An apparatus for obtaining oxophenylacetic acid esters by vacuum distillation

Abstract

This invention relates to the field of chemical preparation, specifically to an apparatus for obtaining oxyphenylacetic acid esters by vacuum distillation. The apparatus includes a vacuum distillation mechanism, comprising a connector. One end of the connector is fitted with a round-bottom flask. A temperature control mechanism is inserted into the outer wall of the round-bottom flask. A distillation head is fixedly connected to the outer wall of the connector near one end. A thermometer is fixedly connected to the top of the distillation head. A condenser is fixedly connected to the outer wall of the distillation head. A receiving bottle is inserted into one end of the condenser. A pressure-resistant tube is fixedly connected to the outer wall of one end of the condenser. A compression fixing mechanism is inserted into one end of the pressure-resistant tube. In this invention, a ring frame is provided inside the heating mantle near the center below. When a ring frame moves into the heating mantle, it will fit against the ring frame. The heat generated by the heating wire will pass through the ring frame, preventing some heat from bypassing the ring frame and affecting the cooling efficiency, thus effectively improving operational stability.

Description

Technical Field

[0001] This invention relates to the field of chemical purification, and specifically to an apparatus for obtaining oxophenylacetic acid ester by vacuum distillation. Background Technology

[0002] In the field of chemical synthesis, methyl oxophenylacetate and ethyl oxophenylacetate are important organic intermediates widely used in the synthesis of various products such as pharmaceuticals, fragrances, and pesticides. Traditional vacuum distillation is an effective method for obtaining high-purity oxophenylacetate.

[0003] Existing vacuum distillation apparatuses generally use a heating mantle to heat the distillation flask. While this heating method allows for control of the heating rate and temperature by adjusting the current, it has significant limitations. This is especially true when a rapid temperature drop to a specified level is needed to prevent compound decomposition or side reactions. Furthermore, existing apparatuses typically use screw clamps to secure the pressure-resistant tubes and glass tubing. Although these clamps provide necessary stability, their installation and removal are cumbersome, requiring manual twisting of each clamp, which undoubtedly increases preparation and completion time, impacting experimental efficiency. Summary of the Invention

[0004] To overcome the aforementioned technical problems, the present invention aims to provide an apparatus for obtaining oxyphenylacetic acid ester by vacuum distillation. This apparatus includes a ring frame 1, which, when a ring frame 3 moves into the heating mantle, will fit against the ring frame 1. All heat generated by the heating wire will pass through the ring frame 3, preventing some heat from bypassing the ring frame 3 and affecting cooling efficiency, thus effectively improving operational stability. Furthermore, the presence of an exhaust pipe allows the generated water vapor to be discharged through the exhaust pipe, preventing water vapor from remaining inside the heating mantle and increasing internal humidity, thereby effectively improving environmental control capabilities and operational stability.

[0005] An apparatus for obtaining oxyphenylacetic acid ester by vacuum distillation includes a vacuum distillation mechanism. The vacuum distillation mechanism includes a connector, one end of which is snapped with a round-bottom flask. A temperature regulating mechanism is inserted into the outer wall of the round-bottom flask. A distillation head is fixedly connected to the connector near one end of the outer wall. A thermometer is fixedly connected to the top of the distillation head. A condenser is fixedly connected to the outer wall of the distillation head. A receiving bottle is inserted into one end of the condenser. A pressure-resistant tube is fixedly connected to the outer wall of one end of the condenser. A compression fixing mechanism is inserted into one end of the pressure-resistant tube.

[0006] The temperature control mechanism includes an electric heating mantle, the top of which is inserted into the outer wall of a round-bottom flask. A square hole is provided on the outer wall of the electric heating mantle at one of its centers. A ring frame is fixedly connected inside the electric heating mantle near the square hole. A heating wire is fixedly connected inside the electric heating mantle near the bottom.

[0007] Furthermore, several air outlet pipes are fixedly connected at equal angles around the axis of the outer wall of the heating sleeve near the center.

[0008] Preferably, the outer wall of the air outlet pipe is provided with a square hole II, and a number of square rods I are fixedly connected at equal angles around the axis of the outer wall of the electric heating sleeve near the position of the air outlet pipe. An L-shaped frame I is slidably inserted between the outer walls of two square rods I, and a ring frame II is fixedly connected between the outer walls of several L-shaped frames I. The outer wall of the L-shaped frame I is inserted into the square hole II.

