Oxo-phenylacetate esterification reaction raw material ratio control device

Abstract

The invention discloses a raw material ratio control device for esterification reaction of oxo-phenylacetate, and belongs to the technical field of phenylacetate production. The device comprises a reaction kettle, a phenylacetic acid storage box, a proportioning assembly, a feeding assembly and a detection assembly, the phenylacetic acid storage box and the proportioning assembly are respectively mounted on the upper side of the reaction kettle and are respectively communicated with the reaction kettle through pipelines; the feeding assembly is arranged on the upper side of the phenylacetic acid storage box and the proportioning assembly and is used for adding alcohols; the proportioning assembly at least comprises a proportioning box; a proportioning mechanism is arranged in the proportioning box, the proportioning mechanism at least comprises two independent proportioning cavities, and the same alcohol is arranged in the different proportioning cavities; the detection assembly is arranged in the reaction kettle and is used for detecting the conversion rate of the reaction in real time; according to the invention, a plurality of alcohol raw materials can be proportioned, the subsequent supplementation and addition of alcohols can be controlled according to the real-time conversion rate, and the phenylacetate raw material proportioning and feeding production efficiency can be improved.

Description

Technical Field

[0001] This invention belongs to the field of oxyphenylacetic acid ester technology, and more specifically, relates to a device for controlling the proportion of raw materials in the esterification reaction of oxyphenylacetic acid ester. Background Technology

[0002] In the industrial production of different types of oxophenylacetic acid esters, an excess of alcohol is usually used to react with oxophenylacetic acid. The molar ratio of oxophenylacetic acid and alcohol as raw materials needs to be adjusted and controlled according to the properties of the alcohol used and the economics of the process.

[0003] While using excess alcohol is a common strategy to drive reaction equilibrium and improve conversion, the specific ratio is affected by several key factors: 1. Generally, the lower the boiling point of the alcohol, the lower the recovery cost. Low-boiling-point alcohols (such as methanol and ethanol) have boiling points much lower than water and the generated esters (as well as oxophenylacetic acid itself). Excess ethanol / methanol can be easily and efficiently recovered in subsequent distillations using atmospheric or low-pressure distillation at low cost. High-boiling-point alcohols (such as benzyl alcohol, isoamyl alcohol, 2-ethylhexanol, etc.) have higher boiling points, close to or higher than the generated esters. Recovering them requires higher vacuum and higher distillation column efficiency, significantly increasing energy consumption and cost. 2. If a certain alcohol is expensive (such as certain long-chain alcohols or special flavoring alcohols), even if its boiling point is not particularly high, the excess ratio will be strictly controlled (e.g., 1:1.05 to 1:1.2) to minimize the waste of expensive alcohol in the recovery process or as an impurity in the final product.

[0004] In existing raw material proportioning devices, only a single type of alcohol can usually be proportioned during the proportioning process. Since different alcohols require different excess ratios, the excess ratio required for the same alcohol in actual production is also different. It is necessary to control the subsequent replenishment of alcohol based on the real-time conversion rate. Existing proportioning devices either pre-proportion excess alcohol, which leads to waste, or re-introduce raw material during the production process, which leads to reduced production efficiency. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a raw material ratio control device for the esterification reaction of oxyphenylacetic acid ester. It can realize the ratio of various alcohol raw materials and control the subsequent replenishment of alcohol according to the real-time conversion rate, thereby avoiding raw material waste and improving the efficiency of raw material transportation. It can improve the production efficiency of phenylacetic acid ester raw material ratio and feeding.

[0006] This invention discloses a raw material ratio control device for the esterification reaction of oxyphenylacetic acid esters, comprising a reaction vessel, a phenylacetic acid storage tank, a ratioing component, a feeding component, and a detection component. The phenylacetic acid storage tank and the ratioing component are respectively installed on the upper side of the reaction vessel, and are connected to the reaction vessel via pipelines. The feeding component is disposed on the upper side of the phenylacetic acid storage tank and the ratioing component for adding alcohols. The ratioing component includes at least one ratioing tank. The ratioing tank is provided with a ratioing mechanism, which includes at least two independent ratioing chambers, each containing the same type of alcohol. The detection component is disposed inside the reaction vessel for real-time detection of the reaction conversion rate.

