A acylation kettle for producing 4-trifluoromethylnicotinic acid

Abstract

The invention belongs to the technical field of acylation kettles, and specifically is an acylation kettle for producing 4-trifluoromethylnicotinic acid, comprising a kettle body; a motor is fixedly connected at the center of the top end of the kettle body, and a first rotating shaft is arranged at the output end of the motor; the first rotating shaft extends into the kettle body and is rotatably connected at the center of the bottom end of the kettle body, and a first cavity is arranged in the first rotating shaft; a group of connecting pipes are fixedly connected to the outer side wall of the first rotating shaft close to the bottom end; a fixing block is fixedly connected to the end of the connecting pipe; a second rotating shaft is rotatably connected to the middle of the fixing block; a second cavity is arranged in the second rotating shaft; a spiral blade is arranged on the outer side wall of the second rotating shaft; a group of communicating cavities are arranged in the spiral blade, and the communicating cavity and the second cavity are communicated with each other; the waste of trifluoroacetyl chloride gas and the low reaction efficiency and unbalanced reaction of the acylation kettle are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of acylation kettles, in particular to an acylation kettle for producing 4-trifluoromethylnicotinic acid. Background Art

[0002] 4-Trifluoromethylnicotinic acid is a new type of fluorine-containing chemical. Its downstream products (development code IKI-220, generic name flonicamid, trade names Aria, Carbine, Turbine, etc.) were discovered by Japan's ISK Company and jointly developed with the US FMC Company. The current global consumption of this product is 1,000 tons, and the global market demand is estimated to be more than 1,500 tons in 2018, with a selling price of about 450,000 yuan per ton. The acylation process of 4-trifluoromethylnicotinic acid in the production process is: dichloromethane, ethyl vinyl ether (EVE), and pyridine are directly pumped from the storage tank into the acylation kettle through a metering pump, stirring is started, and trifluoroacetyl chloride (TFC) is directly introduced from the trifluoroacetyl chloride cylinder into the acylation kettle at 25°C.

[0003] In the prior art, when trifluoroacetyl chloride is directly introduced from a trifluoroacetyl chloride cylinder into an acylation kettle, gas is generally introduced from the bottom to ensure that the gas can be uniformly dissolved in the acylation kettle for chemical reaction. However, since gas is charged from the bottom, the reaction efficiency of the liquid below the acylation kettle is higher than that of the liquid above the acylation kettle, resulting in an unbalanced overall reaction situation, affecting the overall reaction efficiency and quality. At the same time, since the trifluoroacetyl chloride gas in the acylation kettle is charged from the bottom, part of the gas will form bubbles in the liquid, explode at the liquid surface, and be mixed with the reaction waste gas and discharged, wasting raw materials. At the same time, since the raw materials are generally put in according to a proportion, if too many bubbles explode at the liquid surface, which will lead to a large waste of trifluoroacetyl chloride gas, the overall reaction in the acylation kettle will not be thorough, affecting the subsequent production quality.

[0004] To this end, the present invention provides an acylation kettle for producing 4-trifluoromethylnicotinic acid. Summary of the invention

[0005] In order to make up for the shortcomings of the prior art and solve the problems of waste of trifluoroacetyl chloride gas and low reaction efficiency and unbalanced reaction of the acylation kettle, the present invention provides an acylation kettle for producing 4-trifluoromethylnicotinic acid.

