Synthesis production device of diethyl oxalate

Abstract

The utility model relates to a synthesis production device of diethyl oxalate, which comprises an esterification reaction kettle body and a stirring structure, the stirring structure comprises a stirring motor, a stirring vertical shaft, an upper stirring paddle group and a lower stirring paddle group, and the kettle bottom of the esterification reaction kettle body is a conical bottom. The technical key points are as follows: the lower stirring paddle group consists of a connecting sleeve fixed at the lower end of the stirring vertical shaft, a plurality of connecting arms uniformly arranged on the periphery of the connecting sleeve, stirring blades arranged at the tail ends of the connecting arms and flexible scraping strips arranged at the lower edges of the stirring blades, the lower edges of the stirring blades are parallel to the generatrix of the cone bottom of the esterification reaction kettle body, and the flexible scraping strips are in contact with the cone bottom. The two ends of the flexible scraping strip extend to the upper edge and the lower edge of the cone bottom respectively, a discharging pipe is arranged at the lower end of the cone bottom, a hole is formed in one side of the discharging pipe and connected with an inlet pipeline of a lifting pump, a liquid separator is arranged in the top of the esterification reaction kettle body, and the tail end of an outlet pipeline of the lifting pump is connected with an inlet of the liquid separator. According to the device, the number of transmission parts is reduced, faults are reduced, and the maintenance workload is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical equipment, in particular to a synthesis production device for diethyl oxalate. Background Art

[0002] Diethyl oxalate is an important chemical raw material, which can be used in the synthesis of oxalamide, medicine, dye intermediates, plastic accelerators, etc. When producing diethyl oxalate, industrial oxalic acid and ethanol are generally used to carry out esterification reaction in an esterification reactor. Specifically, the raw materials are stirred after being put into the esterification reactor to make them fully react.

[0003] CN 220143400 U discloses a synthesis production line of diethyl oxalate, which includes a feeding device, an esterification reaction kettle, a stripping tower, a vacuum distillation tower and a receiving device, wherein the feeding device includes a feeding hopper, and the esterification reaction kettle includes a kettle body, wherein the inner top of the kettle body is provided with a first rotating shaft rotatably connected thereto, and the first rotating shaft is located on the outer side wall of one end of the kettle body and fixedly installed with a plurality of first stirring rods evenly arranged, and the inner walls on both sides of the kettle body are rotatably connected with a fourth rotating shaft located below the first rotating shaft. By stirring the solution with the first stirring rod in a reciprocating forward and reverse direction, the stirring effect is improved, the raw materials are mixed more evenly, the reaction is more sufficient, and the problem that the raw materials are easily accumulated at the bottom of the kettle body is solved. However, the following problems still exist during use: 1. The stirring structure of the esterification reaction kettle has many transmission parts, a high failure rate, and a large maintenance workload. Utility Model Content

[0004] The purpose of the utility model is to provide a synthetic production device for diethyl oxalate which has a reasonable structure and reliable use to solve the above problems, reduce the number of transmission parts, reduce failures and reduce maintenance workload.

[0005] The technical solution of the utility model is:

[0006] A synthetic production device for diethyl oxalate comprises an esterification reaction kettle body and a stirring structure, wherein the stirring structure comprises a stirring motor fixed at the center of the kettle top of the esterification reaction kettle body, a stirring vertical shaft arranged in the esterification reaction kettle body and connected to the output end of the stirring motor, an upper stirring paddle group and a lower stirring paddle group arranged on the stirring vertical shaft, the kettle bottom of the esterification reaction kettle body is a cone bottom, and the technical key points are: the lower stirring paddle group comprises a connecting sleeve fixed at the lower end of the stirring vertical shaft, a plurality of connecting arms evenly arranged on the outer periphery of the connecting sleeve, a stirring blade arranged at the end of the connecting arm, and a flexible scraper arranged at the lower edge of the stirring blade, the lower edge of the stirring blade is parallel to the generatrix of the cone bottom of the esterification reaction kettle body, the flexible scraper contacts the cone bottom, and the two ends of the flexible scraper extend to the upper edge and the lower edge of the cone bottom respectively, the lower end of the cone bottom is provided with a discharge pipe, one side of the discharge pipe is opened and connected to the inlet pipeline of a lifting pump, a liquid separator is built in the top of the esterification reaction kettle body, and the end of the outlet pipeline of the lifting pump is connected to the inlet of the liquid separator.

[0007] The above-mentioned diethyl oxalate synthesis production device, the liquid separator includes an annular liquid inlet cavity, the center line of the annular liquid inlet cavity coincides with the center line of the stirring vertical shaft, and the lower surface of the annular liquid inlet cavity is evenly provided with a plurality of liquid separation holes, and the liquid separation holes are located directly above the upper stirring paddle group.

[0008] In the above-mentioned diethyl oxalate synthesis production device, the upper stirring paddle group is composed of a plurality of upper stirring paddles fixedly spaced along the length direction of the stirring vertical shaft, and two adjacent upper stirring paddles are arranged in a staggered manner.

