CN114671773A - A kind of high-yield cyclic acid synthesis method - Google Patents

Abstract

The invention belongs to the technical field of cyclic acid synthesis, in particular to a high-yield cyclic acid synthesis method. In view of the fact that the current reaction kettle lacks a special catalytic hydrogenation structure, the reaction time after hydrogen is added is long, and the hydrogenation effect is not good, the following scheme is now proposed. , add the sulfuric acid solution of 5-7% mass fraction, platinum-based catalyst and pretreated aminotoluic acid from the feed port of the synthesis mechanism into the reactor body according to the weight ratio of 2:1:6, and close the reactor body After the heating plate is energized, the electric heating rod heats the solution in the reactor body. When the temperature of the reaction liquid reaches the preset temperature, the motor drives the shaft to rotate, and the stirring component mixes and stirs the reaction liquid.

Description

A kind of high-yield cyclic acid synthesis method

technical field

The invention relates to the technical field of cyclic acid synthesis, in particular to a high-yield cyclic acid synthesis method.

Background technique

Tranexamic acid, also known as tranexamic acid, tranexamic acid, hemostatic acid, molecular formula is C8H15NO2, chemical name is trans-4-aminomethylcyclohexanecarboxylic acid, it is a white crystalline powder, odorless, slight taste, in Soluble in water, almost insoluble in ethanol, acetone, chloroform or ether.

Tranexamic acid has a wide range of effects in medicine and pharmacy. It can safely and reliably reduce the mortality rate of traumatic hemorrhage patients; it can reduce the possibility of progressive bleeding in patients with craniocerebral brain; it can significantly reduce blood loss in women with excessive menstrual bleeding It can significantly reduce the amount of postpartum hemorrhage; it can reduce the risk of postoperative blood transfusion and reduce the amount of intraoperative and postoperative bleeding, and can be used for the adjuvant treatment of factor VIII deficiency hemophilia patients before and after surgery. Spot removal effect.

Tranexamic acid needs to carry out catalytic hydrogenation on the semi-finished product in the production and processing process to obtain the desired hydrogenated product. Usually this process is carried out in a reaction kettle. However, due to the lack of a special catalytic hydrogenation structure in the current reaction kettle, after hydrogen is added The reaction time is long and the hydrogenation effect is not good.

SUMMARY OF THE INVENTION

A kind of high-yield cyclic acid synthesis method proposed by the present invention comprises the following steps:

A high-yield cyclic acid synthesis method, comprising the following steps:

Step 1: Mix aminotoluic acid and pure water in a weight ratio of 1:5, slowly add concentrated sulfuric acid under stirring conditions, heat to a preset temperature, dissolve aminotoluic acid, crystallize by cooling, and filter to obtain pretreated aminotoluic acid , then add 5-7% mass fraction of sulfuric acid solution, platinum-based catalyst and pretreated aminotoluic acid from the feed port of the synthesis mechanism into the reactor body according to the weight ratio of 2:1:6, and close the reactor. The feed port of the body, the starting device;

Step 2: After the heating plate is energized, the electric heating rod heats the solution in the reactor body, and after the temperature of the reaction solution reaches the preset temperature, the motor drives the shaft to rotate, and the stirring component mixes and stirs the reaction solution;

During the specific stirring process, with the rotation of the hexagonal shaft seat, the stirring rod is subjected to the reverse force of the internal reaction liquid and the driving force of the rotation of the shaft rod. The contact effect with the reaction liquid improves the overall stirring and mixing effect of the stirring component;

Step 3: transport hydrogen from the gas inlet pipe to the inside of the reactor body, close the valve of the gas inlet pipe after transporting a certain amount of hydrogen to make a hydrogenated product, then add the calcium hydroxide of the hydrogenated product weight ratio: : , and continue the reaction treatment;

In the process of hydrogen delivery, hydrogen enters the return gas seat and is ejected from the air hole, and acts directly on the reaction solution. The hydrogen forms bubbles in the reaction solution, which increases the contact effect between the gas and the reaction solution, and improves the effect of catalytic hydrogenation. Micro air pump The work uses the suction pipe and the gas inlet groove to inhale the inside of the reactor body, and enters the return gas seat through the gas pipe, and sprays out from the air hole. The circulation improves the contact effect of the hydrogen and the reaction liquid. The exhaust pipe valve discharges the gas inside the reactor, and then discharges the reacted solution for subsequent transposition reaction;

