Rectifying still for preparing o-methylphenylacetic acid and using method thereof

Abstract

The invention belongs to the technical field of rectifying kettles, and particularly relates to a rectifying kettle for preparing o-methylphenylacetic acid and a use method of the rectifying kettle. Comprising a kettle body, one side of the kettle body is provided with a first heat exchanger and a reboiler, the first heat exchanger is located above the reboiler, the other side of the kettle body is sequentially provided with a condenser, a third heat exchanger and a second heat exchanger from top to bottom, the side wall of the kettle body is provided with a feeding pipe, the feeding pipe is communicated with the first heat exchanger, and the second heat exchanger is communicated with the second heat exchanger. A discharge pipe is arranged at the bottom of the kettle body and is communicated with the heat exchanger II and the reboiler; the rotating shaft is driven by the motor to rotate, so that the first gas circulation assembly and the second gas circulation assembly slowly rotate along with the rotating shaft, liquid layers on the first tower plate and the second tower plate are stirred, the flowing speed and the mixing degree of a liquid phase are increased, steam can be uniformly dispersed in the liquid layers, the steam phase and the liquid phase can be in full contact, and the liquid phase and the liquid phase can be uniformly dispersed. And mass transfer and heat transfer between the gas phase and the liquid phase are further promoted.

Description

Technical Field

[0001] The invention belongs to the technical field of distillation kettles, in particular to a distillation kettle for producing o-methylphenylacetic acid and a use method thereof. Background Art

[0002] o-Toluacetic acid is a white or light yellow block crystal. As an organic synthesis intermediate, it is mainly used in the synthesis of fungicides, such as oxathiocarb, picoxystrobin, and fenoxystrobin. In summary, o-Toluacetic acid is an important organic compound and is widely used in the chemical industry. The preparation method of o-Toluacetic acid includes the following steps: esterification reaction, static stratification, distillation and purification, alkaline hydrolysis, and pH adjustment. By using the above method in combination with special reaction equipment such as a distillation kettle, the reaction speed can be increased, the reaction time can be shortened, and the product yield is high.

[0003] In the prior art, the vapor rising channel in the distillation equipment usually adopts a bubble cap or a float valve structure. The bubble cap structure is composed of a riser and a bubble cap, and the float valve structure replaces the riser and the bubble cap with a float valve, both of which are fixed on the tower plate. These structures are fixed on the tower plate as monomers, and the contact between the steam and the liquid layer on the tower plate is promoted by increasing the distribution number to realize the mass transfer and heat transfer process of the vapor-liquid two-phase. However, since the monomers in this structure are fixed, each monomer can only radiate a limited area around it, resulting in uneven vapor-liquid mixing, and areas with low mass transfer and heat transfer efficiency are prone to appear.

[0004] To this end, the present invention provides a rectifying kettle for producing o-methylphenylacetic acid and a method for using the same. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art and solve the problem that in the prior art, the vapor phase ascending channel in the distillation equipment usually adopts a bubble cap or a float valve structure, the bubble cap structure is composed of a riser and a bubble cap, and the float valve structure replaces the riser and the bubble cap with a float valve, both of which are fixed on the tower plate, and these structures are all fixed on the tower plate by monomers, and the contact between the steam and the liquid layer on the tower plate is promoted by increasing the distribution number to realize the mass transfer and heat transfer process of the vapor-liquid two phases. However, due to the fixed monomers of this structure, each monomer can only radiate a limited area around it, resulting in uneven vapor-liquid mixing, and the problem of areas with low mass transfer and heat transfer efficiency is prone to appear. The present invention provides a distillation kettle for producing o-methylphenylacetic acid and a method for using the same.

[0006] The technical solution applicable to the present invention for solving the technical problem is: a distillation kettle for producing o-methylphenylacetic acid, comprising a kettle body, one side of the kettle body is provided with a heat exchanger 1 and a reboiler, the heat exchanger 1 is located above the reboiler, the other side of the kettle body is provided with a condenser, a heat exchanger 3 and a heat exchanger 2 in sequence from top to bottom, a feed pipe is provided on the side wall of the kettle body, the feed pipe is connected to the heat exchanger 1, a discharge pipe is provided at the bottom of the kettle body, the discharge pipe is connected to both the heat exchanger 2 and the reboiler, the condenser is connected to the top of the kettle body, the heat exchanger 3 is connected to the top of the side wall of the kettle body The kettle body is connected to the inner cavity, and a plurality of tower plates 1 and 2 are alternately arranged in the inner cavity of the kettle body, a gas circulation component 1 is arranged on the tower plate 1, and a gas circulation component 2 is arranged on the tower plate 2. A skirt is fixedly connected to the bottom of the kettle body, a mounting plate is fixedly connected to the inner side wall of the skirt, a motor is fixedly installed on the top of the mounting plate, a rotating shaft is fixedly connected to the output end of the motor, the top end of the rotating shaft extends into the inner cavity of the kettle body and is connected to the gas circulation component 1 and the gas circulation component 2, the rotating shaft is sealed and rotatably connected to the discharge pipe, and a plurality of cavities 1 and cavities 2 are alternately arranged inside the rotating shaft.

[0007] Preferably, the tower plate 1 is composed of a circular plate, an annular weir plate 1 and an annular frame, the annular weir plate 1 is fixed on the outer arc wall of the circular plate, the circular plate is rotatably connected to the rotating shaft, the annular weir plate 1 does not contact the inner cavity wall of the kettle body, an annular frame is fixed on the inner side wall of the annular weir plate 1, the annular frame is fixed to the inner cavity wall of the kettle body, and the annular frame is composed of a fixing ring and a plurality of L-shaped rods.

[0008] Preferably, the tower plate 2 is composed of an annular plate and an annular weir plate 2, the annular weir plate 2 is fixed on the inner arc wall of the annular plate, and the outer wall of the annular weir plate 2 is fixedly connected to the inner cavity wall of the kettle body.