[0006] The technical solution adopted by the present invention to solve the technical problem is as follows: the acylation kettle for producing 4-trifluoromethylnicotinic acid described in the present invention comprises a kettle body; a motor is fixedly connected at the center of the top end of the kettle body, and a first rotating shaft is provided at the output end of the motor; the first rotating shaft extends into the kettle body and is rotatably connected to the center of the bottom end of the kettle body, and a first cavity is provided in the first rotating shaft; a group of connecting pipes are fixedly connected to the outer wall of the first rotating shaft near the bottom end; a fixing block is fixedly connected to the end of the connecting pipe; a second rotating shaft is rotatably connected to the middle of the fixing block; a second cavity is provided in the second rotating shaft; a spiral blade is provided on the outer wall of the second rotating shaft; a group of connecting cavities are provided in the spiral blade, and the connecting cavity and the second cavity are connected to each other. ; A group of air outlet holes are provided on the spiral surface of the spiral blade; the second cavity is inflated by the air inlet unit, and the gas is ejected through the air outlet holes; the second rotating shaft is rotated by the power unit, so that the spiral blade drives the water to flow downward; a group of layered valves are provided on the outer wall of the kettle body; a feed valve and an air outlet valve are provided on the top of the kettle body; in the prior art, when trifluoroacetyl chloride is directly introduced into the acylation kettle from the trifluoroacetyl chloride cylinder, air is generally introduced from the bottom to ensure that the gas can be uniformly dissolved in the acylation kettle for chemical reaction, but because the air is inflated from the bottom, the reaction efficiency of the liquid below the acylation kettle is higher than that of the liquid above the acylation kettle, resulting in an unbalanced overall reaction situation, affecting the overall reaction efficiency and quality, and at the same time, due to the acylation The trifluoroacetyl chloride gas in the kettle is filled from the bottom, which will cause part of the gas to form bubbles in the liquid, explode at the liquid surface, and mix with the reaction waste gas and be discharged, wasting raw materials. At the same time, because the raw materials are generally put in according to proportion, if too many bubbles explode on the liquid surface, it will cause a lot of trifluoroacetyl chloride gas waste, which will cause the overall reaction in the acylation kettle to be incomplete and affect the subsequent production quality. For this reason, when the present invention is working, a spiral blade is provided. After the trifluoroacetyl chloride gas is filled into the second cavity through the air intake unit, the gas will enter the connecting cavity and be ejected through the air outlet. At this time, the motor will drive the first rotating shaft to rotate, and the first rotating shaft will drive the fixed block to rotate through the connecting pipe, and then drive the second rotating shaft to rotate around the first rotating shaft, first forming a stirring for the liquid At the same time, the power unit will drive the second rotating shaft to rotate, and then drive the spiral blades to rotate. When the spiral blades rotate, the water flow on the threaded blades will be in a downward flow state. At this time, the gas ejected from the air outlet will be ejected at different interfaces of the liquid, thereby ensuring the reaction effect of the overall liquid. At the same time, when bubbles are generated, the bubbles will flow downward along the water flow. Under the condition of changing water pressure of the water flow, the bubbles will be broken, thereby preventing the bubbles from floating on the surface of the liquid and exploding to take away the trifluoroacetyl chloride gas. At the same time, the water flow is flowing downward, which can make the water flow circulate up and down, further ensuring the synchronous reaction effect of the upper and lower liquids, ensuring the balance of the reaction, and ensuring the accuracy of the detection when the liquid sample is tested through the stratified valve.

[0007] Preferably, the air intake unit includes a first annular groove; the second rotating shaft is located in the fixed block and has a first annular groove on the shaft wall, and the first annular groove and the second cavity are connected to each other; a group of support columns are fixedly connected to the inner wall of the first annular groove; a second fixed column is fixedly connected to the center of the bottom end of the kettle body, and the second fixed column is located in the first cavity; an air intake pipe is provided at the bottom end of the second fixed column; a third cavity is opened in the second fixed column, and an air outlet groove is opened on the inner wall of the third cavity; a baffle is fixedly connected to the second fixed column, and the baffle is rotatably connected to the inner wall of the first cavity; the air intake pipe, the third cavity, the air outlet groove, the first cavity, the connecting pipe, the first annular groove, the second cavity, the connecting cavity and the air outlet are connected; during operation, because the second fixed column is fixedly set, at this time The second fixed column and the air inlet pipe are in a stationary state, the first rotating shaft rotates, and then the fixed block is driven to rotate through the connecting pipe, and the fixed block will drive the second rotating shaft to rotate around the first rotating shaft. At this time, the gas introduced through the air inlet pipe will enter the third cavity, and then flow into the first cavity through the air outlet groove. At this time, the baffle is in a state of dividing the first cavity, and the gas can only enter the second cavity through the connecting pipe through the first annular groove, and then be sprayed onto the blade surface of the spiral blade through the air outlet. Because the spiral blade rotates with the second rotating shaft, the water flow will flow along the spiral blade surface, so that the flowing water flow and gas can be easily dissolved and reacted, and the generated bubbles will be impacted downward at the same time, and then the generated bubbles will be broken by the impact force to ensure the dissolution effect of the gas.

[0008] Preferably, a second annular groove is provided on the inner wall of the bottom end of the kettle body; a first annular rack is fixedly connected to the inner wall of the second annular groove; the bottom end of the second rotating shaft passes through the fixed block and is located in the second annular groove, and a first gear is fixedly connected to the bottom end of the second rotating shaft; the first gear and the first annular rack are meshed with each other; during operation, because the first gear and the first annular rack are meshed with each other, and because of the support column in the first annular groove, the second rotating shaft remains a whole, and when the second rotating shaft rotates around the first rotating shaft, the first gear will mesh with the first annular rack, thereby driving the second rotating shaft to rotate, thereby completing the downward impact circulation of water, ensuring the circulation reaction effect, and reducing the generation of bubbles.

[0009] Preferably, an annular arc surface is provided on the outer side wall of the fixed block, and the annular arc surface is located directly below the spiral blade; when working, the fixed block is provided with an annular arc surface, and the water flow will collide with the annular arc surface when it impacts downward, and then spread out to the surroundings through the arc angle of the annular arc surface. The annular arc surface can ensure the dispersion effect, and the impact effect of the annular arc surface can also avoid the local accumulation of trifluoroacetyl chloride gas with a high concentration.

