Transesterification reaction device

Abstract

The utility model belongs to the technical field of polyester synthesis, and particularly relates to an ester exchange reaction device which comprises a kettle body, the gas phase pipe is vertically arranged at the top of the kettle body; the plurality of spraying mechanisms are vertically arranged in the gas phase pipe at intervals; the stirrer interface is arranged at the top of the kettle body; the first flushing pipe is arranged at the top of the kettle body and located beside the stirrer connector, and the output end of the first flushing pipe extends into the kettle body and then inclines towards the side close to the stirrer connector. According to the utility model, hot EG can be continuously sprayed to wash DMT solids accumulated on the inner wall of the gas phase pipe, so that the condition that the gas phase pipe is blocked is avoided, continuous reaction is guaranteed, gradient cleaning coverage is formed, and the energy consumption and material consumption caused by DMT escape are effectively reduced; eG can be flushed in a dead angle area, so that DMT is prevented from being accumulated in the dead angle area; therefore, the reaction efficiency is improved, the reaction is fully carried out, and the stable product quality is ensured.

Description

Technical Field

[0001] This utility model belongs to the field of polyester synthesis technology, specifically relating to an ester exchange reaction device. Background Technology

[0002] Plastic waste is a major component of solid waste. Statistics show that the global annual production of plastic packaging reaches 130 million tons, of which 50% are single-use items, accounting for approximately 36% of total plastic production. However, in terms of plastic waste disposal, 79% of recycled plastic waste is landfilled or dumped directly into the sea, with only 9% being recycled.

[0003] However, due to the unique structural properties of plastics, they are difficult to degrade in nature. Therefore, with the large-scale production and use of plastics, the problem of "white pollution" has gradually become prominent, posing a significant threat to the natural environment. Consequently, against the backdrop of the global push for "carbon neutrality," many countries and regions have introduced regulations to address plastic pollution, specifying clear requirements for the content of recycled plastics in plastic products. This makes recycled plastics a new development direction for the polyester industry.

[0004] The recycling process for polyester is mainly divided into two types: physical method and chemical method.

[0005] The physical method involves collecting and sorting waste polyester (mainly PET bottles), then processing it through impurity removal, washing, crushing, secondary washing, drying, melting, and pelletizing to ultimately obtain recycled PET particles. This method has advantages such as not introducing new chemical raw materials, no chemical reactions, a short process, and process safety; however, it also has significant limitations. It has high requirements for recycled materials (basically only for PET bottles), and the performance of the product tends to decline noticeably with increasing recycling frequency.

[0006] The mainstream chemical method involves using methanol and a catalyst to alcoholyze PET into dimethyl terephthalate (DMT) and ethylene glycol (EG). These are then purified to obtain pure DMT and EG. Subsequently, DMT and EG undergo transesterification, polymerization, and pelletizing to regenerate PET particles. The methanol produced during transesterification can be recycled back into the alcoholysis process, achieving recycling. This method boasts advantages such as mature technology, minimal consumption of chemical raw materials, and the ability to produce recycled PET products with performance almost identical to virgin PET.

[0007] In the aforementioned chemical-based recycled polyester process, the transesterification reaction of DMT and EG to produce polyethylene terephthalate (BHET) and methanol under the action of a catalyst is a crucial step, requiring a dedicated transesterification unit in industrial production. However, existing PET esterification reactors are not suitable for the transesterification reaction of recycled PET, specifically in the following aspects:

[0008] Virgin PET is produced by esterification of terephthalic acid (PTA) and ethylene glycol (EG) to form BHET and water; PTA is solid at room temperature, begins to sublimate above 300°C, and has a melting point of 427°C.

[0009] Recycled PET is produced by reacting dimethyl phthalate (DMT) and ethylene glycol (EG) to form BHET and methanol. DMT is a colorless crystal at room temperature, but it begins to sublimate at 140-150°C, with a melting point of 140.6°C.

[0010] This shows that the sublimation temperature of DMT is much lower than that of PTA, which makes DMT more likely to sublimate during the reaction.

