Nifuratel raw material extraction device

Abstract

The invention provides a nifuratel raw material extraction device, and relates to the technical field of raw material extraction. The nifuratel raw material extraction device comprises an extraction tower, a light phase outlet formed in the top of the extraction tower, a heavy phase inlet formed in the position, close to the upper portion, of the left side of the extraction tower, a light phase inlet formed in the position, close to the lower portion, of the left side of the extraction tower and a heavy phase outlet formed in the bottom of the extraction tower. A plurality of rotary trays which are distributed in a linear array manner are mounted on the rotary table driving and rotating mechanism, a plurality of fixing rings are fixedly connected to the inner side wall of the extraction tower, and the plurality of rotary trays are arranged between every two adjacent fixing rings. The problem that the mass transfer efficiency is greatly reduced due to backmixing and uneven liquid distribution when the intermediate raw material 5-nitrofurfural diethyl ester of nifuratel is extracted is solved, and meanwhile, the floating discs floating in different layer areas are utilized to adapt to the mass transfer conditions of different layer areas so as to improve the mass transfer efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of raw material extraction, in particular to a device for extracting nifuratel raw materials. Background Art

[0002] Nifuratel is an important antibacterial drug, which has a strong killing effect on various pathogens such as Gram-positive and Gram-negative bacteria, Trichomonas, mold, Chlamydia and Mycoplasma. It is widely used in clinical treatment of diseases such as vaginal infections caused by bacteria, Trichomonas and Candida albicans. 5-Nitrofurfural diethyl ester is one of the key starting materials for the synthesis of nifuratel. In drug synthesis, 5-Nitrofurfural diethyl ester is a key intermediate, which can be synthesized into nifuratel through a series of reactions. In the preparation process, hydrolysis reaction is often used to convert it into 5-nitrofurfural, such as hydrolysis with dilute acid in organic alcohol, but there are many side reactions and impurities, resulting in low yield and purity. In order to improve its yield and purity, there are continuous improvement methods. At the same time, in the relevant production process, the extraction operation of 5-Nitrofurfural diethyl ester is often involved to achieve more efficient separation and purification, providing better quality raw materials for the synthesis of nifuratel.

[0003] However, the extraction of 5-nitrofurfural diethyl ester involves the interaction of substances in different phases. Due to the difference in the properties of the substances and the change in the operating conditions, the interfacial tension will have an adverse effect on the distribution of the liquid on the tower plate. The difference in the interfacial tension between different substances makes it difficult for the liquid to spread and flow evenly on the tower plate, so that 5-nitrofurfural diethyl ester may form larger droplets or aggregate into clumps, hindering the smooth flow of the liquid, causing liquid accumulation or drying up in local areas, destroying the phase equilibrium state, and reducing the mass transfer efficiency; secondly, the difference in the solubility of 5-nitrofurfural diethyl ester and the change in the operating conditions in the extraction tower will affect the flow state of the liquid in the tower, and then lead to the mixing phenomenon between materials with different residence times (hereinafter referred to as backmixing), and backmixing will lead to a decrease in the mass transfer efficiency of 5-nitrofurfural, causing the materials with different residence times to mix, destroying the orderly contact, affecting the transfer speed of the solute between the two phases, and reducing the extraction efficiency. On the other hand, it will destroy the phase equilibrium, change the concentration and pressure distribution in the tower, and make the separation effect worse. Based on the above viewpoints, the present invention provides a device for extracting nitrofuratel raw materials. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a device for extracting nifuratel raw materials, which solves the problem of back mixing and uneven liquid distribution during the extraction of nifuratel's intermediate raw material - 5-nitrefurfural diethyl ester, resulting in a greatly reduced mass transfer efficiency. At the same time, floating plates floating in different layers are used to adapt to the mass transfer conditions in different layers to improve the mass transfer efficiency.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a nifuratel raw material extraction device, comprising an extraction tower, a light phase outlet arranged at the top of the extraction tower, a heavy phase inlet arranged at the upper left side of the extraction tower, a light phase inlet arranged at the lower left side of the extraction tower, and a heavy phase outlet arranged at the bottom of the extraction tower, a turntable is installed on the top of the extraction tower to drive rotation, and a plurality of rotating tower plates distributed in a linear array are installed on the turntable to drive rotation, a plurality of fixed rings are fixedly connected to the inner side wall of the extraction tower, and a plurality of the rotating tower plates are arranged between every two adjacent fixed rings, the rotating tower plate comprises a fixed turntable, the fixed turntable comprises a fixed disk body, a plurality of fixed valve ports distributed in a circumferential array are fixedly connected above the fixed disk body, a floating valve disk is slidably connected to the upper limit position of the inner side wall of the fixed valve port, the floating valve disk comprises a floating disk, a plurality of floating valve plates distributed in a circumferential array are installed on the floating disk, and a plurality of the floating valve plates are respectively arranged directly below the plurality of fixed valve ports; A pressure storage plate is fixedly connected to the bottom of the floating plate, and the pressure storage plate includes a pressure storage plate, a pressure chamber is opened inside the pressure storage plate, and a plurality of exhaust holes are opened on the top of the pressure storage plate, and sealing steel balls are arranged in the exhaust holes opened on the top of the pressure storage plates, and a plurality of spring seats are fixedly connected to the top of the pressure storage plate, and the plurality of spring seats are respectively placed on the outside of the plurality of sealing steel balls, and the plurality of sealing steel balls are respectively fixedly connected to the plurality of sealing steel balls through springs.