[0009] Preferably, the gas circulation component 1 comprises a U-shaped tube 1, a main tube 1 and a U-shaped tube 2, a plurality of groups of U-shaped tubes 1 and U-shaped tubes 2 are arranged above the tower plate 1, the U-shaped tube 2 is located above the U-shaped tube 1, a plurality of groups of U-shaped tubes 1 are evenly fixed on the rotating shaft, and the U-shaped tube 1 is connected to the top of the cavity 2, the end of the U-shaped tube 1 away from the rotating shaft is connected to the main tube 1, both sides of the main tube 1 are connected to a plurality of groups of outlet tubes 1, a plurality of groups of U-shaped tubes 2 are evenly fixed on the rotating shaft, and the U-shaped tube 2 is connected to the bottom of the cavity 1, the lowest point of the U-shaped tube 2 is lower than the highest point of the annular weir plate 1, the end of the U-shaped tube 2 away from the rotating shaft is connected to the inlet pipe 1, the main tube 1 and the inlet pipe 1 are both higher than the highest point of the annular weir plate 1, and the outlet end of the outlet pipe 1 is lower than the highest point of the annular weir plate 1.

[0010] Preferably, the second gas circulation component comprises a second main pipe, a second outlet pipe and a second inlet pipe. A plurality of groups of second main pipes and a second inlet pipe are provided above the second tower plate. The second inlet pipe is located above the second main pipe. The plurality of groups of second main pipes are evenly fixed on the rotating shaft, and the second main pipe is connected to the top of the first cavity. The second main pipe is evenly connected to a plurality of groups of second outlet pipes. The plurality of groups of second inlet pipes are evenly fixed on the rotating shaft, and the second inlet pipe is connected to the bottom of the second cavity. The second main pipe and the second inlet pipe are both higher than the highest point of the second annular weir plate, and the outlet end of the second outlet pipe is lower than the highest point of the second annular weir plate.

[0011] Preferably, a rotating rod is provided at the bottom of the air outlet pipe one and the air outlet pipe two, a blowing piece is fixedly connected to the bottom of the rotating rod, the blowing piece is in the shape of a flying saucer, and air holes are evenly opened on the blowing piece, the rotating rod is a hollow rod, and the rotating rod is connected to the air outlet pipe and the blowing piece, and the bottom of the air inlet pipe one and the air inlet pipe two are connected to multiple groups of air collecting hoods, and the air collecting hoods are in the shape of an inverted funnel.

[0012] Preferably, the circular plate and the annular plate are both fixedly connected with multiple sets of gear rings, the rotating rod is sealed and rotatably connected with the air outlet pipe 1 and the air outlet pipe 2, and the bottom end of the blowing member is fixedly connected with a gear, which is meshingly connected with the gear ring.

[0013] Preferably, an annular tube is fixedly connected to the outer wall of the kettle body, the annular tube is connected to the feed pipe, and a plurality of groups of branch tubes are evenly connected on the inner wall of the annular tube close to the kettle body. A distribution ring 1 and a distribution ring 2 are provided in the inner cavity of the kettle body, the distribution ring 1 is funnel-shaped, the outer wall of the distribution ring 1 is fixedly connected to the inner wall of the kettle body through a connecting rod, the distribution ring 1 and the distribution ring 2 are located between one group of tower plates 1 and 2, the top of the distribution ring 2 is fixedly connected to the annular weir plate 2 above, and the inner diameter of the distribution ring 2 is the same as the inner diameter of the annular weir plate 2, the inner diameter of the neck of the distribution ring 1 is the same as the inner diameter of the distribution ring 2, and the branch tube extends from one end of the annular tube to between the distribution ring 1 and the distribution ring 2.

[0014] Preferably, a group of tower plates, an air inlet pipe and an air collecting hood are arranged at the bottom of the inner cavity of the kettle body, and a liquid level sensor is fixedly installed on the inner wall of the air collecting hood located at the bottom of the inner cavity of the kettle body.

[0015] A method for using a distillation kettle for producing o-methylphenylacetic acid, the method for using is applicable to the distillation kettle for producing o-methylphenylacetic acid described above, and the method for using comprises the following steps:

[0016] S1: Turn on heat exchanger 1, heat exchanger 2 and heat exchanger 3, the raw material enters the inner cavity of the kettle through the feed pipe from heat exchanger 1, the raw material is heated by the set heat exchanger 1, and the raw material enters the inner cavity of the kettle and descends layer by layer until the raw material flows to the bottom of the inner cavity of the kettle and begins to establish a liquid level;

[0017] S2: The liquid phase flow at the bottom of the inner cavity of the kettle is heated and vaporized by the reboiler. The heated gas-liquid mixture will automatically return to the kettle due to the density difference and establish a self-circulation;

[0018] S3: The vapor phase flow at the top of the kettle body will be condensed into liquid phase by the condenser, and the liquid phase will flow back to the top of the kettle body to establish cold reflux. At this time, the reflux liquid phase will fill the first and second plates of the distillation section, and the vapor-liquid phase heat and mass transfer process of the distillation section will be established. The vapor phase will be discharged from the top of the tower after condensation, and the liquid phase will be discharged from the bottom of the tower;

[0019] S4: During this process, the motor is controlled to drive the rotating shaft to rotate, so that the gas circulation components 1 and 2 on the tower plate 1 and the tower plate 2 rotate accordingly, realizing the steam rising channel while completing the full contact between the vapor phase and the liquid phase.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. The distillation kettle for producing o-methylphenylacetic acid and the method for using the distillation kettle according to the present invention drive the rotating shaft to rotate by a motor, so that the gas circulation component 1 and the gas circulation component 2 rotate slowly, which not only stirs the liquid layer on the tower plate 1 and the tower plate 2, thereby increasing the flow speed and mixing degree of the liquid phase, but also allows the steam to be evenly dispersed in the liquid layer, so that the vapor phase and the liquid phase can be fully contacted, further promoting the mass transfer and heat transfer between the gas and liquid phases.

