Continuous synthesis process of 2, 4-dichlorphenoxyacetic acid isooctyl ester

Abstract

The invention discloses a continuous synthesis process of 2, 4-dichlorphenoxyacetic acid isooctyl ester, and relates to the technical field of synthesis of 2, 4-dichlorphenoxyacetic acid isooctyl ester, the continuous synthesis process of 2, 4-dichlorphenoxyacetic acid isooctyl ester comprises the following steps: S1, preparation of a sodium phenate solution: dissolving phenol in liquid caustic soda, adding a sodium hydroxide solution, and stirring to obtain the sodium phenate solution; stirring for 20-30 minutes in a normal pressure state through stirring equipment to prepare a sodium phenate solution, heating the prepared sodium phenate solution to 80 DEG C, and carrying out heat preservation treatment. In the process of processing the sodium phenate solution and the isooctyl chloroacetate solution through the tubular reaction device, the sodium phenate solution and the isooctyl chloroacetate solution in the reaction tank body are stirred and pressurized through transmission, the reaction is obviously accelerated, the time required by the reaction is shortened, and the reaction efficiency is improved. The occurrence probability of side reaction caused by non-uniform reaction conditions is reduced, so that the purity and the quality of the product are improved, and the product quality can be better guaranteed compared with conventional mixing.

Description

Technical Field

[0001] The present invention relates to the technical field of the synthesis of isooctyl 2,4-dichlorophenoxyacetate, and specifically to a continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate. Background Technique

[0002] Isooctyl 2,4-dichlorophenoxyacetate is an efficient selective herbicide that can effectively control annual or perennial broad-leaved weeds, such as Cirsium setosum, Sonchus arvensis, Commelina communis, Equisetum arvense, Chenopodium album, Polygonum spp., Silene conoidea, Solanum nigrum, Abutilon theophrasti, Spergularia salina, Stellaria media, Amaranthus spp., Humulus scandens, Xanthium sibiricum, Convolvulus arvensis, etc. It is applicable to a variety of crops such as soybeans, corn, and wheat.

[0003] In the process of continuous synthesis of isooctyl 2,4-dichlorophenoxyacetate, it is necessary to prepare and separate isooctyl phenoxyacetate through an esterification reaction in a tubular reaction device. During the preparation and separation of isooctyl phenoxyacetate, the pressure inside the tubular reaction device. The inside of the tubular reaction device is in an atmospheric pressure state, which affects the rapid preparation of isooctyl phenoxyacetate and further reduces the continuous synthesis efficiency of isooctyl 2,4-dichlorophenoxyacetate. For this reason, we propose a continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate. Summary of the Invention

[0004] The purpose of the present invention is to provide a continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate, including the following steps:

[0006] S1: Preparation of sodium phenoxide solution. Dissolve phenol in liquid alkali and stir for 20 - 30 minutes under atmospheric pressure using a stirring device to prepare a sodium phenoxide solution. Heat the prepared sodium phenoxide solution to 80°C and keep it warm.

[0007] S2: Preparation of isooctyl chloroacetate. Heat isooctyl chloroacetate to 80°C and keep it warm under atmospheric pressure.

[0008] S3: Esterification reaction. Pump the prepared and heated sodium phenoxide solution and isooctyl chloroacetate solutions into the inside of a tubular reaction device through a delivery pump. The reaction temperature inside the tubular reaction device is set to 80°C and under the action of an internal pressure of 0.1 - 0.2 MPa, after reacting for 2 hours, layering occurs. The lower layer is isooctyl phenoxyacetate and the upper layer is wastewater.

[0009] S4: Chlorination reaction. Isooctyl phenoxyacetate and chlorine are transported into a tubular reactor. The internal reaction temperature of the tubular reactor is set at 60 °C and under an internal pressure of 0.1 - 0.3 MPa, 2,4 - dichloroisooctyl phenoxyacetate is generated through the reaction.

[0010] S5: Wastewater recovery. The wastewater generated in S3 is neutralized with hydrochloric acid, phenol is separated out, and then recycled for reuse.