[0009] Preferably, the outer wall of the ring frame is fixedly connected to an arc-shaped frame, the outer wall of the arc-shaped frame is slidably inserted into the outer wall of the heating sleeve, the outer wall of the arc-shaped frame is provided with an inclined groove at the lower center, and the outer wall of the arc-shaped frame is provided with a square hole at the upper center.

[0010] Preferably, an arc-shaped block is slidably inserted into the interior of both sides of the arc-shaped frame, a spring telescopic rod is fixedly connected between the outer wall of the arc-shaped block and the inner wall of the arc-shaped frame, an inclined block is fixedly connected to one side of the outer wall of the arc-shaped block, and a set of square grooves are opened on both sides of the square hole on the outer wall of the electric heating sleeve, and the outer wall of the inclined block is slidably inserted into the square groove.

[0011] Preferably: an L-shaped frame two is fixedly connected to the bottom end of the outer wall of the electric heating sleeve, an electric telescopic rod is fixedly connected to the outer wall of the L-shaped frame two, a ring frame three is fixedly connected to the outer wall of one end of the electric telescopic rod, an inclined block three is fixedly connected to the outer wall of the ring frame three, inclined blocks two are fixedly connected to both sides of the outer wall of the ring frame three, and a sponge block one is fixedly connected inside the ring frame three.

[0012] Preferably: a cylinder is fixedly connected to the outer wall of the L-shaped frame two near the center position. Two square rods are fixedly connected to the outer wall of the cylinder two at equal angles around its axis. A cylinder two is fixedly connected between the outer walls of the two square rods two. A sponge block two is fixedly connected inside the cylinder two. A circular hole is opened on the bottom wall of the cylinder two. A circular plate is slidably inserted into the cylinder two. A water inlet is fixedly connected to the outer wall of the circular plate.

[0013] Preferably, the extrusion fixing mechanism includes a square shell, a T-shaped limiting seat is fixedly connected inside the square shell, a support frame is fixedly connected to both sides of the bottom wall of the square shell, and a T-shaped glass tube is snapped into the outer wall of the T-shaped limiting seat.

[0014] Preferably, the outer wall of the T-shaped glass tube is inserted into the inner wall of the pressure-resistant tube, the outer wall of the square shell is provided with an annular groove at the center, an airbag is fixedly connected inside the annular groove, and a number of square holes are provided at equal angles around the axis of the annular groove, and T-shaped blocks are slidably inserted into the square holes.

[0015] The beneficial effects of this invention are:

[0016] 1. The heating mantle is inserted into the outer wall of the round-bottom flask. A square hole is provided on the outer wall of the heating mantle at the center side. A ring frame is fixedly connected inside the heating mantle near the square hole. A heating wire is fixedly connected inside the heating mantle near the bottom. By setting the ring frame at the lower center position inside the heating mantle, when the ring frame moves into the heating mantle, it will fit with the ring frame. The heat generated by the heating wire will pass through the ring frame, avoiding some heat from not passing through the ring frame and affecting the cooling efficiency, thus effectively improving the working stability.

[0017] 2. Several vent pipes are fixedly connected at equal angles around the axis of the outer wall of the heating jacket near the center. By setting the vent pipes, the generated water vapor can be discharged through the vent pipes, avoiding water vapor from staying inside the heating jacket, increasing the internal humidity, and effectively improving the environmental control capability and working stability.

[0018] 3. A square hole 2 is provided on the outer wall of the air outlet pipe. Several sets of square rods 1 are fixedly connected at equal angles around the axis of the outer wall of the heating jacket near the position of the air outlet pipe. An L-shaped frame 1 is slidably inserted between the outer walls of two square rods 1. A ring frame 2 is fixedly connected between the outer walls of several L-shaped frames 1. The outer wall of the L-shaped frame 1 is inserted into the square hole 2. When cooling is required, the ring frame 3 enters to separate the L-shaped frame 1 from the square hole 2, open the air outlet pipe, and discharge water vapor. When cooling is not required, the L-shaped frame 1 is inserted into the square hole 2 to reduce internal heat diffusion and improve heating efficiency. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the temperature control mechanism in this invention;

[0022] Figure 3 This is a schematic diagram of the electric heating jacket structure in this invention;

[0023] Figure 4 This is a schematic diagram of the cross-sectional structure of the heating jacket in this invention;

[0024] Figure 5 This is a schematic diagram of a partial structure of the heating mantle in this invention;

[0025] Figure 6 This is a schematic diagram of the structure of the heating sleeve from another angle in this invention;

[0026] Figure 7This is a partial structural diagram of the temperature control mechanism in this invention;

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of cylinder one and cylinder two in this invention;

[0028] Figure 9 This is a schematic diagram of the extrusion fixing mechanism in this invention;

[0029] Figure 10 This is a schematic diagram of a partial structure of the shell in this invention.

