An online reactor

Abstract

The invention discloses an online reactor, comprising a reactor shell, wherein edge riser trays and central riser trays are alternately arranged inside the reactor shell; and further comprising a fixed-distance screw rod provided with a one-way valve assembly, wherein both the edge riser trays and the central riser trays are connected to the fixed-distance screw rod. The device can effectively improve the problems existing in the traditional reactor, such as uneven material flow distribution and difficulty in discharging materials after shutdown. The alternate arrangement of the edge riser trays and the central riser trays can make the materials present a push flow inside the reactor, thereby enhancing the stirring and mixing effects of the materials and improving the uniformity of the reaction. At the same time, the arrangement of the fixed-distance screw rod can ensure the distance between the trays and provide convenience for the installation and maintenance of the trays and the one-way valve assembly. The arrangement of the one-way valve assembly can realize the directional flow of the materials by controlling the opening and closing thereof, thereby optimizing the flow path of the materials and further improving the uniformity of the flow.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, in particular to an online reactor. Background Art

[0002] DuPont's three-pot process polyester technology has the significant advantages of short process, low equipment investment and energy consumption, and short reaction time. The disadvantage is that the reaction uniformity is poor, especially in the esterification part.

[0003] For three-pot polyester units with relatively high design capacity, due to the limited volume of the esterification reactor, the material residence time is limited, and a higher molar ratio and temperature are mainly used to increase the esterification reaction rate, so the disadvantage of poor reaction uniformity (wide material molecular weight distribution) is particularly prominent. In order to give full play to the potential of polyester units, the actual output of some polyester units exceeds the design capacity, which also leads to poor reaction uniformity (wide material molecular weight distribution).

[0004] In the actual production process, the pre-polycondensation and final polycondensation vacuum systems contain a large amount of unreacted PTA and small molecular oligomers. These substances will be adsorbed on the inner wall of the vacuum system pipes, resulting in a reduction in the pipe diameter, causing a reduction in the output of the polyester unit or even shutting down the polyester unit.

[0005] In order to improve the uniformity of the esterification materials, improve the product quality, and reduce the esterification reaction temperature and energy consumption, an online reactor (oligomer homogenizer) is usually added between the esterification reactor and the precondensation reactor.

[0006] For example, the Chinese patent application number: CN201420485856.8 discloses a "device for homogenizing a flowable substance", which comprises: a container (1); at least one homogenizer (2) connected to the container (1); and a circulation pipe (3), which connects the outlet of the homogenizer (2) to the container (1), and through which the substance can be fed back from the outlet to the region of the container (1) separated from the homogenizer (2). According to the utility model, the circulation pipe (3) leads to the discharge hole (5) of at least one rotatable mixing arm (6) inside the container, wherein the mixing arm (6) causes the mixed substance discharged by impact to be in a rotational motion.

[0007] Although the above scheme utilizes the kinetic energy of the circulating mixed material to evenly distribute the mixed material fed back into the container by means of the rotating mixing arm and simultaneously achieves a stirring effect by means of the mixing arm, there are still many problems.

[0008] According to the prior art and the above-mentioned solutions, it can be known that the existing online reactors are mainly vertical, jacketed tank-type containers without stirring, and there are mainly two types according to the internal structure.

[0009] First, an axial flow guide is provided inside the reactor. The material flows into the reactor from the inlet at the bottom of the reactor. The material undergoes multiple deflections inside the reactor and finally flows out from the outlet at the top of the reactor. This structure is used to prevent short circuits and mixing of materials. Usually, only a tear hole with a diameter of φ8mm is provided to drain the material. The disadvantage is that a large amount of material inside the reactor can only be discharged as waste after shutdown. At the same time, a large amount of ethylene glycol (EG) is required to flush the reactor to ensure that the material inside the reactor is drained. The discharge time is long, which not only causes waste of material and heat energy, but also causes harm to personnel health.

[0010] Second, a layer of orifice plate liquid distributor is set inside the reactor. The material flows into the reactor from the inlet at the bottom of the reactor. After the material flows through the orifice plate liquid distributor, the flow of the material is redistributed, and the material is stirred and mixed at the same time. Finally, the material flows out from the outlet at the top of the reactor. The disadvantage is that a large amount of material inside the reactor can only be discharged as waste after shutdown.

[0011] The above two structures have a common disadvantage that the flow distribution of the materials inside the reactor is uneven, the residence time of the materials is inconsistent, and the effect of improving the uniformity of the esterification materials is not good. Summary of the invention

[0012] In response to the problems in the prior art mentioned in the background technology that the flow distribution of materials inside the reactor is uneven, the residence time of materials is inconsistent, and the effect of improving the uniformity of esterification materials is poor, the present application provides an online reactor that can improve the flow distribution of materials in the reactor, enhance the stirring and mixing effects, and thus improve the overall uniformity of the reaction.

[0013] In order to achieve the above-mentioned purpose, an online reactor is disclosed, comprising a reactor shell, in which edge riser tube trays and central riser tube trays are alternately arranged; and a one-way valve assembly is also provided with a valve stem, and the edge riser tube trays and the central riser tube trays are both connected to a fixed-distance screw.

[0014] This device can effectively improve the problems existing in traditional reactors, such as uneven material flow distribution and difficulty in discharging materials after shutdown. The alternating arrangement of edge riser trays and center riser trays can make the materials flow in a plug flow inside the reactor, thereby enhancing the stirring and mixing effects of the materials and improving the uniformity of the reaction. At the same time, the setting of the fixed-pitch screw can ensure the distance between the trays and facilitate the installation and maintenance of the trays and the one-way valve assembly. The setting of the one-way valve assembly can achieve directional flow of materials by controlling its opening and closing, thereby optimizing the flow path of the materials and further improving the uniformity of the flow.

