An extraction device for nifuratel raw materials

Abstract

The present invention provides a device for extracting nifuratel raw materials, which relates to the technical field of raw material extraction. The nifuratel raw material extraction device includes an extraction tower, a light phase outlet arranged at the top of the extraction tower, a heavy phase inlet arranged above the left side of the extraction tower, a light phase inlet arranged below the left side of the extraction tower, and a heavy phase outlet arranged at the bottom of the extraction tower. A turntable is installed at the top of the extraction tower to drive rotation, and a plurality of rotating trays arranged in a linear array are installed on the turntable driving rotation. A plurality of fixing rings are fixedly connected to the inner side wall of the extraction tower, and the plurality of rotating trays are arranged between every two adjacent fixing rings. The present invention solves the problems of backmixing and uneven liquid distribution during the extraction of the intermediate raw material of nifuratel - 5 - nitrofurfural diethyl ester, which greatly reduces the mass transfer efficiency. At the same time, floating trays floating in different layer areas are used to adapt to the mass transfer conditions in different layer areas to improve the mass transfer efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of raw material extraction, and specifically to an extraction device for nifuratel raw materials. Background Art

[0002] Nifuratel is an important antibacterial drug, which has strong killing effects on various pathogens such as Gram-positive and negative bacteria, trichomonas, mold, chlamydia, and mycoplasma. Clinically, it is widely used to treat vaginal infections and other diseases caused by bacteria, trichomonas, and Candida albicans. 5-Nitrofuraldehyde diethyl ester is one of the key starting raw materials for the synthesis of nifuratel. In drug synthesis, as a key intermediate, 5-nitrofuraldehyde diethyl ester can be synthesized into nifuratel through a series of reactions. During the preparation process, hydrolysis reaction is often used to convert it into 5-nitrofuraldehyde. For example, hydrolysis with dilute acid in organic alcohol has problems such as many side reactions and impurities, resulting in low yield and purity. In order to improve its yield and purity, improved methods have emerged continuously. At the same time, in the related production process, the extraction operation of 5-nitrofuraldehyde diethyl ester is often involved to achieve more efficient separation and purification, and to provide higher-quality raw materials for the synthesis of nifuratel.

[0003] However, when extracting 5-nitrofuraldehyde diethyl ester, it involves the interaction of substances in different phases. Due to the differences in the properties of substances and the changes in operating conditions, the interfacial tension will have an adverse impact on the distribution of liquid on the tray. The difference in interfacial tension between different substances makes it difficult for the liquid to spread and flow evenly on the tray, causing 5-nitrofuraldehyde diethyl ester to possibly form larger droplets or agglomerate into clusters, hindering the smooth flow of the liquid, resulting in liquid accumulation or dryness in local areas, destroying the phase equilibrium state, and reducing the mass transfer efficiency. Secondly, the solubility difference of 5-nitrofuraldehyde diethyl ester and the changes in operating conditions inside the extraction tower will affect the flow state of the liquid inside the tower, thereby leading to the mixing phenomenon (hereinafter referred to as backmixing) between materials with different residence times. Backmixing will cause the mass transfer efficiency of 5-nitrofuraldehyde to decrease, mix materials with different residence times, destroy the orderly contact, affect the transfer speed of solute between the two phases, and reduce the extraction efficiency. On the other hand, it will destroy the phase equilibrium, change the concentration and pressure distribution inside the tower, and make the separation effect worse. Based on the above viewpoints, the present invention provides an extraction device for nifuratel raw materials. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides an extraction device for nifuratel raw materials, which solves the problems of backmixing and uneven liquid distribution during the extraction of the intermediate raw material of nifuratel - 5-nitrofuraldehyde diethyl ester, resulting in a significant reduction in mass transfer efficiency. At the same time, it uses floating trays floating in different layer areas to adapt to the mass transfer conditions in different layer areas to improve the mass transfer efficiency.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: A device for extracting nifuratel raw materials, comprising an extraction tower, a light-phase outlet arranged at the top of the extraction tower, a heavy-phase inlet arranged above the left side of the extraction tower, a light-phase inlet arranged below the left side of the extraction tower, and a heavy-phase outlet arranged at the bottom of the extraction tower. A turntable drive is installed at the top of the extraction tower to drive rotation. A number of rotating trays arranged in a linear array are installed on the turntable drive rotation. A number of fixed rings are fixedly connected to the inner side wall of the extraction tower. A number of the rotating trays are arranged between every two adjacent fixed rings. The rotating tray includes a fixed turntable. The fixed turntable includes a fixed disk body. A number of fixed valve openings arranged in a circumferential array are fixedly connected above the fixed disk body. A floating valve disk is limited and slidably connected to the inner side wall of the fixed valve opening. The floating valve disk includes a floating disk. A number of floating valve plates arranged in a circumferential array are installed on the floating disk. A number of the floating valve plates are respectively arranged directly below a number of the fixed valve openings;