[0030] In the diagram: 100, vacuum distillation mechanism; 110, connector; 111, distillation head; 112, thermometer; 120, condenser; 121, receiving flask; 122, pressure-resistant tube; 130, round-bottom flask; 200, temperature control mechanism; 210, heating mantle; 211, square rod one; 212, gas outlet pipe; 213, square hole one; 214, square groove; 215, square hole two; 216, ring frame one; 220, heating wire; 230, ring frame two; 231, L-shaped frame one; 232, arc-shaped frame; 233, square hole three; 234, inclined groove; 235, arc-shaped block; 236, inclined... Block 1; 237. Spring telescopic rod; 240. L-shaped frame 2; 241. Electric telescopic rod; 242. Ring frame 3; 243. Inclined block 2; 244. Inclined block 3; 245. Sponge block 1; 250. Cylinder 1; 251. Square rod 2; 252. Cylinder 2; 253. Round hole; 254. Sponge block 2; 255. Round plate; 256. Water inlet; 300. Extrusion fixing mechanism; 310. Square shell; 311. Support frame; 312. Ring groove; 313. Airbag; 314. Square hole 4; 315. T-shaped block; 320. T-shaped limit seat; 321. T-shaped glass tube. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1-10As shown, an apparatus for obtaining oxyphenylacetic acid esters by vacuum distillation includes a vacuum distillation mechanism 100. The vacuum distillation mechanism 100 includes a connector 110, one end of which is snapped with a round-bottom flask 130. A temperature regulating mechanism 200 is inserted into the outer wall of the round-bottom flask 130. A distillation head 111 is fixedly connected to one end of the connector 110 near its outer wall. A thermometer 112 is fixedly connected to the top of the distillation head 111. A condenser 120 is fixedly connected to the outer wall of the distillation head 111. A receiving bottle 121 is inserted into one end of the condenser 120. A heat-resistant... The pressure tube 122 has a compression fixing mechanism 300 inserted at one end. The temperature control mechanism 200 includes an electric heating mantle 210. The top of the electric heating mantle 210 is inserted into the outer wall of the round-bottom flask 130. A square hole 213 is opened on the outer wall of the electric heating mantle 210 at the center side. A ring frame 216 is fixedly connected inside the electric heating mantle 210 near the square hole 213. An electric heating wire 220 is fixedly connected inside the electric heating mantle 210 near the bottom. Several gas outlet pipes 212 are fixedly connected at equal angles around the axis of the outer wall of the electric heating mantle 210 near the center side.

[0033] A square hole 215 is provided on the outer wall of the vent pipe 212. Several sets of square rods 211 are fixedly connected at equal angles around the axis of the outer wall of the heating sleeve 210 near the vent pipe 212. One end of an L-shaped frame 231 is slidably inserted between the outer walls of two square rods 211. A ring frame 230 is fixedly connected between the outer walls of several L-shaped frames 231. The outer wall of one end of the L-shaped frame 231 is inserted into the square hole 215. An arc-shaped frame 232 is fixedly connected to the outer wall of the ring frame 230. The outer wall of the arc-shaped frame 232 is slidably inserted into the outer wall of the heating sleeve 210. An inclined groove 234 is provided on the outer wall of the arc-shaped frame 232 below the center, and a square hole 233 is provided on the outer wall of the arc-shaped frame 232 above the center. Arc-shaped blocks 235 are slidably inserted into the inner sides of the arc-shaped frame 232. A spring telescopic rod 237 is fixedly connected between the outer wall of the arc-shaped block 235 and the inner wall of the arc-shaped frame 232. An inclined block 236 is fixedly connected to one side of the outer wall of the arc-shaped block 235. A set of square grooves 214 are provided on both sides of the square hole 213 on the outer wall of the electric heating sleeve 210. The outer wall of the inclined block 236 is slidably inserted into the square groove 214.