[0006] Preferably, a plurality of push rods in a circular array are fixedly connected to the lower side wall of the floating plate, and the plurality of push rods are respectively arranged directly above a plurality of sealing steel balls.

[0007] Preferably, a pressure injection valve is installed on the outer side wall of the pressure storage plate.

[0008] Preferably, the turntable driving rotation includes a turntable driving motor, a movable shaft of the turntable driving motor is connected to a reversing reducer, and a driving shaft is connected to the longitudinal output end of the reversing reducer.

[0009] Preferably, several of the light phase outlets are limitedly slidably connected to the driving shaft, and a connecting plate is fixedly connected just above the fixed disk body, an adjustable distance tube core is fixedly connected to the inner wall of the connecting plate, and the adjustable distance tube core includes a tube sleeve, and several liquid storage tubes are fixedly connected to the outer wall of the driving shaft, the tops and bottoms of several of the liquid storage tubes located in the middle position are respectively sleeved on the outer walls of two adjacent tube sleeves, and the two liquid storage tubes located at the top and the bottom are respectively sleeved on the outer walls of the tube sleeve located at the top and the tube sleeve located at the bottom, and through holes for drainage are opened on the end faces of the two liquid storage tubes located at the top and the bottom.

[0010] Preferably, a plurality of connecting bent rods are fixedly connected to the inner side wall of the floating plate, and the other end of each connecting bent rod is fixedly connected to a push piston plate.

[0011] Preferably, a pitch-adjusting curved tube is fixedly connected to the outer wall of the tube sleeve, and a spring adjusting member is fixedly connected to the inside of the pitch-adjusting curved tube, a capillary tube and a one-way valve are respectively connected to the middle position of the outer side of the tube wall of the pitch-adjusting curved tube, and a pushing piston is slidingly connected to the top and bottom of the tube sleeve, and a return spring is fixedly connected between the two pushing pistons.

[0012] Preferably, the spring adjusting member is composed of a plate body fixed inside the pitch adjusting curved tube, a spring fixed below the plate body, and a piston plate connected to the bottom of the spring and limitedly slidably connected to the inner wall of the pitch adjusting curved tube.