[0006] The bottom of the floating disk is fixedly connected with a pressure storage disk. The pressure storage disk includes a pressure storage disk body. A pressure chamber is opened inside the pressure storage disk body. A number of exhaust holes are opened at the top of the pressure storage disk. Sealing steel balls are arranged in a number of the exhaust holes opened at the top of the pressure storage disk. A number of spring seats are fixedly connected to the top of the pressure storage disk. A number of the spring seats are respectively placed outside a number of the sealing steel balls. A number of the sealing steel balls are fixedly connected to a number of the spring seats through springs respectively.

[0007] Preferably, a number of top rods arranged in a circumferential array are fixedly connected to the lower side wall of the floating disk. A number of the top rods are respectively arranged directly above a number of the sealing steel balls.

[0008] Preferably, an injection valve is installed on the outer side wall of the pressure storage disk body.

[0009] Preferably, the turntable drive rotation includes a turntable drive motor. A reversing speed reducer is connected to the moving shaft of the turntable drive motor. A drive shaft rod is connected to the longitudinal output end of the reversing speed reducer.

[0010] Preferably, a number of the light-phase outlets are all limited and slidably connected to the drive shaft rod. A connection disk is fixedly connected directly above the fixed disk body. An adjustable distance pipe core is fixedly connected to the inner side wall of the connection disk. The adjustable distance pipe core includes a pipe sleeve. A number of liquid storage pipes are fixedly connected to the outer side wall of the drive shaft rod. The tops and bottoms of a number of the liquid storage pipes located in the middle position are respectively sleeved on the outer side walls of two adjacent pipe sleeves. The two liquid storage pipes located at the top and bottom are respectively sleeved on the outer side walls of the pipe sleeve located at the top and the pipe sleeve located at the bottom. Through holes for draining liquid are opened on the end faces of the two liquid storage pipes located at the top and bottom.

[0011] Preferably, a number of connecting curved rods are fixedly connected to the inner side wall of the floating disc, and the other end of each connecting curved rod is fixedly connected to a pushing piston disc.

[0012] Preferably, an adjustable curved pipe is fixedly connected to the outer side wall of the pipe sleeve, and a spring adjusting member is fixedly connected inside the adjustable curved pipe. A capillary tube and a check valve are respectively connected to the middle position on the outer wall of the pipe wall of the adjustable curved pipe. A pushing piston is connected to the top and bottom of the pipe sleeve in a limited sliding manner, and a return spring is fixedly connected between the two pushing pistons.

[0013] Preferably, the spring adjusting member is composed of a plate body fixed inside the adjustable curved pipe, a spring fixed below the plate body, and a piston plate connected to the bottom of the spring and limitedly slidingly connected to the inner wall of the adjustable curved pipe.

[0014] The present invention has the following technical points and beneficial effects:

[0015] 1. During the extraction process, as the extraction progresses, the phase with a larger density sinks and the phase with a smaller density floats, resulting in obvious stratification in the extraction tower. The floating disc with a larger density in the lower layer floats relative to the fixed disc body. Since the fixed valve port has a conical structure, the opening degree of the discharge port formed between the fixed valve port and the floating valve plate in the layer area with a larger density decreases. Reducing the opening degree of the discharge port can slow down the liquid flow rate, increase the contact time between the light phase and the heavy phase on the tray, increase the opportunity for solute transfer, and at the same time reduce the entrainment of one phase by the other phase. Using a smaller opening degree in the high-density layer area can reduce the entrainment phenomenon and make the flow of the two phases in the tower more independent and orderly.