[0022] 2. A distillation kettle for producing o-methylphenylacetic acid and a method for using the same according to the present invention can more effectively utilize the area of ​​the tower plates by staggering two circular tower plates with different diameters. In combination with the rotatable gas circulation assembly 1 and the gas circulation assembly 2, the separation efficiency of the entire distillation kettle can be further improved. The liquid phase descends in the form of an annular water curtain through the annular weir plate 1 and the annular weir plate 2, and a larger contact area can be formed between the annularly descending liquid and the ascending gas, which helps to increase the mass transfer and heat conversion between the vapor and liquid phases. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] Figure 1 It is a stereogram of the present invention as a whole;

[0025] Figure 2 yes Figure 1 A partial enlarged view of the middle part;

[0026] Figure 3 It is a partial cross-sectional view of the kettle body of the present invention;

[0027] Figure 4 yes Figure 3 The enlarged view of the part at B in the middle;

[0028] Figure 5 Schematic diagram of tray 1 and tray 2 of the present invention;

[0029] Figure 6 is a schematic diagram of a gas circulation component 1 of the present invention;

[0030] Figure 7 is a schematic diagram of the gas circulation component 2 of the present invention;

[0031] Figure 8 It is a partial schematic diagram of the blowing member of the present invention;

[0032] Fig. 9 It is a schematic diagram of one distribution ring of the present invention;

[0033] Fig.10 is a cross-sectional view of the gas collecting hood of the present invention;

[0034] In the figure: 1, kettle body; 101, feed pipe; 102, discharge pipe; 103, annular pipe; 104, branch pipe; 105, distribution ring 1; 106, connecting rod; 107, distribution ring 2; 2, skirt; 201, mounting plate; 202, motor; 203, rotating shaft; 204, cavity 1; 205, cavity 2; 3, tower plate 1; 301, circular plate; 302, annular weir plate 1; 303, U-shaped pipe 1; 304, main pipe 1; 305, discharge Gas pipe one; 306, U-shaped pipe two; 307, air inlet pipe one; 308, annular frame; 4, tower plate two; 401, annular plate; 402, annular weir plate two; 403, main pipe two; 404, air outlet pipe two; 405, air inlet pipe two; 5, heat exchanger one; 6, heat exchanger two; 7, reboiler; 8, condenser; 9, heat exchanger three; 10, blowing part; 11, rotating rod; 12, gear; 13, gear ring; 14, gas collecting hood; 15, liquid level sensor. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] like Figure 1-Figure 10As shown, a distillation kettle for producing o-methylphenylacetic acid according to an embodiment of the present invention comprises a kettle body 1, a heat exchanger 5 and a reboiler 7 are provided on one side of the kettle body 1, the heat exchanger 5 is located above the reboiler 7, and a condenser 8, a heat exchanger 3 9 and a heat exchanger 2 6 are provided on the other side of the kettle body 1 from top to bottom, a feed pipe 101 is provided on the side wall of the kettle body 1, the feed pipe 101 is connected to the heat exchanger 5, a discharge pipe 102 is provided at the bottom of the kettle body 1, the discharge pipe 102 is connected to both the heat exchanger 2 6 and the reboiler 7, the condenser 8 is connected to the top of the kettle body 1, the heat exchanger 3 9 is connected to the top of the side wall of the kettle body 1, and the inner wall of the kettle body 1 is provided with a discharge pipe 102. The discharge pipe 102 is connected to the heat exchanger 2 6 and the reboiler 7, the condenser 8 is connected to the top of the kettle body 1, the heat exchanger 3 9 is connected to the top of the side wall of the kettle body 1, and the inner wall of the kettle body 1 is provided with a discharge pipe 102. Multiple groups of trays 1 3 and trays 2 4 are alternately arranged in the cavity, a gas circulation component 1 is arranged on tray 1 3, a gas circulation component 2 is arranged on tray 2 4, a skirt 2 is fixedly connected to the bottom of the kettle body 1, a mounting plate 201 is fixedly connected to the inner wall of the skirt 2, a motor 202 is fixedly installed on the top of the mounting plate 201, a rotating shaft 203 is fixedly connected to the output end of the motor 202, the top end of the rotating shaft 203 extends into the inner cavity of the kettle body 1 and is connected to the gas circulation component 1 and the gas circulation component 2, the rotating shaft 203 is sealed and rotatably connected to the discharge pipe 102, and multiple groups of cavities 1 204 and cavities 2 205 are alternately arranged inside the rotating shaft 203;During operation, the raw material enters the inner cavity of the kettle body 1 from the heat exchanger 5 through the feed pipe 101, and the raw material is heated by the set heat exchanger 5. Since the feed pipe 101 is located in the middle of the kettle body 1, the raw material enters the inner cavity of the kettle body 1 and falls on the tower plate 3 in the middle, and then flows from the tower plate 3 to the tower plate 2 4 of the next layer, and so on, layer by layer, until the raw material flows to the bottom of the inner cavity of the kettle body 1 and begins to establish a liquid level. At this time, due to the liquid level difference, the inlet pipeline of the reboiler 7 will be full of liquid phase, and the liquid phase flow at the bottom of the inner cavity of the kettle body 1 will be heated and vaporized by the reboiler 7. The heated gas-liquid mixture will automatically return to the kettle due to the density difference. In the kettle 1, and establish a self-circulation, so that the vapor phase will fill the kettle 1, first establish the vapor-liquid heat and mass transfer process of the stripping section, the vapor phase flow at the top of the kettle 1 will be condensed into a liquid phase by the condenser 8, and the liquid phase will reflux to the top of the kettle 1 to establish a cold reflux. At this time, the reflux liquid phase will fill the tower plate 1 3 and the tower plate 2 4 of the distillation section, and the vapor-liquid heat and mass transfer process of the distillation section will be established. When the bottom reboiling of the kettle 1 is established, the temperature distribution in the kettle 1 will change accordingly, and the temperature will gradually decrease from bottom to top. The vapor phase is discharged from the top of the tower after condensation, and the liquid phase is discharged from the bottom of the tower. At this time, the temperature distribution of the kettle 1 will be completely established. In this process, the temperature on the tower plate 1 3 The gas circulation component 1 cooperates with the gas circulation component 2 on the tower plate 2 4, so that the steam at the bottom of the tower can be dispersed into the liquid layer on the tower plate 1 3 and the tower plate 2 4 during the upward flow, contact with the liquid, and form a bubbling layer on the plate, providing a large number of interfaces for heat transfer and mass transfer between the vapor and liquid phases. At the same time, the motor 202 on the mounting plate 201 drives the rotating shaft 203 to rotate, so that the gas circulation component 1 and the gas circulation component 2 rotate slowly, which not only stirs the liquid layer on the tower plate 1 3 and the tower plate 2 4, increasing the flow speed and mixing degree of the liquid phase, but also allows the steam to be evenly dispersed in the liquid layer, and the vapor phase and the liquid phase can be fully The partial contact further promotes the mass transfer and heat transfer between the gas and liquid phases, and solves the problem that in the prior art, the vapor phase ascending channel in the distillation equipment usually adopts a bubble cap or a float valve structure. The bubble cap structure is composed of a riser pipe and a bubble cap, and the float valve structure replaces the riser pipe and the bubble cap with a float valve, both of which are fixed on the tower plate. These structures are fixed on the tower plate as a single unit, and the contact between the steam and the liquid layer on the tower plate is promoted by increasing the number of distributions to achieve the mass transfer and heat transfer process between the gas and liquid phases. However, due to the fixed monomers in this structure, each monomer can only radiate a limited area around it, resulting in uneven mixing of the gas and liquid, and prone to the problem of areas with low mass transfer and heat transfer efficiency. ;