[0013] The present invention has the following technical points and beneficial effects: 1. During the extraction process, as the extraction proceeds, the phase with high density sinks and the phase with low density floats, and obvious stratification occurs in the extraction tower. The floating plate with high density in the lower layer floats compared to the fixed plate. Since the fixed valve port is a conical structure, the discharge port opening formed between the fixed valve port and the floating valve plate in the high-density layer area is reduced. Reducing the discharge port opening can slow down the liquid flow rate, increase the contact time of the light phase and the heavy phase on the tower plate, increase the solute transfer opportunity, and reduce the situation of one phase being entrained by another phase. Using a smaller opening in the high-density layer area can reduce the entrainment phenomenon, making the flow of the two phases in the tower more independent and orderly.

[0014] 2. During the extraction process, the liquid forms large droplets or aggregates at the fixed valve port due to interfacial tension, which hinders the smooth flow of the liquid, preventing the liquid and air from flowing out, and causing bubbles to gather under the tower plate. Bubbles are constantly formed and burst to impact the floating plate, causing the top rod to press down the sealing steel ball, which causes the spring seat spring to deform, and the gas in the pressure chamber overflows and impacts the fixed valve port, driving the floating valve disc to rise. When the floating valve disc rises, the floating valve plate exceeds the top of the fixed valve port, breaking the liquid blockage state and allowing the accumulated liquid to flow again, ensuring the continuous and stable mass transfer process, ensuring the long-term stable operation of the equipment, reducing the number and time of downtime for maintenance, and improving production efficiency.

[0015] 3. When back-mixing occurs in the extraction tower, the unstable flow of the fluid caused by back-mixing and the turbulence and vortex generated will continuously impact the floating plate, causing the floating plate to float up and down in the fixed plate body. During the floating process of the floating plate, the top piston plate is driven to rise and fall in the pitch-adjusting curved tube by the connecting crankshaft. Due to the rapid floating change of the floating plate, the liquid in the pitch-adjusting curved tube cannot be completely discharged through the capillary. The liquid pushed upward squeezes the piston plate at the bottom of the spring adjustment part to move it upward, pushing the liquid in the upper section of the pitch-adjusting curved tube into the tube sleeve. As the volume of the liquid inside the tube sleeve increases, the piston is pushed outward to push the liquid in the liquid storage tube, so that the rotating tower plates on the upper and lower sides of the back-mixing area are away from the tower plates in the back-mixing area. By increasing the spacing between the rotating tower plates, a larger mass transfer space is provided, so that the liquid has more space to diffuse during the falling or rising process, reducing local liquid accumulation and uneven flow, improving mass transfer efficiency, reducing back-mixing caused by insufficient mass transfer, and stabilizing the gas-liquid two-phase interface at the same time, reducing local mixing and back-mixing caused by interface fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 is a cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the connection between the turntable driving rotation and the rotating tower plate and the liquid storage pipe in the present invention; Figure 4 It is a schematic diagram of the rotating tower plate in the present invention; Figure 5 It is an exploded view of the rotating tower plate in the present invention; Figure 6 A top view of the rotating tower plate of the present invention; Figure 7 for Figure 6 Isometric section view along AA; Figure 8 for Figure 7 The enlarged schematic diagram of point B in the middle; Fig. 9 It is a schematic diagram of the connection of adjacent rotating tower plates in the present invention; Fig.10 It is a cross-sectional view of adjacent rotating tower plates in the present invention.