[0011] If a conventional PET esterification reactor is directly applied to the transesterification reaction of recycled PET, DMT will sublimate in large quantities during the reaction due to its low sublimation temperature. Sublimated DMT condenses in the vapor phase tube, frequently causing blockages and affecting the continuous operation of the reaction. Simultaneously, DMT escape increases energy and material consumption, raising production costs. Furthermore, the condensed DMT accumulates in dead zones of the reactor, reducing reaction efficiency, preventing complete reaction, and leading to unstable product quality.

[0012] In summary, existing PET esterification reactors cannot meet the requirements of transesterification reactions in recycled PET. There is an urgent need to develop a reactor suitable for transesterification reactions in recycled PET to solve the many problems caused by DMT sublimation and improve the production efficiency and product quality of recycled polyester. Utility Model Content

[0013] The purpose of this invention is to provide an ester exchange reaction device that solves the technical problems of easy blockage of the gas phase tube, high production cost, low reaction efficiency and unstable product quality caused by DMT sublimation.

[0014] This utility model discloses an ester exchange reaction apparatus, comprising:

[0015] The vessel body;

[0016] A gas phase tube is arranged vertically and located at the top of the vessel body;

[0017] Several spraying mechanisms are vertically spaced within the gas phase pipe;

[0018] The stirrer interface is located at the top of the vessel body;

[0019] The first flushing pipe is located at the top of the vessel body and next to the stirrer interface, with its output end extending into the vessel body and then tilted towards the side closer to the stirrer interface.

[0020] This application utilizes a series of vertically spaced spray mechanisms within the gas phase tube to continuously spray hot EG to wash away DMT solids accumulated on the inner wall of the gas phase tube. This prevents blockage of the gas phase tube, ensures continuous reaction, and creates a gradient cleaning coverage, effectively reducing energy and material consumption caused by DMT escape. Furthermore, by installing a first flushing pipe next to the stirrer interface, EG can be flushed from dead-angle areas, preventing DMT accumulation in these areas. These features improve reaction efficiency, ensure thorough reaction, and guarantee stable product quality.

[0021] Based on the above technical solution, the solution of this application can be further improved as follows:

[0022] Preferably, it includes:

[0023] The level gauge interface is located at the top of the vessel body;

[0024] The second flushing tube is located at the top of the vessel and next to the level gauge interface. Its output end extends into the vessel and is tilted towards the side closest to the level gauge interface. This design facilitates the installation of the level gauge, enabling real-time monitoring of the liquid level. It also avoids the accumulation of DMT in the dead zone area formed by the installation of the level gauge, thus improving the stability of the transesterification reaction.

[0025] Preferably, it includes:

[0026] A jacket is provided on the outside of the vessel body, forming a first interlayer space between the jacket and the vessel body. This solution allows for uniform and stable heating of the vessel body, thereby meeting the temperature requirements of the transesterification reaction and ensuring that the reaction can proceed stably and continuously.

[0027] Preferably, the jacket comprises:

[0028] A reinforcing ring is fitted around the outer periphery of the vessel body;

[0029] The upper end cap is located on the top surface of the reinforcing ring and covers the outside of the vessel body;

[0030] The outer cylinder is located on the bottom surface of the reinforcing ring and is sleeved on the outside of the vessel.

[0031] A gas phase inlet pipe is located at the top of the upper end cap and communicates with the first interlayer space;

[0032] The first condensate outlet pipe is located at the bottom end of the upper end cap and communicates with the first interlayer space; this solution enhances the pressure-bearing capacity, improves the structural stability, and strengthens the heating effect.

[0033] Preferably, it includes:

[0034] An outer sleeve is provided on the outside of the jacket and sleeved on the outside of the gas phase pipe, forming a second interlayer space between the outer sleeve and the gas phase pipe;

[0035] The second condensate outlet pipe is located at the bottom end of the outer sleeve and communicates with the second interlayer space. This solution avoids the problem of methanol vapor liquefying and condensing due to temperature drop during transportation, which then falls back into the air. It also ensures that the outer wall of the vapor phase pipe is heated evenly, avoiding the risk of thermal stress or condensation caused by local temperature differences.