[0011] Preferably, in the transportation step of S3, the mixing ratio of isooctyl chloroacetate and sodium phenoxide solution is 1:1.15.

[0012] Preferably, in the transportation step of S4, the mixing ratio of isooctyl phenoxyacetate and chlorine is 1:1.12.

[0013] Preferably, the tubular reaction device includes a reaction tank body. A support frame is fixed at the lower end of the reaction tank body. Two feed pipes for transporting sodium phenoxide solution and isooctyl chloroacetate respectively are installed at the upper end of the reaction tank body. An outlet pipe for assisting the discharge of isooctyl phenoxyacetate is arranged at the lower end of the reaction tank body. Control valves are arranged on both the feed pipes and the outlet pipe. A piston plate is arranged inside the reaction tank body, and the interior of the reaction tank body is divided into a lower cavity and an upper cavity by the piston plate. The lower cavity is located below the upper cavity. One ends of the two feed pipes pass through the piston plate. A sealing assembly for sealing is arranged between the piston plate and the inner wall of the reaction tank body. An elevating assembly for lifting the piston plate and a guiding assembly for guiding during the lifting process are arranged inside the upper cavity. A stirring assembly for stirring is arranged inside the lower cavity. A control pipe is installed on the piston plate in a communicating manner, and both ends of the control pipe are communicated with the upper cavity and the lower cavity respectively. A control assembly for controlling the internal pressure of the lower cavity is arranged inside the control pipe.

[0014] The stirring assembly includes a spline barrel rotatably connected inside the lower cavity. Stirring vanes are fixed on the spline barrel. A spline shaft is slidably connected to the spline barrel. One end of the spline shaft is rotatably connected to the lower end of the piston plate. A sealing assembly for sleeving and sealing the spline shaft is arranged between the spline barrel and the bottom of the piston plate.

[0015] Preferably, the protective assembly includes a bellows cover sleeved outside the spline shaft. Rings and rotating plates are respectively fixed at both ends of the bellows cover. The ring is sleeved and fixed outside the spline barrel. The rotating plate is rotatably connected to the lower end of the piston plate.

[0016] Preferably, the lifting component includes a threaded tube rotatably connected to the piston plate. One end of the threaded tube is fixed to one end of the spline shaft. A threaded rod is in threaded engagement with the threaded tube. The threaded rod is rotatably connected to the inside of the reaction tank body. A driving component for driving the threaded tube is arranged inside the upper cavity.

[0017] Preferably, the guiding component includes two groups of first sleeves fixed to the upper end of the piston plate. The two groups of first sleeves are symmetrically arranged on both sides of the threaded tube. A first sliding rod is slidably connected to the first sleeve. One end of the first sliding rod is fixed to the inside of the reaction tank body.

[0018] Preferably, the driving component includes a gear ring sleeved and fixed on the outside of the threaded tube. An L-shaped frame is fixed to the upper end of the piston plate. A mounting shaft is rotatably connected to the L-shaped frame. A gear is fixed to the mounting shaft. The gear is meshed with the gear ring. A driving motor for driving the mounting shaft is installed on the L-shaped frame.

[0019] Preferably, the sealing component includes an annular groove formed on the outside of the piston plate. A sealing ring for abutting against the inner side of the reaction tank is installed inside the annular groove.

[0020] Preferably, the control component includes a control sleeve fixed inside the control tube. A conical groove facing the lower cavity is formed on the control sleeve. A sphere for sealingly abutting against the conical groove is arranged inside the control sleeve. A elastic force component for elastically extruding the sphere is arranged inside the control tube;

[0021] The elastic force component includes a filter plate fixed inside the control tube. A second sleeve is fixed to the filter plate. A second sliding rod is slidably connected to the second sleeve. One end of the second sliding rod is fixed to the sphere. A spring is sleeved on the outside of the second sleeve. Both ends of the spring abut against the sphere and the filter plate respectively.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] In the process of processing sodium phenoxide solution and isooctyl chloroacetate solution by the tubular reaction device of the present invention, through transmission, the sodium phenoxide solution and isooctyl chloroacetate solution inside the reaction tank body are stirred and pressurized simultaneously, significantly accelerating the reaction, shortening the reaction time, and reducing the occurrence probability of side reactions caused by uneven reaction conditions, thereby improving the purity and quality of the product and better ensuring the product quality compared with conventional mixing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the preparation process of the present invention;