[0034] An L-shaped frame 240 is fixedly connected to the bottom of the outer wall of the electric heating jacket 210. An electric telescopic rod 241 is fixedly connected to the outer wall of the L-shaped frame 240. A ring frame 242 is fixedly connected to the outer wall of one end of the electric telescopic rod 241. An inclined block 244 is fixedly connected to the outer wall of the ring frame 242. An inclined block 243 is fixedly connected to both sides of the electric telescopic rod 241 on the outer wall of the ring frame 242. A sponge block 245 is fixedly connected inside the ring frame 242. A cylinder 250 is fixedly connected to the outer wall of the L-shaped frame 240 near the center. Two square rods 251 are fixedly connected to the outer wall of the cylinder 250 at equal angles around its axis. A cylinder 252 is fixedly connected between the outer walls of the two square rods 251. A sponge block 254 is fixedly connected inside the cylinder 252. The bottom wall of the second cylinder 252 has a circular hole 253. A circular plate 255 is slidably inserted into the inside of the second cylinder 252. A water inlet 256 is fixedly connected to the outer wall of the circular plate 255. The extrusion fixing mechanism 300 includes a square shell 310. A T-shaped limiting seat 320 is fixedly connected inside the square shell 310. Support frames 311 are fixedly connected to both sides of the bottom wall of the square shell 310. A T-shaped glass tube 321 is snapped into the outer wall of the T-shaped limiting seat 320. The outer wall of the T-shaped glass tube 321 is inserted into the inner wall of the pressure-resistant tube 122. An annular groove 312 is opened at the center of the outer wall of the square shell 310. An air bladder 313 is fixedly connected inside the annular groove 312. Several square holes 314 are opened at equal angles around the axis of the annular groove 312. T-shaped blocks 315 are slidably inserted into the square holes 314.

[0035] Specifically, during operation, the round-bottom flask 130 is heated by the heating wire 220. When cooling is required, the operator presses the circular plate 255, causing some of the water stored inside the sponge block 254 to be discharged and fall onto the inclined block 244, where it is absorbed. The electric telescopic rod 241 drives the ring frame 242 to move towards the heating sleeve 210 until the inclined block 244 contacts the inclined groove 234. The arc-shaped frame 232 is squeezed and slides towards the joint 110. The ring frame 242 enters the heating sleeve 210 through the square hole 213 and fits against the ring frame 216. L-shaped frame 231 is separated from square hole 215 by sliding ring frame 230. The heat generated by the heating wire 220 passes through ring frame 242, and the generated water vapor is sprayed out from the vent pipe 212 for cooling. When cooling is not needed, the electric telescopic rod 241 drives ring frame 242 to move outward from heating jacket 210, and inclined block 243 disengages from inclined block 236, causing arc frame 232 to be squeezed and slide towards joint 110. Ring frame 242 slides out along square hole 213. After sliding out, arc frame 232 returns to its original position. The square hole 213 is blocked, and the L-shaped frame 231 returns to its original position and is inserted into the square hole 215, reducing the heat diffusion inside the heating mantle 210. The electric telescopic rod 241 then moves the ring frame 242 to its original position. Personnel press the circular plate 255, causing water droplets inside the sponge block 254 to fall onto the inclined block 244, preparing for the next cooling operation. When it is necessary to disassemble the pressure-resistant tube 122 and the T-shaped glass tube 321 for cleaning, simply remove the cap 333, allowing the air inside the airbag 313 to escape, and the pressure-resistant tube 122 will no longer be squeezed by the T-shaped block 315. The T-shaped glass tube 321 can be pulled out from one end. The T-shaped glass tube 321 can also be removed from the T-shaped limiting seat 320. When it is necessary to fix the pressure-resistant tube 122 and the T-shaped glass tube 321, the operator inserts one end of the inflatable ball into 333, squeezes the inflatable ball to send air into the airbag 313 until it is full, and then covers the seal of 333. The T-shaped block 315 is pressed tightly against the outer wall of the pressure-resistant tube 122 by the airbag 313, thus fixing the pressure-resistant tube 122 and the T-shaped glass tube 321. The sponge block 245 can be made of high-temperature resistant materials such as foamed polyurethane and ceramic fiber.