[0015] Further, the reactor shell includes a cylindrical body, and an upper head and a lower head are respectively provided at both ends of the cylindrical body, and the reactor shell is a vertical jacket structure; the upper head is welded to the cylindrical body through a first jacket flange, a material outlet is provided at the top of the upper head, and the lower head is welded to the cylindrical body through a second jacket flange, and a material inlet is provided at the bottom of the lower head. This vertical structure is conducive to the flow direction of the material and improves the efficiency of the reaction. At the same time, this structural design facilitates the installation and maintenance of the tray and the one-way valve assembly. When maintenance is required, the upper and lower heads can be easily disassembled without removing the entire reactor shell, which greatly improves the maintenance convenience of the equipment. In addition, a material outlet is provided at the top of the upper head, and a material inlet is provided at the bottom of the lower head. The inlet and outlet of the material are respectively arranged at the upper and lower parts of the reactor, which is conducive to forming a good flow path and improving the uniformity of the residence time distribution of the material in the reactor, thereby improving the overall efficiency of the reaction. This reasonable inlet and outlet setting gives full play to the characteristics of the vertical reactor.

[0016] Preferably, the edge riser tray and the center riser tray are both monolithic trays, the edge riser tray and the center riser tray are alternately arranged up and down, and the fixed-distance screw supports the tray and maintains the tray spacing. Both trays are monolithic structures and are alternately arranged up and down. This integral design avoids the problems of complex material flow channels and easy blockage in traditional reactors, and is conducive to the smooth flow of materials. At the same time, through the connection of the fixed-distance screw, not only can the reasonable spacing between the trays be fixed and maintained, but also convenience is provided for subsequent installation and maintenance. The alternating arrangement of the edge riser tray and the center riser tray further optimizes the flow path of the material. The edge riser tray can make the material flow radially, while the center riser tray can redistribute the material. The two cooperate with each other to greatly improve the flow uniformity of the material inside the reactor. This not only helps to improve the overall efficiency of the reaction, but also creates more uniform conditions for subsequent polymerization reactions. In addition to supporting the trays, the fixed-distance screw can also maintain a reasonable spacing between the trays. This not only helps to optimize the flow of materials, but also provides a basis for the installation and adjustment of the one-way valve assembly, thereby ensuring the smooth operation of the entire reaction system. In this solution, the monolithic edge riser tray and center riser tray used in the online reactor not only solve the problems existing in the traditional reactor through reasonable structural design, but also further improve the flow uniformity of the materials.

[0017] Preferably, the edge riser tray comprises a first tray and a first ring tray, wherein the first tray is a circular thin plate, the first tray is offset upwardly and connected to the first ring tray, and a plurality of collars and a plurality of valve seats are evenly arranged on the first tray, and the top of the valve seat is flush with the first tray. A plurality of collars and a plurality of valve seats are evenly arranged on the first tray, wherein the top of the valve seat is flush with the first tray. This arrangement not only contributes to the uniform distribution of materials, but also facilitates the installation and adjustment of the subsequent one-way valve assembly. The first tray is offset upwardly and connected to the first ring tray, leaving space at the bottom of the first tray. The structure of this edge riser tray can achieve complete discharge of materials in the entire reactor during shutdown. This not only avoids the problem of materials becoming waste in traditional reactors, but also helps with subsequent cleaning and maintenance work. The structural design of the edge riser tray fully considers the needs of material flow, and optimizes material flow through reasonable geometric dimensions and valve seat arrangements, while also facilitating equipment maintenance.

[0018] Preferably, the central riser tray comprises a second tray and a second ring tray, a central hole is provided at the center of the second tray, a riser is provided at the central hole, both ends of the riser are equidistant from the second tray, one end is a smooth edge, and the other end is evenly distributed with trapezoidal slits, and a closed liquid distribution hole is provided between the smooth edge end of the riser and the second tray. The central riser tray consists of a second tray and a second ring tray. A central hole is provided at the center of the second tray, and a riser is provided in the central hole. Both ends of the riser are equidistant from the second tray, one end is a smooth edge, and the other end is evenly distributed with trapezoidal slits. This structural design can effectively control the flow of materials and make them present good radial distribution characteristics. A closed liquid distribution hole is provided between the smooth edge end of the riser and the second tray, which can further improve the flow distribution of materials and improve the stirring and mixing effects. This is not only conducive to improving the uniformity of the reaction, but also creates more favorable conditions for subsequent polymerization reactions. The second tower plate is also evenly provided with multiple collars and multiple valve seats, and the sealing surface of the valve seat is on the same side as the smooth edge of the riser. The second ring plate is on the same side as the smooth edge of the riser. This horizontal setting helps to maintain a good flow state of the material inside the tower plate. In addition, the second tower plate is also provided with a pressure plate that is half-surrounded by the second ring plate. The inner side of the pressure plate is provided with a pressure ring to press the packing on the second tower plate, thereby completing the sealing of the second ring plate. This design can not only effectively prevent the material from being lost in the axial direction, but also avoid abnormal mixing, which is conducive to improving the quality of the product. The structural design of the central riser tower plate highlights the fine control of the material flow. The overall performance of the reactor is further improved through the reasonable setting of the liquid distribution holes, the optimization of the layout of the valve seat and the ring plate, and the application of the packing sealing device.