[0025] Figure 2 Schematic structural diagram of the tubular reaction device of the present invention;

[0026] Figure 3 Schematic bottom structural diagram of the tubular reaction device of the present invention;

[0027] Figure 4 Schematic structural diagram of the stirring assembly of the present invention;

[0028] Figure 5 Schematic structural diagram of the sealing assembly of the present invention;

[0029] Figure 6 Schematic structural diagram of the lifting assembly of the present invention;

[0030] Figure 7 Schematic structural diagram of the guiding assembly and the driving assembly of the present invention;

[0031] Figure 8 Schematic structural diagram of the control assembly and the elastic force assembly of the present invention.

[0032] In the figure: 101 - reaction tank body; 102 - support frame; 103 - feed pipe; 104 - discharge pipe; 2 - piston plate; 301 - annular groove; 302 - sealing ring; 401 - spline cylinder; 402 - stirring blade; 403 - spline shaft; 501 - bellows; 502 - collar; 503 - rotating plate; 601 - threaded pipe; 602 - threaded rod; 701 - first sleeve; 702 - first slide bar; 801 - gear ring; 802 - L-shaped frame; 803 - mounting shaft; 804 - gear; 805 - driving motor; 9 - control pipe; 1001 - control sleeve; 1002 - tapered groove; 1003 - sphere; 1101 - filter plate; 1102 - second sleeve; 1103 - second slide bar; 1104 - spring. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1

[0035] Please refer to Figures 1-8 , a continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate shown in the figure, including the following steps:

[0036] S1: Preparation of sodium phenoxide solution. Dissolve phenol in liquid alkali, and stir for 20 - 30 min under normal pressure with a stirring device to prepare sodium phenoxide solution. Heat the prepared sodium phenoxide solution to 80 °C and keep it warm.

[0037] It should be noted here that: the alkali solution is sodium hydroxide solution in this embodiment.

[0038] S2: Preparation of isooctyl chloroacetate. Heat isooctyl chloroacetate to 80 °C under normal pressure and keep it warm.

[0039] S3: Esterification reaction. Pump the two solutions of the prepared and heated sodium phenoxide solution and isooctyl chloroacetate into the internal of the tubular reaction device through a transfer pump. Set the internal reaction temperature of the tubular reaction device to 80 °C and under the action of an internal pressure of 0.1 - 0.2 MPa. After reacting for 2 h, layering occurs. The lower layer is isooctyl phenoxyacetate, and the upper layer is wastewater.

[0040] S4: Chlorination reaction. Isooctyl phenoxyacetate and chlorine are transported into the tubular reactor. Set the internal reaction temperature of the tubular reactor to 60 °C and under the action of an internal pressure of 0.1 - 0.3 MPa. Through the reaction, isooctyl 2,4 - dichlorophenoxyacetate is generated.

[0041] S5: Wastewater recovery. Neutralize the wastewater generated in S3 with hydrochloric acid, separate out phenol, and recycle and reuse it.

[0042] Preferably, in the transportation of step S3, the mixing ratio of isooctyl chloroacetate to sodium phenoxide solution is 1:1.15.

[0043] Preferably, in the transportation of step S4, the mixing ratio of isooctyl phenoxyacetate to chlorine is 1:1.12.