[0009] In the above-mentioned synthetic production device for diethyl oxalate, a connecting plate is provided on the upper edge of the stirring blade of the lower stirring paddle group, the connecting arm is a multi-claw structure, the end of the multi-claw structure is fixedly connected to the connecting plate, and a plurality of hollow holes are provided on the stirring blade.

[0010] In the above-mentioned synthetic production device for diethyl oxalate, a sealing plate is provided at the lower end of the discharge pipe, a switching valve core is provided in the discharge pipe, the top surface of the switching valve core is a conical top surface, and a screw is connected to the center of the bottom surface, a screw sleeve is provided in the center of the sealing plate to cooperate with the screw, a spring is sleeved on the screw section between the switching valve core and the sealing plate, a handle is provided at the lower end of the screw, a circulation channel for connecting the esterification reaction kettle body and the inlet pipeline of the lifting pump is provided in the switching valve core, a longitudinal groove is provided on the lower side wall of the switching valve core, a discharge pipeline connected to the longitudinal groove is provided on the side wall of the discharge pipe, and control valves are respectively provided on the inlet pipeline and the discharge pipeline of the lifting pump.

[0011] The beneficial effects of the utility model are:

[0012] 1. Only the stirring motor and the stirring shaft are used to drive the upper stirring paddle group and the lower stirring paddle group to rotate simultaneously, so as to achieve uniform stirring of the solution in the esterification reaction kettle and its bottom. The flexible scraper of the lower stirring paddle group is used to contact the cone bottom to avoid the accumulation of materials at the bottom of the kettle. The flexible scraper picks up the materials to participate in the reaction, ensuring a more complete and thorough reaction. The utility model has fewer transmission parts, reduces the failure rate of the device, and reduces the maintenance workload.

[0013] 2. During the stirring process, a lifting pump is used to extract the material at the bottom of the esterification reaction kettle, and then it flows back to the upper part of the kettle through a liquid separator, thereby enhancing the stirring effect, enhancing the reaction effect, and improving the reaction efficiency.

[0014] 3. Use the switching valve core to block the discharge pipe to prevent the material from entering the discharge pipe before discharging, ensuring that the material fully participates in the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 yes Figure 1 A partial enlarged view of .

[0017] In the figure: 1. stirring motor, 2. esterification reaction kettle body, 3. liquid separator, 4. outlet pipeline, 5. upper stirring paddle group, 6. connecting arm, 7. connecting plate, 8. stirring blade, 9. flexible scraper, 10. lifting pump, 11. inlet pipeline, 12. sealing plate, 13. screw sleeve, 14. handle, 15. spring, 16. screw, 17. discharge pipeline, 18. cone bottom, 19. liquid separation hole, 20. circulation channel, 21. longitudinal groove, 22. switching valve core, 23. discharge pipe. DETAILED DESCRIPTION

[0018] The utility model is described in detail according to the accompanying drawings of the specification.

[0019] like Figure 1 , Figure 2 As shown, the synthetic production device of diethyl oxalate comprises an esterification reaction kettle 2 and a stirring structure. The stirring structure comprises a stirring motor 1 fixed to the top center of the esterification reaction kettle 2, a stirring vertical shaft arranged in the esterification reaction kettle 2 and connected to the output end of the stirring motor 1, an upper stirring paddle group 5 and a lower stirring paddle group arranged on the stirring vertical shaft. The bottom of the esterification reaction kettle 2 is a conical bottom 18.

[0020] Wherein, the lower stirring paddle group is composed of a connecting sleeve fixed to the lower end of the stirring vertical shaft, a plurality of connecting arms 6 evenly arranged on the outer periphery of the connecting sleeve, a stirring blade 8 arranged at the end of the connecting arm 6, and a flexible scraper 9 arranged at the lower edge of the stirring blade 8. The lower edge of the stirring blade 8 is parallel to the generatrix of the cone bottom of the esterification reaction kettle body 2, and the flexible scraper 9 is in contact with the cone bottom 18, and the two ends of the flexible scraper 9 extend to the upper and lower edges of the cone bottom 18 respectively. In this embodiment, a connecting plate 7 is provided on the upper edge of the stirring blade 8 of the lower stirring paddle group, and the connecting arm 6 is a multi-claw structure, and the end of the multi-claw structure is connected and fixed to the connecting plate 7, and a plurality of hollow holes are provided on the stirring blade 8. The upper stirring paddle group 5 is composed of a plurality of upper stirring paddles fixed at intervals along the length direction of the stirring vertical shaft, and two adjacent upper stirring paddles are arranged alternately.

[0021] The lower end of the cone bottom 18 is provided with a discharge pipe 23, one side of which is opened and connected to the inlet pipe 11 of the lifting pump 10, and the top of the esterification reaction kettle body 2 is built with a liquid separator 3, and the end of the outlet pipe 4 of the lifting pump 10 is connected to the inlet of the liquid separator 3. In this embodiment, the liquid separator 3 includes an annular liquid inlet cavity, the center line of which coincides with the center line of the stirring vertical shaft, and a plurality of liquid separation holes 19 are evenly arranged on the lower surface of the annular liquid inlet cavity, and the liquid separation holes 19 are located directly above the upper stirring paddle group 5.