[0007] As a further improvement of the present invention, the proportioning mechanism includes a separator cylinder, an adjusting shaft, a distributing hopper, a flow guide seat, and a one-way shut-off valve; the separator cylinder is fixedly and coaxially disposed inside the proportioning box; a feed pipe is connected to the upper part of the proportioning box, and a discharge pipe is connected to the lower part; the outlet of the feed pipe is located inside the separator cylinder, and the outlet of the discharge pipe is located between the separator cylinder and the proportioning box; the adjusting shaft is embedded inside the proportioning box, and the distributing hopper and the flow guide seat are respectively fixedly disposed on the lower outer side of the adjusting shaft; the upper side of the distributing hopper and the separator cylinder forms an inclined surface to guide alcohols into the outer side of the separator cylinder; a channel is formed between the flow guide seat and the feed pipe to guide alcohols into the inner side of the separator cylinder; the one-way shut-off valve is fixedly disposed on the lower side wall of the separator cylinder, and the one-way shut-off valve connects the inner and outer sides of the separator cylinder through a shut-off assembly.

[0008] As a further improvement of the present invention, an upper cover plate is fixedly provided on the upper side of the mixing box, and a lower cover plate is fixedly provided on the lower side; the lower side of the separator cylinder is fixedly connected to the bottom of the mixing box, the height of the separator cylinder is lower than the height of the mixing box, and there is a gap between the separator cylinder and the upper part of the mixing box; the inner side of the separator cylinder forms a first mixing cavity, and the outer side of the separator cylinder and the inner side of the mixing box form a second mixing cavity.

[0009] As a further improvement of the present invention, the dispensing hopper includes a connecting plate, a guide plate, a guide ring, and a baffle; one side of the connecting plate is fixedly connected to the outer side of the adjusting shaft, and the other side is fixedly connected to the upper end of the guide plate; the guide plate has an inclined structure, and the inclined surface slopes downward along the outer side of the adjusting shaft; a guide ring is fixedly provided on the outer side of the lower end of the guide plate, and the lower side of the guide ring abuts against the upper edge of the dividing cylinder; when feeding material into the first proportioning chamber, the inclined surface of the guide plate is located below the feed pipe.

[0010] As a further improvement of the present invention, the flow guide seat includes a connecting rod and a flow guide cylinder; one end of the connecting rod is fixedly connected to the adjusting shaft, and the other end is fixedly connected to the flow guide cylinder; the flow guide cylinder has a flow guide hole that runs vertically through it; the length of the connecting rod is less than the inner diameter of the dividing cylinder; when feeding material into the second proportioning chamber, the flow guide cylinder is located on the lower side of the feed pipe so that the flow guide hole is directly opposite the feed pipe.

[0011] As a further improvement of the present invention, a flow-blocking ring is fixedly provided on the outer side of the one-way flow-blocking valve; the flow-blocking assembly includes a flow-blocking shaft and an air pump, the flow-blocking shaft is coaxially arranged with the one-way flow-blocking valve, a mating ring is provided at one end of the flow-blocking shaft near the one-way flow-blocking valve, and the other end is connected to the output end of the air pump to drive the flow-blocking shaft to move horizontally in the axial direction; a sealing element is provided between the flow-blocking shaft and the side wall of the mixing chamber; the flow-blocking ring and the mating ring can be sealed and engaged to block the flow of alcohol in the second mixing chamber.

[0012] As a further improvement of the present invention, when the feeding component feeds the material, a certain amount of base liquid is pre-feeded in the first mixing chamber, and the ratio of the base liquid of alcohol to the phenylacetic acid in the phenylacetic acid storage tank is:; the second mixing chamber is pre-filled with the same alcohol as the first mixing chamber.