[0019] Further, the second tower plate is evenly provided with a plurality of collars and a plurality of valve seats, the sealing surface of the valve seat is on the same side as the light edge end of the riser, and the second ring plate is on the same side as the light edge end of the riser; the second tower plate is provided with a pressure plate that is half-surrounded by the second ring plate, and the pressure plate is provided with a pressure ring on the inner side of the second tower plate, and the pressure ring presses the packing on the second tower plate to complete the sealing of the second ring plate. The second tower plate is also evenly provided with a plurality of collars and a plurality of valve seats, which is consistent with the design of the edge riser tray. The sealing surface of these valve seats is on the same side as the light edge end of the riser, and this layout is conducive to optimizing the flow path of the material. The second ring plate is also on the same side as the light edge end of the riser. This horizontal arrangement helps to maintain a good flow state of the material inside the tower plate and avoid abnormal flow state. In addition, the second tower plate is also provided with a pressure plate that is half-surrounded by the second ring plate, and a pressure ring is provided on the inner side of the pressure plate. The pressure ring presses the packing on the second tower plate, thereby completing the sealing of the second ring plate. This design can not only effectively prevent the material from being lost along the axial direction, but also avoid abnormal mixing, which is conducive to improving the quality of the product. The packing material used is carbon fiber packing, which not only ensures good sealing, but also has excellent corrosion resistance and high temperature resistance. This is crucial for the long-term stable operation of the reactor. The central riser tray reflects the refined design in terms of structural layout and filler selection, which not only helps to optimize the flow of materials, but also provides a strong guarantee for ensuring the reliability of the equipment.

[0020] Preferably, the fixed-distance screw is a hexagonal steel rod with an external thread at one end and an internal thread at the other end, and the specifications of the external thread and the internal thread are the same. The external thread end of the fixed-distance screw passes through the collar and is connected to the internal thread of another fixed-distance screw by threading. By using the cooperation of the external thread and the internal thread, multiple fixed-distance screws can be connected to form an integral support structure by threading. The specifications of the external thread and the internal thread are the same, which not only simplifies the complexity of manufacturing and installation, but also improves the connection stability between the fixed-distance screws. Specifically, the external thread end of the fixed-distance screw passes through the collar on the edge riser tray or the center riser tray, and is threadedly connected to the internal thread of another fixed-distance screw, thereby achieving support and fixation of the tray. Not only does it ensure the stable arrangement of each tray inside the reactor, but it also provides convenience for the subsequent installation and adjustment of the one-way valve assembly. At the same time, the integral connection of the fixed-distance screw also makes disassembly and maintenance more convenient and quick.

[0021] Preferably, each layer of edge riser tray / center riser tray is provided with several groups of one-way valve assemblies, and the one-way valve assemblies of different layers of trays are connected into one body through the valve stem thread, and the valve stem of the one-way valve assembly extends out of the reactor upper head, and the extended valve stem is provided with a packing seal. Each layer of edge riser tray and center riser tray is provided with several groups of one-way valve assemblies. Multiple groups of arrangements not only help to achieve directional flow of materials inside the reactor, but also improve the overall flow uniformity. The one-way valve assemblies on different layers of trays are connected into one body through the valve stem thread. This structural design greatly simplifies the complexity of installation and maintenance, and also ensures the coordinated work of the one-way valve assemblies of each layer. The valve stems of the one-way valve assemblies all extend out of the reactor upper head, and the extended part is provided with a packing seal, which not only ensures the sealing of the one-way valve, but also facilitates the adjustment of the valve assembly during subsequent maintenance. The use of the one-way valve assembly also has another advantage, that is, it can achieve complete discharge of materials in the entire reactor during shutdown. This not only avoids the problem of materials becoming waste, but also facilitates the cleaning and maintenance of the equipment. The one-way valve assembly design adopted by the reactor effectively controls the flow path of the material and improves the overall flow uniformity through measures such as multi-group arrangement, integrated structure and packing seal.

[0022] Preferably, the one-way valve assembly includes the valve seat, valve stem, spring, valve core and screw, one end of the valve stem is provided with external thread and the other end is provided with internal thread, the valve core is a truncated cone with multiple steps, the valve core is provided with a center hole, the center hole is transitionally matched with the valve stem, the valve core is provided with a stroke hole on the side close to the spring, and the valve core is fixed to the valve stem by screws. The specific structure of the one-way valve assembly includes a valve seat, a valve stem, a spring, a valve core and a screw. Among them, one end of the valve stem is provided with an external thread and the other end is provided with an internal thread. This design can conveniently connect multiple valve stems into one by threading, further simplifying the complexity of installation and maintenance. The valve core adopts a truncated cone structure with multiple steps, and the center hole is transitionally matched with the valve stem, which helps to accurately control the opening and closing stroke of the valve core and ensure that the one-way valve can be reliably opened and closed during operation. At the same time, the valve core is provided with a stroke hole on the side close to the spring, which can better limit the range of motion of the valve core and avoid damage caused by excessive stroke. In addition, the valve core is fixed to the valve stem by hexagon socket screws. This reliable connection ensures the integrity of the valve core and the valve stem, avoiding leakage caused by relative movement during the reaction process. The structural design of the one-way valve assembly fully considers the reliability requirements during use, and effectively controls the valve's travel and sealing performance through reasonable mechanical structure optimization.

[0023] Preferably, the external threaded end of the valve stem passes through the valve seat and is threadedly connected to the internal thread of another valve stem to form an integral body. The valve stem of the one-way valve assembly extends outward from the upper end cap. The extended portion of the valve stem is provided with a stuffing box. The valve stem is externally connected to an axially movable cylinder, and the axial movement of the axially movable cylinder controls the opening and closing of the one-way valve assembly. The external threaded end of the valve stem of the one-way valve assembly passes through the valve seat on the tower plate and is threadedly connected to the internal thread of another valve stem to form an integral body. This structural design not only simplifies the installation process, but also enhances the stability of the entire valve assembly.