[0036] Preferably, the spraying mechanism includes:

[0037] The outer protective tube has one end connected to the gas phase tube and the other end extending out to the outer sleeve tube;

[0038] The delivery pipe extends from the outer protective pipe into the gas phase pipe at its output end.

[0039] The spray head is installed at the output end of the delivery pipe;

[0040] The sealing cap is fixedly sleeved on the delivery pipe and can be detachably installed on the end of the outer protective pipe located outside the outer sleeve. This solution facilitates installation, disassembly, and maintenance, ensures the sealing effect of the gas phase pipe and the second interlayer space, and has a simple structure and stable support.

[0041] Preferably, it includes:

[0042] A transfer sleeve is provided at the top of the jacket and is fitted outside the liquid level gauge interface, forming an annular cavity between the transfer sleeve and the liquid level gauge interface, and the annular cavity is connected to the first interlayer space.

[0043] A degassing pipe is located outside the transfer sleeve and communicates with the annular cavity. This design can both discharge the cooled steam in the first interlayer space and heat the outer wall of the level gauge interface through the annular cavity, thereby avoiding the accumulation of DMT caused by the temperature drop of the inner wall of the level gauge interface and improving the reaction stability.

[0044] Preferably, there are two spraying mechanisms, which are respectively arranged on the upper and lower sides inside the gas phase pipe; by adopting this solution, the DMT escape rate is effectively reduced and the manufacturing cost is reduced.

[0045] Through the above technical solution, this utility model achieves the following beneficial effects:

[0046] 1. This application utilizes a series of vertically spaced spray mechanisms within the gas phase tube to continuously spray hot EG to wash away the DMT solids accumulated on the inner wall of the gas phase tube. This prevents blockage of the gas phase tube, ensures continuous reaction, and creates a gradient cleaning coverage, effectively reducing energy and material consumption caused by DMT escape. Furthermore, by installing a first flushing pipe next to the stirrer interface, EG can be flushed from dead corner areas, preventing DMT accumulation in these areas. This improves reaction efficiency, ensures a complete reaction, and guarantees stable product quality.

[0047] 2. This application facilitates the installation of the level gauge by setting up a level gauge interface and a second flushing pipe, thereby enabling real-time monitoring of the liquid level and avoiding the accumulation of DMT in the dead zone area formed by the installation of the level gauge, thus improving the stability of the transesterification reaction. Attached Figure Description

[0048] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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 from these drawings without creative effort.

[0049] Figure 1 This is a cross-sectional view of the upper half of the transesterification reactor described in a specific embodiment of this application;

[0050] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0051] Figure 3 for Figure 1 Enlarged view of point B in the middle;

[0052] Figure 4 for Figure 1 Enlarged view of point C in the middle;

[0053] Explanation of reference numerals in the attached figures:

[0054] 1. Reactor body; 2. Vapor phase pipe; 3. Spraying mechanism; 4. Stirrer interface; 5. First flushing pipe; 6. Level gauge interface; 7. Second flushing pipe; 8. Jacket; 9. Outer jacket; 10. Second condensate outlet pipe; 11. Transfer sleeve; 12. Degassing pipe;

[0055] 31. Outer protective pipe; 32. Conveying pipe; 33. Spray head; 34. Sealing cap; 81. Reinforcing ring; 82. Upper end cap; 83. Outer cylinder; 84. Gas phase inlet pipe; 85. First condensate outlet pipe;

[0056] 801, First interlayer space; 901, Second interlayer space; 1101, Annular cavity. Detailed Implementation

[0057] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0058] First, it should be noted that some directional terms used in the following description to clearly illustrate the technical solution of this utility model, such as the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," are all derived from the normal orientation of the components in the transesterification reactor. They are only used to facilitate the description of this utility model and simplify the description, and do not indicate or imply that the device or component 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.

[0059] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features.

[0060] In this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] To better understand the above technical solutions, the following will provide a detailed description of the technical solutions in conjunction with the accompanying drawings and specific embodiments.