[0013] As a further improvement of the present invention, it includes multiple independent proportioning boxes; the feeding assembly includes a feeding disc, a rotating ring, and a feeding rod; the feeding disc has several through holes, the size of which matches the outer diameter of the feed pipe, and the number of through holes matches the number of feed pipes; the feeding disc is fixedly nested on the upper side of the proportioning box; a rotating motor is provided at the center of the feeding disc, and the output end of the rotating motor is fixedly set to the rotating ring to drive the rotating ring to rotate around the central axis of the feeding disc; one end of the feeding rod is fixedly connected to the outer side of the rotating ring, and the other end is connected to the feeding pipes of different alcohols on the upper side.

[0014] As a further improvement of the present invention, different types of alcohols are added to different mixing tanks.

[0015] As a further improvement of the present invention, it also includes a material guiding assembly, which includes a first material guiding pipe, a second material guiding pipe, a diversion pipe, and a material guiding valve; the phenylacetic acid storage tank and the reaction vessel are connected by the first material guiding pipe; the diversion pipe is disposed below the mixing tank, and the diversion pipe includes a plurality of branch pipes, the number of branch pipes being equal to the number of discharge pipes; the branch pipes are connected to the discharge pipes one by one, and a material guiding valve is correspondingly provided on the lower side of each discharge pipe; the diversion pipe is connected to the second material guiding pipe, and the second material guiding pipe is connected to the reaction vessel.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By setting up a proportioning component, the feed hopper and the guide seat are connected to different types of alcohol raw material interfaces sequentially during alcohol feeding. The one-way shut-off valve is controlled by the interception component to transfer the alcohol in the second proportioning chamber to the first proportioning chamber. The detection component detects the conversion rate of the reaction in real time. It can realize the proportioning of multiple alcohol raw materials and control the subsequent replenishment of alcohol based on the real-time conversion rate, avoiding raw material waste while improving the efficiency of raw material transportation. It can improve the production efficiency of phenylacetic acid raw material proportioning and feeding.

[0017] 2. By setting up a feeding component, the feeding component can independently add raw materials to several different mixing tanks, and simultaneously add different types of alcohols to different mixing tanks; after adding raw materials to the first mixing tank for production, the feeding component can be used to add raw materials to other mixing tanks for mixing, adding multiple mixing tanks at once, optimizing the feeding process, and improving overall production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the feeding assembly of the present invention; Figure 3 This is a schematic diagram of the material guiding assembly of the present invention; Figure 4 This is an internal cross-sectional view of the proportioning component of the present invention; Figure 5 This is a schematic diagram of the material distribution hopper and flow guide seat of the present invention; Figure 6 This is a schematic diagram of the flow interception component of the present invention.

[0019] Explanation of the labels in the diagram: 1. Reactor; 2. Phenylacetic acid storage tank; 3. Proportioning assembly; 31. Proportioning box; 311. Upper cover plate; 312. Lower cover plate; 313. Feed pipe; 314. Discharge pipe; 32. Divider cylinder; 321. First proportioning chamber; 322. Second proportioning chamber; 33. Adjusting shaft; 34. Distributing hopper; 341. Connecting plate; 342. Guide plate; 343. Guide ring; 353. Baffle; 35. Guide seat; 351. Connecting rod; 351. Guide cylinder; 352. Guide hole; 353. One-way shut-off valve; 36. Flow blocking ring; 361. Flow blocking assembly; 37. Flow blocking shaft; 372. Connecting ring; 4. Feeding assembly; 41. Feeding tray; 42. Rotating ring; 43. Receiving rod; 5. Guide assembly; 51. First guide pipe; 52. Second guide pipe; 53. Divider pipe; 54. Guide valve. Detailed Implementation

[0020] Specific Implementation Example 1: Please refer to... Figures 1-6 A device for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid esters, comprising a reaction vessel 1, a phenylacetic acid storage tank 2, a proportioning component 3, a feeding component 4, a feeding guide component 5, and a detection component.