[0024] In addition, the terminal valve stem of the one-way valve assembly extends out of the upper end of the reactor, and a stuffing box is installed on the extended part. This setting not only ensures the sealing of the valve, but also provides convenience for subsequent adjustment and maintenance.

[0025] It is worth mentioning that these terminal valve stems are also connected to axially movable cylinders. Through the axial movement of the cylinder, the opening and closing of the check valve assembly can be precisely controlled. This automated control helps to achieve fine adjustment of material flow, thereby further optimizing the reaction process.

[0026] Therefore, the present invention has the following beneficial effects: The alternating arrangement of edge riser trays and center riser trays can improve the flow distribution of materials in the reactor, enhance the stirring and mixing effects, and thus improve the overall uniformity of the reaction.

[0027] The design of the fixed-pitch screw not only firmly supports each tower plate, but also facilitates the installation and adjustment of the one-way valve assembly, thereby improving the maintainability of the equipment.

[0028] The application of the one-way valve assembly can accurately control the flow path of the material, further optimize the uniformity of the flow, and create more favorable conditions for subsequent polymerization reactions.

[0029] The vertical jacket structure and packing seal design are adopted to achieve complete discharge of materials during shutdown, avoiding problems caused by material residue and greatly improving the maintenance convenience of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the online reactor in Example 1; Figure 2 This is a schematic diagram of the structure of the edge riser tray; Figure 2-1 A perspective view of an edge riser tray; Figure 2-2 is a cross-sectional view of an edge riser tray; Figure 3 This is a schematic diagram of the structure of the center liquid riser tray; Figure 3-1A perspective view of a center riser tray; Figure 3-2 is a cross-sectional view of a center riser tray; Figure 4 for Figure 3-2 A partial enlarged view of point a in the middle; Figure 5 Schematic diagram of the fixed-pitch screw structure; Figure 5-1 This is a schematic diagram of the installation of the fixed-distance screw; Figure 6 Schematic diagram of the one-way valve assembly structure Figure 7 Diagram of valve stem and stuffing box assembly Figure 8 This is a schematic diagram of the structure of the online reactor in Example 2; Fig. 9 It is a schematic diagram of the process flow of the online reactor of the present invention.

[0031] In the figure: 1—Reactor shell 1.1—Upper head, 1.2—Jacket flange, 1.3—Cylindrical body, 1.4—Lower Head 2-Edge Riser Tray 2.1—First Tray 2.2—First Ring Plate 3—Center riser tray 3.1—Second tray 3.2—Liquid Lifting Tube 3.21—Trapezoidal tooth gap 3.22—Light Edge 3.3—Second ring plate 3.4 - Filling 3.5—Pressing ring 3.6—Press plate 3.7—Hexagon socket screw 4—Fixed-pitch screw 4.1 - Ring 4.2—Fixed-pitch screw 5—Check valve assembly 5.1—Valve seat 5.2—Valve stem 5.3 - Spring 5.4—Valve core 5.5—Hexagon socket screw 5.6—Stuffing box 6—Axial reciprocating cylinder 7—Float 8—Three-way valve 8.1—Three-way valve feed end 8.2—Three-way valve discharge end 9—Gear pump 10—First additive injection nozzle 11—Second additive injection nozzle DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0033] Example 1 like Figure 1 As shown, the reactor shell 1 adopts a vertical jacket structure, including: the upper head 1.1, the jacket flange 1.2, the cylindrical body 1.3 and the lower head 1.4, which are connected in sequence from top to bottom to form the reactor shell 1, the upper head 1.1 and the jacket flange 1.2 are welded into one body, the top of the upper head 1.1 is provided with a material outlet, the lower head 1.4 and the cylindrical body 1.3 are welded into one body, the bottom of the lower head 1.4 is provided with a material inlet, the cylindrical body 1.3 and the matching jacket flange 1.2 are welded into one body, and the reactor shell 1 is matched and connected by the matching jacket flange 1.2.

[0034] The edge riser tray 2 and the center riser tray 3 are both monolithic trays, the edge riser tray 2 and the center riser tray 3 are alternately arranged up and down, the upper and lower trays are connected and fixed in the linear reactor shell 1 by the fixed-distance screw 4, and the fixed-distance screw 4 plays the role of supporting the trays (2, 3) and maintaining the distance between the trays (2, 3). The characteristics are: the material flows radially, and the liquid in the trays (2, 3) is evenly distributed.

[0035] like Figure 2 , 2-1As shown in 2-2, the edge riser tray 2 is disc-shaped and includes: the first tray 2.1 and the first ring plate 2.2. The first tray 2.1 is a circular thin plate. The first ring plate 2.2 is arranged on the outer ring of the first tray 2.1 and is perpendicular to the tray. The distances between the two ends of the first ring plate 2.2 and the first tray 2.1 are unequal. The first ring plate 2.2 is installed upwards on the shorter side of the first tray 2.1. A plurality of sleeve rings 4.1 are evenly arranged on the same circumference of the first tray 2.1. In this embodiment, there are 4 sleeve rings. The distances between the two ends of the sleeve ring 4.1 and the first tray 2.1 are unequal. A plurality of valve seats 5.1 are evenly arranged on the same circumference of the first tray 2.1. In this embodiment, there are 4 valve seats. The sealing surface of the valve seat 5.1 is in the same direction as the shorter side of the first ring plate 2.2 that exceeds the shorter side of the first tray 2.1. The top of the valve seat 5.1 is flush with the first tray 2.1. The material in the edge riser tray 2 can be completely discharged.