Step 4: During the catalytic hydrogenation reaction, hydrogen is introduced into the reactor, the internal pressure will increase, and the effect of the catalytic hydrogenation reaction will be reduced, and the pressure regulating component can change the pressure inside the reactor body. The control valve will perform an exhaust operation to discharge the gas in the air bag to the outside, the air bag will shrink in volume in the air cylinder, push the bottom plate to move upward, and the return spring will receive the reverse force after elastic deformation to assist the push bottom plate to reset, and then complete High yield cyclic acid synthesis;

The synthesis mechanism includes a reaction kettle body, the interior of the reaction kettle body is provided with a gas return component, and the gas return component includes a gas return seat and a gas ring, and an outer wall of one side of the gas return seat is fixedly connected with the inner wall of the reactor body. , and the air return seat is provided with an exhaust plate, and the exhaust plate is provided with a plurality of air holes at equal distances around the circumference. The air ring is located above the air return seat, and the air ring is fixedly connected with the inner wall of the reactor body. And the air ring is provided with a plurality of circular holes that are equidistant around the circumference, the inner wall of the circular holes is fixedly connected with a suction pipe, and the other end of the suction pipe is fixedly connected with an air inlet groove, and the air ring and the return air seat are fixed. Two gas delivery pipes are fixedly connected between the two gas delivery pipes, and a micro air pump is arranged on the two gas delivery pipes.

Preferably, an air inlet pipe is fixedly connected to the air return seat, the other end of the air inlet pipe is fixedly connected to the outside air pipe through the reactor body, and the reactor body is provided with a circular hole, and the circular hole is located above the gas ring, An exhaust pipe is fixedly connected to the inner wall of the round hole.

Preferably, the outer wall of the reactor body is fixedly connected with three supports that are equidistant around the circumference, and support legs are fixedly connected to the supports, and the top of the reactor body is provided with a top cover, and the bottom of the reactor body is provided with The bottom box is provided with a leak hole, and the inner wall of the leak hole is fixedly connected with a discharge pipe.

Preferably, the inside of the reaction kettle body is provided with a temperature control assembly, the temperature control assembly is located below the air return seat, the temperature control assembly includes a heating plate and a spiral temperature regulating pipe, and the heating plate is fixedly connected to the inner wall of the reaction kettle body. , a plurality of electric heating rods with equidistant circumferences are arranged on the heating plate, and two circular holes are opened on the reactor body. The inner walls of the two circular holes are respectively fixed with a water inlet pipe and a water outlet pipe. Both ends of the spiral thermostat are fixedly connected.

Preferably, a frame is fixedly connected to the upper outer wall of the top cover, a motor is fixedly connected to the inner wall of the frame, an output end of the motor is connected to a shaft through a coupling, and the other end of the shaft passes through the top cover, The outside of the shaft is provided with a stirring component, and the top cover is provided with a feeding port.

Preferably, the stirring assembly includes a hexagonal shaft seat and a plurality of support rods, the hexagonal shaft seat is provided with a hexagonal groove, the inner wall of the hexagonal groove and the outer wall of the shaft rod are fixedly connected, and the plurality of support rods are connected to the hexagonal shaft. The seats are fixedly connected, and a plurality of struts are distributed at equal distances around the circumference.

Preferably, three equidistant circular holes are formed on each of the plurality of supporting rods, the inner walls of the three circular holes are fixedly connected with spring bases, and the top ends of the spring bases are fixedly connected with stirring rods.

Preferably, the top cover is provided with two symmetrical air relief holes, and the inside of the two air relief holes are provided with pressure regulating components.

Preferably, the pressure regulating assembly includes an air cylinder and an air bag, the outer wall of the air cylinder and the inner wall of the air outlet are fixedly connected, and the air bag is located inside the air cylinder, and the top of the air cylinder is fixedly connected with an air flow control valve, between the air control valve and the air bag Connect by short tube.

Preferably, the inside of the airbag is provided with a pushing bottom plate, the inner wall of the top of the airbag is fixedly connected with an inner attachment seat, the lower side outer wall of the inner attachment seat is fixedly connected with a return spring, and the other end of the return spring is between the pushing bottom plate and the inner attachment seat. Fixed connection.