[0037] The tower plate 3 is composed of a circular plate 301, an annular weir plate 302 and an annular frame 308. The annular weir plate 302 is fixed on the outer arc wall of the circular plate 301. The circular plate 301 is sealed and rotatably connected to the rotating shaft 203. The annular weir plate 302 does not contact the inner cavity wall of the kettle body 1. An annular frame 308 is fixed on the inner wall of the annular weir plate 302. The annular frame 308 is fixed to the inner cavity wall of the kettle body 1. The annular frame 308 is composed of a fixed ring and a plurality of L-shaped rods. During operation, when the liquid phase flows on the tower plate 3, the liquid phase will accumulate on the circular plate 301 until the liquid level exceeds the highest point of the annular weir plate 302. The liquid phase will flow downward along the top of the annular weir plate 302 and form an annular water curtain. A larger contact area can be formed between the annularly descending liquid and the rising gas, which is helpful to increase the mass transfer and heat transfer between the vapor and liquid phases.

[0038] The tower plate 2 4 is composed of an annular plate 401 and an annular weir plate 2 402. The annular weir plate 2 402 is fixed on the inner arc wall of the annular plate 401, and the outer wall of the annular weir plate 2 402 is fixedly connected to the inner cavity wall of the kettle body 1. During operation, when the liquid phase drops from the tower plate 1 3 to the tower plate 2 4, the liquid phase will accumulate on the annular plate 401 until the height of the liquid level exceeds the highest point of the annular weir plate 2 402. The liquid phase will flow downward along the top of the annular weir plate 2 402 and form an annular water curtain. By staggeredly arranging two circular tower plates with different diameters, the area of ​​the tower plates can be more effectively utilized. Combined with the rotatable gas circulation component 1 and gas circulation component 2, the separation efficiency of the entire distillation kettle can be further improved.

[0039] The gas circulation component 1 includes a U-shaped tube 1 303, a main tube 1 304 and a U-shaped tube 2 306. A plurality of groups of U-shaped tubes 1 303 and U-shaped tubes 2 306 are arranged above the tower plate 1 3. The U-shaped tube 2 306 is located above the U-shaped tube 1 303. The plurality of groups of U-shaped tubes 1 303 are evenly fixed on the rotating shaft 203, and the U-shaped tube 1 303 is connected to the top of the cavity 2 205. The end of the U-shaped tube 1 303 away from the rotating shaft 203 is connected to the main tube 1 304. Both sides of the main tube 1 304 are connected to a plurality of groups of gas outlet pipes 1 305. The second U-shaped tube 306 is evenly fixed on the rotating shaft 203, and the second U-shaped tube 306 is connected to the bottom of the cavity 204. The lowest point of the second U-shaped tube 306 is lower than the highest point of the annular weir plate 302. The end of the second U-shaped tube 306 away from the rotating shaft 203 is connected with the inlet pipe 307. The main pipe 304 and the inlet pipe 307 are both higher than the highest point of the annular weir plate 302. The outlet end of the outlet pipe 305 is lower than the highest point of the annular weir plate 302. When working, the gas is discharged from the gas circulation assembly on the lower tray 24. After entering the cavity 205 of the rotating shaft 203 from the second cavity 205, it flows along the top of the cavity 205 to the U-shaped tube 1 303, and enters each gas outlet pipe 1 305 from the U-shaped tube 1 303 through the main pipe 1 304, and finally, it is ejected from the gas outlet pipe 1 305 to achieve full contact with the liquid phase on the tower plate 1 3. After part of the gas is separated from the liquid phase, it enters the gas inlet pipe 1 307 from the top of the tower plate 1 3, and enters the cavity 1 204 of the rotating shaft 203 along the U-shaped tube 2 306, and flows to the tower plate 2 4 of the upper layer, and so on. An overall ascending passage for steam is formed. The U-shaped tube 1 303 and the U-shaped tube 2 306 are designed so that the U-shaped tube 1 303 and the U-shaped tube 2 306 will not interfere with the liquid phase annular water curtain descending from the annular weir plate 2 402 of the upper layer during the slow rotation of the rotating shaft 203. The main pipe 1 304, the air outlet pipe 1 305 and the air inlet pipe 1 307 are designed so that the liquid phase will not submerge the main pipe 1 304 and the air inlet pipe 1 307, and the steam will directly contact the liquid phase when it is ejected from the air outlet pipe 1 305.

