Chemical product continuous production device

Abstract

The utility model discloses a continuous production device for chemical product, including batching unit and circulating reaction unit, the circulating reaction unit includes tubular reactor, circulating pump and heat exchanger, the feed inlet of tubular reactor is linked with the discharge port of batching unit, the discharge port of tubular reactor is linked with the feed inlet of circulating pump, the discharge port of circulating pump is linked with the feed inlet of heat exchanger, the discharge port of heat exchanger is linked with the back material port of tubular reactor, and the connecting pipeline between the discharge port of heat exchanger and the back material port of tubular reactor is provided with the discharge pipeline of circulating reaction unit, the production device can realize the continuous stable production of chemical product of the utility model, not only has improved production efficiency, can also guarantee product quality stability, and has reduced energy consumption, is applicable to industrialization large -scale production.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical product production equipment, specifically to a continuous chemical product production equipment. Background Technology

[0002] In the intermittent production of chemical products, each batch of production requires equipment start-up, shutdown, debugging, cleaning, and loading and unloading of raw materials. Because the equipment cannot operate continuously, energy consumption increases, equipment capacity is limited, production efficiency is reduced, and production costs are increased. Moreover, because the production conditions of each batch fluctuate and mass and heat transfer is uneven, the product quality varies greatly between batches, reducing product quality stability. In addition, intermittent production is also difficult to meet the market demand for rapid supply of large-scale products.

[0003] Therefore, there is an urgent need to develop a continuous production equipment for chemical products that can improve production efficiency, ensure stable product quality, reduce energy consumption, and is suitable for industrialization. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a continuous production device for chemical products, which can realize the continuous and stable production of chemical products and is suitable for large-scale industrial production.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A continuous production apparatus for chemical products includes a batching unit and a circulating reaction unit;

[0007] The batching unit includes at least one delivery pump for conveying raw materials to the circulating reaction unit;

[0008] The circulating reaction unit includes a tubular reactor, a circulating pump, and a heat exchanger. The inlet of the tubular reactor is connected to the outlet of the batching unit, the outlet of the tubular reactor is connected to the inlet of the circulating pump, the outlet of the circulating pump is connected to the inlet of the heat exchanger, the outlet of the heat exchanger is connected to the return port of the tubular reactor, and the outlet of the circulating reaction unit is provided on the connecting pipeline between the outlet of the heat exchanger and the return port of the tubular reactor.

[0009] The tubular reactor includes a shell, a stirring shaft disposed within the shell, and a plurality of stirring blades disposed on the stirring shaft and distributed along its axial direction. The stirring shaft is a hollow structure and has a plurality of discharge holes. One end of the stirring shaft extends out of the shell of the tubular reactor and is provided with a rotary joint. The rotary joint is fixed to the shell of the tubular reactor by a bracket. The tubular reactor has at least two feed inlets, one of which is located on the rotary joint and communicates with the interior of the stirring shaft, while the other feed inlets are located on the shell of the tubular reactor. The discharge port and return port of the tubular reactor are located on the shell of the tubular reactor.

[0010] In the above technical solution, the tubular reactor has at least two feed inlets. One feed inlet is located on the rotary joint and communicates with the inside of the stirring shaft, while the other feed inlets are located on the shell of the tubular reactor. During feeding, different raw materials can be introduced through different feed inlets. Since the stirring shaft of the tubular reactor is hollow and has a discharge hole, the raw materials entering through the feed inlet on the rotary joint at the end of the stirring shaft can be discharged through the discharge hole. Simultaneously, the stirring shaft rotates, achieving uniform dispersion of the raw materials, improving the mixing effect between different raw materials, and avoiding the problem of increased byproducts caused by excessively high or low local raw material concentrations. This design addresses issues such as material residue problems caused by reduced contact with raw materials in the later stages of the reaction. Furthermore, the tubular reactor is equipped with a return port connected to a circulation pump. The circulation pump drives the reactants back into the tubular reactor at high speed, achieving strong radial turbulence, further enhancing the mixing effect between the reactants and ensuring sufficient mass transfer, thereby improving reaction efficiency. Additionally, a heat exchanger is installed between the tubular reactor and the circulation pump to regulate the reaction temperature, preventing localized overheating or overcooling during the reaction, reducing the occurrence of side reactions, ensuring stable reaction conditions, and thus guaranteeing stable product quality.

[0011] Preferably, the circulating pump is a centrifugal pump, axial flow pump, or rotary pump; the tubular reactor is a vertical tubular reactor or a horizontal tubular reactor; and the transfer pump is a centrifugal pump, axial flow pump, or rotary pump, used to transfer liquid raw materials.

[0012] Preferably, the stirring blade has a hollow structure and is connected to the inner cavity of the stirring shaft, and the stirring blade is provided with a plurality of discharge holes.

[0013] In the above technical solution, the present invention designs the stirring blade as a hollow structure and sets a discharge hole. The raw material entering through the feed port on the rotary joint at the end of the stirring shaft can not only be discharged from the discharge hole of the stirring shaft, but also from the discharge hole of the stirring blade. At the same time, the stirring shaft and the stirring blade are rotating, which can further promote the uniform dispersion of the raw material, enhance the mixing effect, and avoid the local concentration of the raw material in the reaction system being too high or too low.