[0036] Example 1

[0037] like Figure 2-4As shown, in this embodiment, several vent pipes 212 are fixedly connected at equal angles around the axis of the outer wall of the heating sleeve 210 near the center. Square holes 215 are formed on the outer wall of each vent pipe 212. Several sets of square rods 211 are fixedly connected at equal angles around the axis of the outer wall of the heating sleeve 210 near the vent pipes 212. One end of an L-shaped frame 231 is slidably inserted between the outer walls of two square rods 211. Ring frames 230 are fixedly connected between the outer walls of several L-shaped frames 231. The outer wall of one end of the L-shaped frame 231 is inserted into the square hole 215. An arc-shaped frame 2 is fixedly connected to the outer wall of the ring frame 230. 32. The outer wall of the arc-shaped frame 232 is slidably inserted into the outer wall of the heating sleeve 210. The outer wall of the arc-shaped frame 232 has a slanted groove 234 at the lower center and a square hole 233 at the upper center. Arc-shaped blocks 235 are slidably inserted into the inner sides of the arc-shaped frame 232. A spring telescopic rod 237 is fixedly connected between the outer wall of the arc block 235 and the inner wall of the arc-shaped frame 232. A slanted block 236 is fixedly connected to one side of the outer wall of the arc block 235. A set of square grooves 214 are opened on both sides of the square hole 213 on the outer wall of the heating sleeve 210. The outer wall of the slanted block 236 is slidably inserted into the square groove 214.

[0038] In this embodiment, these structures can completely block the gaps on the heating mantle 210 when cooling is not required, reducing heat loss and effectively improving heating efficiency. Furthermore, they eliminate the need for manual pushing, preventing burns or collisions with other structures, reducing labor intensity, and improving work stability.

[0039] like Figure 7 As shown, in this embodiment, an L-shaped frame 240 is fixedly connected to the bottom of the outer wall of the heating sleeve 210. An electric telescopic rod 241 is fixedly connected to the outer wall of the L-shaped frame 240. A ring frame 242 is fixedly connected to the outer wall of one end of the electric telescopic rod 241. An inclined block 244 is fixedly connected to the outer wall of the ring frame 242. An inclined block 243 is fixedly connected to both sides of the outer wall of the ring frame 242 on both sides of the electric telescopic rod 241. A sponge block 245 is fixedly connected inside the ring frame 242.

[0040] In practice, the electric telescopic rod 241 receives instructions to drive the ring frame 242 to move, which reduces human intervention, improves the accuracy of the insertion of the ring frame 242 and the square hole 213, and can drive the ring frame 242 to move quickly into the electric heating jacket 210, effectively improving the cooling efficiency.

[0041] Example 2

[0042] like Figure 9-10As shown, in this embodiment, the compression fixing mechanism 300 includes a square shell 310. A T-shaped limiting seat 320 is fixedly connected inside the square shell 310. Support frames 311 are fixedly connected to both sides of the bottom wall of the square shell 310. A T-shaped glass tube 321 is snapped into the outer wall of the T-shaped limiting seat 320. The outer wall of the T-shaped glass tube 321 is inserted into the inner wall of the pressure-resistant tube 122. An annular groove 312 is opened at the center of the outer wall of the square shell 310. An airbag 313 is fixedly connected inside the annular groove 312. A plurality of square holes 314 are opened at equal angles around its axis on the inner wall of the annular groove 312. T-shaped blocks 315 are slidably inserted into the square holes 314.

[0043] In practice, the pressure-resistant tube 122 and the T-shaped glass tube 321 can be quickly fixed or disassembled by the compression fixing mechanism 300, eliminating the need to fix or disassemble them one by one, which greatly improves the efficiency and convenience of assembly and disassembly.

[0044] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structural material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structural materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined in the claims, all of which should fall within the protection scope of the present invention.