[0021] The phenylacetic acid storage tank 2 and the proportioning component 3 are respectively installed on the upper side of the reactor 1, and are connected to the reactor 1 via pipelines. The feeding component 4 is located above the phenylacetic acid storage tank 2 and the proportioning component 3, and is used to add alcohols. In this embodiment, the alcohols include methanol, ethanol, benzyl alcohol, isoamyl alcohol, and 2-ethylhexanol. In this embodiment, the detection component includes infrared spectroscopy detection. An immersion probe is installed on the side wall of the reactor 1 via a flange (not shown in the figure). The probe is located in the reaction system and is connected to a spectrometer. Detecting the conversion rate of reactants using infrared spectroscopy is a conventional existing technique; its specific connection relationship and working principle will not be elaborated here.

[0022] In this embodiment, the proportioning component 3 includes several independent proportioning chambers 31, each containing different types of alcohols. Preferably, in this embodiment, four proportioning chambers 31 are provided, arranged in a 90° circle around each other. Each proportioning chamber 31 is equipped with a proportioning mechanism for adjusting the volume of the proportioning chamber within the chamber.

[0023] In this embodiment, the proportioning mechanism includes a separator 32, an adjusting shaft 33, a distributing hopper 34, a flow guide seat 35, and a one-way shut-off valve 36.

[0024] A top cover plate 311 is fixedly installed on the upper side of the mixing tank 31, and a bottom cover plate 312 is fixedly installed on the lower side. The lower side of the separator cylinder 32 is fixedly connected to the bottom of the mixing tank 31. The height of the separator cylinder 32 is lower than the height of the mixing tank 31, and there is a gap between the separator cylinder 32 and the upper part of the mixing tank 31. The inner side of the separator cylinder 32 forms a first mixing chamber 321, and the outer side of the separator cylinder 32 and the inner side of the mixing tank 31 form a second mixing chamber 322. The separator cylinder 32 is fixedly and coaxially installed inside the mixing tank 31. A feed pipe 313 is connected to the upper part of the mixing tank 31, and a discharge pipe 314 is connected to the lower part. The outlet of the feed pipe 313 is located inside the separator cylinder 32, and the outlet of the discharge pipe 314 is located between the separator cylinder 32 and the mixing tank 31.

[0025] The adjusting shaft 33 is embedded inside the proportioning box 31, and the distributing hopper 34 and the guide seat 35 are respectively fixedly installed on the lower outer side of the adjusting shaft 33. The adjusting shaft 33 is driven by an external rotating motor, which is located on the upper side of the proportioning box 31.

[0026] The upper sides of the dispensing hopper 34 and the separator cylinder 32 form an inclined surface, guiding alcohols to flow into the outer side of the separator cylinder 32. The dispensing hopper 34 includes a connecting plate 341, a guide plate 342, a guide ring 343, and a baffle 344. One side of the connecting plate 341 is fixedly connected to the outer side of the adjusting shaft 33, and the other side is fixedly connected to the upper end of the guide plate 342. The guide plate 342 has an inclined structure, with the inclined surface sloping downwards along the outer side of the adjusting shaft 33. A guide ring 343 is fixedly installed on the lower outer side of the guide plate 342, and the lower side of the guide ring 343 abuts against the upper edge of the separator cylinder 32. When feeding into the first mixing chamber 321, the inclined surface of the guide plate 342 is located below the feed pipe 313.

[0027] A channel is formed between the flow guide seat 35 and the feed pipe 313 to guide the alcohol into the inner side of the separator cylinder 32. The flow guide seat 35 includes a connecting rod 351 and a flow guide cylinder 352. One end of the connecting rod 351 is fixedly connected to the adjusting shaft 33, and the other end is fixedly connected to the flow guide cylinder 352. The flow guide cylinder 352 has a through-hole 353. The length of the connecting rod 351 is less than the inner diameter of the separator cylinder 32. When feeding into the second mixing chamber 322, the flow guide cylinder 352 is located below the feed pipe 313 so that the flow guide hole 353 is directly opposite the feed pipe 313.

