Chlorine introducing device for chloroethylene carbonate production

Abstract

The utility model provides a chlorine introducing device for chloroethylene carbonate production. The chlorine introducing device comprises a first reaction kettle, a second reaction kettle, a third reaction kettle and a chlorine main pipe, the bottom of the first reaction kettle is communicated with a chlorine main pipe through a first chlorine conveying pipe, the other end of the first chlorine conveying pipe is communicated with a first aeration unit, the first aeration unit is located at the bottom in the first reaction kettle, and the bottom of the second reaction kettle is communicated with the chlorine main pipe through a second chlorine conveying pipe. The other end of the second chlorine conveying pipe is communicated with a second aeration unit; the second aeration unit is positioned at the inner bottom of the second reaction kettle; the top of the first reaction kettle is connected with a first exhaust pipe, the top of the second reaction kettle is connected with a second exhaust pipe, the first exhaust pipe and the second exhaust pipe are connected with a third aeration unit in the third reaction kettle through a chlorine recycling pipe, and a third air blower is arranged on the chlorine recycling pipe. According to the invention, the production of chloroethylene carbonate is realized, and meanwhile, the utilization rate of chlorine is increased.

Description

Technical Field

[0001] This application relates to the technical field of chlorination reactions, and particularly to a chlorine feeding device for the production of ethylene carbonate chloride. Background Art

[0002] Ethylene carbonate chloride is an organic compound used as an intermediate in organic synthesis and is also an important additive material for lithium battery electrolytes. It can form a dense and stable organic film on the battery surface, improve the stability of the graphite negative electrode, and thus improve the charge and discharge performance of lithium batteries. With the increasing requirements for energy conservation and environmental protection, the new energy industry has developed rapidly. As an important part of the new energy industry, the development of lithium batteries has received extensive attention and research. Therefore, the demand for ethylene carbonate chloride has gradually increased.

[0003] However, in the production of ethylene carbonate chloride, ethylene carbonate is usually used as the raw material and chlorine gas as the chlorinating agent to react to produce ethylene carbonate chloride. However, during the reaction process, it is necessary to continuously maintain a relatively high flow rate of the chlorine gas stream to promote the normal progress of the chlorination reaction and avoid side reactions. The increase in the flow rate results in a short residence time of the chlorine gas in the reaction kettle, resulting in a low utilization rate of chlorine gas (only about 80%), causing waste of chlorine gas, and further leading to a large pressure in the tail gas system and increasing costs, which is not conducive to economic production. Utility Model Content

[0004] This application provides a chlorine feeding device for the production of ethylene carbonate chloride to solve the above problems mentioned in the background art.

[0005] This application provides a chlorine feeding device for the production of ethylene carbonate chloride, including: a first reaction kettle, a second reaction kettle, a third reaction kettle, and a chlorine gas main pipe;

[0006] The bottom of the first reaction kettle is connected to the chlorine gas main pipe through a first chlorine gas delivery pipe. The end of the first chlorine gas delivery pipe far from the chlorine gas main pipe is connected to a first aeration unit, and the first aeration unit is located at the inner bottom of the first reaction kettle. The bottom of the second reaction kettle is connected to the chlorine gas main pipe through a second chlorine gas delivery pipe. The end of the second chlorine gas delivery pipe far from the chlorine gas main pipe is connected to a second aeration unit, and the second aeration unit is located at the inner bottom of the second reaction kettle;

[0007] The top of the first reaction kettle is connected to a first exhaust pipe, the top of the second reaction kettle is connected to a second exhaust pipe, both the first exhaust pipe and the second exhaust pipe are connected to a third aeration unit through a chlorine gas recycling pipe, the third aeration unit is arranged at the inner bottom of the third reaction kettle, and a third blower is arranged on the chlorine gas recycling pipe. The top of the third reaction kettle is connected to a tail gas pipe.