[0016] 2. During the extraction process, large liquid droplets or clusters are formed at the fixed valve port due to the interfacial tension, hindering the smooth flow of the liquid, resulting in the inability of the liquid and air to flow out, and bubbles accumulating below the tray. The continuously formed and broken bubbles impact the floating disc, causing the ejector rod to press down the sealing steel ball. The downward pressure of the sealing steel ball deforms the spring of the spring seat, and the gas in the pressure chamber overflows to impact the fixed valve port and drive the floating valve disc to rise. When the floating valve disc rises, the floating valve plate exceeds the top of the fixed valve port, which can break the liquid blockage state, make the accumulated liquid flow again, ensure the continuous and stable progress of the mass transfer process, ensure the long-term stable operation of the equipment, reduce the number and time of shutdown and maintenance, and improve production efficiency.

[0017] 3. When backmixing occurs in the extraction column, the unstable fluid flow caused by backmixing and the resulting turbulence and vortices will continuously impact the floating tray, causing the floating tray to float up and down within the fixed tray body. During the floating process of the floating tray, the connecting curved rod drives the top piston plate to rise and fall within the distance-adjusting curved tube. Due to the rapid change in the floating of the floating tray, the liquid in the distance-adjusting curved tube cannot be completely discharged through the capillary tube. The liquid pushed upward squeezes the bottom piston plate of the spring adjusting member, causing it to move upward, and pushing the liquid in the upper section of the distance-adjusting curved tube into the sleeve. As the volume of the liquid inside the sleeve increases, the pushing piston pushes the liquid in the liquid storage tube outward, causing the rotating trays on both sides of the backmixing area to move away from the tray in the backmixing area. By increasing the distance between the rotating trays, a larger mass transfer space is provided, allowing more space for the liquid to diffuse during the falling or rising process, reducing local liquid accumulation and uneven flow, improving the mass transfer efficiency, reducing backmixing caused by insufficient mass transfer, and at the same time stabilizing the gas-liquid two-phase interface and reducing local mixing and backmixing caused by interface fluctuations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of the present invention;

[0019] Figure 2 is a sectional view of the present invention;

[0020] Figure 3 is a schematic connection diagram of the turntable drive rotation, the rotating tray and the liquid storage tube in the present invention;

[0021] Figure 4 is a schematic diagram of the rotating tray in the present invention;

[0022] Figure 5 is an exploded view of the rotating tray in the present invention;

[0023] Figure 6 is a top view of the rotating tray in the present invention;

[0024] Figure 7 is Figure 6 an isometric sectional view along A-A in

[0025] Figure 8 is Figure 7 an enlarged schematic view at B in

[0026] Figure 9 is a schematic connection diagram of adjacent rotating trays in the present invention;

[0027] Figure 10 is a sectional view of adjacent rotating trays in the present invention.

[0028] Among them, 1. Extraction column; 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 tray;

[0029] 71. Turntable drive motor; 72. Reversing speed reducer; 73. Drive shaft rod;

[0030] 91. Fixed turntable; 92. Floating valve plate; 93. Pressure accumulator plate; 94. Spacing adjustment pipe core;

[0031] 911. Fixed disk body; 912. Fixed valve port; 913. Connecting disk;

[0032] 921. Floating disk; 922. Floating valve plate; 923. Connecting curved rod; 924. Pushing piston disk; 925. Push rod;

[0033] 931. Pressure storage disk; 932. Pressure chamber; 933. Injection pressure valve; 934. Sealing steel ball; 935. Spring seat;

[0034] 941. Pipe sleeve; 942. Spacing adjustment curved pipe; 943. Spring adjustment part; 944. Check valve; 945. Capillary tube; 946. Pushing piston; 947. Return spring. Specific embodiments