The beneficial effects in the present invention are:

1. In the present invention, the reactor body, the gas return seat, the gas ring, the exhaust plate, the air hole, the suction, the air inlet groove, the gas transmission pipe and the micro air pump are provided, and the device can directly transport the input hydrogen by using the gas return component. into the reaction liquid, thereby generating bubbles to increase the contact effect between the hydrogen and the reaction liquid. At the same time, during the reaction process, the gas in the reaction kettle body is repeatedly transported to the reaction liquid by using a micro air pump, which further improves the delivery of hydrogen to the reaction kettle body. The reaction effect between the latter and the internal reaction solution; during the hydrogen delivery process, the hydrogen enters the return gas seat and is ejected from the air hole, and acts directly on the reaction solution, and the hydrogen forms bubbles in the reaction solution, which further increases the relationship between the gas and the reaction solution. The contact effect between the two, thereby improving the catalytic hydrogenation effect.

2. In the present invention, the solution in the reactor body is heated by the electric heating rod after the heating plate is energized, so that the temperature of the liquid to be reacted reaches the preset temperature and meets the conditions required for the reaction. Warm liquid (water), with the prolongation of the reaction time or the excessive heating of the heating plate, the temperature of the reaction liquid exceeds the preset value, the water is input from the water inlet pipe, and the water outlet pipe is sent out, and the reaction liquid is cooled to avoid the influence of excessive temperature. the overall process of the reaction.

3. In the present invention, a stirring assembly is provided, the motor drives the shaft to rotate, and the stirring assembly mixes and stirs the reaction liquid; during the stirring process, with the rotation of the hexagonal shaft seat, the stirring rod is subjected to the reverse force of the internal reaction liquid and the shaft rod. With the driving force of rotation, the spring base will shake and drive the stirring rod to vibrate. During the vibration process, the stirring rod can increase the contact effect with the reaction liquid, thereby improving the overall stirring and mixing effect of the stirring assembly.

4. During the catalytic hydrogenation reaction, the pressure inside the reactor will increase due to the introduction of hydrogen into the reactor, so that the effect of the catalytic hydrogenation reaction will decrease (the solubility of hydrogen decreases after the pressure increases). , and the pressure regulating component can change the pressure inside the reactor body. When the hydrogen is introduced, the air flow control valve will perform an exhaust operation to discharge the gas in the air bag to the outside (the air bag is initially filled with outside air to expand it. ), the air bag shrinks in the air cylinder, pushes the bottom plate to move upward, and the return spring receives the reverse force after elastic deformation to assist the push bottom plate to reset.

Description of drawings

Fig. 1 is the overall structural representation of a kind of high-yield cyclic acid synthesis method proposed by the present invention;

Fig. 2 is the structural representation of the gas return component of a kind of high-yield cyclic acid synthesis method proposed by the present invention;

Fig. 3 is the gas ring structure schematic diagram of a kind of high-yield cyclic acid synthesis method proposed by the present invention;

4 is a schematic structural diagram of a temperature control assembly of a high-yield cyclic acid synthesis method proposed by the present invention;

Fig. 5 is the sectional structure schematic diagram of the reactor body of a kind of high-yield cyclic acid synthesis method proposed by the present invention;

6 is a schematic structural diagram of a stirring assembly of a high-yield cyclic acid synthesis method proposed by the present invention;

Fig. 7 is the top-cap structure schematic diagram of a kind of high-yield cyclic acid synthesis method proposed by the present invention;

8 is a schematic structural diagram of a pressure regulating assembly of a high-yield cyclic acid synthesis method proposed by the present invention.

In the figure: 1. Reactor body; 2. Air return seat; 3. Air ring; 4. Exhaust plate; 5. Air hole; 6. Suction pipe; Air pump; 10. Intake pipe; 11. Exhaust pipe; 12. Support; 13. Support leg; 14. Top cover; 15. Bottom box; 16. Discharge pipe; 17. Heating plate; 18. Spiral thermostat ;19, electric heating rod; 20, water inlet pipe; 21, water outlet pipe; 22, frame; 23, electric motor; 24, shaft rod; 25, feed inlet; 26, hexagonal shaft seat; 27, strut; 28, spring Base; 29, stirring rod; 30, overflow hole; 31, air cylinder; 32, air bag; 33, air flow control valve; 34, push bottom plate; 35, attached seat; 36, return spring.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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, but not all of the embodiments.