[0014] Preferably, the stirring blades are at least one of the following: propeller type, ribbon type, folding blade type, turbine type, and anchor frame type.

[0015] Preferably, the tubular reactor is provided with a heat exchange jacket outside the shell, and the heat exchange jacket is provided with a heat exchange medium inlet and a heat exchange medium outlet.

[0016] Preferably, the tubular reactor has a hollow discharge element inside its shell that communicates with the feed inlet and / or return inlet on the shell, and the hollow discharge element has a plurality of discharge holes.

[0017] Preferably, the hollow feeding element is a U-shaped feeding tube, a V-shaped feeding tube, a serpentine feeding tube, an elliptical feeding tube, a rhomboid feeding tube, or a circular feeding tube.

[0018] In the above technical solution, the present invention also provides a discharge element with a discharge hole at the feed inlet and return outlet of the tubular reactor, which helps to discharge materials efficiently, disperse raw materials, and improve the mixing effect of raw materials.

[0019] Preferably, a drive motor is connected to one end of the stirring shaft of the tubular reactor that extends out of the shell, and the drive motor is fixed on the shell of the tubular reactor; a drive gear is sleeved on the output shaft of the drive motor, and a driven gear that meshes with the drive gear is sleeved on the stirring shaft of the tubular reactor.

[0020] Preferably, the batching unit further includes a batching tank and / or a mixer; the outlet of the batching tank is connected to the inlet of the conveying pump, the inlet of the mixer is connected to the outlet of the conveying pump, and the outlet of the mixer is connected to the inlet of the tubular reactor.

[0021] In the above technical solutions, when the batching unit includes a batching tank, the outlet of the batching tank is connected to the inlet of the conveying pump, and the outlet of the conveying pump is connected to the inlet of the tubular reactor; when the batching unit includes a mixer, the inlet of the mixer is connected to the outlet of the conveying pump, and the outlet of the mixer is connected to the inlet of the tubular reactor; when the batching unit includes both a batching tank and a mixer, the outlet of the batching tank is connected to the inlet of the conveying pump, the outlet of the conveying pump is connected to the inlet of the mixer, and the outlet of the mixer is connected to the inlet of the tubular reactor. This utility model, by setting a batching tank and / or a mixer, can further promote uniform mixing of raw materials to reduce the occurrence of side reactions. Furthermore, the batching tank can also be set within a heating or cooling device to pre-melt solid raw materials or control the temperature of high-temperature liquid raw materials.

[0022] Preferably, it further includes an aging unit and / or a post-processing unit, wherein the inlet of the aging unit is connected to the outlet pipe of the circulating reaction unit, and the inlet of the post-processing unit is connected to the outlet pipe of the circulating reaction unit or the outlet of the aging unit.

[0023] The aging unit is an aging reactor, which can specifically be a reaction vessel, a dynamic tubular reactor, or a static tubular reactor.

[0024] The post-processing unit includes one or more of the following: heat exchange unit, separation unit, distillation unit, and drying unit.

[0025] In the above technical solution, the heat exchange unit in the post-processing unit specifically adopts a post-processing heat exchanger, the separation unit specifically adopts a solid-liquid separator or an oil-water separator, the distillation unit specifically adopts a distillation column, and the drying unit specifically adopts a dryer. The post-processing unit can remove impurities from the product, thereby improving its quality.

[0026] Preferably, the circulating reaction unit is provided with at least one stage. When the circulating reaction unit is provided with two or more stages, the multi-stage circulating reaction units are arranged in series or in parallel.

[0027] In the above technical solution, the circulating reaction unit can be set in multiple stages, and the multi-stage circulating reaction units can be connected in series or in parallel according to production needs, which is suitable for large-scale and continuous industrial production.

[0028] The beneficial effects of this utility model are as follows:

[0029] (1) The production device of this utility model achieves continuous production process by using a batching unit, a circulating reaction unit consisting of a tubular reactor, a circulating pump and a heat exchanger, and setting an aging unit and a post-processing unit according to production needs. This reduces the number of times the equipment is frequently started and stopped, effectively avoids high energy consumption during equipment start and stop, fully utilizes equipment capacity, significantly improves production efficiency, and also reduces manual intervention and operational risks. The continuous production device can ensure that the quality of each batch of products is consistent and guarantees product quality stability.

[0030] (2) In the circulating reaction unit of this utility model, the tubular reactor has at least two feed inlets. One feed inlet is located on the rotary joint and communicates with the inside of the stirring shaft. The other feed inlets are located on the shell of the tubular reactor. During feeding, different raw materials can be introduced from different feed inlets. Since the stirring shaft and stirring blades of the tubular reactor are hollow and have discharge holes, the raw materials entering through the feed inlet on the rotary joint at the end of the stirring shaft can be discharged from the discharge holes of the stirring shaft and stirring blades. At the same time, the stirring shaft rotates, realizing the uniform dispersion of the raw materials, improving the mixing effect between different raw materials, and avoiding the local raw material concentration being too high or too low. This addresses the issues of increased byproducts and residual raw materials due to reduced contact with raw materials in the later stages of the reaction. Furthermore, the tubular reactor is equipped with a return port connected to a circulation pump. The circulation pump drives the reactants back into the tubular reactor at high speed, achieving strong radial turbulence, further enhancing the mixing effect between the reactants and ensuring sufficient mass transfer, thereby improving reaction efficiency. Additionally, a heat exchanger is installed between the tubular reactor and the circulation pump to regulate the reaction temperature, preventing localized overheating or overcooling during the reaction, reducing the occurrence of side reactions, ensuring stable reaction conditions, and thus guaranteeing stable product quality. Attached Figure Description