[0044] Preferably, the tubular reaction device includes a reaction tank body 101. A support frame 102 is fixed to the lower end of the reaction tank body 101. Two feed pipes 103 for transporting sodium phenoxide solution and isooctyl chloroacetate respectively are installed at the upper end of the reaction tank body 101. A discharge pipe 104 for assisting the discharge of isooctyl phenoxyacetate is arranged at the lower end of the reaction tank body 101. Control valves are arranged on both the feed pipe 103 and the discharge pipe 104. A piston plate 2 is arranged inside the reaction tank body 101, and the inside of the reaction tank body 101 is divided into a lower cavity and an upper cavity by the piston plate 2. The lower cavity is located below the upper cavity. One ends of the two feed pipes 103 pass through the piston plate 2. A sealing component for sealing is arranged between the piston plate 2 and the inner wall of the reaction tank body 101. An elevating component for lifting the piston plate 2 and a guiding component for guiding during the lifting process are arranged inside the upper cavity. A stirring component for stirring is arranged inside the lower cavity. A control pipe 9 is installed on the piston plate 2 in a communicating manner. Both ends of the control pipe 9 are communicated with the upper cavity and the lower cavity respectively. A control component for controlling the pressure inside the lower cavity is arranged inside the control pipe 9;

[0045] It should be noted here that: during the process of processing the sodium phenoxide solution and isooctyl chloroacetate solutions by the tubular reaction device, through transmission, the sodium phenoxide solution and isooctyl chloroacetate solutions inside the reaction tank body 101 are stirred and pressurized simultaneously, significantly accelerating the reaction, shortening the reaction time, and reducing the occurrence probability of side reactions caused by uneven reaction conditions, thereby improving the purity and quality of the product, and better ensuring the product quality compared with conventional mixing.

[0046] The stirring component includes a spline cylinder 401 rotatably connected inside the lower cavity. Stirring vanes 402 are fixed on the spline cylinder 401. A spline shaft 403 is slidably connected to the spline cylinder 401. One end of the spline shaft 403 is rotatably connected to the lower end of the piston plate 2. A protective component for sleeving and sealing protection of the spline shaft 403 is arranged between the spline cylinder 401 and the bottom of the piston plate 2;

[0047] It should be noted here that: during the rotation of the threaded pipe 601, the spline shaft 403 is driven to rotate synchronously. During the rotation of the spline shaft 403, through the meshing transmission between the spline shaft 403 and the spline cylinder 401, the stirring vanes 402 are driven to rotate. Through the rotation of the stirring vanes 402, the reaction between the sodium phenoxide solution and isooctyl chloroacetate solutions is stirred, and the reaction efficiency between the sodium phenoxide solution and isooctyl chloroacetate solutions is improved through stirring.

[0048] Preferably, the protection component includes a bellows cover 501 sleeved outside the spline shaft 403. At both ends of the bellows cover 501, a collar 502 and a rotating plate 503 are respectively fixed. The collar 502 is sleeved and fixed outside the spline cylinder 401, and the rotating plate 503 is rotatably connected to the lower end of the piston plate 2;

[0049] It should be noted here that: through the sealing effect of the bellows cover 501 and the connection effect of the collar 502 and the rotating plate 503, the spline shaft 403 is sealed and protected.

[0050] Preferably, the lifting component includes a threaded pipe 601 rotatably connected to the piston plate 2. One end of the threaded pipe 601 is fixed to one end of the spline shaft 403. A threaded rod 602 is threadedly engaged with the threaded pipe 601. The threaded rod 602 is rotatably connected inside the reaction tank body 101, and a driving component for driving the threaded pipe 601 is arranged inside the upper cavity; the guiding component includes two groups of first sleeves 701 fixed to the upper end of the piston plate 2, and the two groups of first sleeves 701 are symmetrically arranged on both sides of the threaded pipe 601. A first sliding rod 702 is slidably connected to the first sleeve 701, and one end of the first sliding rod 702 is fixed to the inside of the reaction tank body 101;

[0051] It should be noted here that: during the rotation of the threaded pipe 601, through the meshing transmission between the threaded pipe 601 and the threaded rod 602, the piston plate 2 is forced to move. During the movement of the piston plate 2, through the sliding guiding effect of the two groups of first sleeves 701 and the two groups of first sliding rods 702, the stressed piston plate 2 moves up and down inside the reaction tank body 101.

