the rotation of the displacement shaft 307 drive the rotation of the first one-way gear column 409. The rotation of the first one-way gear column 409 and the second one-way gear column 4011 are staggered with each other. The second one-way gear column 4011 repeatedly extends into the movable cylinder 4010 through the movable spring 4012. The rotation of the first one-way gear column 409 does not drive the rotation of the movable cylinder 4010. When the piston plate 401 is raised, the reverse rotation of the power motor 301 drives the rotation of the first one-way gear column 409 and the second one-way gear column 4011. When the piston plate 401 is lowered, the spiral spring box 15 assists the piston plate 401 in resetting.

[0037] The rotation of the power shaft tube 303, the transmission shaft 306, the displacement shaft 307 and the first one-way gear column 409 drives the rotation of the second one-way gear column 4011, the rotation of the second one-way gear column 4011 drives the rotation of the movable cylinder 4010, the rotation of the movable cylinder 4010 drives the rotation of the first bevel gear pair 4014, the rotation of the first bevel gear pair 4014 drives the rotation of the first transmission rod 4013, the rotation of the first transmission rod 4013 drives the rotation of the second bevel gear pair 4016, the rotation of the second bevel gear pair 4016 drives the rotation of the second transmission rod 4015, and the rotation of the second transmission rod 4015 drives the rotation of the third bevel gear pair The rotation of the wheel pair 4017 and the rotation of the third bevel gear pair 4017 drive the rotation of the threaded rod 407, and the rotation of the threaded rod 407 drives the sliding seat 405 to slide in the sliding groove 404. The sliding seat 405 approaches the displacement shaft 307, and the lifting rod 406 drives the piston plate 401 to move upward. The piston plate 401 and the piston rubber ring 402 move upward to squeeze the raw liquid in the interval, and the raw liquid is transferred from the lower interval to the upper interval; when the piston plate 401 descends, the torque is released by its own weight and the scroll spring box 15, driving the piston plate 401 to reset, and the first one-way gear column 409 and the second one-way gear column 4011 can be staggered with each other.

[0038] When the piston plate 401 rises, the gap between the piston plate 401 and the isolation plate 2 in the same interval gradually increases; the piston plate 401 squeezes the raw liquid in the interval, and the raw liquid enters between the piston plate 401 and the isolation plate 2 in the upper interval through the first valve ball 605 in the first one-way hole 601, and the raw liquid enters the upper interval from the lower interval. The rising of the piston plate 401 pushes the oil phase to be discharged from the purification tube 9; when the piston plate 401 descends, the raw liquid in the piston plate 401 and the isolation plate 2 is discharged to the top of the piston plate 401 by pushing the second valve ball 609 in the second one-way hole 602, and the piston plate 401 is located at the bottom of the interval. At this time, the raw liquid completely enters the upper interval.

[0039] When the piston plate 401 moves upward, it pushes the solid slip ring 504 to move along the power shaft tube 303, the liquid slip cylinder 506 and the transmission shaft 306 move into the power shaft tube 303, and the first folding rod 507 and the second folding rod 508 fold together to leave space for the piston plate 401 to rise.

[0040] The water phase and the oil phase in the separation interval are separated after standing, and the separated water phase is detected by the moisture sensor group 14, and the water phase is discharged from the water outlet pipe 8; the moisture sensor group 14 detects the oil phase, and when the piston plate 401 rises, it pushes the oil phase in the separation interval to be discharged from the purification pipe 9, and the water outlet pipe 8 remains closed; the water outlet pipe 8 is located at the bottom of the separation interval for discharging the water phase, and the purification pipe 9 is located at the top of the separation interval for discharging the oil phase.