[0028] A one-way shut-off valve 36 is fixedly mounted on the lower side wall of the partition cylinder 32. The one-way shut-off valve 36 connects the inner and outer sides of the partition cylinder 32 through a shut-off assembly 37. A flow-blocking ring 361 is fixedly provided on the outer side of the one-way shut-off valve 36. The shut-off assembly 37 includes a flow-blocking shaft 371 and an air pump. The flow-blocking shaft 371 is coaxially arranged with the one-way shut-off valve 36. A mating ring 372 is provided at one end of the flow-blocking shaft 371 near the one-way shut-off valve 36, and the other end is connected to the output end of the air pump to drive the flow-blocking shaft 371 to move axially horizontally. A seal is provided between the flow-blocking shaft 371 and the side wall of the mixing chamber 31. The flow-blocking ring 361 and the mating ring 372 can make a sealed contact to block the flow of alcohol in the second mixing chamber 322. When the feeding component 4 feeds materials, it first feeds the first mixing chamber 321 through the distributing hopper 34. The first mixing chamber 321 contains a pre-filled amount of base liquid, wherein the molar ratio of the alcohol base liquid to the phenylacetic acid in the phenylacetic acid storage tank 2 is 1:1. Then, it feeds the second mixing chamber 322 through the guide seat 35. The second mixing chamber 322 is pre-filled with the same alcohol as the first mixing chamber 321. After the first mixing chamber 321 is emptied, the second mixing chamber 322 transfers the alcohol to the first mixing chamber 321 through the one-way shut-off valve 36. The amount of excess alcohol added is selected according to the current reaction conversion rate. The amount of raw material in the mixing chamber is the sum of the product of the bottom area of ​​the mixing chamber and the height of the liquid surface.

[0029] The feeding assembly 4 includes a feeding disc 41, a rotating ring 42, and a feeding rod 43. The feeding disc 41 has several through holes, the size of which matches the outer diameter of the feed pipe 313, and the number of through holes matches the number of feed pipes 313. The feeding disc 41 is fixedly nested on the upper side of the mixing tank 31. A rotating motor is located at the center of the feeding disc 41, and the output end of the rotating motor is fixedly connected to the rotating ring 42 to drive the rotating ring 42 to rotate around the central axis of the feeding disc 41. One end of the feeding rod 43 is fixedly connected to the outer side of the rotating ring 42, and the upper side of the other end is connected to the feeding pipes for different alcohols. When feeding, the feeding pipes are connected to the feed pipes 313 to add raw materials into the mixing tank 31.

[0030] The feeding assembly 5 includes a first feeding pipe 51, a second feeding pipe 52, a branch pipe 53, and a feeding valve 54. The phenylacetic acid storage tank 2 and the reactor 1 are connected via the first feeding pipe 51. The branch pipe 53 is located below the mixing tank 31 and includes several branch pipes, the number of which is equal to the number of discharge pipes 33. Each branch pipe is connected to a corresponding discharge pipe 33, and a feeding valve 54 is correspondingly installed on the lower side of each discharge pipe 33. The branch pipe 53 is connected to the second feeding pipe 52, and the second feeding pipe 52 is connected to the reactor 1.