[0052] Preferably, the driving component includes a gear ring 801 sleeved and fixed outside the threaded pipe 601. An L-shaped frame 802 is fixed to the upper end of the piston plate 2. A mounting shaft 803 is rotatably connected to the L-shaped frame 802. A gear 804 is fixed to the mounting shaft 803. The gear 804 and the gear ring 801 are meshed with each other, and a driving motor 805 for driving the mounting shaft 803 is installed on the L-shaped frame 802;

[0053] It should be noted here that: through the driving motor 805, the mounting shaft 803 is driven to rotate. During the rotation of the mounting shaft 803, the gear 804 is driven to rotate. During the rotation of the gear 804, through the meshing transmission between the gear 804 and the gear ring 801, the threaded pipe 601 is rotated.

[0054] Preferably, the sealing component includes an annular groove 301 opened outside the piston plate 2, and a sealing ring 302 for abutting against the inner side of the reaction tank body 101 is installed inside the annular groove 301;

[0055] It should be noted here that: through the annular groove 301 and the sealing ring 302, it is convenient for the piston plate 2 to be in contact and sealed with the inner side of the reaction tank body 101.

[0056] Preferably, the control assembly includes a control sleeve 1001 fixed inside the control pipe 9. A conical groove 1002 is provided on the control sleeve 1001 and is arranged towards the lower cavity. A sphere 1003 is arranged inside the control sleeve 1001 for sealingly contacting the conical groove 1002. An elastic force assembly is arranged inside the control pipe 9 for elastically extruding the sphere 1003;

[0057] It should be noted here that: during the process of the piston plate 2 descending inside the reaction tank body 101 to increase the pressure in the lower cavity, since the inside of the control pipe 9 and the control sleeve 1001 communicates with the lower cavity, while increasing the pressure in the lower cavity, the reverse thrust on the sphere 1003 is increased. When the pressure inside the lower cavity is greater than the extrusion force of the spring 1104 on the sphere 1003, through the action of pressure, a gap is generated between the sphere 1003 and the conical groove 1002. At this time, part of the gas inside the lower cavity is discharged into the upper cavity through the gap between the sphere 1003 and the conical groove 1002 inside the control pipe 9, so that during the pressurization process, the pressure in the lower cavity of the reaction tank body 101 no longer continues to increase after reaching a certain value, avoiding the impact on the reaction caused by excessive pressure.

[0058] The elastic force assembly includes a filter plate 1101 fixed inside the control pipe 9. A second sleeve 1102 is fixed on the filter plate 1101. A second sliding rod 1103 is slidably connected to the second sleeve 1102. One end of the second sliding rod 1103 is fixed to the sphere 1003. A spring 1104 is sleeved outside the second sleeve 1102. The two ends of the spring 1104 are respectively in contact with the sphere 1003 and the filter plate 1101;

[0059] It should be noted here that: through the second sleeve 1102 and the second sliding rod 1103, it assists the stable expansion and contraction of the sphere 1003 after receiving force. Through the spring 1104, it is convenient to extrude and push the sphere 1003 so that the sphere 1003 is in contact with the conical groove 1002.

[0060] In this solution: a continuous synthesis process of isooctyl 2,4 - dichlorophenoxyacetate includes the following steps:

[0061] During the process of processing the sodium phenoxide solution and the isooctyl chloroacetate solution through the tubular reaction device, the sodium phenoxide solution and the isooctyl chloroacetate solution are conveyed to the lower cavity below the piston plate 2 inside the reaction tank body 101 through the connection of two groups of feed pipes 103. The sodium phenoxide solution and the isooctyl chloroacetate solution react to generate isooctyl phenoxyacetate and wastewater and form a layer separation;