[0010] Preferably, a first annular plate is rotatably connected to the top of the kettle body; an inverted U-shaped rod is fixedly connected to the top of the kettle body, and the first annular plate is located in the middle of the inverted U-shaped rod; the first annular plate is fixedly connected to an electric telescopic rod, and the bottom end of the electric telescopic rod extends into the second cavity and is fixedly connected to a piston; the piston is sealingly and slidably connected to the inner wall of the second cavity; when working, in order to prevent trifluoroacetyl chloride gas from being ejected through the air outlet above the liquid level, the present invention is provided with a piston for this purpose, because the connecting chambers are a group of settings and are not connected to each other, so the connecting chamber located below the piston can eject trifluoroacetyl chloride gas, and the piston on the electric telescopic rod can prevent the air outlet above the liquid level from being ejected, and at the same time, the piston can be used to limit the gas ejection of trifluoroacetyl chloride gas, and the ejection of the air outlet at different internal positions of the liquid can be adjusted. When checking through the layered valve, if it is found that the sample concentration is uneven, the ejection of the air outlet can be controlled according to the adjustment of the piston position, so that the concentration of different layers of the liquid can be quickly balanced and adjusted to ensure the reaction quality.

[0011] Preferably, a group of axe-shaped plates are provided on the first rotating shaft; a pair of symmetrically distributed first arcuate surfaces are provided on both side walls of the axe-shaped plates, and a second arcuate surface is provided at the end of the axe-shaped plates; an elliptical cavity is formed between the first arcuate surfaces of adjacent axe-shaped plates in a group of the axe-shaped plates, and the second rotating shaft is located at the center of the elliptical cavity; the axe-shaped plates are rotated by the rotating member; the first arcuate surface is concavely set, and the second arcuate surface is convexly set; when working, the second rotating shaft is set in the elliptical cavity, and at this time, when the axe-shaped plate is rotated by the rotating member, when the spiral blade is rotating, bubbles will flow from the periphery of the spiral blade, and the axe-shaped plate will rotate. Because the axe-shaped plate is set with a long end at one end, when the axe-shaped plate rotates through the rotating part, the rotation speed of the axe-shaped plate is the slowest in the middle and increases to both ends in turn. The water flow dispersed by the spiral blades will flow through the middle part of the axe-shaped plate to both ends, thereby driving the bubbles inside the elliptical cavity. At the same time, due to the different rotation speeds of the axe-shaped plate, its water pressure is always in a high-speed changing state, which will cause the bubbles to be broken for the second time, further avoiding the generation of bubbles. At the same time, through the rotation of the axe-shaped plate, the water in the liquid can roll up and down, and at the same time, due to the excessively fast rotation speed of the end, the water flows from the inside to the outside, thereby ensuring the overall reaction effect and the uniformity of the reaction.

[0012] Preferably, a group of second annular racks are fixedly connected to the second fixed column; a third rotating shaft is fixedly connected to the end of the axe-shaped plate close to the first rotating shaft, and the third rotating shaft is rotatably connected to the first rotating shaft, one end of the third rotating shaft extends into the first cavity and is fixedly connected to a second gear; the second gear and the second annular rack are meshed with each other; during operation, the second fixed column is stationary, and the first rotating shaft rotates, driving the second gear and the second annular rack of the third rotating shaft to mesh with each other, thereby driving the third rotating shaft to rotate, and then driving the axe-shaped plate to rotate, thereby ensuring the breaking of bubbles.

[0013] Preferably, a group of corrugated grooves are opened on the outer side surface of the axe-shaped plate; a group of conical blocks are fixedly connected to the first arc surface; when working, the axe-shaped plate can use the tips of the corrugated grooves and the tips of the conical blocks to contact and break the bubbles, further reducing the generation of bubbles.

[0014] Preferably, a group of cleaning brushes are fixedly connected to the second curved surface; the cleaning brushes are corrosion-resistant, and the cleaning brushes are in contact with the inner wall of the kettle body; during operation, when the axe-shaped plate rotates, the second curved surface rotates to contact the inner wall of the kettle body through the cleaning brushes, thereby cleaning the kettle body, which can facilitate the subsequent cleaning of the kettle body.