[0036] like Figure 3 , 3-1 As shown in 3-2, the central liquid riser tray 3 is in the shape of a disk, the liquid riser 3.2 of the central liquid riser tray 3 is provided with a liquid distribution hole, and the packing 3.4 is used to seal the central liquid riser tray 3 and the inner wall of the cylindrical body 1.3. It includes: the second tray 3.1, the liquid riser 3.2, the second ring plate 3.3, the filler 3.4, the pressure ring 3.5, the pressure plate 3.6 and the hexagon socket screw 3.7. The second tower plate 3.1 is a circular thin plate, the center of the second tower plate 3.1 is provided with a center hole, the center hole is provided with the liquid riser 3.2, the two ends of the liquid riser 3.2 are at equal distances from the second tower plate 3.1, one end of the liquid riser 3.2 is a smooth edge, the other end of the liquid riser 3.2 is evenly distributed with open trapezoidal slits, the trapezoidal slit end of the liquid riser 3.2 is installed downward, and a closed liquid distribution hole is provided on the tube wall between the smooth edge end of the liquid riser 3.2 and the second tower plate 3.1. Four collars 4.1 are evenly provided on the same circumference of the second tower plate 3.1, the two ends of the collar 4.1 are at equal distances from the second tower plate 3.1, and four valve seats 5.1 are evenly provided on the same circumference of the second tower plate 3.1, the sealing surface of the valve seat 5.1 is on the same side as the smooth edge end of the liquid riser 3.2, and the top of the valve seat 5.1 is flush with the second tower plate 3.1.

[0037] like Figure 4As shown, the second ring plate 3.3 is welded at about 10 mm on the outer ring of the second tower plate 3.1, and the second ring plate 3.3 is on the same side as the smooth edge end of the riser tube 3.2. The filler 3.4 is installed on the second tower plate 3.1 between the inner wall of the cylindrical body 1.3 and the second ring plate 3.3. The filler 3.4 is a carbon fiber packing, and the pressure ring 3.5 is pressed on the filler 3.4. The pressure ring 3.5 is an open circular ring. One end of the pressure plate 3.6 is pressed on the top of the pressure ring 3.5, and the other end of the pressure plate 3.6 is supported on the second tower plate 3.1. The pressure plate 3.6 is fixed to the second tower plate 3.1 by the hexagon socket screw 3.7, and the pressure plate 3.6 presses the pressure ring 3.5.

[0038] like Figure 5 As shown, the fixed-distance screw 4.2 is a hexagonal steel rod with an external thread at one end and an internal thread at the other end. The external thread and the internal thread have the same specifications. The external thread end of the fixed-distance screw 4.2 passes through the ring 4.1 and is connected to the internal thread of the other fixed-distance screw 4.2 through a thread.

[0039] like Figure 6 As shown, the one-way valve assembly 5 controls the opening and closing of the one-way valve assembly 5 through the axial movement of the valve stem 5.2, and includes the valve seat 5.1, the valve stem 5.2, the spring 5.3, the valve core 5.4, the hexagon socket screw 5.5 and the stuffing box 5.6. The valve seat 5.1 is in the shape of a round cake with a certain thickness, and the valve seat 5.1 is provided with a stepped central circular hole. The stepped table surface of the central circular hole of the valve seat 5.1 is a conical sealing surface. The valve stem 5.2 is a stepped shaft with an external thread at one end and an internal thread at the other end. The external thread of the valve stem 5.2 has the same specifications as the internal thread. The internal thread end of the valve stem 5.2 is provided with a boss. The spring 5.3 and the valve core 5.4 are sequentially mounted on the optical axis of the external thread end of the valve stem 5.2. The spring 5.3 is supported on On the boss end face of the valve stem 5.2, the valve core 5.4 is a truncated table with multiple steps. The valve core 5.4 is provided with a center hole. The center hole of the valve core 5.4 is transitionally matched with the valve stem 5.2. One end of the valve core 5.4 is close to the spring 5.3. The stepped table face of the other end of the valve core 5.4 is provided with a sealing surface. The valve core 5.4 is provided with a travel hole (long round hole) on the side close to the spring 5.3. The valve core 5.4 is fixed to the valve stem 5.2 by the hexagon socket screw 5.5. The external threaded end of the valve stem 5.2 passes through the valve seat 5.1 on the first tower plate 2.1 / second tower plate 3.1 and is connected to the internal thread of another valve stem 5.2 (the valve stem 5.2 of the first tower plate 2.1 / second tower plate 3.1 of the next layer) to form a whole. The valve stem 5.2 at the terminal of the one-way valve assembly 5 extends outward from the upper head 1.1, such as Figure 7As shown, the extended portion of the terminal valve stem 5.2 is sleeved with the stuffing box 5.6, and the terminal valve stem 5.2 is externally connected to the axially movable cylinder 6, and is characterized in that the opening and closing of the one-way valve assembly 5 is controlled by the axial movement of the cylinder 6.

[0040] The reactor adopts a vertical jacket structure design. The upper and lower heads are welded to the cylindrical barrel through the jacket flange to form an integral reaction vessel. This vertical structure is conducive to the flow of reaction materials, and also facilitates the installation and maintenance of internal components such as trays and one-way valves. The top of the upper head is provided with a material outlet, and the bottom of the lower head is provided with a material inlet. The inlet and outlet of the material are respectively arranged at the upper and lower parts of the reactor, which is conducive to forming a good flow path and improving the uniformity of the residence time distribution of the material in the reactor, thereby improving the overall efficiency of the reaction.

[0041] The reactor uses an alternating arrangement of edge riser trays and center riser trays, both of which are monolithic. The edge riser trays consist of a first tray and a first ring tray, allowing the material to flow radially, while the center riser trays consist of a second tray and a second ring tray, with a riser tube in the center to redistribute the material. The coordination of the two trays greatly improves the uniformity of material flow inside the reactor, helps improve the overall efficiency of the reaction, and creates more favorable conditions for subsequent polymerization reactions.