[0062] During the reaction between sodium phenoxide solution and isooctyl chloroacetate solution, the driving motor 805 drives the installation shaft 803 to rotate. During the rotation of the installation shaft 803, the gear 804 is driven to rotate. During the rotation of the gear 804, through the meshing transmission between the gear 804 and the gear ring 801, the threaded tube 601 is driven to rotate. During the rotation of the threaded tube 601, the spline shaft 403 is driven to rotate synchronously. During the rotation of the spline shaft 403, through the meshing transmission between the spline shaft 403 and the spline barrel 401, the stirring blade 402 is driven to rotate. Through the rotation of the stirring blade 402, the reaction between sodium phenoxide solution and isooctyl chloroacetate solution is stirred. By stirring, the reaction efficiency between sodium phenoxide solution and isooctyl chloroacetate solution is improved. And during the rotation of the threaded tube 601, through the meshing transmission between the threaded tube 601 and the threaded rod 602, the piston plate 2 is forced to move. During the movement of the piston plate 2, through the sliding guiding action of the two groups of first sleeves 701 and the two groups of first sliding rods 702, the stressed piston plate 2 moves downward inside the reaction tank body 101. During the movement of the piston plate 2, the inside of the lower wall is extruded, so that sodium phenoxide solution and isooctyl chloroacetate solution are in a high-pressure reaction environment. Through the high-pressure reaction environment, the reactant molecules are more dispersed and uniform in the solution, thereby increasing the contact opportunities between molecules and shortening the reaction time required. Compared with conventional mixing, the production efficiency can be improved more;

[0063] During the process of the piston plate 2 descending inside the reaction tank body 101 to increase the pressure of the lower cavity, since the inside of the control pipe 9 and the control sleeve 1001 is communicated with the lower cavity, while increasing the pressure inside the lower cavity, the reverse thrust on the sphere 1003 is increased. And when the pressure inside the lower cavity is greater than the extrusion force of the spring 1104 on the sphere 1003, through the pressure action, a gap is generated between the sphere 1003 and the conical groove 1002. At this time, part of the gas inside the lower cavity of the reaction tank body 101 is discharged into the upper cavity through the gap between the sphere 1003 and the conical groove 1002 inside the control pipe 9, so that during the pressurization process, the pressure inside the lower cavity of the reaction tank body 101 will not continue to increase after reaching a certain value, avoiding the impact on the reaction caused by excessive pressure.

[0064] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0065] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate, characterized in that, It includes the following steps: S1: Preparation of sodium phenoxide solution. Dissolve phenol in liquid alkali, and stir for 20 - 30 minutes under normal pressure by a stirring device to prepare a sodium phenoxide solution. Heat the prepared sodium phenoxide solution to 80°C and keep it warm; S2: Preparation of isooctyl chloroacetate. Heat isooctyl chloroacetate to 80°C and keep it warm under normal pressure; S3: Esterification reaction. Pump the prepared and heated sodium phenoxide solution and isooctyl chloroacetate solutions into the internal of a tubular reaction device through a transfer pump. The internal reaction temperature of the tubular reaction device is set at 80°C and under the action of an internal pressure of 0.1 - 0.2 MPa. After reacting for 2 hours, layering occurs. The lower layer is isooctyl phenoxyacetate, and the upper layer is wastewater; S4: Chlorination reaction. Isooctyl phenoxyacetate and chlorine are transported into a tubular reactor. The internal reaction temperature of the tubular reactor is set at 60°C and under the action of an internal pressure of 0.1 - 0.3 MPa, and 2,4 - dichloroisooctyl phenoxyacetate is generated through the reaction; S5: Wastewater recovery. Neutralize the wastewater generated in S3 with hydrochloric acid, separate out phenol, and recycle it for reuse.

2. The continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 1, characterized in that: In the transportation of step S3, the mixing ratio of isooctyl chloroacetate to sodium phenoxide solution is 1:1.

15.

3. The continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 2, characterized in that: In the transportation of step S4, the mixing ratio of isooctyl phenoxyacetate to chlorine is 1:1.

12.