[0015] Preferably, the inverted U-shaped rod is higher than the electric telescopic rod; when working, the inverted U-shaped rod is used to stabilize the top cover of the kettle body, because the electric telescopic rod will follow the second rotating shaft to drive the first annular plate to rotate, and because the inverted U-shaped rod is in a stable state and is higher than the top of the electric telescopic rod, there will be no interference between the two.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. The acylation kettle for producing 4-trifluoromethylnicotinic acid described in the present invention drives the second rotating shaft to rotate by the power unit, and then drives the spiral blade to rotate. When the spiral blade rotates, the water flow on the spiral blade is in a downward flow state. At this time, the gas ejected from the air outlet will be ejected at different interfaces of the liquid, thereby ensuring the reaction effect of the entire liquid. At the same time, when bubbles are generated, the bubbles will flow downward along the water flow. Under the condition of the changing water pressure of the water flow, the bubbles will be broken, thereby preventing the bubbles from floating on the surface of the liquid and bursting to take away the trifluoroacetyl chloride gas. At the same time, the water flow is flowing downward, which can make the water flow produce an up-and-down cycle, further ensuring the synchronous reaction effect of the upper and lower liquids, ensuring the balance of the reaction, and ensuring the accuracy of the detection when the liquid sample is detected through the layered valve;

[0018] 2. The acylation kettle for producing 4-trifluoromethylnicotinic acid described in the present invention is located in an elliptical cavity by setting a second rotating shaft. At this time, when the axe-shaped plate rotates through the rotating part, the spiral blades rotate, and bubbles will flow from the periphery of the spiral blades. At this time, the axe-shaped plate rotates. Because the axe-shaped plate is arranged with a long end at one end, when the axe-shaped plate rotates through the rotating part, the rotation speed of the axe-shaped plate is the slowest in the middle and increases toward both ends in sequence. The water flow dispersed by the spiral blades will flow through the middle of the axe-shaped plate to both ends, thereby driving the bubbles inside the elliptical cavity. At the same time, due to the different rotation speeds of the axe-shaped plate, its water pressure is always in a high-speed changing state, and the bubbles will be broken for the second time, further avoiding the generation of bubbles. At the same time, through the rotation of the axe-shaped plate, the water in the liquid can roll up and down, and at the same time, due to the excessively fast rotation speed of the end, the water flows from the inside to the outside, thereby ensuring the overall reaction effect and the uniformity of the reaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Figure 1 is a stereogram of the present invention;

[0021] Figure 2 is a cross-sectional view of the present invention;

[0022] Figure 3 yes Figure 2 A partial enlarged view of the middle part;

[0023] Figure 4 yes Figure 2 A partial enlarged view of point B in the middle;

[0024] Figure 5 yes Figure 2 A partial enlarged view of point C in the middle;

[0025] Figure 6 yes Figure 2 A partial enlarged view of point D in the middle;

[0026] Figure 7 is a partial cross-sectional view of the present invention;

[0027] Figure 8 is an exploded view of the second rotation axis;

[0028] Fig. 9 is an exploded view of the first rotation axis;

[0029] Fig.10 It is a horizontal display of the axe-shaped board;

[0030] Fig.11 It is a vertical display of the axe-shaped board;

[0031] Fig.12 yes Fig.11 Enlarged view of point E.

[0032] In the figure: 1, kettle body; 11, motor; 12, first rotating shaft; 13, first cavity; 14, connecting pipe; 15, fixed block; 16, second rotating shaft; 17, second cavity; 18, spiral blade; 19, connecting cavity; 191, air outlet; 2, first annular groove; 21, support column; 22, second fixed column; 23, air outlet groove; 24, air inlet pipe; 25, baffle; 26, second annular groove; 27, first annular rack; 28, first gear; 29, annular arc surface; 3, first annular plate; 31, inverted U-shaped rod; 32, electric telescopic rod; 33, piston; 34, axe-shaped plate; 35, first arc surface; 351, elliptical cavity 351; 36, second arc surface; 37, third rotating shaft; 38, second gear; 39, second annular rack; 4, corrugated groove; 41, conical block; 42, cleaning brush. Implementation

[0033] 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.