[0008] Optionally, the chlorine gas recycling pipe is also connected to the chlorine gas main pipe through a third chlorine gas delivery pipe, and a solenoid valve is arranged on the third chlorine gas delivery pipe.

[0009] Optionally, a Venturi tube is connected between the third blower and the third aeration unit. The positive pressure inlet of the Venturi tube is connected to the output end of the third blower, the negative pressure inlet of the Venturi tube is communicated with the third chlorine delivery pipe, and the diffuser section outlet of the Venturi tube is connected to the third aeration unit.

[0010] Optionally, a first pressure sensor is arranged in the first reaction kettle, a second pressure sensor is arranged in the second reaction kettle, and a third pressure sensor is arranged in the third reaction kettle.

[0011] Optionally, a first chlorine recycling valve is arranged on the first exhaust pipe, and a second chlorine recycling valve is arranged on the second exhaust pipe.

[0012] Optionally, the first aeration unit, the second aeration unit and the third aeration unit have the same structure, including an aeration pipe and aeration holes opened on the aeration pipe.

[0013] The aeration pipe of the first aeration unit is communicated with the first chlorine delivery pipe, the aeration pipe of the second aeration unit is communicated with the second chlorine delivery pipe, and the aeration pipe of the third aeration unit is communicated with the diffuser section outlet of the Venturi tube.

[0014] Optionally, a spiral guide plate is fixedly connected above the aeration holes.

[0015] The chlorine feeding device for the production of ethylene carbonate chloride provided by the present application realizes the production of ethylene carbonate chloride and improves the utilization rate of chlorine. Compared with the prior art, it has the following beneficial effects:

[0016] (1) Chlorine is transported into the first reaction kettle and the second reaction kettle through the main chlorine pipe. The raw material ethylene carbonate and chlorine react in the reaction kettle under the action of an ultraviolet photoinitiator to achieve the purpose of producing ethylene carbonate chloride. The tail gas containing chlorine generated in the first reaction kettle and the second reaction kettle is input into the third reaction kettle from the bottom of the third reaction kettle through the chlorine recycling pipe to continue participating in the chlorination reaction, which prolongs the contact time between chlorine and ethylene carbonate, recovers and reuses the tail gas containing chlorine, and improves the utilization rate of chlorine. At the same time, compared with the prior art, the present application uses three reaction kettles in combination. Under the same chlorine consumption, the device provided by the present application helps the full reaction of chlorine and ethylene carbonate, which is beneficial to improving the yield and output of ethylene carbonate chloride. The tail gas generated during the reaction process of the third reaction kettle is transported to the tail gas treatment device through the tail gas pipe, and the chlorine content in the tail gas is greatly reduced, reducing the tail gas treatment load and the tail gas treatment cost. At the same time, after passing through the aeration unit, chlorine reacts with the raw material ethylene carbonate, increasing the contact area between chlorine and ethylene carbonate. At the same time, the setting of the aeration unit can stir the reaction liquid in the reaction kettle, improving the chlorination reaction efficiency.

[0017] (2) The first reaction kettle and the second reaction kettle continuously feed the tail gas containing chlorine into the third reaction kettle, and at the same time, the third chlorine delivery pipe feeds pure chlorine into the third reaction kettle. The Venturi tube is arranged between the third blower and the third aeration unit, and can mix the chlorine and the tail gas containing chlorine entering the third reaction kettle before feeding them in, so that the mass distribution of the chlorine entering the third reaction kettle is uniform, which is conducive to the synchronous progress of the chlorination reaction at various positions in the third reaction kettle. This can avoid the uneven distribution of chlorine entering the third reaction kettle, which may lead to a relatively fast local reaction rate, resulting in a local temperature increase and thus being unfavorable to the stable operation of the overall reaction device.