[0041] The three isolation plates 2 provided in the reactor 1 divide it into four zones, including a preheating zone at the bottom, two reaction zones in the middle, and a separation zone at the top. Together with the heating plate 10 on the piston plate 401, the temperature of each zone can be precisely controlled (preheating zone 60-80°C, reaction zone 100-130°C, separation zone 80-100°C). This not only satisfies the endothermic requirements of the esterification reaction and pushes the equilibrium toward ester formation, but also reduces side reactions (such as dehydration of n-propanol) through zoned temperature control, thereby increasing the yield of the oil phase. The power motor 3 in the power unit 3 is 01 drives the power shaft tube 303 to rotate through the meshing transmission of the power main gear 302 and the power auxiliary gear 304, thereby driving the stirring member 5 to work, wherein the solid stirring blade 501 is used for stirring, and the hollow stirring blade 502 is used for stirring and can evenly mix the raw liquid and the catalyst to enhance the reaction efficiency; the power member 3 is connected to the first one-way tooth column 409, the second one-way tooth column 4011, the movable cylinder 4010, the first bevel gear pair 4014, the second bevel gear pair 4016 and the third bevel gear pair 4 in the transmission shaft 306, the displacement shaft 307 and the piston member 4 The transmission design of 017 drives the threaded rod 407 to rotate, and drives the piston plate 401 upward through the sliding seat 405 and the lifting rod 406, and cooperates with the piston rubber ring 402 to squeeze the raw liquid in the interval, so that the raw liquid can be transferred from the lower interval to the upper interval through the first one-way hole 601 on the isolation plate 2, ensuring the continuity of the reaction process and avoiding the backflow of the raw liquid; the first folding rod 507 and the second folding rod 508 in the stirring element 5, the solid slip ring 504 and the liquid slide cylinder 506 can automatically fold and contract when the piston plate 401 rises, reserving space for the piston movement. , preventing mechanical interference and ensuring the stability of equipment operation; the raw liquid rack 11 and the raw liquid pipe 12 realize the continuous supply of raw liquid and catalyst, the diffuser pipe 7, the water outlet pipe 8 and the purification pipe 9 are used for steam discharge, water phase separation and oil phase purification respectively, the temperature sensor 13 and the moisture sensor group 14 can monitor the reaction status in real time, and the scroll spring box 15 assists the piston plate 401 in resetting. Through modular design and precise coordination of various components, efficient, continuous and controllable production of the esterification reaction of n-propyl acetate is realized, which significantly improves the product purity and energy utilization efficiency in industrial production.

[0042] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A continuous reactor for esterification of n-propyl acetate, comprising: The frame and the reactor arranged on the frame are characterized by further comprising: Isolation plates are used to separate the reactor into multiple reaction zones, and three isolation plates are provided. The three isolation plates are fixed in the reactor; a power member is fixed above the reactor; a piston member is used to push the raw liquid to be reacted in each reaction zone into the upper reaction zone, and is slidably provided in the reactor; a stirring member is used to uniformly stir the raw liquid to be reacted in the reaction zone, and is fixed to the power member; a one-way valve member is fixed to the isolation plates and the piston member; There are four piston plates, which slide vertically in the reactor; a piston rubber ring fixed to the piston plate; a piston linkage rod fixed to the piston plate; a sliding groove provided at the bottom of the piston plate; a sliding seat slidingly arranged in the sliding groove; a lifting rod, one end of which is rotatably arranged below the sliding seat and the other end of which is rotatably arranged at the bottom of the reactor; a threaded rod, both ends of which are rotatably arranged in the sliding groove and threadedly inserted into the sliding seat; Solid stirring blades are fixed on the power piece; hollow stirring blades are fixed on the power piece; The first one-way hole is provided on the isolation plate; the second one-way hole is provided on the piston plate; The air diffuser is fixed on the reactor; the water outlet pipe is fixed on the reactor; the purification pipe is fixed on the reactor and is located above the water outlet pipe; Heating plate, fixed on the piston plate.

2. A continuous reactor for esterification of n-propyl acetate according to claim 1, characterized in that: The power member includes: The power motor is fixed on the reactor; the power main gear is rotatably set on the reactor and is fixedly connected to the rotating shaft of the power motor; the power shaft tube is rotatably set on the reactor and is rotatably set on the isolation plate and the piston plate; the power auxiliary gear is fixed on the power shaft tube and meshes with the power main gear; the limit frame is fixed in the power shaft tube; the transmission shaft is slidably inserted in the power shaft tube and the limit frame; the displacement shaft is rotatably set on the piston plate and is fixedly connected to the transmission shaft.