[0034] like Figures 1 to 12As shown, an acylation kettle for producing 4-trifluoromethylnicotinic acid according to an embodiment of the present invention comprises a kettle body 1; a motor 11 is fixedly connected at the center of the top end of the kettle body 1, and a first rotating shaft 12 is provided at the output end of the motor 11; the first rotating shaft 12 extends into the kettle body 1 and is rotatably connected to the center of the bottom end of the kettle body 1, and a first cavity 13 is provided in the first rotating shaft 12; a group of connecting pipes 14 are fixedly connected to the outer wall of the first rotating shaft 12 near the bottom end; a fixing block 15 is fixedly connected to the end of the connecting pipe 14; a second rotating shaft 16 is rotatably connected to the middle of the fixing block 15; the second rotating shaft 16 A second cavity 17 is provided inside the second rotating shaft 16; a spiral blade 18 is provided on the outer side wall of the second rotating shaft 16; a group of connecting cavities 19 are provided inside the spiral blade 18, and the connecting cavity 19 and the second cavity 17 are connected to each other; a group of air outlet holes 191 are provided on the spiral surface of the spiral blade 18; the second cavity 17 is inflated through the air intake unit, and the gas is ejected through the air outlet holes 191; the second rotating shaft 16 rotates by the power unit, so that the spiral blade 18 drives the water to flow downward; a group of layered valves are provided on the outer side wall of the kettle body 1; a feed valve and an air outlet valve are provided at the top of the kettle body 1;In the prior art, when trifluoroacetyl chloride is directly introduced from a trifluoroacetyl chloride cylinder into the acylation kettle, air is generally introduced from the bottom to ensure that the gas can be uniformly dissolved in the acylation kettle for chemical reaction. However, since the gas is charged from the bottom, the reaction efficiency of the liquid below the acylation kettle is higher than that of the liquid above the acylation kettle, resulting in an unbalanced overall reaction situation, affecting the overall reaction efficiency and quality. At the same time, since the trifluoroacetyl chloride gas in the acylation kettle is charged from the bottom, part of the gas will form bubbles in the liquid, explode at the liquid surface, and mix with the reaction waste gas and be discharged, wasting raw materials. At the same time, since the raw materials are generally put in according to a proportion, if too many bubbles explode at the liquid surface, more trifluoroacetyl chloride gas will be wasted, which will cause the overall reaction in the acylation kettle to be incomplete and affect the subsequent production quality. For this reason, the present invention is provided with a spiral blade 18 when working. After the trifluoroacetyl chloride gas is charged into the second cavity 17 through the air intake unit, the gas will enter the connecting cavity 19 and be ejected through the air outlet 191. At this time, due to the electric The machine 11 will drive the first rotating shaft 12 to rotate, and the first rotating shaft 12 will drive the fixed block 15 to rotate through the connecting pipe 14, and then drive the second rotating shaft 16 to rotate around the first rotating shaft 12, first stirring the liquid, and at the same time, the power unit will drive the second rotating shaft 16 to rotate, and then drive the spiral blade 18 to rotate, so that when the spiral blade 18 rotates, the water flow on the threaded blade is in a downward flow state, and at this time, the gas ejected from the air outlet 191 will be ejected at different interfaces of the liquid, thereby ensuring the reaction effect of the entire liquid, and at the same time, when bubbles are generated, the bubbles will flow downward along the water flow, and under the condition of the changing water pressure of the water flow, the bubbles will be broken, thereby preventing the bubbles from floating on the surface of the liquid and bursting to take away the trifluoroacetyl chloride gas, and at the same time, the water flow is flowing downward, which can make the water flow produce an up and down cycle, further ensuring the synchronous reaction effect of the upper and lower liquids, ensuring the balance of the reaction, and when the liquid sample is tested through the layered valve, the accuracy of the test can be guaranteed. ;

[0035] The air intake unit includes a first annular groove 2; the second rotating shaft 16 is located on the shaft wall in the fixed block 15 and is provided with a first annular groove 2, and the first annular groove 2 and the second cavity 17 are connected to each other; a group of supporting columns 21 are fixedly connected to the inner wall of the first annular groove 2; a second fixed column 22 is fixedly connected to the center of the bottom end of the kettle body 1, and the second fixed column 22 is located in the first cavity 13; an air intake pipe 24 is provided at the bottom end of the second fixed column 22; a third cavity is provided in the second fixed column 22, and an air outlet groove 23 is provided on the inner wall of the third cavity; a baffle 25 is fixedly connected to the second fixed column 22, and the baffle 25 is rotatably connected to the inner wall of the first cavity 13; the air intake pipe 24, the third cavity, the air outlet groove 23, the first cavity 13, the connecting pipe 14, the first annular groove 2, the second cavity 17, the connecting cavity 19 and the air outlet hole 191 are connected; when working, because the second fixed column 22 is a fixed device The second fixed column 22 and the air inlet pipe 24 are in a stationary state, the first rotating shaft 12 rotates, and then the fixed block 15 is driven to rotate through the connecting pipe 14, and the fixed block 15 will drive the second rotating shaft 16 to rotate around the first rotating shaft 12. At this time, the gas introduced through the air inlet pipe 24 will enter the third cavity, and then flow into the first cavity 13 through the air outlet groove 23. At this time, the baffle 25 is in a state of dividing the first cavity 13, and the gas can only pass through the connecting pipe 14 through the first annular groove 2 to enter the second cavity 17, and then be sprayed onto the blade surface of the spiral blade 18 through the air outlet hole 191. Because the spiral blade 18 rotates with the second rotating shaft 16, the water flow will flow along the spiral blade surface, so that the flowing water flow and the gas can be easily dissolved and reacted, and the generated bubbles are impacted downward, and then the generated bubbles are broken by the impact force to ensure the dissolution effect of the gas.