[0018] (3) The chlorine feeding device for producing ethylene carbonate chloride provided by this application improves the reaction speed, reduces the amount of tail gas treatment, and further improves the production efficiency of the ethylene carbonate chloride product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of the chlorine feeding device for producing ethylene carbonate chloride provided by an embodiment of this application;

[0021] Figure 2 It is a schematic structural diagram of the chlorine feeding device for producing ethylene carbonate chloride provided by another embodiment of this application;

[0022] Figure 3 It is a schematic connection diagram of the Venturi tube provided by an embodiment of this application;

[0023] Figure 4 It is a schematic structural diagram of the aeration unit provided by an embodiment of this application;

[0024] Figure 5 It is a schematic structural diagram of the aeration unit provided by another embodiment of this application;

[0025] DESCRIPTION OF THE REFERENCE NUMERALS:

[0026] 1: First reactor, 2: Second reactor, 3: Third reactor, 4: Main chlorine pipe, 5: Venturi tube, 110: First exhaust pipe, 111: First chlorine recycling valve, 120: First pressure sensor, 210: Second exhaust pipe, 211: Second chlorine recycling valve, 220: Second pressure sensor, 310: Chlorine recycling pipe, 320: Third blower, 330: Tail gas pipe, 340: Third chlorine delivery pipe, 341: Solenoid valve, 350: Third pressure sensor, 410: First chlorine delivery pipe, 420: Second chlorine delivery pipe, 510: Positive pressure inlet, 520: Negative pressure inlet, 530: Diffusion section outlet, 610: Aeration pipe, 620: Aeration hole, 630: Spiral guide plate. Detailed implementation mode

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts also belong to the scope of protection of this application.

[0028] As Figure 1 shown, this application provides a chlorine feeding device for the production of ethylene carbonate chloride, including: a first reactor 1, a second reactor 2, a third reactor 3, and a main chlorine pipe 4;

[0029] The bottom of the first reactor 1 is connected to the main chlorine pipe 4 through the first chlorine delivery pipe 410. The end of the first chlorine delivery pipe 410 far from the main chlorine pipe 4 is connected to the first aeration unit, and the first aeration unit is located at the inner bottom of the first reactor 1. The bottom of the second reactor 2 is connected to the main chlorine pipe 4 through the second chlorine delivery pipe 420. The end of the second chlorine delivery pipe 420 far from the main chlorine pipe 4 is connected to the second aeration unit, and the second aeration unit is located at the inner bottom of the second reactor 2;

[0030] The top of the first reactor 1 is connected with a first exhaust pipe 110, and the top of the second reactor 2 is connected with a second exhaust pipe 210. Both the first exhaust pipe 110 and the second exhaust pipe 210 are connected to the third aeration unit through the chlorine recycling pipe 310. The third aeration unit is arranged at the inner bottom of the third reactor 3. A third blower 320 is arranged on the chlorine recycling pipe 310. The top of the third reactor 3 is connected with a tail gas pipe 330.

[0031] Specifically, the first reaction kettle 1, the second reaction kettle 2, and the third reaction kettle 3 are all used for the preparation and production of ethylene carbonate chloride. The inlet end of the main chlorine pipeline 4 is connected to the chlorine station for transporting chlorine into the reaction kettle. The raw materials, ethylene carbonate and chlorine, are transported into the reaction kettle, and under the action of an ultraviolet light initiator, a chlorination reaction occurs to produce ethylene carbonate chloride. The chlorine feeding device for the production of ethylene carbonate chloride provided in this application transports the remaining unreacted chlorine in the first reaction kettle 1 and the second reaction kettle 2 into the third reaction kettle 3 to continue participating in the reaction. By using three reaction kettles in a group, the utilization rate of chlorine is improved, chlorine waste is reduced, and at the same time, the amount of tail gas treatment is greatly reduced, having good economic and environmental benefits.