[0017] Among them, 1. extraction tower; 2. light phase outlet; 3. heavy phase inlet; 4. fixed ring; 5. heavy phase outlet; 6. light phase inlet; 7. turntable drive rotation; 8. liquid storage tube; 9. rotating tower plate; 71. Turntable drive motor; 72. Reversing reducer; 73. Drive shaft; 91. Fixed rotary disc; 92. Floating valve disc; 93. Pressure accumulator disc; 94. Adjustable distance tube core; 911, fixed disc body; 912, fixed valve port; 913, connecting disc; 921, floating plate; 922, floating valve plate; 923, connecting bent rod; 924, pushing piston plate; 925, push rod; 931, pressure storage plate; 932, pressure chamber; 933, injection valve; 934, sealing steel ball; 935, spring seat; 941. Pipe sleeve; 942. Pitch-adjusting curved pipe; 943. Spring adjustment member; 944. One-way valve; 945. Capillary tube; 946. Push piston; 947. Return spring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Embodiment 1: Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, an embodiment of the present invention provides a nifuratel raw material extraction device, a nifuratel raw material extraction device, comprising an extraction tower 1, a light phase outlet 2 arranged at the top of the extraction tower 1, a heavy phase inlet 3 arranged at the upper left side of the extraction tower 1, a light phase inlet 6 arranged at the lower left side of the extraction tower 1, and a heavy phase outlet 5 arranged at the bottom of the extraction tower 1. When extracting 5-nitrefuraldehyde diethyl ester, 5-nitrefuraldehyde diethyl ester is added into the extraction tower 1 from the heavy phase inlet 3 as a heavy phase, and an organic solvent is added into the extraction tower 1 from the light phase inlet 6 as a light phase. 1, a turntable driving rotation 7 is installed on the top of the extraction tower 1, and a plurality of rotating tower plates 9 distributed in a linear array are installed on the turntable driving rotation 7, a plurality of fixed rings 4 are fixedly connected to the inner side wall of the extraction tower 1, and a plurality of rotating tower plates 9 are arranged between every two adjacent fixed rings 4, and the rotating tower plates 9 include a fixed turntable 91, and the fixed turntable 91 includes a fixed disk body 911, and a plurality of fixed valve ports 912 distributed in a circumferential array are fixedly connected above the fixed disk body 911, and a floating valve disk 92 is slidably connected to the upper limit position of the inner side wall of the fixed valve port 912, and the floating valve disk 92 includes a floating plate 921, on which a plurality of floating valve plates 922 arranged in a circumferential array are installed. The plurality of floating valve plates 922 are respectively arranged directly below the plurality of fixed valve ports 912. As the extraction proceeds, the phase with a high density will sink under the action of gravity, while the phase with a low density will float up, and obvious stratification will occur in the extraction tower. As the stratification proceeds, the floating plate 921 with a high density in the lower layer will float up compared to the fixed plate 911. Since the fixed valve ports 912 are in a conical structure, the fixed valve ports 912 in the layer with a high density and the floating valve plates will be The opening of the outlet formed between 922 is reduced. By reducing the opening of the outlet, the flow rate of the liquid in this area is slowed down, which makes the light phase and the heavy phase have more time to contact each other on the tower plate, thereby increasing the chance of solute transfer from one phase to another. At the same time, reducing the opening can reduce the situation of one phase being entrained by another phase. If the tower plate opening is large and the flow rate is fast, one phase may be entrained too much by another phase, resulting in a decrease in mass transfer effect. Using a smaller opening in the high-density layer area can reduce this entrainment phenomenon and make the flow of the two phases in the tower more independent and orderly.