A high-yield cyclic acid synthesis method, comprising the following steps:

Step 1: Mix aminotoluic acid and pure water in a weight ratio of 1:5, slowly add concentrated sulfuric acid under stirring conditions, heat to a preset temperature, dissolve aminotoluic acid, crystallize by cooling, and filter to obtain pretreated aminotoluic acid , then add 5-7% mass fraction of sulfuric acid solution, platinum-based catalyst and pretreated aminotoluic acid from the feed port 25 of the synthesis mechanism into the reactor body 1 according to the weight ratio of 2:1:6, and close the The feed port 25 of the reactor body 1, the startup device;

Step 2: After the heating plate 17 is energized, the electric heating rod 19 heats the solution in the reaction kettle body 1. After the temperature of the reaction solution reaches the preset temperature, the motor 23 drives the shaft 24 to rotate, and the stirring component mixes and stirs the reaction solution;

During the specific stirring process, with the rotation of the hexagonal shaft seat 26, the stirring rod 29 is subjected to the reverse force of the internal reaction solution and the driving force of the rotation of the shaft rod 24, and the spring base (28 will shake to drive the stirring rod 29 to vibrate, and the vibration process The middle stirring rod 29 can increase the contact effect with the reaction liquid and improve the overall stirring and mixing effect of the stirring assembly;

Step 3: transport hydrogen from the inlet pipe 10 to the interior of the reactor body 1, close the valve of the inlet pipe 10 after transporting a certain amount of hydrogen to make a hydrogenated product, and then add calcium hydroxide with a weight ratio of 1:6 of the hydrogenated product, continue reaction processing;

During the hydrogen delivery process, the hydrogen gas enters the return gas seat 2 and is ejected from the air hole 5, and acts directly on the reaction solution. The hydrogen gas forms bubbles in the reaction solution, which increases the contact effect between the gas and the reaction solution and improves the catalytic hydrogenation effect. The micro air pump 9 works by using the air suction pipe 6 and the air inlet groove 7 to inhale the inside of the reactor body 1, and enters the air return seat 2 through the air delivery pipe 8, and ejects from the air hole 5, and the circulation improves the hydrogen and the reaction in this way. The contact effect of the liquid, after the reaction ends, open the valve of the exhaust pipe 11 to discharge the gas inside the reactor, and then discharge the reacted solution for subsequent transposition reaction;

Step 4: During the catalytic hydrogenation reaction, hydrogen is introduced into the reactor, the internal pressure will increase, the effect of the catalytic hydrogenation reaction will be reduced, and the pressure regulating component can change the pressure inside the reactor body 1. When the hydrogen is introduced, The air flow control valve 33 will perform an exhaust operation to discharge the gas in the air bag 32 to the outside. The air bag 32 shrinks in the air cylinder 31 and pushes the bottom plate 34 to move upward. The return spring 36 is assisted by the reverse force after elastic deformation. Push the bottom plate 36 to reset, and then complete the high-yield cyclic acid synthesis; as shown in Figure 1, Figure 2 and Figure 3, including the reactor body 1, the interior of the reactor body 1 is provided with a gas return component, and the gas return component Including the gas return seat 2 and the gas ring 3, the outer wall of one side of the gas return seat 2 and the inner wall of the reactor body 1 are connected by bolts, and the gas return seat 2 is provided with an exhaust plate 4, and the exhaust plate 4 is in the shape of a circle. There are a plurality of air holes 5 equidistantly, the air ring 3 is located above the air return seat 2, the air ring 3 and the inner wall of the reactor body 1 are connected by bolts, and the air ring 3 is provided with a plurality of equidistant circumferentially. A round hole, the inner wall of the round hole is connected with an air intake pipe 6 by bolts, the other end of the air intake pipe 6 is connected with an air intake groove 7 by bolts, and the air ring 3 and the air return seat 2 are connected by bolts. Gas pipe 8, and two gas transmission pipes 8 are provided with micro air pump 9. During the hydrogen delivery process, hydrogen gas enters the gas return seat 2 and is ejected from the air hole 5, and directly acts on the reaction solution, and the hydrogen gas forms bubbles in the reaction solution, The contact effect between the gas and the reaction liquid is further increased, thereby improving the catalytic hydrogenation effect.