[0031] To clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the production device according to Embodiment 1 of this utility model;

[0033] Figure 2 This is a schematic diagram of the tubular reactor in the circulating reaction unit of Embodiment 1 of this utility model;

[0034] Figure 3 This is a schematic diagram of the production device according to Embodiment 2 of this utility model;

[0035] Figure 4 This is a schematic diagram of the tubular reactor in the circulating reaction unit of Embodiment 2 of this utility model;

[0036] Figure 5 This is a schematic diagram of the production device of Embodiment 3 of this utility model;

[0037] Figure 6 This is a schematic diagram of the production device of Embodiment 4 of this utility model;

[0038] Figure 7 This is a schematic diagram of the production device of Embodiment 5 of this utility model;

[0039] Figure 8 This is a schematic diagram of the production device of Embodiment 6 of this utility model.

[0040] The image is labeled as follows:

[0041] 1. Batching unit; 11. Transfer pump; 12. Batching tank; 13. Mixer; 2. Circulating reaction unit; 21. Tubular reactor; 211. Shell; 212. Stirring shaft; 213. Stirring blades; 214. Discharge port; 215. Rotary joint; 216. Drive motor; 217. Hollow discharge element; 218. Discharge port; 219. Tubular reactor inlet; 2110. Tubular reactor outlet; 2111. Tubular reactor return port; 22. Circulating pump; 23. Heat exchanger; 24. Discharge pipeline of circulating reaction unit; 3. Aging unit; 31. Aging reactor; 4. Post-treatment unit; 41. Post-treatment heat exchanger; 42. Solid-liquid separator; 43. Distillation column. Detailed Implementation

[0042] This utility model provides a continuous production apparatus for chemical products. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following provides a more detailed description of this utility model. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit this utility model.

[0043] In the description of this utility model, it should be understood that the terms "upper", "lower", "inner", "outer", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] The present invention will now be described in detail with reference to the accompanying drawings.

[0045] Example 1

[0046] Reference Figure 1 and Figure 2 This embodiment provides a continuous production device for chemical products, including a batching unit 1 and a circulating reaction unit 2 connected to the outlet of the batching unit 1, and the circulating reaction unit 2 is provided in a single stage.

[0047] The aforementioned batching unit 1 includes two conveying pumps 11 for transporting raw materials to the circulating reaction unit 2. The inlets of the two conveying pumps 11 are respectively connected to the first raw material tank and the second raw material tank, and the outlets of the two conveying pumps 11 are respectively connected to the two inlets of the circulating reaction unit 2. Specifically, in this embodiment, the first raw material and the second raw material are liquids, and the conveying pumps can be centrifugal pumps, specifically centrifugal pumps with metering functions, to control the feed rate of the raw materials.

[0048] The aforementioned circulating reaction unit 2 includes a tubular reactor 21, a circulating pump 22, and a heat exchanger 23. Specifically, the circulating pump 22 is an axial flow pump, and the heat exchanger 23 is a shell-and-tube heat exchanger. The tubular reactor 21 specifically includes a shell 211, a stirring shaft 212 disposed within the shell 211, and a plurality of folded-blade stirring blades 213 disposed on the stirring shaft 212 and distributed along its axial direction. The stirring shaft 212 has a hollow structure and is provided with a plurality of discharge holes 214, with one end of the stirring shaft 212 extending out of the tubular reactor 21. A rotary joint 215 is rotatably mounted outside the shell 211. The rotary joint 215 is fixed to the shell 211 of the tubular reactor 21 by a bracket. The end of the stirring shaft 212 of the tubular reactor 21 that extends out of the shell 211 is also connected to a drive motor 216. The drive motor 216 is fixed to the shell 211 of the tubular reactor 21, and a drive gear is sleeved on the output shaft of the drive motor 216. A driven gear that meshes with the drive gear is sleeved on the stirring shaft 212. The drive motor 216 drives the stirring shaft 212 to rotate through the drive gear and the driven gear. In addition, in this embodiment, the circulating reaction unit 2 has two feed inlets, namely, the tubular reactor 21 is provided with two tubular reactor feed inlets 219, one of which is provided on the rotary joint 215 and communicates with the inside of the stirring shaft 212, and the other is provided on the shell 211 of the tubular reactor 21. Moreover, the shell 211 of the tubular reactor 21 is also provided with a tubular reactor outlet 2110 and a tubular reactor return port 2111.

[0049] In addition, to facilitate the fixing of the drive motor 216 and the bracket to the shell 211 of the tubular reactor 21, a fixing plate can be provided at the end of the shell 211 to fix the drive motor 216 and the bracket to the fixing plate.