[0020] like Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the bottom of the floating plate 921 is fixedly connected with a pressure storage plate 93, and the pressure storage plate 93 includes a pressure storage plate 931. The pressure storage plate 931 has a pressure chamber 932, and a plurality of exhaust holes are opened on the top of the pressure storage plate 931. Sealing steel balls 934 are arranged in the exhaust holes opened on the tops of the plurality of pressure storage plates 931, and a plurality of spring seats 935 are fixedly connected to the top of the pressure storage plate 931. The plurality of spring seats 935 are respectively placed on the outsides of the plurality of sealing steel balls 934. The plurality of sealing steel balls 934 are elastically pressed against the pressure storage plate 931. The springs are fixedly connected to a plurality of sealing steel balls 934, and a plurality of push rods 925 in a circumferential array are fixedly connected to the lower side wall of the floating plate 921. The plurality of push rods 925 are respectively arranged directly above the plurality of sealing steel balls 934. A pressure injection valve 933 is installed on the outer side wall of the pressure storage plate 931. The high-pressure gas source is added to the pressure storage plate 931 through the pressure injection valve 933. When the liquid forms larger droplets or aggregates due to the interfacial tension on the fixed valve port 912, the smooth flow of the liquid is hindered. The air cannot flow out, and the space below the tower plate is gradually occupied, and bubbles will gather under the tower plate to form. As the bubbles are continuously formed and burst, they will continuously impact the floating plate 921, causing the top rod 925 to press the sealing steel ball 934 downward. When the sealing steel ball 934 is pressed downward to the spring of the spring seat 935, the spring is deformed downward, and the gas originally stored in the pressure chamber 932 escapes, and then impacts the fixed valve port 912 and drives the entire floating valve plate 92 to rise together through the floating plate 921. When the floating valve plate 92 rises, the floating valve plate 922 will exceed the top of the fixed valve port 912. In this upward movement process, the blocked state of the liquid can be gradually broken, and the accumulated liquid can start to flow again, ensuring that the mass transfer process can be carried out continuously and stably, ensuring that the equipment can operate stably for a long time, reducing the number and time of shutdown maintenance, and improving production efficiency. At the same time, if the impurities precipitated from the heavy phase outlet 5-nitrofurfural diethyl ester agglomerate during extraction and block the floating valve plate 922, the impurity agglomerates can also be removed by the rising floating plate 921.

[0021] like Figure 2 and Figure 3 As shown, the turntable drive 7 includes a turntable drive motor 71, a reversing reducer 72 is connected to the movable shaft of the turntable drive motor 71, and a driving shaft 73 is connected to the longitudinal output end of the reversing reducer 72. The turntable drive motor 71 drives the driving shaft 73 to rotate rapidly through the reversing reducer 72, and utilizes the shear stress generated by the rotation to break the dispersed phase into many fine droplets, thereby increasing the actual contact area and the mass transfer coefficient, and strengthening the mass transfer process. The fixed rings 4 arranged at the upper and lower ends of the rotating tower plate 9 can suppress axial back mixing to a certain extent, so that the contact and mass transfer of the two phases in the tower are more sufficient and stable, and the mass transfer efficiency is further improved.

[0022] Embodiment 2: Fig. 9 and Fig.10As shown, a pitch-adjusting curved tube 942 is fixedly connected to the outer wall of the tube sleeve 941, and a spring adjusting member 943 is fixedly connected inside the pitch-adjusting curved tube 942. A capillary 945 and a one-way valve 944 are respectively connected to the middle position of the outer side of the tube wall of the pitch-adjusting curved tube 942, and a push piston 946 is limitedly slidably connected to the top and bottom of the tube sleeve 941, and a return spring 947 is fixedly connected between the two push pistons 946. The spring adjusting member 943 is composed of a plate body fixed inside the pitch-adjusting curved tube 942, a spring fixed under the plate body, and a piston plate connected to the bottom of the spring and limitedly slidably connected to the inner wall of the pitch-adjusting curved tube 942. When back mixing occurs in the extraction tower 1, the back mixing causes the fluid in the extraction tower 1 to be unstable. The fixed flow and back mixing generate turbulence and vortex, which will continuously impact the floating plate 921, causing the floating plate 921 to continuously float up and down inside the fixed plate body 911. During the floating up and down process of the floating plate 921, the connecting bent rod 923 will drive the push piston plate 924 to rise and fall in the pitch-adjusting curved tube 942. Since the floating process of the floating plate 921 caused by the back mixing is rapidly changing, at this time, the liquid stored in the pitch-adjusting curved tube 942 cannot be completely discharged through the capillary 945, and the liquid pushed upward will squeeze the piston plate at the bottom of the spring adjusting member 943, causing the piston plate to move upward. When the piston plate moves upward, the liquid originally stored in the upper section of the pitch-adjusting curved tube 942 will be pushed into the interior of the pipe sleeve 941.