[0040] The gas circulation component 2 includes a main pipe 2 403, an outlet pipe 2 404 and an inlet pipe 2 405. A plurality of main pipes 2 403 and inlet pipes 2 405 are arranged above the tower plate 2 4. The inlet pipe 2 405 is located above the main pipe 2 403. The plurality of main pipes 2 403 are evenly fixed on the rotating shaft 203, and the main pipe 2 403 is connected to the top of the cavity 1 204. The main pipe 2 403 is evenly connected to the plurality of outlet pipes 2 404, and the plurality of inlet pipes 2 405 are evenly fixed on the rotating shaft 203, and the inlet pipe 2 405 is connected to the bottom of the cavity 205. The main pipe 2 403 and the inlet pipe 2 405 are both higher than the uppermost portion of the annular weir plate 2 402. The gas outlet end of the second gas outlet pipe 404 is lower than the highest point of the annular weir plate 402; when working, the gas enters the cavity 204 of the rotating shaft 203 from the gas inlet pipe 1 307 on the lower tower plate 1 3, flows along the top of the cavity 204 to the main pipe 2 403, and enters each gas outlet pipe 2 404 through the main pipe 2 403, and finally, is ejected from the gas outlet pipe 2 404 to achieve full contact with the liquid phase on the tower plate 2 4, and part of the gas leaves the liquid phase and enters the gas inlet pipe 2 405 from the top of the tower plate 2 4, and enters the cavity 205 of the rotating shaft 203 along the gas inlet pipe 2 405, and flows to the upper tower plate 3, and so on.

[0041] The bottom of the air outlet pipe 305 and the air outlet pipe 2 404 are both provided with a rotating rod 11, and a blowing piece 10 is fixedly connected to the bottom of the rotating rod 11. The blowing piece 10 is in the shape of a flying saucer, and air holes are evenly opened on the blowing piece 10. The rotating rod 11 is a hollow rod, and the rotating rod 11 is connected to the air outlet pipe and the blowing piece 10. The bottom of the air inlet pipe 307 and the air inlet pipe 2 405 are both connected to multiple groups of air collecting hoods 14, and the air collecting hood 14 is in the shape of an inverted funnel. When working, the air inlet pipe 307 and the air inlet pipe 2 405 are connected to the bottom of the air inlet pipe 307 and the air inlet pipe 2 405. A flying saucer-shaped blowing piece 10 is provided below the air pipe 1 305 and the air outlet pipe 2 404, and air holes are opened on the blowing piece 10, so that the steam can be evenly sprayed to all sides along the air holes on the blowing piece 10, and more effectively achieve full contact with the liquid phase. By providing a gas collecting hood 14 at the bottom of the air inlet pipe 1 307 and the air inlet pipe 2 405, the gas separated from the liquid phase can smoothly enter the air inlet pipe 1 307 and the air inlet pipe 2 405 from the gas collecting hood 14.

[0042] Multiple sets of toothed rings 13 are fixedly connected to the circular plate 301 and the annular plate 401, and the rotating rod 11 is sealed and rotatably connected to the air outlet pipe 1 305 and the air outlet pipe 2 404. The bottom end of the blowing piece 10 is fixedly connected to a gear 12, and the gear 12 is meshed and connected with the toothed ring 13. During operation, multiple sets of toothed rings 13 corresponding to the blowing piece 10 are arranged on the circular plate 301 and the annular plate 401, so that when the air outlet pipe 1 305 and the air outlet pipe 2 404 rotate with the rotating shaft 203, the gear 12 at the bottom of the blowing piece 10 is continuously meshed with the toothed ring 13, driving the blowing piece 10 to rotate, thereby making the blowing piece 10 rotate while revolving around the rotating shaft 203, thereby further improving the mass transfer and heat transfer of the vapor-liquid two phases.

[0043] An annular tube 103 is fixedly connected to the outer wall of the kettle body 1, and the annular tube 103 is connected to the feed tube 101. The inner wall of the annular tube 103 close to the kettle body 1 is evenly connected with multiple groups of branch tubes 104. A distribution ring 105 and a distribution ring 2 107 are arranged in the inner cavity of the kettle body 1. The distribution ring 105 is funnel-shaped. The outer wall of the distribution ring 105 is fixedly connected to the inner wall of the kettle body 1 through a connecting rod 106. The distribution ring 105 and the distribution ring 2 107 are located between one group of tower plates 1 3 and tower plates 2 4. The top of the distribution ring 2 107 is fixedly connected to the annular weir plate 2 402 above, and the inner diameter of the distribution ring 2 107 is the same as the inner diameter of the annular weir plate 2 402. The inner diameter of the neck of the distribution ring 105 is the same as the inner diameter of the distribution ring 2 107. The branch tube 104 extends from one end of the annular tube 103 to the distribution ring 105 and the distribution ring 107. During operation, the feed pipe 101 cooperates with the annular pipe 103 and the multiple groups of branch pipes 104 to allow the raw materials to enter the inner cavity of the kettle body 1 and flow directly to the top of the distribution ring 105, and flow downward along the distribution ring 105 to form an annular water curtain. Through the design of the distribution ring 105 and the distribution ring 2 107, the liquid phase descending from the top of the tower falls along the annular weir plate 2 402 to the distribution ring 2 107, and flows along the distribution ring 2 107 to form an annular water curtain and descends to the tower plate 1 3 below. The raw materials that have just entered the kettle body 1 and flow along the distribution ring 105 will not only not interfere with the annular water curtain formed on the distribution ring 2 107, but also can combine with the liquid liquid flowing on the distribution ring 2 107 to form a new annular water curtain, thereby realizing the liquid seal between the tower plate 1 3 and the tower plate 2 4 at the feed pipe 101.

[0044] A group of tower plates 3, an air inlet pipe 307 and an air collecting hood 14 are arranged at the bottom of the inner cavity of the kettle body 1, and a liquid level sensor 15 is fixedly installed on the inner wall of the air collecting hood 14 located at the bottom of the inner cavity of the kettle body 1; when working, by installing the liquid level sensor 15 on the inner wall of the air collecting hood 14 at the bottom of the inner cavity of the kettle body 1, when liquid overflow occurs in the kettle body 1, feedback can be given quickly, which is convenient for the staff to judge and operate according to the situation.