[0050] In this embodiment, the two tubular reactor inlets 219 of the tubular reactor 21 in the circulating reaction unit 2 are respectively connected to the outlets of the two conveying pumps 11 in the batching unit 1. The tubular reactor outlet 2110 is connected to the inlet of the circulating pump 22. The outlet of the circulating pump 22 is connected to the inlet of the heat exchanger 23. The outlet of the heat exchanger 23 is connected to the return port 2111 of the tubular reactor. In addition, the discharge pipe 24 of the circulating reaction unit is provided on the connecting pipe between the outlet of the heat exchanger 23 and the return port 2111 of the tubular reactor for discharging the product.

[0051] Based on the above production apparatus, the first raw material is pumped to the inlet on the shell of the tubular reactor and enters the shell. The second raw material is pumped to the inlet on the rotary joint at the end of the stirring shaft of the tubular reactor and enters the stirring shaft. After flowing out through the outlet of the stirring shaft, it enters the shell of the tubular reactor. The first and second raw materials react and mix in the tubular reactor by the stirring shaft and the stirring blades on the stirring shaft to obtain reaction products. The reaction products are then discharged from the outlet of the tubular reactor and pumped to the heat exchanger for heat exchange via a circulating pump. Part of the reaction products are returned to the tubular reactor through the return port to continue the reaction, and part of the reaction products are discharged through the outlet pipeline of the circulating reaction unit to obtain the product. Through the above process, the continuous reaction of the first and second raw materials can be achieved, that is, the continuous production of the corresponding reaction products can be realized.

[0052] Furthermore, in the above reaction process, the first and second raw materials enter through the inlet on the shell of the tubular reactor and the inlet on the rotary joint at the end of the stirring shaft, respectively. The stirring shaft is equipped with an outlet, which allows the second raw material to be evenly dispersed into the reaction zone. This enables simultaneous enhancement of the feeding process and mechanical stirring, improving the mixing effect between different raw materials and avoiding the problem of increased byproducts due to excessively high or low local raw material concentrations, as well as the problem of raw material residue due to reduced contact probability in the later stages of the reaction. Moreover, the tubular reactor is equipped with a return port connected to a circulation pump. The circulation pump drives the reactants back into the tubular reactor at high speed, achieving strong radial turbulence, further enhancing the mixing effect between the reactants and ensuring sufficient mass transfer, thereby improving reaction efficiency. Additionally, a heat exchanger is installed between the tubular reactor and the circulation pump to regulate the reaction temperature, preventing local overheating or overcooling during the reaction process and ensuring stable reaction conditions, thus guaranteeing stable product quality.

[0053] Example 2

[0054] Reference Figure 3 and Figure 4 This embodiment provides a continuous production apparatus for chemical products, which differs from Embodiment 1 in that:

[0055] In this embodiment, a heat exchange jacket is provided on the outside of the shell 211 of the tubular reactor 21, and the heat exchange jacket is provided with a heat exchange medium inlet and a heat exchange medium outlet. The heat exchange jacket is used to introduce heat exchange medium and exchange heat with the reactants in the tubular reactor 21, thereby removing the heat generated by the reaction in time, improving the heat transfer efficiency of the tubular reactor, reducing the occurrence of side reactions, and improving the quality of the product.

[0056] In this embodiment, the stirring blade 213 is a combination of folding blade and anchor frame type. The stirring blade 213 located on the upper part of the stirring shaft 212 is folding blade type, and the stirring blade 213 located at the bottom of the stirring shaft 213 is anchor frame type. The stirring blade 213 has a hollow structure and is connected to the inner cavity of the stirring shaft 212. Several discharge holes 214 are also provided on the stirring blade 213. The raw material entering the stirring shaft through the feed port on the rotary joint at the end of the stirring shaft can not only flow out through the discharge holes of the stirring shaft, but also through the discharge holes of the stirring blades. This can further ensure that the second raw material is evenly dispersed in the reaction zone, thereby further avoiding excessively high or low local concentrations of raw materials in the reaction system, enhancing the mixing effect of raw materials, and improving production efficiency.

[0057] In addition, in this embodiment, the shell 211 of the tubular reactor 21 is provided with a hollow discharge element 217 that communicates with the feed inlet and return outlet on the shell 211. The hollow discharge element 217 is a V-shaped discharge pipe, and a plurality of discharge holes 218 are provided on the hollow discharge element 217. The hollow discharge element with discharge holes can further disperse the material, thereby improving the mixing effect of the raw materials.

[0058] Based on the above production apparatus, the first raw material is pumped to the inlet on the shell of the tubular reactor and dispersed through the discharge holes of the hollow discharge element before entering the shell of the tubular reactor. The second raw material is pumped to the inlet on the rotary joint at the end of the stirring shaft of the tubular reactor and enters the stirring shaft. After flowing out through the discharge holes of the stirring shaft and stirring blades, it enters the shell of the tubular reactor. The first and second raw materials react and are mixed in the tubular reactor by the stirring shaft and stirring blades to obtain reaction products. The reaction products are then discharged from the outlet of the tubular reactor and pumped to the heat exchanger for heat exchange via a circulating pump. Part of the reaction products are returned to the tubular reactor through the return port and dispersed through the discharge holes of the hollow discharge element of the return port to continue the reaction. Part of the reaction products are discharged through the discharge pipeline of the circulating reaction unit to obtain the final product. Through the above process, the continuous reaction of the first and second raw materials can be achieved, that is, the continuous production of the corresponding reaction products can be realized.