4. A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 3, characterized in that: The tubular reaction device includes a reaction tank body (101). A support frame (102) is fixed at the lower end of the reaction tank body (101). Two feed pipes (103) for transporting sodium phenoxide solution and isooctyl chloroacetate respectively are installed at the upper end of the reaction tank body (101). An outlet pipe (104) for assisting the discharge of isooctyl phenoxyacetate is arranged at the lower end of the reaction tank body (101). Control valves are arranged on both the feed pipe (103) and the outlet pipe (104). A piston plate (2) is arranged inside the reaction tank body (101), and the inside of the reaction tank body (101) is divided into a lower cavity and an upper cavity by the piston plate (2). The lower cavity is located below the upper cavity. One ends of the two feed pipes (103) pass through the piston plate (2). A sealing component for sealing is arranged between the piston plate (2) and the inner wall of the reaction tank body (101). An elevating component for lifting the piston plate (2) and a guiding component for guiding during the lifting process are arranged inside the upper cavity. A stirring component for stirring is arranged inside the lower cavity. A control pipe (9) is installed on the piston plate (2) in a communicating manner. Both ends of the control pipe (9) are communicated with the upper cavity and the lower cavity respectively. A control component for controlling the internal pressure of the lower cavity is arranged inside the control pipe (9); The stirring assembly includes a spline tube (401) rotatably connected to the inside of the lower cavity. A stirring blade (402) is fixed on the spline tube (401). A spline shaft (403) is slidably connected to the spline tube (401). One end of the spline shaft (403) is rotatably connected to the lower end of the piston plate (2). A sealing assembly for sleeving and sealing the spline shaft (403) is provided between the spline tube (401) and the bottom of the piston plate (2).

5. A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 3, characterized in that: The protection assembly includes a bellows (501) sleeved outside the spline shaft (403). A collar (502) and a rotating plate (503) are respectively fixed at both ends of the bellows (501). The collar (502) is sleeved and fixed on the outside of the spline tube (401). The rotating plate (503) is rotatably connected to the lower end of the piston plate (2).

6. A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 5, characterized in that: The lifting assembly includes a threaded tube (601) rotatably connected to the piston plate (2). One end of the threaded tube (601) is fixed to one end of the spline shaft (403). A threaded rod (602) is threadedly engaged with the threaded tube (601). The threaded rod (602) is rotatably connected to the inside of the reaction tank body (101). A driving assembly for driving the threaded tube (601) is provided inside the upper cavity.

7. A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 6, characterized in that: The guiding assembly includes two groups of first sleeves (701) fixed to the upper end of the piston plate (2). The two groups of first sleeves (701) are symmetrically arranged on both sides of the threaded tube (601). A first sliding rod (702) is slidably connected to the first sleeve (701). One end of the first sliding rod (702) is fixed to the inside of the reaction tank body (101).

8. A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 6, characterized in that: The driving assembly includes a gear ring (801) sleeved and fixed outside the threaded tube (601). An L-shaped frame (802) is fixed to the upper end of the piston plate (2). A mounting shaft (803) is rotatably connected to the L-shaped frame (802). A gear (804) is fixed on the mounting shaft (803). The gear (804) and the gear ring (801) are meshed with each other. A driving motor (805) for driving the mounting shaft (803) is installed on the L-shaped frame (802).

9. A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 3, characterized in that: The sealing assembly includes an annular groove (301) opened on the outside of the piston plate (2). A sealing ring (302) for abutting against the inner side of the reaction tank body (101) is installed inside the annular groove (301).

10. A continuous synthesis process of isooctyl 2,4-dichlorophenoxyacetate according to claim 3, characterized in that: The control assembly includes a control sleeve (1001) fixed inside the control tube (9). A conical groove (1002) facing the lower cavity is opened on the control sleeve (1001). A sphere (1003) for sealingly abutting against the conical groove (1002) is arranged inside the control sleeve (1001). A elastic force assembly for elastically extruding the sphere (1003) is arranged inside the control tube (9). The elastic component includes a filter plate (1101) fixed inside the control pipe (9). A second sleeve (1102) is fixed on the filter plate (1101). A second sliding rod (1103) is slidably connected to the second sleeve (1102). One end of the second sliding rod (1103) is fixed to the sphere (1003). A spring (1104) is sleeved outside the second sleeve (1102). The two ends of the spring (1104) are respectively abutted against the sphere (1003) and the filter plate (1101).

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