[0022] A sealing plate 12 is provided at the lower end of the discharge pipe 23, and a switching valve core 22 is provided in the discharge pipe 23. The top surface of the switching valve core 22 is a conical top surface, and a screw 16 is connected to the center of the bottom surface. A screw sleeve 13 cooperating with the screw 16 is provided in the center of the sealing plate 12. The screw 16 is sleeved with a spring 15 on the screw section between the switching valve core 22 and the sealing plate 12, and a handle 14 is provided at the lower end of the screw 16. A circulation channel 20 for connecting the esterification reaction kettle body 2 and the inlet pipeline 11 of the lifting pump 10 is provided in the switching valve core 22. A longitudinal groove 21 is provided on the lower side wall of the switching valve core 22, and a discharge pipeline 17 connected to the longitudinal groove 21 is provided on the side wall of the discharge pipe 23. Control valves are respectively provided on the inlet pipeline 11 and the discharge pipeline 17 of the lifting pump 10.

[0023] Working principle:

[0024] Materials are added into the esterification reaction kettle body 2 through the feed port (omitted in the figure), and the stirring motor 1 is started to drive the stirring vertical shaft and the upper and lower stirring paddle groups to rotate. At the same time, the lifting pump 10 is started, and the materials at the bottom of the esterification reaction kettle body 2 enter the inlet pipeline 11 of the lifting pump 10 through the circulation channel 20 of the switching valve core 22, and then fall into the upper layer of the materials through the outlet pipeline 4 of the lifting pump 10 and the liquid separation hole 19 of the liquid separator 3, so as to achieve the purpose of circulating and participating in the reaction.

[0025] After the reaction is completed, the screw 16 is rotated by using the handle 14. With the help of the spring 15, the top surface of the switching valve core 22 rises, and the longitudinal groove 21 on the lower side wall of the switching valve core 22 is connected with the esterification reaction kettle body 2. The material flows to the unloading pipeline 17 through the longitudinal groove 21 to achieve the purpose of unloading.

[0026] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A synthetic production device for diethyl oxalate, comprising an esterification reaction kettle and a stirring structure, wherein the stirring structure comprises a stirring motor fixed to the top center of the esterification reaction kettle, a stirring vertical shaft arranged in the esterification reaction kettle and connected to the output end of the stirring motor, an upper stirring paddle group and a lower stirring paddle group arranged on the stirring vertical shaft, the bottom of the esterification reaction kettle is a cone bottom, characterized in that: The lower stirring paddle group consists of a connecting sleeve fixed to the lower end of the stirring vertical shaft, a plurality of connecting arms evenly arranged on the outer periphery of the connecting sleeve, a stirring blade arranged at the end of the connecting arm, and a flexible scraper arranged at the lower edge of the stirring blade. The lower edge of the stirring blade is parallel to the generatrix of the conical bottom of the esterification reaction kettle body, the flexible scraper is in contact with the conical bottom, and the two ends of the flexible scraper extend to the upper and lower edges of the conical bottom respectively. A discharge pipe is provided at the lower end of the conical bottom, and a hole is opened on one side of the discharge pipe and connected to the inlet pipeline of the lifting pump. A liquid separator is built into the top of the esterification reaction kettle body, and the end of the outlet pipeline of the lifting pump is connected to the inlet of the liquid separator.

2. The synthetic production device of diethyl oxalate according to claim 1, characterized in that: The liquid separator comprises an annular liquid inlet cavity, the center line of which coincides with the center line of the stirring vertical shaft, and a plurality of liquid separation holes are evenly arranged on the lower surface of the annular liquid inlet cavity, and the liquid separation holes are located directly above the upper stirring paddle group.

3. The synthetic production device of diethyl oxalate according to claim 1, characterized in that: The upper stirring paddle group is composed of a plurality of upper stirring paddles fixed at intervals along the length direction of the stirring vertical shaft, and two adjacent upper stirring paddles are arranged alternately.

4. The synthetic production device of diethyl oxalate according to claim 1, characterized in that: A connecting plate is provided on the upper edge of the stirring blade of the lower stirring paddle group, the connecting arm is a multi-claw structure, the end of the multi-claw structure is connected and fixed to the connecting plate, and a plurality of hollow holes are provided on the stirring blade.

5. The synthetic production device of diethyl oxalate according to claim 1, characterized in that: A sealing plate is provided at the lower end of the discharge pipe, and a switching valve core is provided in the discharge pipe. The top surface of the switching valve core is a conical top surface, and a screw is connected to the center of the bottom surface. A screw sleeve matching the screw is provided in the center of the sealing plate. A spring is sleeved on the screw section between the switching valve core and the sealing plate, and a handle is provided at the lower end of the screw. A circulation channel for connecting the esterification reaction kettle body and the inlet pipeline of the lifting pump is provided in the switching valve core, a longitudinal groove is provided on the lower side wall of the switching valve core, and a discharge pipeline connected to the longitudinal groove is provided on the side wall of the discharge pipe. Control valves are respectively provided on the inlet pipeline and the discharge pipeline of the lifting pump.

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