[0059] Example 3

[0060] Reference Figure 5This embodiment provides a continuous production apparatus for chemical products, which differs from Embodiment 2 in that:

[0061] In this embodiment, the circulating reaction unit 2 is configured with three stages, namely, a primary, a secondary, and a tertiary circulating reaction unit. The primary, secondary, and tertiary circulating reaction units have the same structure, each including a tubular reactor, a circulating pump, and a heat exchanger. The primary, secondary, and tertiary circulating reaction units are connected in series. Specifically, the discharge pipe of the primary circulating reaction unit is connected to the inlet of the tubular reactor shell of the secondary circulating reaction unit, the discharge pipe of the secondary circulating reaction unit is connected to the inlet of the tubular reactor shell of the tertiary circulating reaction unit, and the discharge pipe of the tertiary circulating reaction unit is used to discharge the reaction products.

[0062] In addition, the batching unit 1 in this embodiment also includes a batching tank 12, and the outlet of the batching tank 12 is connected to the inlet of the tubular reactor shell 211 of the primary circulating reaction unit via a conveying pump 11, for mixing at least two raw materials and conveying them into the tubular reactor.

[0063] In this embodiment, for ease of describing the use of the above-mentioned production device, the tubular reactor, circulating pump and heat exchanger of the first-stage circulating reaction unit are respectively referred to as the first-stage tubular reactor, the first-stage circulating pump and the first-stage heat exchanger; the tubular reactor, circulating pump and heat exchanger of the second-stage circulating reaction unit are respectively referred to as the second-stage tubular reactor, the second-stage circulating pump and the second-stage heat exchanger; and the tubular reactor, circulating pump and heat exchanger of the third-stage circulating reaction unit are respectively referred to as the third-stage tubular reactor, the third-stage circulating pump and the third-stage heat exchanger.

[0064] Based on the above-described production apparatus, the first, second, and third raw materials are mixed in a batching tank and then pumped to the inlet of the primary tubular reactor shell of the primary circulating reaction unit, entering the primary tubular reactor shell. The fourth raw material enters the stirring shaft through the inlet at the rotary joint at the end of the stirring shaft of the primary tubular reactor, and then enters the primary tubular reactor shell through the outlet holes of the stirring shaft and stirring blades. The fourth raw material reacts with the first to third raw materials in the primary tubular reactor to obtain the first reaction liquid. The first reaction liquid is discharged from the outlet of the primary tubular reactor and pumped to the primary circulating unit by the primary circulating pump. The first-stage heat exchanger generates a first circulating liquid. A portion of this first circulating liquid returns to the shell of the first-stage tubular reactor via the return port to continue reacting. Another portion is discharged through the discharge pipe of the first-stage circulating reaction unit and enters the shell of the second-stage tubular reactor via the inlet of the second-stage circulating reaction unit. In the second-stage circulating reaction unit, the fifth raw material enters the stirring shaft through the inlet at the rotary joint at the end of the stirring shaft, and then enters the shell of the second-stage tubular reactor via the discharge holes of the stirring shaft and stirring blades. The fifth raw material reacts with... Part of the first circulating liquid reacts in the secondary tubular reactor to obtain the second reaction liquid. The second reaction liquid is discharged from the outlet of the secondary tubular reactor and transported by the secondary circulation pump to the secondary heat exchanger for heat exchange to obtain the second circulating liquid. Then, part of the second circulating liquid returns to the shell of the secondary tubular reactor through the return port to continue participating in the reaction. Part of the second circulating liquid is discharged through the outlet pipeline of the secondary circulating reaction unit and enters the shell of the tertiary tubular reactor through the inlet of the tertiary circulating reaction unit. In the tertiary circulating reaction unit, the sixth raw material passes through the tertiary tubular reactor. The feed inlet at the rotary joint at the end of the stirring shaft enters the interior of the stirring shaft and then enters the shell of the three-stage tubular reactor through the discharge holes of the stirring shaft and stirring blades. The sixth raw material reacts with part of the second circulating liquid in the three-stage tubular reactor to obtain the third reaction liquid. The third reaction liquid is discharged from the discharge port of the three-stage tubular reactor and transported to the three-stage heat exchanger by the three-stage circulating pump to obtain the third circulating liquid. Then, part of the third circulating liquid returns to the shell of the three-stage tubular reactor through the return port to continue to participate in the reaction, and part of the third circulating liquid is discharged through the discharge pipeline of the three-stage circulating reaction unit to obtain the reaction product.