[0062] Example:

[0063] like Figures 1-4 As shown in the embodiment of this application, a transesterification reaction device is disclosed for the transesterification reaction of dimethyl terephthalate (DMT) and ethylene glycol (EG) to generate ethylene terephthalate (BHET) and methanol under the action of a catalyst. It solves the technical problems of easy clogging of the gas phase pipe 2, high production cost, low reaction efficiency and unstable product quality caused by DMT sublimation. Its specific structure includes: a vessel body 1, a gas phase pipe 2, several spray mechanisms 3, a stirrer interface 4 and a first flushing pipe 5.

[0064] The vessel 1 is the reaction vessel, which carries out the transesterification reaction of DMT and EG.

[0065] The gas phase tube 2 is arranged vertically and located at the top of the vessel body 1. It is used to discharge the methanol in the gas phase, thereby promoting the forward progress of the transesterification reaction. Gravity can be used to promote the sedimentation of DMT sublimation products, thereby reducing the adhesion to the inner wall of the gas phase tube 2.

[0066] Several spraying mechanisms 3 are vertically spaced inside the gas phase pipe 2 to continuously spray hot EG, thereby washing away the DMT solids accumulated on the inner wall of the gas phase pipe 2 and forming a gradient cleaning coverage, which effectively reduces DMT escape.

[0067] The stirrer interface 4 is located at the top of the vessel body 1, which facilitates the installation and arrangement of the stirrer.

[0068] The first flushing pipe 5 is located at the top of the vessel body 1 and next to the stirrer interface 4. Its output end extends into the vessel body 1 and is inclined towards the side closer to the stirrer interface 4. It is used to flush the EG in the dead corner area formed by the stirrer installation, thereby preventing DMT from accumulating in the dead corner area.

[0069] This invention utilizes a series of vertically spaced spray mechanisms 3 within the gas phase tube 2 to continuously spray hot EG to wash away the DMT solids accumulated on the inner wall of the gas phase tube 2. This prevents the gas phase tube 2 from becoming blocked, ensuring the continuous progress of the reaction and creating a gradient cleaning coverage, effectively reducing energy and material consumption caused by DMT escape. Furthermore, by providing a first flushing pipe 5 beside the stirrer interface 4, EG can be flushed from dead corner areas, preventing DMT accumulation in these areas. This improves reaction efficiency, ensures a complete reaction, and guarantees stable product quality.

[0070] In some embodiments, such as Figure 1 and Figure 4 As shown, it includes: a level gauge interface 6 and a second flushing pipe 7, which are configured as follows:

[0071] The level gauge interface 6 is located at the top of the vessel body 1 and is used to install a level gauge so as to monitor the level of the EG / DMT mixture in the vessel body 1 in real time.

[0072] The second flushing pipe 7 is located at the top of the vessel body 1 and next to the level gauge interface 6. Its output end extends into the vessel body 1 and is inclined towards the side closer to the level gauge interface 6. It is used to flush the dead corner area formed by the installation of the level gauge, thereby preventing DMT from accumulating in the dead corner area.

[0073] Specifically, a flange is provided at the top of the level gauge interface 6, which facilitates the disassembly and assembly of the level gauge and ensures the sealing effect inside the vessel body 1.

[0074] By setting up the level gauge interface 6 and the second flushing pipe 7, it is easy to install the level gauge, thereby enabling real-time monitoring of the liquid level and avoiding the accumulation of DMT in the dead zone area formed by the installation of the level gauge, thus improving the stability of the transesterification reaction.

[0075] In some embodiments, such as Figure 1 and Figure 4 As shown, it includes: a jacket 8, which is located on the outside of the vessel body 1 and forms a first interlayer space 801 between the jacket and the vessel body 1 for introducing a heat carrier (such as heat transfer oil or steam).

[0076] By setting up the jacket 8, the vessel body 1 can be heated uniformly and stably, thereby meeting the temperature requirements of the transesterification reaction and ensuring that the reaction can proceed stably and continuously.