[0036] A second annular groove 26 is provided on the inner wall at the bottom end of the kettle body 1; a first annular rack 27 is fixedly connected to the inner wall of the second annular groove 26; the bottom end of the second rotating shaft 16 passes through the fixed block 15 and is located in the second annular groove 26, and a first gear 28 is fixedly connected to the bottom end of the second rotating shaft 16; the first gear 28 and the first annular rack 27 are meshed with each other; during operation, because the first gear 28 and the first annular rack 27 are meshed with each other, and because of the support column 21 in the first annular groove 2, the second rotating shaft 16 remains a whole. When the second rotating shaft 16 rotates around the first rotating shaft 12, the first gear 28 will mesh with the first annular rack 27, thereby driving the second rotating shaft 16 to rotate, thereby completing the downward impact circulation of the water flow, ensuring the circulation reaction effect, and reducing the generation of bubbles.

[0037] An annular arc surface 29 is provided on the outer side wall of the fixing block 15, and the annular arc surface 29 is located directly below the spiral blade 18; when working, the annular arc surface 29 is provided on the fixing block 15, and the water flow will collide with the annular arc surface 29 when impacting downward, and then disperse to the surroundings through the arc angle of the annular arc surface 29. The annular arc surface 29 can ensure the dispersion effect, and the impact effect of the annular arc surface 29 can also avoid the local accumulation of trifluoroacetyl chloride gas with a high concentration.

[0038] The first annular plate 3 is rotatably connected to the top of the kettle body 1; an inverted U-shaped rod 31 is fixedly connected to the top of the kettle body 1, and the first annular plate 3 is located in the middle of the inverted U-shaped rod 31; the first annular plate 3 is fixedly connected to the electric telescopic rod 32, and the bottom end of the electric telescopic rod 32 extends into the second cavity 17 and is fixedly connected to a piston 33; the piston 33 is sealingly slidably connected to the inner wall of the second cavity 17; when working, the present invention is at work, in order to prevent trifluoroacetyl chloride gas from being ejected through the gas outlet 191 above the liquid level, a piston 33 is provided for this purpose, because the connecting cavity 19 is a group of settings, and the connecting cavity 19 is mutually The connecting chamber 19 below the piston 33 can spray out trifluoroacetyl chloride gas. The piston 33 on the electric telescopic rod 32 can prevent the gas outlet 191 from spraying out above the liquid surface. At the same time, the piston 33 can limit the gas spraying of trifluoroacetyl chloride gas, and the spraying of the gas outlet 191 at different positions inside the liquid can be adjusted. When checking through the stratified valve, if it is found that the sample concentration is uneven, the spraying of the gas outlet 191 can be controlled according to the position of the piston 33, so that the concentration of different layers of the liquid can be quickly balanced and adjusted to ensure the reaction quality.

[0039] A group of axe-shaped plates 34 are provided on the first rotating shaft 12; a pair of symmetrically distributed first arc surfaces 35 are provided on the two side walls of the axe-shaped plates 34, and a second arc surface 36 is provided at the end of the axe-shaped plates 34; an elliptical cavity 351 is formed between the first arc surfaces 35 of adjacent axe-shaped plates 34 in a group of the axe-shaped plates 34, and the second rotating shaft 16 is located at the center of the elliptical cavity 351; the axe-shaped plates 34 are rotated by the rotating member; the first arc surface 35 is concave, and the second arc surface 36 is convex; when working, the second rotating shaft 16 is located in the elliptical cavity 351, and at this time, when the axe-shaped plate 34 is rotated by the rotating member, bubbles will flow from the periphery of the spiral blade 18 when the spiral blade 18 is rotating. Dispersion, at this time the axe-shaped plate 34 rotates, because the axe-shaped plate 34 is set with a long end, when the axe-shaped plate 34 rotates through the rotating part, the rotation speed of the axe-shaped plate 34 is the slowest in the middle and increases toward both ends in turn, and the water flow dispersed by the spiral blades 18 will flow through the middle of the axe-shaped plate 34 to both ends, thereby driving the bubbles inside the elliptical cavity 351, and at the same time, due to the different rotation speeds of the axe-shaped plate 34, its water pressure is always in a high-speed changing state, and the bubbles will be broken for the second time, further avoiding the generation of bubbles, and at the same time, through the rotation of the axe-shaped plate 34, the water in the liquid can roll up and down, and at the same time, due to the excessively fast rotation speed of the end, the water flows from the inside to the outside, thereby ensuring the overall reaction effect and ensuring the uniformity of the reaction.

[0040] A group of second annular racks 39 are fixedly connected to the second fixed column 22; a third rotating shaft 37 is fixedly connected to the end of the axe-shaped plate 34 close to the first rotating shaft 12, and the third rotating shaft 37 is rotatably connected to the first rotating shaft 12, one end of the third rotating shaft 37 extends into the first cavity 13 and is fixedly connected to a second gear 38; the second gear 38 and the second annular rack 39 are meshed with each other; during operation, the second fixed column 22 is stationary, and the first rotating shaft 12 rotates, driving the second gear 38 and the second annular rack 39 of the third rotating shaft 37 to mesh with each other, thereby driving the third rotating shaft 37 to rotate, and then driving the axe-shaped plate 34 to rotate, thereby ensuring the breaking of bubbles.