Further, as shown in FIG. 2 , the air return seat 2 is connected with an air inlet pipe 10 by bolts, and the other end of the air inlet pipe 10 passes through the reactor body 1 and is connected with the outside air pipe by bolts, and the reactor body 1 is provided with The circular hole is located above the gas ring 3, and the inner wall of the circular hole is connected with an exhaust pipe 11 by bolts; The support legs 13 are connected by bolts, a top cover 14 is provided above the reactor body 1, and a bottom box 15 is provided below the reactor body 1. The bottom box 15 is provided with a leak hole, and the inner wall of the leak hole is connected by bolts. Discharge pipe 16.

Further, as shown in FIG. 1 and FIG. 4 , the inside of the reactor body 1 is provided with a temperature control assembly, the temperature control assembly is located below the return air seat 2, and the temperature control assembly includes a heating plate 17 and a spiral temperature adjustment pipe 18, The heating plate 17 and the inner wall of the reactor body 1 are connected by bolts. The heating plate 17 is provided with a plurality of electric heating rods 19 with equidistant circumferences, and the reactor body 1 is provided with two circular holes. The inner wall is respectively connected with the water inlet pipe 20 and the water outlet pipe 21 by bolts, and the water inlet pipe 20 and the water outlet pipe 21 are respectively connected with the two ends of the spiral temperature regulating pipe 18 by bolts. The solution is heated so that the temperature of the liquid to be reacted reaches the preset temperature and meets the conditions required for the reaction. The temperature-adjusting liquid (water) is introduced into the spiral temperature-adjusting tube 18. As the reaction time increases or the heating plate 17 is overheated, the reaction When the temperature of the liquid exceeds the preset value, water is input from the water inlet pipe 20 and sent out from the water outlet pipe 21, and the reaction liquid is cooled down to avoid the overheating affecting the overall process of the reaction.

Further, as shown in FIG. 5 and FIG. 6 , the upper outer wall of the top cover 14 is connected with a frame 22 by bolts, the inner wall of the frame 22 is connected with a motor 23 by bolts, and the output end of the motor 23 is connected by a coupling. There is a shaft rod 24, and the other end of the shaft rod 24 passes through the top cover 14. A stirring assembly is provided on the outside of the shaft rod 24, and a feeding port 25 is opened on the top cover 14; the stirring assembly includes a hexagonal shaft seat 26 and a plurality of supports The rod 27 and the hexagonal shaft seat 26 are provided with a hexagonal groove, the inner wall of the hexagonal groove and the outer wall of the shaft rod 24 are connected by bolts, and the plurality of struts 27 and the hexagonal shaft seat 26 are connected by bolts, and many The struts 27 are distributed at equal distances around the circumference; the multiple struts 27 are provided with three equidistant circular holes, the inner walls of the three circular holes are all connected with a spring base 28 by bolts, and the tops of the spring bases 28 are all connected by bolts There is a stirring rod 29. During the stirring process, with the rotation of the hexagonal shaft seat 26, the stirring rod 29 is subjected to the reverse force of the internal reaction liquid and the driving force of the rotation of the shaft rod 24, and the spring base 28 will shake and drive the stirring rod 29 to vibrate. , during the vibration process, the stirring rod 29 can increase the contact effect with the reaction liquid, thereby improving the overall stirring and mixing effect of the stirring assembly.

Further, as shown in FIG. 7 and FIG. 8 , the top cover 14 is provided with two symmetrical overflow holes 30, and the inside of the two overflow holes 30 are provided with pressure regulating components; the pressure regulating components include an air cylinder 31 and an air bag. 32. The outer wall of the air cylinder 31 is connected with the inner wall of the overflow hole 30 by bolts, and the air bag 32 is located inside the air cylinder 31. The top of the air cylinder 31 is connected with an air flow control valve 33 by bolts, and the air flow control valve 33 and the air bag 32 pass through. Short pipe connection; the inside of the airbag 32 is provided with a pushing bottom plate 34, and the top inner wall of the airbag 32 is connected with an inner attachment seat 35 by bolts, and the lower side outer wall of the inner attachment seat 35 is connected with a return spring 36 by bolts. The other end is connected with the pushing bottom plate 34 by bolts. During the catalytic hydrogenation reaction, due to the introduction of hydrogen into the reactor, the internal pressure will increase, so that the effect of the catalytic hydrogenation reaction will be reduced (the solubility of hydrogen after the pressure increases). lower), and the pressure regulating component can change the pressure inside the reactor body 1. When the hydrogen gas is introduced, the airflow control valve 33 will perform an exhaust operation to discharge the gas in the air bag 32 to the outside (initially, the air bag 32 is filled with The outside air makes it expand), the air bag 32 shrinks in the air cylinder 31, pushes the bottom plate 34 to move upward, and the return spring 36 receives the reverse force after elastic deformation to assist the push bottom plate 34 to reset.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. The equivalent replacement or change of the inventive concept thereof shall be included within the protection scope of the present invention.