[0065] Example 4

[0066] Reference Figure 6 This embodiment provides a continuous production apparatus for chemical products, which differs from Embodiment 2 in that:

[0067] The batching unit 1 in this embodiment also includes a mixer 13. The inlet of the mixer 13 is connected to the outlet of the conveying pump 11, and the outlet of the mixer 13 is connected to the inlet of the tubular reactor 21. By setting up the mixer, the raw materials can be premixed, further improving the mixing degree of each raw material during the reaction in the circulating reaction unit, so that the raw materials are evenly distributed, improving the raw material conversion rate, reducing the occurrence of side reactions, and ensuring stable product quality.

[0068] In this embodiment, a hollow discharge element 217, connected to the feed inlet and return outlet on the shell 211 of the tubular reactor 21, is also provided inside the shell 211. The hollow discharge element 217 is a U-shaped discharge tube, and a plurality of discharge holes 218 are provided on the hollow discharge element 217. The hollow discharge element with discharge holes can further disperse the material, thereby improving the raw material mixing effect.

[0069] In addition, the production apparatus of this embodiment also includes an aging unit 3. The inlet of the aging unit 3 is connected to the outlet pipe 24 of the circulating reaction unit. The aging unit 3 includes at least one aging reactor 31, which can be a reaction vessel. In this embodiment, by setting up an aging unit, the reaction liquid flowing out of the circulating reaction unit is discharged and then enters the aging unit for subsequent aging reaction. After the aging reaction is completed, the aged product is obtained.

[0070] Based on the above production apparatus, the first and second raw materials are respectively transported to the mixer by a conveying pump for premixing. The mixed raw materials are then transported to the inlet on the shell of the tubular reactor of the circulating reaction unit and dispersed through the discharge hole of the hollow discharge element before entering the shell of the tubular reactor. The third raw material is transported by a conveying pump to the inlet on the rotary joint at the end of the stirring shaft of the tubular reactor and enters the inside of the stirring shaft. After flowing out through the discharge hole of the stirring shaft and stirring blades, it enters the shell of the tubular reactor. The first, second, and third raw materials react and obtain reaction products after being stirred and mixed in the tubular reactor by the stirring shaft and stirring blades on the stirring shaft. The reaction products are then discharged from the outlet of the tubular reactor and transported to the heat exchanger by a circulating pump for heat exchange. Part of the reaction products are returned to the tubular reactor through the return port of the tubular reactor and dispersed through the discharge hole of the hollow discharge element of the return port to continue the reaction. Part of the reaction products are transported to the aging reactor through the discharge pipeline of the circulating reaction unit for aging reaction. After aging is completed, the aged product is obtained.

[0071] Example 5

[0072] Reference Figure 7 This embodiment provides a continuous production apparatus for chemical products, which differs from Embodiment 4 in that:

[0073] In this embodiment, no aging unit is provided, but a post-processing unit 4 is connected to the discharge pipe 24 of the circulating reaction unit. The post-processing unit 4 includes a post-processing heat exchanger 41 and a solid-liquid separator 42. The discharge pipe 24 of the circulating reaction unit is connected to the inlet of the post-processing heat exchanger 41, and the discharge port of the post-processing heat exchanger 41 is connected to the inlet of the solid-liquid separator 42.

[0074] In this embodiment, the reaction products flowing out of the discharge pipe of the circulating reaction unit enter the post-processing unit. In the post-processing unit, the reaction products undergo heat exchange in the post-processing heat exchanger and then enter the solid-liquid separator for solid-liquid separation to remove impurities from the reaction products and improve product quality.

[0075] Example 6

[0076] Reference Figure 8 This embodiment provides a continuous production apparatus for chemical products, which differs from Embodiment 2 in that:

[0077] In this embodiment, the batching unit 1 further includes a batching tank 12 and a mixer 13. The outlet of the batching tank 12 is connected to the inlet of the conveying pump 11, the outlet of the conveying pump 11 is connected to the inlet of the mixer 13, and the outlet of the mixer 13 is connected to the inlet of the tubular reactor 21. In this embodiment, by setting up a batching tank and a mixer, the raw materials can be pre-mixed according to the proportion and then conveyed to the mixer for pre-mixing, thereby improving the mixing effect. The batching tank can be placed in a heating device or a cooling device for preheating or pre-cooling to ensure that the raw materials melt or the temperature is stable.

[0078] In this embodiment, the circulating reaction unit 2 is provided in two stages, including a primary and a secondary circulating reaction unit connected in series. The primary and secondary circulating reaction units have the same structure, both including a tubular reactor, a circulating pump and a heat exchanger. Specifically, the discharge pipeline of the primary circulating reaction unit is connected to the inlet of the tubular reactor shell of the secondary circulating reaction unit, and the discharge pipeline of the secondary circulating reaction unit is used to discharge the reaction products.

[0079] This embodiment also includes an aging unit 3 and a post-processing unit 4. The inlet of the aging unit 3 is connected to the outlet pipeline of the secondary circulation reaction unit, and the outlet of the aging unit 3 is connected to the inlet of the post-processing unit 4. Specifically, in this embodiment, the aging unit 3 is an aging reactor 31, and the aging reactor 31 is specifically selected from a dynamic tubular reactor. The post-processing unit 4 includes a post-processing heat exchanger 41 and a distillation column 43. The inlet of the post-processing heat exchanger 41 is connected to the outlet of the aging reactor 31, and the outlet of the post-processing heat exchanger 41 is connected to the inlet of the distillation column 43. The outlet of the distillation column 43 discharges the reaction product, and the product after distillation has high purity.