[0041] A group of corrugated grooves 4 are provided on the outer side of the axe-shaped plate 34; a group of conical blocks 41 are fixedly connected to the first arc-shaped surface 35; when working, the axe-shaped plate 34 can use the tips of the corrugated grooves 4 and the tips of the conical blocks 41 to contact and break the bubbles, further reducing the generation of bubbles.

[0042] A group of cleaning brushes 42 are fixedly connected to the second curved surface 36; the cleaning brushes 42 are corrosion-resistant, and the cleaning brushes 42 and the inner wall of the kettle body 1 are in contact with each other; during operation, when the axe-shaped plate 34 rotates, the second curved surface 36 rotates to contact the inner wall of the kettle body 1 through the cleaning brushes 42, and then performs cleaning, which can facilitate the subsequent cleaning effect of the kettle body 1.

[0043] The inverted U-shaped rod 31 is higher than the electric telescopic rod 32; when working, the inverted U-shaped rod 31 is used to stabilize the top cover of the kettle body 1, because the electric telescopic rod 32 will follow the second rotating shaft 16 to drive the first annular plate 3 to rotate. Since the inverted U-shaped rod 31 is in a stable state and is higher than the top of the electric telescopic rod 32, there will be no interference between the two.

[0044] Working principle: spiral blades 18 are provided. After trifluoroacetyl chloride gas is filled into the second cavity 17 through the air intake unit, the gas introduced through the air intake pipe 24 will enter the third cavity, and then flow into the first cavity 13 through the air outlet groove 23. At this time, the baffle 25 is in a state of dividing the first cavity 13. The gas can only pass through the connecting pipe 14 through the first annular groove 2 to enter the second cavity 17, and will enter the connecting cavity 19 and be ejected through the air outlet 191. At this time, the motor 11 will drive the first rotating shaft 12 to rotate, and the first rotating shaft 12 will drive the fixed block 15 to rotate through the connecting pipe 14, and then drive the second rotating shaft 16 to rotate around the first rotating shaft 12, so as to first stir the liquid. The gear 28 and the first annular rack 27 are meshed with each other. At the same time, due to the support column 21 in the first annular groove 2, the second rotating shaft 16 is still a whole. When the second rotating shaft 16 rotates around the first rotating shaft 12, the first gear 28 will mesh with the first annular rack 27, thereby driving the second rotating shaft 16 to rotate, and then driving the spiral blade 18 to rotate. When the spiral blade 18 rotates, the water flow on the threaded blade is in a downward flow state. At this time, the gas ejected from the air outlet 191 will be ejected at different interfaces of the liquid, thereby ensuring the reaction effect of the overall liquid. At the same time, when bubbles are generated at this time, the bubbles will flow downward along the water flow. Under the condition of changing water pressure of the water flow, the bubbles will be broken. The second rotating shaft 16 is located in the elliptical cavity 351, and the second fixed column 22 is stationary. At this time, the first rotating shaft 12 rotates, driving the second gear 38 and the second annular rack 39 of the third rotating shaft 37 to engage with each other, thereby driving the third rotating shaft 37 to rotate, and then driving the axe-shaped plate 34 to rotate. At this time, when the spiral blade 18 rotates, bubbles will disperse from the periphery of the spiral blade 18. At the same time, the axe-shaped plate 34 rotates, because the axe-shaped plate 34 is set with a long end. When the axe-shaped plate 34 rotates through the rotating part, the rotation speed of the axe-shaped plate 34 is the slowest in the middle and increases toward both ends in turn. The water flow dispersed by the spiral blades 18 will flow through the middle of the axe-shaped plate 34 to both ends, thereby driving the bubbles inside the elliptical cavity 351. At the same time, due to the different rotation speeds of the axe-shaped plate 34, its water pressure is always in a high-speed changing state, and the bubbles will be broken for the second time, further avoiding the generation of bubbles. At the same time, through the rotation of the axe-shaped plate 34, the water in the liquid can roll up and down, and at the same time, due to the excessively fast rotation speed of the end, the water flows from the inside to the outside, thereby ensuring the overall reaction effect and ensuring the uniformity of the reaction.

[0045] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1As 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.

[0046] 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.