[0077] Based on the above embodiments, such as Figure 1 and Figure 3 As shown, the jacket 8 includes: a reinforcing ring 81, an upper end cap 82, an outer cylinder 83, a gas phase inlet pipe 84, and a first condensate outlet pipe 85, configured as follows:

[0078] 81 reinforcing rings are installed around the outer periphery of the vessel body 1;

[0079] The upper end cap 82 is located on the top surface of the reinforcing ring 81 and covers the outside of the vessel body 1;

[0080] The outer cylinder 83 is located on the bottom surface of the reinforcing ring 81 and is sleeved on the outside of the vessel body 1;

[0081] The gas inlet pipe 84 is located at the top of the upper end cap 82 and is connected to the first interlayer space 801;

[0082] The first condensate outlet pipe 85 is located at the bottom end of the upper end cap 82 and is connected to the first interlayer space 801.

[0083] Specifically, the reinforcing ring 81 strengthens the pressure-bearing capacity of the vessel body 1 and the jacket 8, preventing deformation; it also separates the first interlayer space 801, allowing for the separate supply of heat medium, thereby improving the heating effect; and it also supports the upper end cap 82 and the outer cylinder 83, ensuring structural stability.

[0084] During heating, steam enters the upper first interlayer space 801 through the gas phase inlet pipe 84, thereby heating the upper end of the vessel body 1. After the steam cools down, the condensate produced is discharged through the first condensate outlet pipe 85.

[0085] The aforementioned further design of the jacket 8 enhances its pressure-bearing capacity, improves its structural stability, and strengthens its heating effect.

[0086] Based on the above embodiments, such as Figure 1 and Figure 2As shown, it includes: an outer casing 9 and a second condensate outlet pipe 10, which are configured as follows:

[0087] The outer sleeve 9 is located outside the jacket 8 and is fitted over the gas phase pipe 2, forming a second interlayer space 901 between it and the gas phase pipe 2. This second interlayer space 901 is used to input steam, thereby preventing methanol from liquefying and condensing due to temperature drop.

[0088] The second condensate outlet pipe 10 is located at the bottom end of the outer casing pipe 9 and is connected to the second interlayer space 901, used to discharge the condensate generated after steam cooling.

[0089] Preferably, the gas phase pipe 2 and the outer casing 9 can be of a separate structure, which reduces the height of the device during transportation, reduces the difficulty of transportation, and can be welded and fixed after transportation to the site.

[0090] The above settings avoid the problem of methanol vapor liquefying and condensing due to temperature drop during transportation, which would then fall back and ensure that the outer wall of the vapor phase pipe 2 is heated evenly, thus avoiding the risk of thermal stress or condensation caused by local temperature differences.

[0091] In this embodiment, as Figure 1 and Figure 2 As shown, the spraying mechanism 3 includes: an outer protective pipe 31, a conveying pipe 32, a spray head 33, and a sealing cover 34, which are configured as follows:

[0092] One end of the outer protective tube 31 is connected to the gas phase tube 2, and the other end extends out to the outer sleeve 9, so that the inside of the gas phase tube 2 can communicate with the outside and ensure the sealing of the second interlayer space 901.

[0093] The output end of the delivery pipe 32 passes through the outer protective pipe 31 and extends into the gas phase pipe 2 to deliver heat EG to the inside of the gas phase pipe 2.

[0094] Spray head 33 is installed at the output end of delivery pipe 32 to atomize hot EG, thereby ensuring that it can uniformly cover the pipe wall of gas phase pipe 2;

[0095] The sealing cap 34 is fixedly sleeved on the conveying pipe 32 and can be detachably installed on the end of the outer protective pipe 31 located outside the outer sleeve 9. It is used to provide support for the conveying pipe 32, ensure the sealing of the gas phase pipe 2, and facilitate the removal of the spray head 33 for maintenance.

[0096] Specifically, the outer protective tube 31 and the sealing cover 34 are bolted together by a flange, which ensures the sealing performance and facilitates disassembly and assembly; and the sealing cover 34 is equipped with a handle, which makes it easy for maintenance personnel to operate.