[0080] To facilitate the description of the operation of the above-mentioned production equipment, the tubular reactor, circulating pump and heat exchanger of the first-stage circulating reaction unit are respectively referred to as the first-stage tubular reactor, the first-stage circulating pump and the first-stage heat exchanger, and the tubular reactor, circulating pump and heat exchanger of the second-stage circulating reaction unit are respectively referred to as the second-stage tubular reactor, the second-stage circulating pump and the second-stage heat exchanger.

[0081] Based on the above production apparatus, the first and second raw materials are mixed and preheated or precooled in a batching tank, and then pumped to a mixer. The third raw material is added to the mixer. Inside the mixer, the first, second, and third raw materials are premixed and then pumped to the inlet of the primary tubular reactor shell of the primary circulating reaction unit, entering the primary tubular reactor shell. The fourth raw material enters the stirring shaft through the inlet at the rotary joint at the end of the stirring shaft, and then enters the primary tubular reactor shell through the outlet holes of the stirring shaft and stirring blades. The fourth raw material reacts with the first to third raw materials in the primary tubular reactor to obtain a first reaction liquid. The first reaction liquid is discharged from the outlet of the primary tubular reactor and pumped to a primary heat exchanger by a primary circulating pump to obtain a first circulating liquid. Then, part of the first circulating liquid returns to the shell of the primary tubular reactor through the return port to continue participating in the reaction, while another part of the first circulating liquid passes through the primary circulating reaction unit. The first raw material is discharged through the outlet pipe and enters the shell of the second-stage tubular reactor through the inlet of the second-stage circulating reactor. In the second-stage circulating reactor, the fifth raw material enters the inside of the stirring shaft through the inlet at the rotary joint at the end of the stirring shaft of the second-stage tubular reactor, and enters the shell of the second-stage tubular reactor through the outlet holes of the stirring shaft and stirring blades. The fifth raw material reacts with part of the first circulating liquid in the second-stage tubular reactor to obtain the second reaction liquid. The second reaction liquid is discharged from the outlet of the second-stage tubular reactor and transported to the second-stage heat exchanger by the second-stage circulating pump to obtain the second circulating liquid. Then, part of the second circulating liquid returns to the shell of the second-stage tubular reactor through the return port of the second-stage tubular reactor to continue to participate in the reaction. Part of the second circulating liquid is discharged through the outlet pipe of the second-stage circulating reactor to the aging reactor to continue aging to obtain the aging liquid. Then, the aging liquid enters the post-treatment unit consisting of the post-treatment heat exchanger and the distillation column to obtain a high-quality product after heat exchange, distillation and impurity removal.

[0082] Example 7

[0083] This embodiment utilizes the production apparatus of Example 6 to continuously produce phenolic resin. The specific production process is as follows:

[0084] Phenol and cresol are mixed and preheated in a mixing tank, then pumped to a mixer. Sodium hydroxide solution is added to the mixer. Inside the mixer, phenol, cresol, and sodium hydroxide solution are premixed and then pumped to the inlet of the primary tubular reactor shell in the primary circulating reaction unit, entering the reactor shell. Formaldehyde aqueous solution enters the stirring shaft through the inlet at the rotary joint at the end of the stirring shaft, and then flows into the reactor shell through the outlet holes of the stirring shaft and blades. Phenol, cresol, and formaldehyde are mixed and stirred in the primary tubular reactor, where they undergo a condensation reaction catalyzed by sodium hydroxide solution to obtain the first reaction liquid. The first reaction liquid is discharged from the outlet of the primary tubular reactor and pumped to the primary heat exchanger by a primary circulating pump to obtain the first circulating liquid. Part of the first circulating liquid returns to the reactor shell through the return port of the primary tubular reactor to continue participating in the reaction, while the remaining portion passes through the primary circulating reaction unit. The first circulating liquid is discharged through the outlet pipe and enters the shell of the second-stage tubular reactor through the inlet of the second-stage circulating reactor shell. In the second-stage circulating reactor unit, melamine enters the inside of the stirring shaft through the inlet at the rotary joint at the end of the stirring shaft of the second-stage circulating reactor, and enters the shell of the second-stage circulating reactor through the outlet holes of the stirring shaft and stirring blades. Unreacted formaldehyde in the first circulating liquid reacts with melamine in the second-stage circulating reactor to obtain the second reaction liquid. The second reaction liquid is discharged from the outlet of the second-stage circulating reactor and transported to the second-stage heat exchanger by the second-stage circulating pump to obtain the second circulating liquid. Then, part of the second circulating liquid returns to the shell of the second-stage circulating reactor through the return port of the second-stage circulating reactor to continue to participate in the reaction. Part of the second circulating liquid is discharged through the outlet pipe of the second-stage circulating reactor unit to the aging reactor to continue aging to obtain the aging liquid. Then, the aging liquid enters the post-treatment unit consisting of the post-treatment heat exchanger and the distillation column to obtain high-quality phenolic resin products after heat exchange, distillation and impurity removal.