Claims

1. An apparatus for obtaining oxyphenylacetic acid ester by vacuum distillation, characterized in that, The device includes a vacuum distillation mechanism (100), which includes a connector (110). One end of the connector (110) is snapped with a round-bottom flask (130). A temperature control mechanism (200) is inserted into the outer wall of the round-bottom flask (130). A distillation head (111) is fixedly connected to one end of the connector (110) near the outer wall. A thermometer (112) is fixedly connected to the top of the distillation head (111). A condenser (120) is fixedly connected to the outer wall of the distillation head (111). A receiving bottle (121) is inserted into one end of the condenser (120). A pressure-resistant tube (122) is fixedly connected to the outer wall of one end of the condenser (120). A compression fixing mechanism (300) is inserted into one end of the pressure-resistant tube (122). The temperature control mechanism (200) includes an electric heating mantle (210), the top of which is inserted into the outer wall of the round-bottom flask (130). A square hole (213) is provided on the outer wall of the electric heating mantle (210) at one side of the center. A ring frame (216) is fixedly connected inside the electric heating mantle (210) near the square hole (213). A heating wire (220) is fixedly connected inside the electric heating mantle (210) near the bottom. The outer wall of the electric heating sleeve (210) is fixedly connected to the bottom end of the L-shaped frame two (240), the outer wall of the L-shaped frame two (240) is fixedly connected to the electric telescopic rod (241), the outer wall of one end of the electric telescopic rod (241) is fixedly connected to the ring frame three (242), the outer wall of the ring frame three (242) is fixedly connected to the inclined block three (244), the outer wall of the ring frame three (242) is fixedly connected to both sides of the electric telescopic rod (241) with the inclined block two (243), and the inner wall of the ring frame three (242) is fixedly connected to the sponge block one (245). A cylindrical first (250) is fixedly connected to the outer wall of the L-shaped frame two (240) near the center position. Two square rods two (251) are fixedly connected to the outer wall of the cylindrical first (250) at equal angles around its axis. A cylindrical second (252) is fixedly connected between the outer walls of the two square rods two (251). A sponge block two (254) is fixedly connected inside the cylindrical second (252). A circular hole (253) is opened on the bottom wall of the cylindrical second (252). A circular plate (255) is slidably inserted inside the cylindrical second (252). A water inlet (256) is fixedly connected to the outer wall of the circular plate (255).

2. The apparatus for obtaining oxyphenylacetic acid ester by vacuum distillation according to claim 1, characterized in that, Several air outlet pipes (212) are fixedly connected at equal angles around the axis of the outer wall of the electric heating jacket (210) near the center.

3. The apparatus for obtaining oxyphenylacetic acid ester by vacuum distillation according to claim 2, characterized in that, The outer wall of the air outlet pipe (212) is provided with a square hole two (215). The outer wall of the electric heating sleeve (210) is fixedly connected with several sets of square rods one (211) at equal angles around its axis near the position of the air outlet pipe (212). One end of an L-shaped frame one (231) is slidably inserted between the outer walls of two square rods one (211). A ring frame two (230) is fixedly connected between the outer walls of several L-shaped frames one (231). The outer wall of one end of the L-shaped frame one (231) is inserted into the square hole two (215).

4. The apparatus for obtaining oxophenylacetic acid ester by vacuum distillation according to claim 3, characterized in that, The outer wall of the ring frame two (230) is fixedly connected to an arc frame (232). The outer wall of the arc frame (232) is slidably inserted into the outer wall of the heating sleeve (210). An inclined groove (234) is opened on the outer wall of the arc frame (232) below the center. A square hole three (233) is opened on the outer wall of the arc frame (232) above the center.

5. The apparatus for obtaining oxyphenylacetic acid ester by vacuum distillation according to claim 4, characterized in that, Arc-shaped blocks (235) are slidably inserted into the interior of both sides of the arc-shaped frame (232). A spring telescopic rod (237) is fixedly connected between the outer wall of the arc-shaped block (235) and the inner wall of the arc-shaped frame (232). An inclined block (236) is fixedly connected to the outer wall of one side of the arc-shaped block (235). A set of square grooves (214) are opened on both sides of the square hole (213) on the outer wall of the electric heating sleeve (210). The outer wall of the inclined block (236) is slidably inserted into the square groove (214).

6. The apparatus for obtaining oxyphenylacetic acid ester by vacuum distillation according to claim 1, characterized in that, The extrusion fixing mechanism (300) includes a square shell (310), a T-shaped limiting seat (320) is fixedly connected inside the square shell (310), and a support frame (311) is fixedly connected to both sides of the bottom wall of the square shell (310). A T-shaped glass tube (321) is snapped onto the outer wall of the T-shaped limiting seat (320).

7. The apparatus for obtaining oxyphenylacetic acid ester by vacuum distillation according to claim 6, characterized in that, The outer wall of the T-shaped glass tube (321) is inserted into the inner wall of the pressure-resistant tube (122). The outer wall of the square shell (310) is provided with an annular groove (312) at the center. An airbag (313) is fixedly connected inside the annular groove (312). Several square holes (314) are provided at equal angles around its axis on the inner wall of the annular groove (312). A T-shaped block (315) is slidably inserted into the square holes (314).

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