[0042] The edge riser tray is evenly provided with multiple collars and multiple valve seats on the first tray, which not only helps to evenly distribute the material, but also facilitates the installation and adjustment of the one-way valve assembly. Even when shut down, the edge riser tray can achieve complete discharge of the material in the entire reactor, avoiding the problem of the material becoming waste and improving the convenience of equipment maintenance. The riser design of the central riser tray can effectively control the flow of the material, making it present a good radial distribution characteristic. At the same time, the closed liquid distribution hole between the light edge end of the riser tube and the second tray can further improve the flow distribution of the material and enhance the stirring and mixing effect.

[0043] The fixed-pitch screw design is a hexagonal steel rod with an external thread on one end and an internal thread on the other end, which can be connected into one piece through threads. This not only ensures the stable arrangement of the tower plates inside the reactor, but also facilitates the installation and adjustment of the one-way valve assembly, thereby improving the maintainability of the equipment.

[0044] The application of the one-way valve assembly can accurately control the flow path of the material, and through the reliable opening and closing of the valve core, the fine regulation of the material flow can be achieved. The structural design of the one-way valve assembly fully considers the reliability requirements during use, effectively controls the valve's action stroke and sealing performance, and provides a strong guarantee for the stable operation of the entire reaction system. In addition, the extended part of the terminal valve stem of the one-way valve assembly is also equipped with a stuffing box, which not only ensures the sealing of the valve, but also facilitates subsequent adjustments and maintenance.

[0045] like Fig. 9 As shown, in this embodiment, the check valve assembly 5 is closed by pressing down the valve stem 5.2 of the online reactor, and the three-way valve connected to the online reactor is further controlled to control the material: the three-way valve discharge end 8.2 of the pipeline between the bottom of the lower head 1.4 of the online reactor and the pre-polycondensation reactor is closed, and the three-way valve 8.1 of the pipeline between the bottom of the lower head 1.4 of the online reactor and the polymer gear pump is opened. The esterification product is transported into the online reactor by the polymer gear pump 9, and part of the stable EG and the catalyst are injected into the esterification product pipeline by the first additive injection nozzle 10 arranged before the online reactor. The stable EG is heated by the guide inside the jacket of the online reactor, and the stable EG in the online reactor is heated and vaporized to form small bubbles. During the operation, the inside of the online reactor is filled with esterification materials, and the small bubbles play a role in stirring and mixing the esterification materials inside the online reactor, and continue to react with the residual PTA. Other additives required by the product are injected into the esterification product pipeline by the second additive injection nozzle 11 arranged after the online reactor, and the mixed materials enter the pre-polycondensation reactor together for polycondensation reaction.

[0046] When the device is shut down, after the polymer gear pump is shut down, the check valve assembly 5 is opened by lifting the valve stem 5.2 of the online reactor, the three-way valve feed end 8.1 of the pipeline between the bottom of the lower head 1.4 of the online reactor and the polymer gear pump is closed, and the three-way valve 8.2 of the pipeline between the bottom of the online reactor and the pre-polycondensation reactor is opened. Under the action of gravity, the esterified material inside the online reactor flows from top to bottom through the opened check valve assembly 5, and is sent to the pre-polycondensation reactor by the gear pump 9 arranged at the bottom of the lower head 1.4 of the online reactor.

[0047] From the production operation process, first, the one-way valve assembly is closed by pressing down the valve stem to cut off the pipeline connection between the online reactor and the pre-polycondensation reactor. At the same time, the pipeline valve between the online reactor and the polymer gear pump is opened, and the gear pump is started to transport the esterification product into the online reactor. In this process, part of the stable EG and catalyst will be injected into the esterification product pipeline through the first additive injection nozzle. After entering the online reactor, the stable EG will heat up and vaporize under the heating of the jacket to form small bubbles. These small bubbles produce a stirring and mixing effect in the esterification material inside the reactor, and continue to react with the residual PTA to esterify. After the reaction is completed, other additives required for the product are also injected into the pipeline through the second additive injection nozzle at the rear end, and after mixing with the aforementioned materials, they enter the pre-polycondensation reactor together for the next polycondensation reaction.

[0048] When the device is shut down, first stop the gear pump, then lift the valve stem to open the one-way valve assembly. At this time, close the pipeline valve between the online reactor and the gear pump, and open the pipeline valve between the online reactor and the pre-polycondensation reactor. Under the action of gravity, the esterified material inside the online reactor will flow from top to bottom through the open one-way valve and be transported to the pre-polycondensation reactor by the gear pump below. This design can not only achieve the complete discharge of the material inside the online reactor, but also avoid the problems caused by material residue, greatly improving the maintenance convenience of the equipment.

[0049] On the whole, the operation process of the online reactor disclosed in this embodiment is automated and intelligent. Through the precise control of the valve, the material flow direction can be finely adjusted to ensure the stable progress of the reaction process. The use of a one-way valve assembly can not only accurately control the flow path of the material, but also realize the opening and closing of the valve through the automatic drive of the cylinder, thereby improving the convenience of operation. In addition, the material discharge measures taken during shutdown also fully consider the needs of equipment maintenance, creating good conditions for subsequent inspection and maintenance.

[0050] The operation method disclosed in this scheme not only solves the problems existing in traditional reactors in terms of material flow control and equipment maintenance, but also further improves the controllability of the entire reaction process. Through the refined control of material flow and material discharge during shutdown, it can not only ensure the stable progress of the reaction, but also minimize the loss of materials, thereby greatly improving production efficiency and product quality. At the same time, the convenience of equipment maintenance is greatly improved, which also creates favorable conditions for long-term stable operation.