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Example 1: As Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5As shown in the figure, an embodiment of the present invention provides an extraction device for nifuratel raw materials. An extraction device for nifuratel raw materials includes an extraction tower 1, a light-phase outlet 2 provided at the top of the extraction tower 1, a heavy-phase inlet 3 provided above the left side of the extraction tower 1, a light-phase inlet 6 provided below the left side of the extraction tower 1, and a heavy-phase outlet 5 provided at the bottom of the extraction tower 1. When extracting 5-nitrofuraldehyde diethyl ester, 5-nitrofuraldehyde diethyl ester is added as the heavy phase through the heavy-phase inlet 3 into the extraction tower 1, and the organic solvent is added as the light phase through the light-phase inlet 6 into the extraction tower 1. A turntable drive rotation 7 is installed at the top of the extraction tower 1, and a number of rotating trays 9 arranged in a linear array are installed on the turntable drive rotation 7. A number of fixed rings 4 are fixedly connected to the inner side wall of the extraction tower 1, and a number of rotating trays 9 are arranged between every two adjacent fixed rings 4. The rotating tray 9 includes a fixed turntable 91, and the fixed turntable 91 includes a fixed disk body 911. A number of fixed valve openings 912 arranged in a circumferential array are fixedly connected above the fixed disk body 911. A floating valve disk 92 is connected in a limit-sliding manner to the inner side wall of the fixed valve opening 912. The floating valve disk 92 includes a floating disk 921, and a number of floating valve plates 922 arranged in a circumferential array are installed on the floating disk 921. A number of floating valve plates 922 are respectively arranged directly below a number of fixed valve openings 912. As the extraction progresses, the phase with a higher density will sink under the action of gravity, while the phase with a lower density will float, and obvious stratification occurs in the extraction tower. As the stratification progresses, the floating disk 921 with a higher density in the lower layer floats relative to the fixed disk body 911. Since the fixed valve opening 912 has a conical structure, this causes the opening degree of the discharge port formed between the fixed valve opening 912 and the floating valve plate 922 in the area with a higher density layer to decrease. By reducing the opening degree of the discharge port, the flow rate of the liquid in this area is slowed down, which allows the light phase and the heavy phase to have more time to contact each other on the tray, thereby increasing the opportunity for the solute to transfer from one phase to another. At the same time, reducing the opening degree can reduce the entrainment of one phase by another phase. If the opening degree of the tray is large and the flow rate is fast, it may occur that one phase is excessively entrained by another phase, resulting in a decline in the mass transfer effect. Using a smaller opening degree 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.

[0037] As 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.

[0038] 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.

[0039] Embodiment 2: Figure 9 and Figure 10As shown, an adjustable bent pipe 942 is fixedly connected to the outer side wall of the pipe sleeve 941, and a spring adjusting member 943 is fixedly connected inside the adjustable bent pipe 942. A capillary 945 and a check valve 944 are respectively connected to the middle position on the outer side of the pipe wall of the adjustable bent pipe 942. A push piston 946 is connected to the top and bottom of the pipe sleeve 941 in a limited sliding manner, and a return spring 947 is fixedly connected between the two push pistons 946. The spring adjusting member 943 is composed of a plate fixed inside the adjustable bent pipe 942, a spring fixed below the plate, and a piston plate connected to the bottom of the spring and connected to the inner wall of the adjustable bent pipe 942 in a limited sliding manner. When backmixing occurs in the extraction tower 1, the unstable flow of the fluid in the extraction tower 1 caused by the backmixing and the turbulence and vortices generated by the backmixing will continuously impact the floating tray 921, causing the floating tray 921 to continuously float up and down inside the fixed disk body 911. During the up and down floating process of the floating tray 921, the jacking piston disk 924 will be driven by the connecting curved rod 923 to rise and fall in the adjustable bent pipe 942. Since the floating process of the floating tray 921 caused by the backmixing is rapidly changing, the liquid stored in the adjustable bent pipe 942 at this time cannot be completely discharged through the capillary 945, and the upwardly pushed liquid 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 adjustable bent pipe 942 will be pushed into the inside of the pipe sleeve 941.