[0045] A method for using a distillation kettle for producing o-methylphenylacetic acid, the method for using is applicable to the above-mentioned distillation kettle for producing o-methylphenylacetic acid, and the method for using comprises the following steps:

[0046] S1: Turn on the heat exchanger 1 5, the heat exchanger 2 6 and the heat exchanger 3 9, the raw material enters the inner cavity of the kettle body 1 from the heat exchanger 1 5 through the feed pipe 101, the raw material is heated by the set heat exchanger 1 5, and the raw material enters the inner cavity of the kettle body 1 and descends layer by layer until the raw material flows to the bottom of the inner cavity of the kettle body 1 and starts to establish a liquid level;

[0047] S2: The liquid phase flow at the bottom of the inner cavity of the kettle body 1 is heated and vaporized by the reboiler 7. The heated gas-liquid mixture will automatically return to the kettle body 1 due to the density difference, and a self-circulation is established;

[0048] S3: The vapor phase flow at the top of the kettle body 1 will be condensed into a liquid phase by the condenser 8, and the liquid phase will reflux to the top of the kettle body 1 to establish a cold reflux. At this time, the reflux liquid phase will fill the tray 1 3 and tray 2 4 of the distillation section, and the vapor-liquid phase heat and mass transfer process of the distillation section will be established. The vapor phase is discharged from the top of the tower after condensation, and the liquid phase is discharged from the bottom of the tower;

[0049] S4: During this process, the control motor 202 drives the rotating shaft 203 to rotate, so that the gas circulation components 1 and 2 on the tower plate 1 3 and the tower plate 2 4 rotate accordingly, realizing the steam rising channel and completing the full contact between the vapor phase and the liquid phase.

[0050] Working principle: the raw material enters the inner cavity of the kettle body 1 from the heat exchanger 5 through the feed pipe 101, and the raw material is heated by the set heat exchanger 5. Since the feed pipe 101 is located in the middle of the kettle body 1, the raw material enters the inner cavity of the kettle body 1 and falls on the tower plate 3 in the middle, and then flows from the tower plate 3 to the tower plate 24 of the next layer, and so on and so forth, descending layer by layer, until the raw material flows to the bottom of the inner cavity of the kettle body 1 and begins to establish a liquid level. At this time, due to the liquid level difference, the inlet pipeline of the reboiler 7 will be full of liquid phase, and the liquid phase flow at the bottom of the inner cavity of the kettle body 1 will be heated and vaporized by the reboiler 7. The heated gas-liquid mixture will automatically return to the kettle body 1 due to the density difference, and establish a self-circulation. In this way, the vapor phase will fill the kettle body 1, and the vapor-liquid heat transfer of the stripping section will be established first. In the mass transfer process, the vapor phase flow at the top of the kettle body 1 will be condensed into a liquid phase by the condenser 8, and the liquid phase will reflux to the top of the kettle body 1 to establish cold reflux. At this time, the reflux liquid phase will fill the tower plate 1 3 and the tower plate 2 4 of the distillation section to establish the vapor-liquid phase heat and mass transfer process of the distillation section. When the reboiling at the bottom of the kettle body 1 is established, the temperature distribution in the kettle body 1 changes accordingly, and the temperature gradually decreases from bottom to top. The vapor phase is discharged from the top of the tower after condensation, and the liquid phase is discharged from the bottom of the tower. At this time, the temperature distribution of the kettle body 1 will be completely established. In this process, the gas circulation component 1 on the tower plate 1 3 cooperates with the gas circulation component 2 on the tower plate 2 4, so that the steam at the bottom of the tower can be dispersed into the liquid layer on the tower plate 1 3 and the tower plate 2 4 during the upward flow, contact with the liquid, and form a bubbling layer on the plate to provide steam. A large number of interfaces are provided for heat and mass transfer between the liquid phases. At the same time, the motor 202 on the mounting plate 201 drives the rotating shaft 203 to rotate, so that the gas circulation component 1 and the gas circulation component 2 rotate slowly, which not only stirs the liquid layer on the tower plate 1 3 and the tower plate 2 4, increasing the flow speed and mixing degree of the liquid phase, but also allows the steam to be evenly dispersed in the liquid layer, and the vapor phase and the liquid phase can be fully contacted, further promoting the mass transfer and heat transfer between the gas and liquid phases. When the liquid phase flows on the tower plate 1 3, the liquid phase will accumulate on the circular plate 301 until the liquid level exceeds the highest point of the annular weir plate 1 302. The liquid phase will flow downward along the top of the annular weir plate 1 302 and form an annular water curtain. The annular descending liquid and the rising gas A larger contact area can be formed between them, which is helpful to increase the mass transfer and heat transfer between the vapor and liquid phases. When the liquid phase falls from the tower plate 1 3 to the tower plate 2 4, the liquid phase will accumulate on the annular plate 401 until the height of the liquid level exceeds the highest point of the annular weir plate 2 402. The liquid phase will flow downward along the top of the annular weir plate 2 402 and form an annular water curtain. By staggering two circular tower plates with different diameters, the area of ​​the tower plates can be more effectively utilized. In combination with the rotatable gas circulation component 1 and gas circulation component 2, the separation efficiency of the entire distillation kettle can be further improved. After the gas enters the cavity 205 of the rotating shaft 203 from the air inlet pipe 2 405 on the lower tower plate 2 4, it flows along the top of the cavity 205 to the U-shaped tube 1 303.And enter each outlet pipe 1 305 through the main pipe 1 304 from the U-shaped tube 1 303, and finally, it is ejected from the outlet pipe 1 305 to achieve full contact with the liquid phase on the tower plate 1 3. After part of the gas is separated from the liquid phase, it enters the inlet pipe 1 307 from the top of the tower plate 1 3, and enters the cavity 1 204 of the rotating shaft 203 along the U-shaped tube 2 306, and flows to the tower plate 2 4 of the upper layer, and so on, forming an overall rising channel for steam. By designing the U-shaped tube 1 303 and the U-shaped tube 2 306, the U-shaped tube 1 303 and the U-shaped tube 2 306 will not interfere with the liquid phase annular water curtain descending from the annular weir plate 2 402 of the upper layer during the slow rotation of the rotating shaft 203. By designing the main pipe 1 304, the U-shaped tube 1 303 and the U-shaped tube 2 306 The design of the outlet pipe 1 305 and the inlet pipe 1 307 ensures that the liquid phase will not submerge the main pipe 1 304 and the inlet pipe 1 307, and the steam directly contacts the liquid phase when it is ejected from the outlet pipe 1 305. After the gas enters the cavity 1 204 of the rotating shaft 203 from the inlet pipe 1 307 on the lower tower plate 1 3, it flows along the top of the cavity 1 204 to the main pipe 2 403, and enters each outlet pipe 2 404 through the main pipe 2 403, and finally, it is ejected from the outlet pipe 2 404 to achieve full contact with the liquid phase on the tower plate 2 4. After part of the gas leaves the liquid phase, it enters the inlet pipe 2 405 from above the tower plate 2 4, and enters the cavity 205 of the rotating shaft 203 along the inlet pipe 2 405, and flows to the tower plate 1 3 of the upper layer. , and so on. By arranging multiple groups of toothed rings 13 corresponding to the blowing member 10 on the circular plate 301 and the annular plate 401, the gears 12 at the bottom of the blowing member 10 are constantly meshed with the toothed rings 13 during the rotation of the rotating shaft 203, driving the blowing member 10 to rotate, thereby causing the blowing member 10 to rotate while revolving around the rotating shaft 203, further improving the mass transfer and heat transfer of the vapor-liquid two phases. The feed pipe 101 cooperates with the annular pipe 103 and the multiple groups of branch pipes 104, so that the raw materials enter the inner cavity of the kettle body 1 and flow directly to the top of the distribution ring 105, and flow downward along the distribution ring 105 to form an annular water curtain, and the distribution ring 105 and the distribution ring 2 107 are connected. The design allows the liquid phase descending from the top of the tower to fall along the annular weir plate 402 to the distribution ring 107, and flows along the distribution ring 107 to form an annular water curtain and descend to the tower plate 103 below. The raw materials that have just entered the kettle body 1 and flow along the distribution ring 105 will not only not interfere with the annular water curtain formed on the distribution ring 107, but can also combine with the liquid flowing on the distribution ring 107 to form a new annular water curtain, thereby achieving a liquid seal between the tower plate 103 and the tower plate 204 at the feed pipe 101. By installing a liquid level sensor 15 on the inner wall of the gas collecting hood 14 at the bottom of the inner cavity of the kettle body 1, when liquid overflow occurs in the kettle body 1, feedback can be quickly given, which is convenient for the staff to judge and operate according to the situation.