[0032] It is connected to the main chlorine pipeline 4 through the first chlorine delivery pipe 410 to provide chlorine for the first reaction kettle 1, and is connected to the main chlorine pipeline 4 through the second chlorine delivery pipe 420 to provide chlorine for the second reaction kettle 2. A chlorination reaction occurs in the first reaction kettle 1 and the second reaction kettle 2 to produce ethylene carbonate chloride. During the reaction process, since chlorine is continuously introduced, there is unreacted chlorine in the first reaction kettle 1 and the second reaction kettle 2. If this chlorine is directly discharged and enters the tail gas treatment device, it will increase the operating load of the tail gas treatment device, cause chlorine waste at the same time, and reduce the utilization rate of chlorine.

[0033] The top of the first reaction kettle 1 is connected with a first exhaust pipe 110, and the top of the second reaction kettle 2 is connected with a second exhaust pipe 210. The tail gas containing chlorine generated in the first reaction kettle 1 and the second reaction kettle 2 respectively enters the third reaction kettle 3 through the first exhaust pipe 110 and the second exhaust pipe 210 via the chlorine reuse pipe 310 at the bottom of the third reaction kettle 3 to continue participating in the chlorination reaction. In this way, the contact time between chlorine and ethylene carbonate is prolonged, the tail gas containing chlorine is recycled and reused, the utilization rate of chlorine is improved. At the same time, compared with the prior art, under the same chlorine usage, the device provided in this application helps the full reaction of chlorine and ethylene carbonate, which is conducive to improving the yield and output of ethylene carbonate chloride. The tail gas generated during the reaction process of the third reaction kettle 3 is transported to the tail gas treatment device through the tail gas pipe 330 at the top. At this time, the chlorine content in the tail gas is greatly reduced, reducing the tail gas treatment load and the tail gas treatment cost.

[0034] A first aeration unit is arranged at the bottom of the first reaction kettle 1, a second aeration unit is arranged at the bottom of the second reaction kettle 2, and a third aeration unit is arranged at the bottom of the third reaction kettle 3. This helps chlorine to contact and react with the raw material ethylene carbonate after passing through the aeration unit, increasing the contact area between chlorine and ethylene carbonate. At the same time, the setting of the aeration unit can stir the reaction liquid in the reaction kettle, improving the chlorination reaction efficiency.

[0035] Through the above solution, the present application realizes the production of vinyl chloroformate and improves the utilization rate of chlorine gas. Chlorine gas is transported into the first reaction kettle and the second reaction kettle through the main chlorine pipeline. The raw material ethylene carbonate and chlorine gas in the reaction kettle undergo a chlorination reaction under the action of an ultraviolet photoinitiator to achieve the purpose of producing vinyl chloroformate. The tail gas containing chlorine gas generated in the first reaction kettle and the second reaction kettle is respectively input into the third reaction kettle through the first exhaust pipe and the second exhaust pipe via the chlorine gas recycling pipe to continue to participate in the chlorination reaction at the bottom of the third reaction kettle. In this way, the contact time between chlorine gas and ethylene carbonate is extended, the tail gas containing chlorine gas is recycled and reused, and the utilization rate of chlorine gas is improved. At the same time, compared with the prior art, the present application uses three reaction kettles in a group for combined use. Under the same chlorine gas consumption, the device provided by the present application helps the full reaction of chlorine gas and ethylene carbonate, which is conducive to improving the yield and output of vinyl chloroformate. The tail gas generated during the reaction process of the third reaction kettle is transported to the tail gas treatment device through the tail gas pipeline at the top. At this time, the chlorine gas content in the tail gas is greatly reduced, reducing the tail gas treatment load and the tail gas treatment cost. At the same time, after passing through the aeration unit, chlorine gas contacts and reacts with the raw material ethylene carbonate, increasing the contact area between chlorine gas and ethylene carbonate. At the same time, the setting of the aeration unit can stir the reaction liquid in the reaction kettle, improving the chlorination reaction efficiency.

[0036] As Figure 2 shown, optionally, the chlorine gas recycling pipe 310 is also connected to the main chlorine pipeline 4 through a third chlorine gas transportation pipe 340, and a solenoid valve 341 is provided on the third chlorine gas transportation pipe 340.