[0047] 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. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An acylation kettle for producing 4-trifluoromethylnicotinic acid, characterized in that: The invention comprises a kettle body (1); a motor (11) is fixedly connected at the center of the top end of the kettle body (1), and a first rotating shaft (12) is provided at the output end of the motor (11); the first rotating shaft (12) extends into the kettle body (1) and is rotatably connected to the center of the bottom end of the kettle body (1), and a first cavity (13) is provided in the first rotating shaft (12); a group of connecting pipes (14) are fixedly connected to the outer wall of the first rotating shaft (12) near the bottom end; a fixing block (15) is fixedly connected to the end of the connecting pipe (14); a second rotating shaft (16) is rotatably connected to the middle of the fixing block (15); a second cavity (17) is provided in the second rotating shaft (16); A spiral blade (18) is provided on the outer wall of the second rotating shaft (16); a group of connecting cavities (19) are provided in the spiral blade (18), and the connecting cavities (19) and the second cavity (17) are connected to each other; a group of air outlet holes (191) are provided on the spiral surface of the spiral blade (18); the second cavity (17) is inflated through the air intake unit, and the gas is ejected through the air outlet holes (191); the second rotating shaft (16) is rotated by the power unit, so that the spiral blade (18) drives the water to flow downward; a group of layered valves are provided on the outer wall of the kettle body (1); a feed valve and an air outlet valve are provided at the top of the kettle body (1); The air intake unit comprises a first annular groove (2); the first annular groove (2) is provided on the shaft wall of the second rotating shaft (16) located in the fixed block (15), and the first annular groove (2) and the second cavity (17) are communicated with each other; a group of support columns (21) are fixedly connected to the inner wall of the first annular groove (2); a second fixed column (22) is fixedly connected to the center of the bottom end of the kettle body (1), and the second fixed column (22) is located in the first cavity (13); an air intake is provided at the bottom end of the second fixed column (22). The second fixing column (22) has a third cavity formed therein, and an air outlet groove (23) is formed on the inner wall of the third cavity; a baffle (25) is fixedly connected to the second fixing column (22), and the baffle (25) is rotatably connected to the inner wall of the first cavity (13); the air inlet pipe (24), the third cavity, the air outlet groove (23), the first cavity (13), the connecting pipe (14), the first annular groove (2), the second cavity (17), the connecting cavity (19) and the air outlet hole (191) are connected; A second annular groove (26) is formed on the inner wall of the bottom end of the kettle body (1); a first annular rack (27) is fixedly connected to the inner wall of the second annular groove (26); the bottom end of the second rotating shaft (16) passes through the fixed block (15) and is located in the second annular groove (26), and a first gear (28) is fixedly connected to the bottom end of the second rotating shaft (16); the first gear (28) and the first annular rack (27) are meshed with each other; An annular arc surface (29) is provided on the outer side wall of the fixing block (15), and the annular arc surface (29) is located directly below the spiral blade (18); A first annular plate (3) is rotatably connected to the top of the kettle body (1); an inverted U-shaped rod (31) is fixedly connected to the top of the kettle body (1), and the first annular plate (3) is located in the middle of the inverted U-shaped rod (31); an electric telescopic rod (32) is fixedly connected to the first annular plate (3), and the bottom end of the electric telescopic rod (32) extends into the second cavity (17) and is fixedly connected to a piston (33); the piston (33) is sealingly slidably connected to the inner wall of the second cavity (17); A group of axe-shaped plates (34) are provided on the first rotating shaft (12); a pair of symmetrically distributed first arc-shaped surfaces (35) are provided on the two side walls of the axe-shaped plate (34), and a second arc-shaped surface (36) is provided at the end of the axe-shaped plate (34); an elliptical cavity (351) is formed between the first arc-shaped surfaces (35) of adjacent axe-shaped plates (34) in a group of the axe-shaped plates (34), and the second rotating shaft (16) is located at the center of the elliptical cavity (351); the axe-shaped plate (34) is rotated by a rotating member; the first arc-shaped surface (35) is concave, and the second arc-shaped surface (36) is convex.

2. The acylation kettle for producing 4-trifluoromethylnicotinic acid according to claim 1, characterized in that: A group of second annular racks (39) are fixedly connected to the second fixed column (22); a third rotating shaft (37) is fixedly connected to the end of the axe-shaped plate (34) close to the first rotating shaft (12), and the third rotating shaft (37) is rotatably connected to the first rotating shaft (12), one end of the third rotating shaft (37) extends into the first cavity (13) and is fixedly connected to a second gear (38); the second gear (38) and the second annular rack (39) are meshed with each other.

3. The acylation kettle for producing 4-trifluoromethylnicotinic acid according to claim 2, characterized in that: A group of corrugated grooves (4) are provided on the outer side surface of the axe-shaped plate (34); and a group of conical blocks (41) are fixedly connected to the first arc-shaped surface (35).

4. The acylation kettle for producing 4-trifluoromethylnicotinic acid according to claim 3, characterized in that: A group of cleaning brushes (42) are fixedly connected to the second arc-shaped surface (36); the cleaning brushes (42) are corrosion-resistant, and the cleaning brushes (42) and the inner wall of the kettle body (1) are in contact with each other.

5. The acylation kettle for producing 4-trifluoromethylnicotinic acid according to claim 4, characterized in that: The inverted U-shaped rod (31) is higher than the electric telescopic rod (32).

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