[0031] Working principle: During the feeding stage, the rotating ring 42 of the feeding component 4 rotates the receiving rod 43 onto the proportioning tank 31, so that each proportioning tank 31 is connected to a different alcohol feeding pipe, and different types of alcohol are added to different proportioning tanks 31 at the same time; for the same proportioning tank 31, when adding alcohol to the proportioning tank 31, firstly, the rotating motor drives the adjusting shaft 33 to rotate, and the rotating hopper 34 rotates to the lower side of the feed pipe 313, and the alcohol flows into the outer first proportioning chamber 3 through the inclined surface of the guide plate 342. Inside 21, after all the mixing tanks 31 have finished adding, the adjusting shaft 33 rotates so that the guide tube 352 is located below the feed pipe 313, so that the guide hole 353 is directly facing the feed pipe 313. The alcohol enters the inner second mixing chamber 322 through the guide tube 352. The first mixing chamber 321 is pre-filled with a certain amount of base liquid, and the ratio of the base liquid of the alcohol to the phenylacetic acid in the phenylacetic acid storage tank 2 is 1:1. The second mixing chamber 322 is pre-filled with the same alcohol as the first mixing chamber 321. During the production stage, a mixing chamber 31 is selected for production as needed until the raw materials in the first mixing chamber 321 are exhausted. The detection component monitors the reaction conversion rate in real time and controls the subsequent replenishment of alcohols based on the real-time conversion rate. The interception component 37 controls the one-way interception valve 36 to open, transferring the alcohols in the second mixing chamber 322 to the first mixing chamber 321. The replenishment of alcohols with different costs is controlled. This avoids raw material waste while improving the efficiency of raw material transportation, thereby improving the production efficiency of phenylacetic acid raw material ratio and feeding.

[0032] During the replenishment phase, after the raw materials are transported, the feeding component 4 replenishes the first proportioning chamber 321 of the idle proportioning box 31 with a certain amount of base liquid, and fills the second proportioning chamber 322.

Claims

1. A device for controlling the proportion of raw materials in the esterification reaction of oxyphenylacetic acid esters, characterized in that: The reactor includes a reaction vessel (1), a phenylacetic acid storage tank (2), a proportioning component (3), a feeding component (4), and a detection component. The phenylacetic acid storage tank (2) and the proportioning component (3) are respectively installed on the upper side of the reaction vessel (1), and the phenylacetic acid storage tank (2) and the proportioning component (3) are respectively connected to the reaction vessel (1) through pipelines. The feeding component (4) is set on the upper side of the phenylacetic acid storage tank (2) and the proportioning component (3) for adding alcohols. The proportioning component (3) includes at least one proportioning tank (31). The proportioning tank (31) is equipped with a proportioning mechanism, which includes at least two independent proportioning chambers, and the same alcohol is set in each of the different proportioning chambers. The detection component is set in the reaction vessel (1) for real-time detection of the reaction conversion rate.

2. The device for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 1, characterized in that: The proportioning mechanism includes a separator cylinder (32), an adjusting shaft (33), a distributing hopper (34), a guide seat (35), and a one-way shut-off valve (36); the separator cylinder (32) is fixedly and coaxially disposed inside the proportioning box (31); the upper part of the proportioning box (31) is connected to a feed pipe (313), and the lower part is connected to a discharge pipe (314); the outlet of the feed pipe (313) is located inside the separator cylinder (32), and the outlet of the discharge pipe (314) is located between the separator cylinder (32) and the proportioning box (31); the adjusting shaft (33) is embedded in the proportioning box (31). Inside, the distribution hopper (34) and the guide seat (35) are fixedly installed on the lower outer side of the adjusting shaft (33); the distribution hopper (34) and the upper side of the separator (32) form an inclined surface to guide the alcohol into the outer side of the separator (32); the guide seat (35) and the feed pipe (313) form a channel to guide the alcohol into the inner side of the separator (32); the one-way shut-off valve (36) is fixedly installed on the lower side wall of the separator (32), and the one-way shut-off valve (36) connects the inner and outer sides of the separator (32) through the shut-off assembly (37).

3. The device for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 2, characterized in that: The mixing tank (31) is fixedly provided with an upper cover plate (311) on the upper side and a lower cover plate (312) on the lower side; the lower side of the separator (32) is fixedly connected to the bottom of the mixing tank (31), the height of the separator (32) is lower than the height of the mixing tank (31), and there is a gap between the separator (32) and the upper part of the mixing tank (31); the inner side of the separator (32) forms a first mixing cavity (321), and the outer side of the separator (32) and the inner side of the mixing tank (31) form a second mixing cavity (322).