[0097] The above-mentioned further design of the spray mechanism 3 facilitates installation, disassembly, inspection and maintenance, and ensures the sealing effect of the gas phase pipe 2 and the second interlayer space 901. The structure is simple and the support is stable.

[0098] In this embodiment, as Figure 4 As shown, it includes: a transfer sleeve 11 and a degassing pipe 12, which are configured as follows:

[0099] The transfer sleeve 11 is located on the top of the jacket 8 and is fitted outside the level gauge interface 6. An annular cavity 1101 is formed between the transfer sleeve 11 and the level gauge interface 6. The annular cavity 1101 is connected to the first interlayer space 801.

[0100] The degassing pipe 12 is located outside the intermediate sleeve 11 and is connected to the annular cavity 1101 to discharge the cooled steam in the first interlayer space 801.

[0101] With the above configuration, the cooled steam in the first interlayer space 801 can be discharged, and the outer wall of the level gauge interface 6 can be heated by the annular cavity 1101, thereby avoiding the situation where the inner wall temperature of the level gauge interface 6 drops and DMT accumulates, thus improving the reaction stability.

[0102] In some embodiments, there are two spray mechanisms 3, which are respectively arranged on the upper and lower sides inside the gas phase pipe 2, which effectively reduces DMT escape and reduces manufacturing costs.

[0103] Numerous specific details are set forth in this specification. However, it will be understood that embodiments of this invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0104] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A transesterification apparatus, characterized in that, include: The vessel body; A gas phase tube is arranged vertically and located at the top of the vessel body; Several spraying mechanisms are vertically spaced within the gas phase pipe; The stirrer interface is located at the top of the vessel body; The first flushing pipe is located at the top of the vessel body and next to the stirrer interface, with its output end extending into the vessel body and then tilted towards the side closer to the stirrer interface.

2. The transesterification apparatus according to claim 1, characterized in that, include: The level gauge interface is located at the top of the vessel body; The second flushing pipe is located at the top of the vessel body and next to the level gauge interface, with its output end extending into the vessel body and tilted towards the side closer to the level gauge interface.

3. The transesterification apparatus according to claim 2, characterized in that, include: A jacket is provided on the outside of the vessel body, forming a first interlayer space between the jacket and the vessel body.

4. The transesterification apparatus according to claim 3, characterized in that, The jacket includes: A reinforcing ring is fitted around the outer periphery of the vessel body; The upper end cap is located on the top surface of the reinforcing ring and covers the outside of the vessel body; The outer cylinder is located on the bottom surface of the reinforcing ring and is sleeved on the outside of the vessel. A gas phase inlet pipe is located at the top of the upper end cap and communicates with the first interlayer space; The first condensate outlet pipe is located at the bottom end of the upper end cap and communicates with the first interlayer space.

5. The transesterification apparatus according to claim 3, characterized in that, include: An outer sleeve is provided on the outside of the jacket and sleeved on the outside of the gas phase pipe, forming a second interlayer space between the outer sleeve and the gas phase pipe; The second condensate outlet pipe is located at the bottom end of the outer sleeve and communicates with the second interlayer space.

6. The transesterification apparatus according to claim 5, characterized in that, The spraying mechanism includes: The outer protective tube has one end connected to the gas phase tube and the other end extending out to the outer sleeve tube; The delivery pipe extends from the outer protective pipe into the gas phase pipe at its output end. The spray head is installed at the output end of the delivery pipe; A sealing cap is fixedly fitted onto the conveying pipe and can be detachably installed on the end of the outer protective pipe located outside the outer sleeve.

7. The transesterification apparatus according to claim 3, characterized in that, include: A transfer sleeve is provided at the top of the jacket and is fitted outside the liquid level gauge interface, forming an annular cavity between the transfer sleeve and the liquid level gauge interface, and the annular cavity is connected to the first interlayer space. The degassing pipe is located outside the transfer sleeve and communicates with the annular cavity.

8. The transesterification apparatus according to claim 1, characterized in that, The spraying mechanism has two parts, which are respectively arranged on the upper and lower sides inside the gas phase pipe.

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