[0040] As Figure 9 and Figure 10As shown in the figure, this embodiment provides another technical solution on the basis of Embodiment 1. A plurality of light-phase outlets 2 are all connected to the drive shaft 73 in a limited sliding manner. A connecting disk 913 is fixedly connected directly above the fixed disk body 911. A distance-adjusting tube core 94 is fixedly connected to the inner side wall of the connecting disk 913. The distance-adjusting tube core 94 includes a tube sleeve 941. A plurality of liquid storage tubes 8 are fixedly connected to the outer side wall of the drive shaft 73. The top and bottom of the liquid storage tubes 8 located in the middle position are respectively sleeved on the outer side walls of two adjacent tube sleeves 941. The two liquid storage tubes 8 located at the top and 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. Through holes for liquid drainage are provided on the end faces of the two liquid storage tubes 8 located at the top and bottom. A plurality of connecting curved rods 923 are fixedly connected to the inner side wall of the floating disk 921. The other end of each connecting curved rod 923 is fixedly connected to a pushing piston disk 924. 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 start to push outwards, thereby pushing the liquid stored in the liquid storage tube 8, so that the rotating trays 9 on the upper and lower sides of the backmixing area move away from the tray where the backmixing area appears. By increasing the distance between the rotating trays 9, a larger mass transfer space is given, so that the liquid has more space to diffuse during the falling or rising process, reducing local liquid accumulation and uneven flow, improving the mass transfer efficiency, reducing the backmixing caused by insufficient mass transfer, and at the same time stabilizing the phase interface between the gas and liquid phases, reducing the local mixing and backmixing caused by interface fluctuations. When the backmixing situation is stable, the floating disk 921 no longer floats up and down, and the return spring 947 pulls the two pushing pistons 946 back to their original positions, so that the distance between the rotating trays 9 returns to normal. At the same time, when the floating disk 921 floats normally, the liquid at the bottom of the spring adjusting member 943 is discharged through the capillary tube 945 and reflows into the distance-adjusting curved tube 942 through the spring adjusting member 943.

[0041] Working principle: When extracting 5-nitrofurfural diethyl ester, 5-nitrofurfural diethyl ester is added into the extraction tower 1 as the heavy phase through the heavy-phase inlet 3, and the organic solvent is introduced into the extraction tower 1 as the light phase through the light-phase inlet 6. Subsequently, the rotary disk drive motor 71 drives the drive shaft rod 73 to rotate rapidly through the reversing speed reducer 72. By using the shear stress generated by the rotation, the dispersed phase is broken into many small droplets, thereby increasing the actual contact area and mass transfer coefficient, strengthening the mass transfer process. The fixed rings 4 arranged at the upper and lower ends of the rotating tray 9 can, to a certain extent, inhibit axial backmixing, making the contact and mass transfer between the two phases in the tower more sufficient and stable, and further improving the mass transfer efficiency. As the extraction progresses, the phase with a larger density will sink under the action of gravity, while the phase with a smaller density will float, resulting in an obvious stratification in the extraction tower. As the stratification proceeds, the floating tray 921 with a larger density in the lower layer floats upward relative to the fixed tray body 911. Since the fixed valve orifice 912 has a conical structure, this causes the opening degree of the discharge port formed between the fixed valve orifice 912 and the floating valve plate 922 in the layer area with a larger density to decrease. By reducing the opening degree of the discharge port, the flow rate of the liquid in this area is slowed down, which allows the light phase and the heavy phase to have more time to contact each other on the tray, thereby increasing the opportunity for the solute to transfer from one phase to another. At the same time, reducing the opening degree can reduce the entrainment of one phase by the other phase. If the opening degree of the tray is large and the flow rate is fast, one phase may be excessively entrained by the other phase, resulting in a decline in the mass transfer effect. Using a smaller opening degree 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.

[0042] When the liquid forms larger droplets or aggregates due to the interfacial tension above the fixed valve orifice 912, hindering the smooth flow of the liquid. Since the liquid and air cannot flow out, the space below the tray is gradually occupied, and bubbles will form and accumulate below the tray. As the bubbles continuously form and break, they will continuously impact the floating tray 921, causing the ejector rod 925 to press the sealing steel ball 934 downward. When the sealing steel ball 934 is pressed downward until the spring in the spring seat 935 deforms downward, the gas originally stored in the pressure chamber 932 escapes, and then impacts the fixed valve orifice 912 and drives the entire floating valve disk 92 to rise together through the floating tray 921. When the floating valve disk 92 rises, the floating valve plate 922 will exceed the top of the fixed valve orifice 912. During 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 proceed continuously and stably, guaranteeing that the equipment can operate stably for a long time, reducing the number and time of shutdown for maintenance, and improving production efficiency. At the same time, if impurities precipitate and agglomerate to block the floating valve plate 922 during the extraction of 5-nitrofurfural diethyl ester at the heavy-phase outlet, the impurity agglomerates can also be removed by the rising floating tray 921.