[0037] Specifically, the third chlorine gas transportation pipe 340 is connected to the main chlorine pipeline 4 to supplement chlorine gas to the third reaction kettle 3, which is conducive to improving the chlorination reaction in the third reaction kettle 3. The solenoid valve 341 is used to control the start and stop of the chlorine gas entering the third reaction kettle 3.

[0038] As Figure 3 shown, optionally, a Venturi tube 5 is connected between the third blower 320 and the third aeration unit. The positive pressure inlet 510 of the Venturi tube 5 is connected to the output end of the third blower 320, the negative pressure inlet 520 of the Venturi tube 5 is connected to the third chlorine gas transportation pipe 340, and the diffuser section outlet 530 of the Venturi tube 5 is connected to the third aeration unit.

[0039] Specifically, the first reactor 1 and the second reactor 2 continuously feed the tail gas containing chlorine into the third reactor 3, and at the same time, the third chlorine delivery pipe 340 feeds pure chlorine into the third reactor 3, both of which are used for the chlorination reaction in the third reactor 3. The Venturi tube 5 is arranged between the third blower 320 and the third aeration unit, and can mix the chlorine gas and the tail gas containing chlorine entering the third reactor 3 and then feed them in, so that the mass distribution of the chlorine gas entering the third reactor 3 is uniform, which is conducive to the synchronous progress of the chlorination reaction at various positions in the third reactor 3. It is avoided that the uneven distribution of chlorine gas entering the third reactor 3 leads to a relatively fast local reaction rate, resulting in a local temperature increase, which is not conducive to the stable operation of the overall reaction device.

[0040] The positive pressure inlet 510 of the Venturi tube 5 is connected to the output end of the third blower 320. Under the power of the third blower 320, the tail gas containing chlorine is fed into the Venturi tube 5 under positive pressure. At the same time, a local negative pressure is formed inside the Venturi tube 5, and the chlorine gas in the third chlorine delivery pipe 340 is inhaled through the negative pressure inlet 520, mixed and accelerated, and finally enters the third reactor 3 through the diffusion section outlet 530 of the Venturi tube 5 via the third aeration unit to participate in the reaction.

[0041] As Figure 2 shown, optionally, a first pressure sensor 120 is arranged in the first reactor 1, a second pressure sensor 220 is arranged in the second reactor 2, and a third pressure sensor 350 is arranged in the third reactor 3.

[0042] Specifically, the first pressure sensor 120 is used to detect the pressure in the first reactor 1, the second pressure sensor 220 is used to detect the pressure in the second reactor 2, and the third pressure sensor 350 is used to detect the pressure in the third reactor 3. According to the pressure data detected by each pressure sensor, it is judged whether the pressure in the reactor exceeds the preset pressure. If the pressure is too high, the pressure is reduced by relieving pressure and reducing the chlorine input amount. If the pressure is too low, the chlorine inlet amount is increased to increase the reaction rate, and then the pressure is adjusted to reach the preset pressure.

[0043] Optionally, a first chlorine reuse valve 111 is arranged on the first exhaust pipe 110, and a second chlorine reuse valve 211 is arranged on the second exhaust pipe 210.

[0044] Specifically, both the first chlorine reuse valve 111 and the second chlorine reuse valve 211 are used to adjust the amount of the tail gas containing chlorine entering the third reactor 3, and the opening degrees of the first chlorine reuse valve 111 and the second chlorine reuse valve 211 are determined according to the detection data of the first pressure sensor 120, the second pressure sensor 220 and the third pressure sensor 350 in the actual working conditions, which is convenient for the adjustment of chlorine gas.

[0045] Among them, pressure relief means adjusting the opening degrees of the first chlorine recycling valve 111 and the second chlorine recycling valve 211, and the frequency of the negative pressure fan connected to the tail gas pipe 330 (not shown in the figure). Reducing the chlorine input amount means adjusting the frequency of the negative pressure fans connected to the first chlorine delivery pipe 410 and the second chlorine delivery pipe 420, and the frequency of the third blower 320.