[0023] like Fig. 9 and Fig.10As shown, this embodiment provides another technical solution based on the first embodiment, a plurality of light phase outlets 2 are all limitedly slidably connected to the driving shaft 73, and a connecting plate 913 is fixedly connected just above the fixed plate body 911, and a distance-adjusting tube core 94 is fixedly connected to the inner side wall of the connecting plate 913, and the distance-adjusting tube core 94 includes a tube sleeve 941, and a plurality of liquid storage tubes 8 are fixedly connected to the outer side wall of the driving shaft 73, and the top and bottom of the plurality of liquid storage tubes 8 located in the middle position are respectively sleeved on the outer side walls of two adjacent tube sleeves 941, and the two liquid storage tubes 8 located at the top and the bottom are respectively sleeved on the outer side walls of the tube sleeve 941 located at the top and the tube sleeve 941 located at the bottom, and through holes for draining liquid are provided on the end faces of the two liquid storage tubes 8 located at the top and the bottom, and a plurality of connecting bent rods 923 are fixedly connected to the inner side wall of the floating plate 921, and the other end of each connecting bent rod 923 is fixedly connected to a top piston plate 924, and as the tube sleeve As the volume of the liquid inside 941 increases, the push pistons 946 on the upper and lower sides of the tube sleeve 941 begin to push outward, thereby pushing the liquid stored in the liquid storage tube 8, so that the rotating tower plates 9 on the upper and lower sides of the back-mixing area are away from the tower plates where the back-mixing area occurs. By increasing the spacing between the rotating tower plates 9, a larger mass transfer space is provided, so that the liquid has more space to diffuse during the falling or rising process, reducing local liquid accumulation and uneven flow, improving mass transfer efficiency, reducing back-mixing caused by insufficient mass transfer, and stabilizing the phase interface between the gas and liquid phases, reducing local mixing and back-mixing caused by interface fluctuations. When the back-mixing situation is stable, the floating plate 921 no longer floats up and down, and the reset spring 947 pulls the two push pistons 946 to reset, thereby restoring the spacing between the rotating tower plates 9 to normal. At the same time, when the floating plate 921 floats normally, the liquid at the bottom of the spring adjusting member 943 is discharged through the capillary 945 and flows back through the spring adjusting member 943 into the pitch-adjusting curved pipe 942.

[0024] Working principle: When extracting 5-nitrofurfural diethyl ester, 5-nitrofurfural diethyl ester is added as a heavy phase from the heavy phase inlet 3 into the extraction tower 1, and the organic solvent is added as a light phase from the light phase inlet 6 into the extraction tower 1. Then the turntable drive motor 71 drives the drive shaft 73 to rotate rapidly through the reversing reducer 72. The shear stress generated by the rotation is used to break the dispersed phase into many tiny droplets, thereby increasing the actual contact area and the mass transfer coefficient and strengthening the mass transfer process. The fixed rings 4 arranged at the upper and lower ends of the rotating tower plate 9 can inhibit axial back mixing to a certain extent, making the contact and mass transfer of the two phases in the tower more sufficient and stable, further improving the mass transfer efficiency. As the extraction proceeds, the phase with high density will sink under the action of gravity, while the phase with low density will float up. There is obvious stratification. As the stratification proceeds, the floating plate 921 with a high density in the lower layer floats up compared to the fixed plate 911. Since the fixed valve port 912 is a conical structure, the discharge port opening formed between the fixed valve port 912 and the floating valve plate 922 in the high-density layer area is reduced. By reducing the discharge port opening, the flow rate of the liquid in this area is slowed down, which makes the light phase and the heavy phase have more time to contact each other on the tower plate, thereby increasing the chance of solute transfer from one phase to another. At the same time, reducing the opening can reduce the situation where one phase is entrained by another phase. If the tower plate opening is large and the flow rate is fast, one phase may be entrained too much by the other phase, resulting in a decrease in mass transfer effect. Using a smaller opening in the high-density layer area can reduce this entrainment phenomenon, making the flow of the two phases in the tower more independent and orderly.