Claims (10)

1. A high-yield cyclic acid synthesis method is characterized by comprising the following steps:

the method comprises the following steps: mixing aminomethylbenzoic acid and pure water according to a weight ratio of 1:5, slowly adding concentrated sulfuric acid under stirring, heating to a preset temperature, dissolving the aminomethylbenzoic acid, cooling for crystallization, filtering to obtain pretreated aminomethylbenzoic acid, then adding a sulfuric acid solution with a mass fraction of 5-7%, a platinum catalyst and the pretreated aminomethylbenzoic acid into a reaction kettle body (1) from a feed inlet (25) of a synthesis mechanism according to a weight ratio of 2:1:6, closing the feed inlet (25) of the reaction kettle body (1), and starting a device;

step two: after the heating plate (17) is electrified, the electric heating rod (19) heats the solution in the reaction kettle body (1), after the temperature of the reaction liquid reaches a preset temperature, the motor (23) drives the shaft lever (24) to rotate, and the stirring assembly mixes and stirs the reaction liquid;

in the concrete stirring process, along with the rotation of the hexagonal shaft seat (26), the stirring rod (29) receives the reverse acting force of the internal reaction liquid and the driving force of the rotation of the shaft lever (24), the spring base (28) can shake to drive the stirring rod (29) to vibrate, the stirring rod (29) can increase the contact effect with the reaction liquid in the vibration process, and the overall stirring and mixing effect of the stirring assembly is improved;

step three: conveying hydrogen from an air inlet pipe (10) to the interior of the reaction kettle body (1), closing a valve of the air inlet pipe (10) after conveying quantitative hydrogen to prepare a hydrogenation product, then adding calcium hydroxide with the weight ratio of the hydrogenation product being 1:6, and continuing reaction treatment;

during the hydrogen conveying process, hydrogen enters the gas return seat (2) and is sprayed out of the gas holes (5) to directly act on reaction solution, the hydrogen forms bubbles in the reaction solution, the contact effect between the gas and the reaction solution is increased, the catalytic hydrogenation effect is improved, the miniature gas pump (9) works by utilizing the gas suction pipe (6) and the gas inlet groove (7) to suck gas into the reaction kettle body (1), the gas enters the gas return seat (2) through the gas conveying pipe (8), the hydrogen is sprayed out of the gas holes (5), the contact effect between the hydrogen and the reaction solution is circularly improved, after the reaction is finished, the valve of the exhaust pipe (11) is opened to exhaust the gas in the reaction kettle, and then the reacted solution is exhausted to perform subsequent transposition reaction;

step four: during the catalytic hydrogenation reaction, inside the reation kettle lets in hydrogen, inside pressure can increase, catalytic hydrogenation reaction's effect can reduce, and the pressure regulating subassembly can change the inside pressure of reation kettle body (1), after hydrogen lets in, air current control valve (33) can carry out the exhaust operation, outwards discharge the gas in gasbag (32), gasbag (32) shrink volume in inflator (31), bulldoze bottom plate (34) rebound, reset spring (36) receive the reverse effort behind the elastic deformation to assist and bulldoze bottom plate (36) and reset, and then accomplish high yield's cyclic acid synthesis.

2. The method for synthesizing the high-yield naphthenic acid according to claim 1, wherein the synthesis mechanism comprises a reaction kettle body (1), a gas return assembly is arranged inside the reaction kettle body (1), the gas return assembly comprises a gas return seat (2) and a gas ring (3), the outer wall of one side of the gas return seat (2) is fixedly connected with the inner wall of the reaction kettle body (1), an exhaust plate (4) is arranged on the gas return seat (2), a plurality of gas holes (5) are formed in the exhaust plate (4) at equal intervals on the circumference, the gas ring (3) is positioned above the gas return seat (2), the gas ring (3) is fixedly connected with the inner wall of the reaction kettle body (1), a plurality of circular holes at equal intervals on the circumference are formed in the gas ring (3), a gas suction pipe (6) is fixedly connected with the inner wall of the circular hole, and a gas inlet groove (7) is fixedly connected with the other end of the gas suction pipe (6), two air pipes (8) are fixedly connected between the air ring (3) and the air return seat (2), and a micro air pump (9) is arranged on each of the two air pipes (8).