[0051] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0052] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0053] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A distillation kettle for producing o-methylphenylacetic acid, comprising a kettle body (1), wherein one side of the kettle body (1) is provided with a heat exchanger 1 (5) and a reboiler (7), wherein the heat exchanger 1 (5) is located above the reboiler (7), and the other side of the kettle body (1) is provided with a condenser (8), a heat exchanger 3 (9) and a heat exchanger 2 (6) in order from top to bottom, a feed pipe (101) is provided on the side wall of the kettle body (1), wherein the feed pipe (101) is connected to the heat exchanger 1 (5), a discharge pipe (102) is provided at the bottom of the kettle body (1), wherein the discharge pipe (102) is connected to both the heat exchanger 2 (6) and the reboiler (7), the condenser (8) is connected to the top of the kettle body (1), and the heat exchanger 3 (9) is connected to the top of the side wall of the kettle body (1), characterized in that: A plurality of groups of tower plates 1 (3) and tower plates 2 (4) are arranged alternately in the inner cavity of the kettle body (1); a gas circulation component 1 is arranged on the tower plate 1 (3); a gas circulation component 2 is arranged on the tower plate 2 (4); a skirt seat (2) is fixedly connected to the bottom of the kettle body (1); a mounting plate (201) is fixedly connected to the inner wall of the skirt seat (2); a motor (202) is fixedly mounted on the top of the mounting plate (201); a rotating shaft (203) is fixedly connected to the output end of the motor (202); a top end of the rotating shaft (203) extends into the inner cavity of the kettle body (1) and is connected to the gas circulation component 1 and the gas circulation component 2; the rotating shaft (203) is sealed and rotatably connected to the discharge pipe (102); and a plurality of groups of cavities 1 (204) and cavities 2 (205) are arranged alternately in the interior of the rotating shaft (203).

2. A rectifying kettle for producing o-methylphenylacetic acid according to claim 1, characterized in that: The tower plate 1 (3) is composed of a circular plate (301), an annular weir plate 1 (302) and an annular frame (308); the annular weir plate 1 (302) is fixed on the outer arc wall of the circular plate (301); the circular plate (301) is connected to the rotating shaft (203) in a sealed rotation manner; the annular weir plate 1 (302) does not contact the inner cavity wall of the kettle body (1); an annular frame (308) is fixedly connected to the inner side wall of the annular weir plate 1 (302); the annular frame (308) is fixedly connected to the inner cavity wall of the kettle body (1); and the annular frame (308) is composed of a fixing ring and a plurality of L-shaped rods.

3. A rectifying kettle for producing o-methylphenylacetic acid according to claim 2, characterized in that: The tower plate 2 (4) is composed of an annular plate (401) and an annular weir plate 2 (402). The annular weir plate 2 (402) is fixed on the inner arc wall of the annular plate (401), and the outer wall of the annular weir plate 2 (402) is fixedly connected to the inner cavity wall of the kettle body (1).

4. A rectifying kettle for producing o-methylphenylacetic acid according to claim 3, characterized in that: The gas circulation component 1 comprises a U-shaped tube 1 (303), a main tube 1 (304) and a U-shaped tube 2 (306). A plurality of groups of U-shaped tubes 1 (303) and U-shaped tubes 2 (306) are arranged above the tower plate 1 (3). The U-shaped tube 2 (306) is located above the U-shaped tube 1 (303). The plurality of groups of U-shaped tubes 1 (303) are evenly fixed on the rotating shaft (203). The U-shaped tube 1 (303) is connected to the top of the cavity 2 (205). The end of the U-shaped tube 1 (303) away from the rotating shaft (203) is connected to the main tube 1 (304). Both sides of the main tube 1 (304) are connected to the main tube 1 (304). There are multiple groups of outlet pipes 1 (305), multiple groups of U-shaped pipes 2 (306) are evenly fixed on the rotating shaft (203), and the U-shaped pipes 2 (306) are connected to the bottom of the cavity 1 (204), the lowest point of the U-shaped pipes 2 (306) is lower than the highest point of the annular weir plate 1 (302), and one end of the U-shaped pipes 2 (306) away from the rotating shaft (203) is connected to an inlet pipe 1 (307), the main pipe 1 (304) and the inlet pipe 1 (307) are both higher than the highest point of the annular weir plate 1 (302), and the outlet end of the outlet pipe 1 (305) is lower than the highest point of the annular weir plate 1 (302).