4. The device for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 3, characterized in that: The feeding hopper (34) includes a connecting plate (341), a guide plate (342), a guide ring (343), and a baffle (344). One side of the connecting plate (341) is fixedly connected to the outer side of the adjusting shaft (33), and the other side is fixedly connected to the upper end of the guide plate (342). The guide plate (342) is a sloped structure, and the sloped surface is inclined downward along the outer side of the adjusting shaft (33). A guide ring (343) is fixedly installed on the outer side of the lower end of the guide plate (342), and the lower side of the guide ring (343) abuts against the upper edge of the separator cylinder (32). When feeding into the first proportioning chamber (321), the sloped surface of the guide plate (342) is located below the feed pipe (313).

5. The device for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 3, characterized in that: The guide seat (35) includes a connecting rod (351) and a guide cylinder (352); one end of the connecting rod (351) is fixedly connected to the adjusting shaft (33), and the other end is fixedly connected to the guide cylinder (352); the guide cylinder (352) has a guide hole (353) that runs through it from top to bottom; the length of the connecting rod (351) is less than the inner diameter of the separator cylinder (32); when feeding material into the second proportioning chamber (322), the guide cylinder (352) is located below the feed pipe (313) so that the guide hole (353) is directly opposite the feed pipe (313).

6. The apparatus for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 3, characterized in that: A flow-blocking ring (361) is fixedly provided on the outside of the one-way shut-off valve (36); the shut-off assembly (37) includes a flow-blocking shaft (371) and an air pump. The flow-blocking shaft (371) is coaxially arranged with the one-way shut-off valve (36). A mating ring (372) is provided at one end of the flow-blocking shaft (371) near the one-way shut-off valve (36), and the other end is connected to the output end of the air pump to drive the flow-blocking shaft (371) to move horizontally in the axial direction; a sealing element is provided between the flow-blocking shaft (371) and the side wall of the mixing chamber (31); the flow-blocking ring (361) and the mating ring (372) can seal and fit in contact to block the alcohol in the second mixing chamber (322).

7. The apparatus for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 6, characterized in that: When the feeding component (4) feeds the material, a certain amount of base liquid is pre-feeded in the first mixing chamber (321), and the ratio of the base liquid of alcohol to the phenylacetic acid in the phenylacetic acid storage tank (2) is 1:1; the second mixing chamber (322) is pre-filled with the same alcohol as the first mixing chamber (321).

8. The apparatus for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 2, characterized in that: It includes multiple independent mixing tanks (31); the feeding assembly (4) includes a feeding tray (41), a rotating ring (42) and a feeding rod (43); the feeding tray (41) has several through holes, the size of which matches the outer diameter of the feed pipe (313), and the number of through holes matches the number of feed pipes (313). The feeding tray (41) is fixedly nested on the upper side of the mixing tank (31); a rotating motor is set in the center of the feeding tray (41), and the output end of the rotating motor is fixedly set with the rotating ring (42) to drive the rotating ring (42) to rotate around the central axis of the feeding tray (41); one end of the feeding rod (43) is fixedly connected to the outer side of the rotating ring (42), and the other end is connected to the feeding pipes of different alcohols on the upper side.

9. The apparatus for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 8, characterized in that: Different types of alcohols were added to different mixing tanks (31).

10. The apparatus for controlling the proportion of raw materials for the esterification reaction of oxyphenylacetic acid ester according to claim 1, characterized in that: It also includes a material guiding assembly (5), which includes a first material guiding pipe (51), a second material guiding pipe (52), a diversion pipe (53), and a material guiding valve (54); the phenylacetic acid storage tank (2) and the reactor (1) are connected by the first material guiding pipe (51); the diversion pipe (53) is located below the mixing tank (31), and the diversion pipe (53) includes several branch pipes, the number of which is equal to the number of discharge pipes (314); the branch pipes are connected to the discharge pipes (314) one by one, and a material guiding valve (54) is provided on the lower side of each discharge pipe (314); the diversion pipe (53) is connected to the second material guiding pipe (52), and the second material guiding pipe (52) is connected to the reactor (1).

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