3. The method for synthesizing the cyclic acid with high yield according to claim 2, wherein the gas inlet pipe (10) is fixedly connected to the gas return base (2), the other end of the gas inlet pipe (10) penetrates through the reaction kettle body (1) to be fixedly connected with an external gas pipe, a circular hole is formed in the reaction kettle body (1), the circular hole is located above the gas ring (3), and an exhaust pipe (11) is fixedly connected to the inner wall of the circular hole.

4. The method for synthesizing the high-yield cyclic acid according to claim 3, wherein three supports (12) with equal intervals in the circumference are fixedly connected to the outer wall of the reaction kettle body (1), the supports (12) are all fixedly connected with supporting legs (13), a top cover (14) is arranged above the reaction kettle body (1), a bottom box (15) is arranged below the reaction kettle body (1), a leakage hole is formed in the bottom box (15), and a discharge pipe (16) is fixedly connected to the inner wall of the leakage hole.

5. The method for synthesizing the high-yield naphthenic acid according to claim 4, wherein a temperature control assembly is arranged inside the reaction kettle body (1), the temperature control assembly is located below the gas return seat (2), the temperature control assembly comprises a heating plate (17) and a spiral temperature adjusting pipe (18), the heating plate (17) is fixedly connected with the inner wall of the reaction kettle body (1), a plurality of electric heating rods (19) with equal circumferential distances are arranged on the heating plate (17), two round holes are formed in the reaction kettle body (1), the inner walls of the two round holes are respectively and fixedly connected with a water inlet pipe (20) and a water outlet pipe (21), and the water inlet pipe (20) and the water outlet pipe (21) are respectively and fixedly connected with two ends of the spiral temperature adjusting pipe (18).

6. The method for synthesizing the high-yield naphthenic acid according to claim 2, wherein a rack (22) is fixedly connected to the outer wall of the upper side of the top cover (14), a motor (23) is fixedly connected to the inner wall of the rack (22), the output end of the motor (23) is connected with a shaft rod (24) through a coupling, the other end of the shaft rod (24) penetrates through the top cover (14), a stirring assembly is arranged outside the shaft rod (24), and a feeding hole (25) is formed in the top cover (14).

7. The method for synthesizing high-yield naphthenic acid according to claim 6, wherein the stirring assembly comprises a hexagonal shaft seat (26) and a plurality of struts (27), the hexagonal shaft seat (26) is provided with a hexagonal groove, the inner wall of the hexagonal groove is fixedly connected with the outer wall of the shaft rod (24), the plurality of struts (27) are fixedly connected with the hexagonal shaft seat (26), and the plurality of struts (27) are circumferentially distributed at equal intervals.

8. The method for synthesizing the cyclic acid with high yield according to claim 7, wherein three circular holes with equal distance are formed on the plurality of the supporting rods (27), the inner walls of the three circular holes are fixedly connected with spring bases (28), and the top ends of the spring bases (28) are fixedly connected with stirring rods (29).

9. The method for synthesizing the cyclic acid with high yield according to claim 8, wherein the top cover (14) is provided with two symmetrical air overflow holes (30), and pressure regulating components are arranged inside the two air overflow holes (30).

10. The method for synthesizing the cyclic acid with high yield according to claim 9, wherein the pressure regulating assembly comprises a gas cylinder (31) and a gas bag (32), the outer wall of the gas cylinder (31) is fixedly connected with the inner wall of the gas overflow hole (30), the gas bag (32) is positioned inside the gas cylinder (31), the top of the gas cylinder (31) is fixedly connected with a gas flow control valve (33), and the gas flow control valve (33) is connected with the gas bag (32) through a short pipe; the inner part of the air bag (32) is provided with a pushing and pressing bottom plate (34), an inner attached seat (35) is fixedly connected to the inner wall of the top of the air bag (32), a return spring (36) is fixedly connected to the outer wall of the lower side of the inner attached seat (35), and the other end of the return spring (36) is fixedly connected with the pushing and pressing bottom plate (34).

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