3. A continuous reactor for esterification of n-propyl acetate according to claim 2, characterized in that: The piston member further comprises: The transmission frame is fixed under the piston plate; the first one-way gear column is fixed under the displacement shaft; the movable cylinder is rotatably set on the transmission frame; the second one-way gear column is slidably inserted in the movable cylinder and is connected to the first one-way gear column; one end of the movable spring is fixed in the movable cylinder, and the other end is fixed on the non-tooth end of the second one-way gear column.

4. A continuous reactor for esterification of n-propyl acetate according to claim 3, characterized in that: The piston member further comprises: The first transmission rod is rotatably arranged on the transmission frame; the first bevel gear pair, the input end bevel gear is fixed on the movable cylinder, and the output end bevel gear is fixed on the first transmission rod; the second transmission rod is rotatably arranged on the transmission frame; the second bevel gear pair, the input end bevel gear is fixed on the first transmission rod, and the output end bevel gear is fixed on the second transmission rod; the third bevel gear pair, the input end bevel gear is fixed on the second transmission rod, and the output end bevel gear is fixed on the threaded rod.

5. The continuous reactor for esterification of n-propyl acetate according to claim 1, characterized in that: The stirring member further comprises: The fixed ring is fixed on the power shaft tube; the solid slip ring is slidably sleeved on the power shaft tube and is fixedly connected to the solid stirring blade; the liquid box ring is fixed below the power shaft tube; the liquid slip cylinder is slidably sleeved on the transmission shaft and is fixedly connected to the hollow stirring blade.

6. A continuous reactor for esterification of n-propyl acetate according to claim 5, characterized in that: The stirring member further comprises: The first folding rod is rotatably arranged on the fixed ring and the liquid box ring at the top; the second folding rod has one end rotatably arranged below the first folding rod and the other end rotatably arranged on the solid slip ring and the liquid slide cylinder; the soft liquid tube has one end fixed on the liquid box ring and the other end fixed on the liquid slide cylinder.

7. A continuous reactor for esterification of n-propyl acetate according to claim 6, characterized in that: The stirring member further comprises: A limiting ring is fixed in the hollow stirring blade; a plurality of offset plugs are provided, and the plurality of offset plugs are slidably arranged in the hollow stirring blade; a connecting rod is fixed on the offset plug; a spring seat is slidably arranged on the connecting rod; a dislocation spring, one end of which is fixed in the hollow stirring blade and the other end is fixed on the spring seat; a dislocation channel is opened in the hollow stirring blade; and a liquid spray head is fixed on the hollow stirring blade.

8. The continuous reactor for esterification of n-propyl acetate according to claim 1, characterized in that: The one-way valve member further comprises: The first annular seat is fixed in the first one-way hole; the first sealing ring is fixed in the first one-way hole; the first valve ball is located in the first one-way hole; the first one-way spring has one end fixed on the first annular seat and the other end fixed on the first valve ball.

9. A continuous reactor for esterification of n-propyl acetate according to claim 8, characterized in that: The one-way valve member further comprises: The second annular seat is fixed in the second one-way hole; the second sealing ring is fixed in the second one-way hole; the second valve ball is located in the second one-way hole; the second one-way spring has one end fixed on the second annular seat and the other end fixed on the second valve ball.

10. The continuous reactor for esterification of n-propyl acetate according to claim 1, characterized in that: Also includes: The raw liquid rack is fixed on the reactor; the raw liquid tube is fixed on the raw liquid rack and connected to the top end of the power shaft tube; the temperature sensor is fixed on the piston plate; the moisture sensor group is fixed in the reactor; the scroll spring box is fixed under the transmission frame, and the working end is fixedly connected to the movable cylinder.

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