[0046] As Figure 4 shown, optionally, the structures of the first aeration unit, the second aeration unit and the third aeration unit are the same, including an aeration pipe 610 and aeration holes 620 opened on the aeration pipe 610;

[0047] The aeration pipe 610 of the first aeration unit is communicated with the first chlorine delivery pipe 410, the aeration pipe 610 of the second aeration unit is communicated with the second chlorine delivery pipe 420, and the aeration pipe 610 of the third aeration unit is communicated with the diffusion section outlet 530 of the venturi tube 5.

[0048] Specifically, the chlorine in the first chlorine delivery pipe 410 and the second chlorine delivery pipe 420 and the mixed gas from the diffusion section outlet 530 of the venturi tube 5 enter the first reaction kettle 1, the second reaction kettle 2 and the third reaction kettle 3 through the aeration pipe 610 respectively, and are ejected through the aeration holes 620. The aeration unit increases the contact area between chlorine and ethylene carbonate. At the same time, the setting of the aeration unit can stir the reaction liquid in the reaction kettle, improving the efficiency of the chlorination reaction.

[0049] As Figure 5 shown, optionally, a spiral guide plate 630 is fixedly connected above the aeration hole 620.

[0050] Specifically, part of the gas ejected from the aeration hole 620 is guided by the spiral guide plate 630 and diffuses in a spiral manner in the reaction liquid, further intensifying the stirring of the reaction liquid, thus helping to improve the reaction efficiency and the yield of chlorinated ethylene carbonate.

[0051] The technical solution of the present application will be described in detail below with specific embodiments.

[0052] In this embodiment, the chlorine feeding device for producing chlorinated ethylene carbonate has the following operation process during specific operation:

[0053] When producing ethylene carbonate chloride, raw material ethylene carbonate is introduced into the first reaction kettle 1, the second reaction kettle 2, and the third reaction kettle 3. Meanwhile, an ultraviolet lamp group is provided. The first chlorine delivery pipe 410 delivers chlorine from the chlorine main pipe 4 to the aeration pipe 610 and sprays it through the aeration holes 620 to provide chlorine for the first reaction kettle 1. The second chlorine delivery pipe 420 delivers chlorine from the chlorine main pipe 4 to the aeration pipe 610 and sprays it through the aeration holes 620 to provide chlorine for the second reaction kettle 2. Chlorination reactions occur in the first reaction kettle 1 and the second reaction kettle 2 to produce ethylene carbonate chloride. During the reaction process, since chlorine is continuously introduced, there is unreacted chlorine in the first reaction kettle 1 and the second reaction kettle 2. In this embodiment, the specification of the reaction kettle is Φ1200×5000mm, 3 aeration pipes are laid, and the hole density of the aeration holes on the aeration pipe 610 is 25 per mm 2 , reducing the bubble volume to increase the contact area and improve the reaction efficiency.

[0054] The tail gases containing chlorine generated in the first reaction kettle 1 and the second reaction kettle 2 are respectively input into the third reaction kettle 3 from the bottom of the third reaction kettle 3 through the first exhaust pipe 110 and the second exhaust pipe 210 via the chlorine recycling pipe 310. Meanwhile, the third chlorine delivery pipe 340 introduces pure chlorine into the third reaction kettle 3, and all participate in the chlorination reaction. During the specific delivery process, the positive pressure inlet 510 of the venturi tube 5 is connected to the output end of the third blower 320. Driven by the third blower 320, the tail gases containing chlorine from the first exhaust pipe 110 and the second exhaust pipe 210 are positively pressured into the venturi tube 5. Meanwhile, a local negative pressure is formed inside the venturi tube 5, and the chlorine in the third chlorine delivery pipe 340 is inhaled through the negative pressure inlet 520 and mixed. Finally, it enters the third reaction kettle 3 through the diffusion section outlet 530 of the venturi tube 5 via the third aeration unit to participate in the reaction. The tail gas generated during the reaction process in the third reaction kettle 3 is transported to the tail gas treatment device through the tail gas pipe 330 at the top.