[0025] When the liquid forms larger droplets or aggregates on the fixed valve port 912 due to the interfacial tension, the smooth flow of the liquid is hindered. Since the liquid and air cannot flow out, the space below the tower plate is gradually occupied, and bubbles will gather under the tower plate. As the bubbles continue to form and burst, they will continuously impact the floating plate 921, causing the top rod 925 to press the sealing steel ball 934 downward. When the sealing steel ball 934 is pressed downward until the spring of the spring seat 935 is deformed downward, the gas originally stored in the pressure chamber 932 escapes, and then impacts the fixed valve port 912 and passes through the floating plate 921. 1 drives the entire floating valve disc 92 to rise together. When the floating valve disc 92 rises, the floating valve plate 922 will exceed the top of the fixed valve port 912. In this upward movement process, the blocked state of the liquid can be gradually broken, and the accumulated liquid can start to flow again, ensuring that the mass transfer process can be carried out continuously and stably, ensuring that the equipment can operate stably for a long time, reducing the number and time of shutdown maintenance, and improving production efficiency. At the same time, if the impurities precipitated during the extraction of 5-nitrofurfural diethyl ester at the heavy phase outlet agglomerate and block the floating valve plate 922, the impurity agglomerates can also be removed by the rising floating disc 921.

[0026] When back mixing occurs in the extraction tower 1, the back mixing causes the unstable flow of the fluid in the extraction tower 1, and the turbulence and vortex generated by the back mixing will continuously impact the floating plate 921, causing the floating plate 921 to continuously float up and down inside the fixed plate body 911. During the floating up and down process of the floating plate 921, the connecting curved rod 923 will drive the top piston plate 924 to rise and fall in the pitch-adjusting curved tube 942. Since the floating process of the floating plate 921 caused by the back mixing is rapidly changing, at this time, the liquid stored in the pitch-adjusting curved tube 942 cannot be completely discharged through the capillary 945 (according to the flow formula Q=Av, where Q is the flow rate, A is the cross-sectional area of ​​the pipe, and v is the liquid flow rate, the flow rate of the pipe is proportional to the cross-sectional area of ​​the pipe, and the cross-sectional area of ​​the thin pipe is small, which means that the volume of liquid that can pass through per unit time is relatively small. At the same time, for the thin pipe, the viscosity has a greater hindering effect on the flow of the liquid. The liquid pushed upward will squeeze the piston plate at the bottom of the spring adjusting member 943, causing the piston plate to move upward. When the piston plate moves upward, the liquid originally stored in the upper section of the pitch-adjusting curved tube 942 will be pushed into the interior of the tube sleeve 941. As the volume of the liquid inside the tube sleeve 941 increases, the pushing pistons 946 on the upper and lower sides of the tube sleeve 941 begin to push outward, thereby pushing the liquid stored in the liquid storage tube 8, so that the rotating tower plates 9 on the upper and lower sides of the back-mixing area are away from the tower plates where the back-mixing area occurs. By increasing the spacing between the rotating tower plates 9, a larger mass transfer space is provided, so that the liquid has more space to diffuse during the falling or rising process, reducing local liquid accumulation and uneven flow, improving mass transfer efficiency, reducing back-mixing caused by insufficient mass transfer, and at the same time stabilizing the interface between the gas-liquid two phases, reducing local mixing and back-mixing caused by interface fluctuations.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A nifuratel raw material extraction device, comprising an extraction tower (1), a light phase outlet (2) arranged at the top of the extraction tower (1), a heavy phase inlet (3) arranged at the upper left side of the extraction tower (1), a light phase inlet (6) arranged at the lower left side of the extraction tower (1), and a heavy phase outlet (5) arranged at the bottom of the extraction tower (1), characterized in that: The top of the extraction tower (1) is provided with a turntable drive (7), on which a plurality of rotating tower plates (9) arranged in a linear array are installed, the inner side wall of the extraction tower (1) is fixedly connected with a plurality of fixed rings (4), and a plurality of the rotating tower plates (9) are arranged between every two adjacent fixed rings (4), the rotating tower plates (9) include a fixed turntable (91), the fixed turntable (91) includes a fixed disk body (911), the upper side of the fixed disk body (911) is fixedly connected with a plurality of fixed valve ports (912) arranged in a circumferential array, the inner side wall of the fixed valve port (912) is slidably connected with a floating valve disk (92) at an upper limit position, the floating valve disk (92) includes a floating disk (921), and a plurality of floating valve plates (922) arranged in a circumferential array are installed on the floating disk (921), and the plurality of floating valve plates (922) are respectively arranged directly below the plurality of fixed valve ports (912); A pressure storage plate (93) is fixedly connected to the bottom of the floating plate (921), and the pressure storage plate (93) includes a pressure storage plate (931). A pressure chamber (932) is provided inside the pressure storage plate (931), and a plurality of exhaust holes are provided on the top of the pressure storage plate (931). Sealing steel balls (934) are provided in the exhaust holes provided on the tops of the pressure storage plates (931), and a plurality of spring seats (935) are fixedly connected to the top of the pressure storage plate (931). The plurality of spring seats (935) are respectively disposed on the outsides of the plurality of sealing steel balls (934), and the plurality of sealing steel balls (934) are respectively fixedly connected to the plurality of sealing steel balls (934) via springs.