[0085] It should be noted that, in order to ensure continuous production of the production unit, pumping equipment, such as ordinary transfer pumps or metering pumps with metering functions, is installed on the connecting pipelines between the equipment according to the conveying requirements between the equipment; valves and fittings are also installed on the connecting pipelines between the equipment to facilitate the control of shutting down the corresponding equipment in case of emergencies or maintenance.

[0086] Furthermore, in this utility model, unless otherwise explicitly specified or limited, the connection methods between the various devices should be interpreted broadly. For example, it can be a direct pipeline connection, or it can be a pipeline connection through conventional conveying, metering, control, and temporary storage equipment such as pumping equipment, metering equipment, valves and fittings, and intermediate tanks. It can be a fixed connection or a detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0087] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A continuous production apparatus for chemical products, characterized in that, It includes a batching unit (1) and a recycling reaction unit (2); The batching unit (1) includes at least one delivery pump (11) for conveying raw materials to the circulating reaction unit (2). The circulating reaction unit (2) includes a tubular reactor (21), a circulating pump (22), and a heat exchanger (23). The inlet of the tubular reactor (21) is connected to the outlet of the batching unit (1). The outlet of the tubular reactor (21) is connected to the inlet of the circulating pump (22). The outlet of the circulating pump (22) is connected to the inlet of the heat exchanger (23). The outlet of the heat exchanger (23) is connected to the return port of the tubular reactor (21). The outlet pipe (24) of the circulating reaction unit is provided on the connecting pipe between the outlet of the heat exchanger (23) and the return port of the tubular reactor (21). The tubular reactor (21) includes a shell (211), a stirring shaft (212) disposed within the shell (211), and a plurality of stirring blades (213) disposed on the stirring shaft (212) and distributed along its axial direction; the stirring shaft (212) is a hollow structure and is provided with a plurality of discharge holes (214); one end of the stirring shaft (212) extends out of the shell (211) of the tubular reactor (21) and is rotatably provided with a rotary joint (215). The rotary joint (215) is fixed to the shell (211) of the tubular reactor (21) by a bracket; the tubular reactor (21) has at least two feed inlets, one of which is located on the rotary joint (215) and communicates with the inside of the stirring shaft (212), and the other feed inlets are located on the shell (211) of the tubular reactor (21), and the discharge port and return port of the tubular reactor (21) are located on the shell (211) of the tubular reactor (21).

2. The continuous production apparatus for chemical products according to claim 1, characterized in that, The stirring blade (213) has a hollow structure and is connected to the inner cavity of the stirring shaft (212). The stirring blade (213) is provided with a number of discharge holes (214).

3. The continuous production apparatus for chemical products according to claim 1, characterized in that, The stirring blade (213) is at least one of the following: propeller type, ribbon type, folding blade type, turbine type, and anchor frame type.

4. The continuous production apparatus for chemical products according to claim 1, characterized in that, The tubular reactor (21) has a heat exchange jacket on the outside of its shell (211), and the heat exchange jacket has a heat exchange medium inlet and a heat exchange medium outlet.

5. A continuous production apparatus for chemical products according to claim 1, characterized in that, The tubular reactor (21) has a hollow discharge element (217) inside its shell (211) that is connected to the feed inlet and / or return inlet on the shell (211). The hollow discharge element (217) has a plurality of discharge holes (218).

6. A continuous production apparatus for chemical products according to claim 5, characterized in that, The hollow feeding element (217) is a U-shaped feeding tube, a V-shaped feeding tube, a serpentine feeding tube, an elliptical feeding tube, a rhomboid feeding tube, or a circular feeding tube.

7. A continuous production apparatus for chemical products according to claim 1, characterized in that, The stirring shaft (212) of the tubular reactor (21) extends out of the shell (211) and is connected to a drive motor (216). The drive motor (216) is fixed on the shell (211) of the tubular reactor (21). A drive gear is sleeved on the output shaft of the drive motor (216), and a driven gear that meshes with the drive gear is sleeved on the stirring shaft (212) of the tubular reactor (21).

8. A continuous production apparatus for chemical products according to claim 1, characterized in that, The batching unit (1) further includes a batching tank (12) and / or a mixer (13); the outlet of the batching tank (12) is connected to the inlet of the conveying pump (11), the inlet of the mixer (13) is connected to the outlet of the conveying pump (11), and the outlet of the mixer (13) is connected to the inlet of the tubular reactor (21).

9. A continuous production apparatus for chemical products according to claim 1, characterized in that, It also includes an aging unit (3) and / or a post-processing unit (4), wherein the inlet of the aging unit (3) is connected to the outlet pipe (24) of the circulating reaction unit, and the inlet of the post-processing unit (4) is connected to the outlet pipe (24) of the circulating reaction unit or the outlet of the aging unit (3). The aging unit (3) is an aging reactor (31); The post-processing unit (4) includes one or more of the following: heat exchange unit, separation unit, distillation unit, and drying unit.

10. A continuous production apparatus for chemical products according to any one of claims 1-9, characterized in that, The cyclic reaction unit (2) is provided with at least one stage. When the cyclic reaction unit (2) is provided with two or more stages, the multi-stage cyclic reaction units (2) are provided in series or in parallel.

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