5. A rectifying kettle for producing o-methylphenylacetic acid according to claim 4, characterized in that: The gas circulation component 2 comprises a main pipe 2 (403), an outlet pipe 2 (404) and an inlet pipe 2 (405). A plurality of main pipes 2 (403) and inlet pipes 2 (405) are arranged above the tower plate 2 (4). The inlet pipes 2 (405) are located above the main pipes 2 (403). The plurality of main pipes 2 (403) are evenly fixed to the rotating shaft (203). The main pipes 2 (403) are connected to the top of the cavity 1 (204). The main pipe 2 (403) is evenly connected to multiple groups of outlet pipes 2 (404), and multiple groups of inlet pipes 2 (405) are evenly fixed on the rotating shaft (203), and the inlet pipe 2 (405) is connected to the bottom of the cavity 2 (205). The main pipe 2 (403) and the inlet pipe 2 (405) are both higher than the highest point of the annular weir plate 2 (402), and the outlet end of the outlet pipe 2 (404) is lower than the highest point of the annular weir plate 2 (402).

6. A rectifying kettle for producing o-methylphenylacetic acid according to claim 5, characterized in that: The bottom of the air outlet pipe 1 (305) and the air outlet pipe 2 (404) are both provided with a rotating rod (11), the bottom of the rotating rod (11) is fixedly connected with a blowing piece (10), the blowing piece (10) is in the shape of a flying saucer, and air holes are evenly opened on the blowing piece (10), the rotating rod (11) is a hollow rod, and the rotating rod (11) is connected to the air outlet pipe and the blowing piece (10), and the bottom of the air inlet pipe 1 (307) and the air inlet pipe 2 (405) are both connected to multiple groups of air collecting hoods (14), and the air collecting hoods (14) are in the shape of an inverted funnel.

7. A rectifying kettle for producing o-methylphenylacetic acid according to claim 6, characterized in that: The circular plate (301) and the annular plate (401) are both fixedly connected with a plurality of sets of toothed rings (13); the rotating rod (11) is sealed and rotatably connected with the first air outlet pipe (305) and the second air outlet pipe (404); the bottom end of the blowing member (10) is fixedly connected with a gear (12); and the gear (12) is meshingly connected with the toothed ring (13).

8. A rectifying kettle for producing o-methylphenylacetic acid according to claim 7, characterized in that: An annular tube (103) is fixedly connected to the outer wall of the kettle body (1), the annular tube (103) is connected to the feed tube (101), and a plurality of branches (104) are evenly connected to the inner wall of the annular tube (103) on one side close to the kettle body (1). A distribution ring 1 (105) and a distribution ring 2 (107) are provided in the inner cavity of the kettle body (1), the distribution ring 1 (105) is funnel-shaped, and the outer wall of the distribution ring 1 (105) is fixedly connected to the inner wall of the kettle body (1) via a connecting rod (106). The first distribution ring (105) and the second distribution ring (107) are located between one group of tower plates (3) and (4), the top of the second distribution ring (107) is fixedly connected to the second annular weir plate (402) above, and the inner diameter of the second distribution ring (107) is the same as the inner diameter of the second annular weir plate (402), the inner diameter of the neck of the first distribution ring (105) is the same as the inner diameter of the second distribution ring (107), and the branch pipe (104) extends from one end away from the annular pipe (103) to between the first distribution ring (105) and the second distribution ring (107).

9. A rectifying kettle for producing o-methylphenylacetic acid according to claim 8, characterized in that: A group of tower plates (3), an air inlet pipe (307) and an air collecting hood (14) are arranged at the bottom of the inner cavity of the kettle body (1), and a liquid level sensor (15) is fixedly installed on the inner wall of the air collecting hood (14) located at the bottom of the inner cavity of the kettle body (1).

10. A method for using a distillation kettle for producing o-methylphenylacetic acid, characterized in that: The method of use is applicable to a distillation kettle for producing o-methylphenylacetic acid as described in any one of claims 1 to 9, and the method of use comprises the following steps: S1: Open the heat exchanger 1 (5), the heat exchanger 2 (6) and the heat exchanger 3 (9), and the raw material enters the inner cavity of the kettle body (1) from the heat exchanger 1 (5) through the feed pipe (101), and the raw material is heated by the heat exchanger 1 (5). The raw material enters the inner cavity of the kettle body (1) and descends layer by layer until the raw material flows to the bottom of the inner cavity of the kettle body (1) and begins to establish a liquid level; S2: The liquid phase flow at the bottom of the inner cavity of the kettle (1) is heated and vaporized by the reboiler (7). The heated gas-liquid mixture will automatically return to the kettle (1) due to the density difference, and a self-circulation is established; S3: The vapor phase flow at the top of the kettle body (1) will be condensed into a liquid phase by the condenser (8), and the liquid phase will reflux to the top of the kettle body (1) to establish a cold reflux. At this time, the reflux liquid phase will fill the tower plate 1 (3) and the tower plate 2 (4) of the distillation section, and the vapor-liquid phase heat and mass transfer process of the distillation section will be established. The vapor phase will be discharged from the top of the tower after condensation, and the liquid phase will be discharged from the bottom of the tower; S4: During this process, the control motor (202) drives the rotating shaft (203) to rotate, so that the gas circulation components 1 and 2 on the tower plate 1 (3) and the tower plate 2 (4) rotate accordingly, thereby realizing the steam rising channel and achieving full contact between the vapor phase and the liquid phase.

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