[0051] Specifically, first of all, the vertical jacketed reactor shell design not only optimizes the flow path of the material, but also greatly improves the maintenance convenience of the equipment. This structure forms an integral reaction vessel through the integral welding of the upper and lower heads with the cylindrical barrel, which is conducive to the flow of materials and also facilitates the installation and maintenance of internal components. In addition, the upper and lower heads are respectively provided with material inlets and outlets, which helps to form a good flow path and improve the uniformity of the residence time distribution of the material in the reactor, thereby improving the efficiency of the entire reaction process.

[0052] Secondly, the alternating arrangement of the trays and the unique structural design enable the synergistic effect of the edge riser tray and the center riser tray, which not only improves the flow distribution of materials inside the reactor and enhances the stirring and mixing effects, but also creates more favorable conditions for subsequent polymerization reactions. Among them, the radial flow characteristics of the edge riser tray and the riser design of the center riser tray both reflect the refined control of material flow. At the same time, the monolithic structure of the tray and the integrated connection design of the fixed-pitch screw not only simplify installation and commissioning, but also enhance overall stability.

[0053] In addition, through the reliable opening and closing of the valve core, the one-way valve assembly can accurately control the flow path of the material and achieve fine regulation of the entire reaction process. In particular, the connection between the terminal valve stem and the cylinder realizes the automatic drive of the valve opening and closing, further improving the convenience of operation. In addition, the structural design of the one-way valve assembly also fully considers the sealing performance, ensuring the reliable performance of the valve under various working conditions, and providing a strong guarantee for the stable operation of the reactor.

[0054] Finally, this solution also has a design for material discharge during shutdown. Through the application of packing seals and other measures, the material inside the online reactor can be completely discharged during shutdown, avoiding problems caused by material residues and greatly improving the convenience of equipment maintenance. This not only ensures that the reactor remains in good condition during long-term operation, but also creates favorable conditions for subsequent inspection and maintenance.

[0055] Example 2 like Figure 8 As shown, the difference between this embodiment and Embodiment 1 is that the driving mode of the one-way valve assembly 5 is different. In this embodiment, the terminal valve stem 5.2 of the one-way valve assembly 5 is connected as a whole with the float 7 arranged inside the reactor shell 1, and the one-way valve assembly 5 is installed inverted (the one-way valve assembly 5 is located on the lower side of the first tower plate 2.1 / the second tower plate 3.1). After the inside of the reactor shell 1 is filled with esterified material, the float 7 is subject to the upward buoyancy of the material, and the float 7 drives the one-way valve assembly 5 to move upward together, and the one-way valve assembly 5 is closed.

[0056] After a cavity appears on the top of the reactor shell 1, the float 7 is no longer subject to buoyancy, and the float 7 and the one-way valve assembly 5 move downward together under the action of gravity, and the one-way valve assembly 5 opens.

[0057] Specifically, when the reactor shell 1 is filled with esterified material, the float 7 will be subject to the upward buoyancy of the material, driving the connected one-way valve assembly 5 to move upward together, so that the one-way valve assembly 5 is in a closed state. This design can effectively control the flow direction of the material, ensuring that it flows along the preset path, which is conducive to the stable progress of the reaction. When a cavity appears on the top of the reactor shell 1 and the float 7 is no longer subject to the buoyancy, the float 7 will move downward together with the one-way valve assembly 5 under the action of gravity, so that the one-way valve assembly 5 opens. This automatic opening and closing mechanism can not only accurately control the flow of materials, but also effectively avoid the backflow of materials, providing a strong guarantee for the smooth progress of the entire reaction process.

[0058] In this embodiment, the one-way valve assembly 5 is installed upside down and is located at the lower side of the first tray 2.1 / the second tray 3.1. This arrangement is conducive to stabilizing the flow of materials and is also more conducive to the maintenance and repair of the one-way valve assembly 5. In addition, compared with Example 1, this solution also omits the design of the external cylinder, has a more compact structure, and is simpler and more convenient to operate.

[0059] In general, this embodiment proposes a new solution in the driving mechanism of the one-way valve assembly 5, making full use of the buoyancy characteristics of the material itself and achieving the goal of automatic control. This can not only ensure the stable operation of the entire reaction process, but also further simplify the system structure and reduce the manufacturing and maintenance costs of the equipment.

[0060] During the production operation, the one-way valve assembly 5 is first closed by manual operation to cut off the connection between the online reactor and the downstream equipment. At this time, the esterified material inside the reactor will fill the entire reaction container, and the float 7 will be driven by the upward buoyancy of the material to move the connected one-way valve assembly 5 upward, so that the one-way valve assembly 5 remains in a closed state.

[0061] In this state, the heating system inside the reactor can be started to heat the stabilized EG, causing it to heat up and vaporize to form small bubbles. These small bubbles can effectively improve the flow distribution of the material and improve the overall efficiency of the reaction under the stirring action inside the reactor. At the same time, other required additives can be injected through the pipeline, fully mixed with the vaporized stabilized EG and the initial esterification material, and then enter the downstream pre-condensation reactor.

[0062] When shutdown is required, the feeding system is first closed. When a cavity appears inside the reactor, the float 7 is no longer affected by buoyancy and will drop together with the one-way valve assembly 5 under the action of gravity, so that the one-way valve assembly 5 opens. At this time, the esterified material inside the reactor will flow from top to bottom through the opened one-way valve assembly 5 under the action of gravity, and will be transported to the pre-condensation reactor by the delivery pump below. This automatic opening and closing mechanism based on float drive not only ensures the orderly flow of materials, but also realizes the complete discharge of materials inside the reactor, avoiding problems caused by material residues, and greatly improving the convenience of equipment maintenance.