[0055] During the reaction process, according to the pressure data detected by each pressure sensor, it is judged whether the pressure in the reaction kettle exceeds the preset pressure. If the pressure is too high, the pressure is reduced by relieving pressure and reducing the chlorine input amount. If the pressure is too low, the reaction rate is increased by increasing the chlorine entry amount, and then the pressure is adjusted to reach the preset pressure.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that; they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A chlorine-introducing device for the production of chlorinated ethylene carbonate, characterized in that, Including: The first reaction kettle (1), the second reaction kettle (2), the third reaction kettle (3), and the main chlorine pipeline (4); The bottom of the first reaction kettle (1) is connected to the main chlorine pipeline (4) through the first chlorine delivery pipe (410). The end of the first chlorine delivery pipe (410) far from the main chlorine pipeline (4) is connected to the first aeration unit, which is located at the inner bottom of the first reaction kettle (1). The bottom of the second reaction kettle (2) is connected to the main chlorine pipeline (4) through the second chlorine delivery pipe (420). The end of the second chlorine delivery pipe (420) far from the main chlorine pipeline (4) is connected to the second aeration unit, which is located at the inner bottom of the second reaction kettle (2); The top of the first reaction kettle (1) is connected to a first exhaust pipe (110), and the top of the second reaction kettle (2) is connected to a second exhaust pipe (210). Both the first exhaust pipe (110) and the second exhaust pipe (210) are connected to the third aeration unit through a chlorine recycling pipe (310). The third aeration unit is arranged at the inner bottom of the third reaction kettle (3). A third blower (320) is arranged on the chlorine recycling pipe (310). The top of the third reaction kettle (3) is connected to a tail gas pipe (330).

2. The chlorine gas feeding device for producing vinyl chloroformate according to claim 1, characterized in that, The chlorine recycling pipe (310) is also connected to the main chlorine pipeline (4) through a third chlorine delivery pipe (340). A solenoid valve (341) is arranged on the third chlorine delivery pipe (340).

3. The chlorine gas introduction device for vinyl chloroformate production according to claim 2, wherein, A Venturi tube (5) is connected between the third blower (320) and the third aeration unit. The positive pressure inlet (510) of the Venturi tube (5) is connected to the output end of the third blower (320). The negative pressure inlet (520) of the Venturi tube (5) is connected to the third chlorine delivery pipe (340). The diffuser section outlet (530) of the Venturi tube (5) is connected to the third aeration unit.

4. The chlorine gas introduction device for vinyl chloroformate production according to claim 1, wherein A first pressure sensor (120) is arranged in the first reaction kettle (1), a second pressure sensor (220) is arranged in the second reaction kettle (2), and a third pressure sensor (350) is arranged in the third reaction kettle (3).

5. The chlorine-introducing device for producing vinyl chloroformate according to claim 1, characterized in that, A first chlorine recycling valve (111) is arranged on the first exhaust pipe (110), and a second chlorine recycling valve (211) is arranged on the second exhaust pipe (210).

6. The chlorine gas introduction device for vinyl chloroformate production according to claim 3, characterized in that, The structures of the first aeration unit, the second aeration unit, and the third aeration unit are the same, including an aeration pipe (610) and aeration holes (620) opened on the aeration pipe (610); The aeration pipe (610) of the first aeration unit is connected to the first chlorine delivery pipe (410), the aeration pipe (610) of the second aeration unit is connected to the second chlorine delivery pipe (420), and the aeration pipe (610) of the third aeration unit is connected to the diffuser section outlet (530) of the Venturi tube (5).

7. The chlorine feeding device for vinyl chloroformate production according to claim 6, characterized in that, A spiral guide plate (630) is fixedly connected above the aeration holes (620).

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