2. A nifuratel raw material extraction device according to claim 1, characterized in that: A plurality of push rods (925) arranged in a circular array are fixedly connected to the lower side wall of the floating plate (921), and the plurality of push rods (925) are respectively arranged directly above a plurality of sealing steel balls (934).

3. A nifuratel raw material extraction device according to claim 1, characterized in that: A pressure injection valve (933) is installed on the outer side wall of the pressure storage plate (931).

4. A nifuratel raw material extraction device according to claim 1, characterized in that: The turntable drive (7) comprises a turntable drive motor (71), a movable shaft of the turntable drive motor (71) is connected to a reversing reducer (72), and a driving shaft (73) is connected to a longitudinal output end of the reversing reducer (72).

5. A nifuratel raw material extraction device according to claim 4, characterized in that: The plurality of light phase outlets (2) are all connected to the driving shaft (73) in a limited sliding manner, and a connecting plate (913) is fixedly connected just above the fixed plate body (911), and a distance regulating tube core (94) is fixedly connected to the inner wall of the connecting plate (913), and the distance regulating tube core (94) includes a tube sleeve (941). The outer wall of the driving shaft (73) is fixedly connected to a plurality of liquid storage tubes (8), and the tops and bottoms of the plurality of liquid storage tubes (8) located in the middle are respectively sleeved on the outer walls of two adjacent tube sleeves (941), and the two liquid storage tubes (8) located at the top and the bottom are respectively sleeved on the outer walls of the tube sleeve (941) located at the top and the tube sleeve (941) located at the bottom, and through holes for draining liquid are provided on the end surfaces of the two liquid storage tubes (8) located at the top and the bottom.

6. A nifuratel raw material extraction device according to claim 5, characterized in that: A plurality of connecting bent rods (923) are fixedly connected to the inner side wall of the floating plate (921), and the other end of each connecting bent rod (923) is fixedly connected to a push piston plate (924).

7. A nifuratel raw material extraction device according to claim 6, characterized in that: A pitch-adjusting curved tube (942) is fixedly connected to the outer wall of the tube sleeve (941), and a spring adjusting member (943) is fixedly connected inside the pitch-adjusting curved tube (942). A capillary tube (945) and a one-way valve (944) are respectively connected to the middle position of the outer side of the tube wall of the pitch-adjusting curved tube (942), and a push piston (946) is slidably connected to the top and bottom of the tube sleeve (941), and a return spring (947) is fixedly connected between the two push pistons (946).

8. A nifuratel raw material extraction device according to claim 7, characterized in that: The spring adjusting member (943) is composed of a plate body fixed inside the pitch adjusting curved tube (942), a spring fixed below the plate body, and a piston plate connected to the bottom of the spring and connected to the inner wall of the pitch adjusting curved tube (942) in a limited sliding manner.

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