[0063] Compared with Example 1, this embodiment adopts a solution in which the float is directly connected to the one-way valve stem, which not only realizes automatic control, but also further simplifies the system structure and reduces the manufacturing and maintenance costs of the equipment. Especially in the process of material discharge during shutdown, this automatic opening and closing mechanism can ensure the smooth flow of materials, avoiding the cumbersome steps of manually operating the valve stem in Example 1.

[0064] From the process flow, this embodiment still retains the key technologies in Example 1, such as the reactor shell of the vertical jacket structure, the alternately arranged edge riser trays and the center riser trays, etc. These innovative designs are not only conducive to the flow distribution of materials, but also create good conditions for the subsequent polymerization reaction. At the same time, the opening and closing of the one-way valve is automatically controlled by the float, which further optimizes the controllability of the entire reaction process and ensures the orderly flow of materials.

[0065] It should be noted that the float-driven check valve solution needs to fully consider the structural design and material selection of the float in practical applications to ensure that it can reliably perform the expected control function under various working conditions. At the same time, in order to further improve the convenience and safety of operation, it is also possible to consider introducing advanced intelligent control technology to achieve all-round optimization of the entire reaction process.

[0066] This embodiment not only solves the limitations of manual operation in Example 1, but also further simplifies the system structure and reduces the manufacturing and maintenance costs of the equipment. This solution based on automatic control of the float ball not only ensures the reliability of the material flow, but also realizes the complete discharge of the material inside the reactor, greatly improving the convenience of equipment maintenance. At the same time, this design combined with other key technologies in Example 1 provides effective guarantee for improving the controllability and production efficiency of the entire reaction process.

Claims

1. An online reactor, characterized in that: The invention comprises a reactor shell, wherein edge riser plates and central riser plates are alternately arranged inside the reactor shell; and a fixed-distance screw rod provided with a one-way valve assembly, wherein both the edge riser plates and the central riser plates are connected to the fixed-distance screw rod.

2. According to the online reactor of claim 1, the reactor shell includes a cylindrical body, and an upper head and a lower head are respectively provided at both ends of the cylindrical body, and the reactor shell is a vertical jacket structure; the upper head is welded to the cylindrical body through a first jacket flange, and a material outlet is provided at the top of the upper head; the lower head is welded to the cylindrical body through a second jacket flange, and a material inlet is provided at the bottom of the lower head.

3. The in-line reactor according to claim 1, characterized in that: The edge riser tube tray and the center riser tube tray are both monolithic trays, the edge riser tube trays and the center riser tube trays are alternately arranged up and down, and the fixed-distance screw supports the trays and maintains the tray spacing.

4. The in-line reactor according to claim 1, characterized in that: The edge riser tower plate includes a first tower plate and a first ring plate. The first tower plate is a circular thin plate. The first tower plate is offset upward and connected to the first ring plate. A plurality of collars and a plurality of valve seats are evenly arranged on the first tower plate, and the top of the valve seat is flush with the first tower plate.

5. The in-line reactor according to claim 1, characterized in that: The central riser tube tower plate includes a second tower plate and a second ring plate. A central hole is provided in the center of the second tower plate, and a riser tube is provided in the central hole. Both ends of the riser tube are equidistant from the second tower plate, one end is a smooth edge, and the other end is evenly distributed with trapezoidal tooth gaps. A closed liquid distribution hole is provided between the smooth edge end of the riser tube and the second tower plate.

6. The in-line reactor according to claim 5, characterized in that: A plurality of collars and a plurality of valve seats are evenly arranged on the second tower plate, the sealing surface of the valve seat is on the same side as the smooth edge end of the riser tube, and the second ring plate is on the same side as the smooth edge end of the riser tube; a pressure plate semi-enclosed by the second ring plate is arranged on the second tower plate, a pressure ring is arranged on the inner side of the pressure plate facing the second tower plate, and the pressure ring presses the packing on the second tower plate to complete the sealing of the second ring plate.

7. The in-line reactor according to claim 4 or 5, characterized in that: The fixed-distance screw is a hexagonal steel rod with an external thread at one end and an internal thread at the other end. The external thread and the internal thread have the same specifications. The external thread end of the fixed-distance screw passes through a collar and is threadedly connected to the internal thread of another fixed-distance screw.

8. The in-line reactor according to any one of claims 1 to 6, characterized in that: The one-way valve assembly includes the valve seat, valve stem, spring, valve core and screws. One end of the valve stem is provided with an external thread and the other end is provided with an internal thread. The valve core is a frustum with multiple steps. The valve core is provided with a center hole, and the center hole is transitionally matched with the valve stem. The valve core is provided with a travel hole on the side close to the spring, and the valve core is fixed to the valve stem by screws.

9. The in-line reactor according to claim 8, characterized in that: Each layer of edge riser tray / center riser tray is provided with several groups of one-way valve assemblies, and the one-way valve assemblies of different layers of trays are connected as a whole through the valve stem threads, and the valve stem of the one-way valve assembly extends out of the reactor upper head, and the extended valve stem is provided with a packing seal.

10. The in-line reactor according to claim 8, characterized in that: The external threaded end of the valve stem passes through the valve seat and is threadedly connected to the internal thread of another valve stem to form an integral whole. The valve stem of the one-way valve assembly extends outwardly from the upper sealing head. The protruding part of the valve stem is set with a stuffing box. The valve stem is externally connected to an axially movable cylinder. The axial movement of the axially movable cylinder controls the opening and closing of the one-way valve assembly.

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