[0043] When backmixing occurs in the extraction column 1, the unstable flow of the fluid in the extraction column 1 caused by backmixing, as well as the turbulence and vortices generated by backmixing, 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 up-and-down floating process of the floating plate 921, it will drive the jacking piston plate 924 to lift and lower in the distance-adjusting curved tube 942 through the connecting curved rod 923. Since the floating process of the floating plate 921 caused by backmixing is rapidly changing, the liquid stored in the distance-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 pipeline, and v is the liquid flow rate. The flow rate of the pipeline is proportional to the cross-sectional area of the pipeline. The cross-sectional area of the thin pipeline 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 pipeline, the hindering effect of viscous force on liquid flow is more obvious, making it difficult for the liquid to flow quickly). The upward-pushed liquid 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 distance-adjusting curved tube 942 will be pushed into the interior of the sleeve 941. As the volume of the liquid inside the sleeve 941 increases, the pushing pistons 946 on both the upper and lower sides of the sleeve 941 start to push outward, thereby pushing the liquid stored in the liquid storage tube 8, causing the rotating trays 9 on both the upper and lower sides of the backmixing area to move away from the trays in the area where backmixing occurs. By increasing the spacing between the rotating trays 9, a larger mass transfer space is provided, allowing the liquid to have more space to diffuse during the falling or rising process, reducing local liquid accumulation and uneven flow, improving the mass transfer efficiency, reducing backmixing caused by insufficient mass transfer, and at the same time stabilizing the phase interface between the gas and liquid phases, reducing local mixing and backmixing caused by interface fluctuations.

[0044] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An extraction device for nifuratel raw materials, 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 above the left side of the extraction tower (1), a light-phase inlet (6) arranged below the 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, A rotary disk drive for rotation (7) is installed at the top of the extraction tower (1). A number of rotating trays (9) distributed in a linear array are installed on the rotary disk drive for rotation (7). A number of fixed rings (4) are fixedly connected to the inner side wall of the extraction tower (1). The number of rotating trays (9) is arranged between every two adjacent fixed rings (4). The rotating tray (9) includes a fixed rotary disk (91). The fixed rotary disk (91) includes a fixed disk body (911). A number of fixed valve openings (912) distributed in a circumferential array are fixedly connected above the fixed disk body (911). A floating valve disk (92) is connected in a limited sliding manner to the inner side wall of the fixed valve opening (912). The floating valve disk (92) includes a floating disk (921). A number of floating valve plates (922) distributed in a circumferential array are installed on the floating disk (921). The number of floating valve plates (922) is respectively arranged directly below the number of fixed valve openings (912). A pressure accumulating disk (93) is fixedly connected to the bottom of the floating disk (921). The pressure accumulating disk (93) includes a pressure storage disk (931). A pressure chamber (932) is opened inside the pressure storage disk (931). A number of exhaust holes are opened at the top of the pressure storage disk (931). Sealing steel balls (934) are arranged in the exhaust holes opened at the top of the number of pressure storage disks (931). A number of spring seats (935) are fixedly connected to the top of the pressure storage disk (931). The number of spring seats (935) is respectively placed outside the number of sealing steel balls (934). The number of sealing steel balls (934) is fixedly connected to the number of sealing steel balls (934) through springs respectively.

2. The extraction device for nifuratel raw materials according to claim 1, characterized in that, A number of ejector rods (925) distributed in a circumferential array are fixedly connected to the lower side wall of the floating disk (921). The number of ejector rods (925) is respectively arranged directly above the number of sealing steel balls (934).

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

4. A nitrofurazone raw material extraction device according to claim 1, characterized in that, The rotary disk drive for rotation (7) includes a rotary disk drive motor (71). A reversing speed reducer (72) is connected to the moving shaft of the rotary disk drive motor (71). A drive shaft rod (73) is connected to the longitudinal output end of the reversing speed reducer (72).

5. The extraction device for nifuratel raw materials according to claim 4, characterized in that, The number of light phase outlets (2) are all connected in a limited sliding manner to the drive shaft rod (73). An adapter plate (913) is fixedly connected directly above the fixed disk body (911). An adjustable distance pipe core (94) is fixedly connected to the inner side wall of the adapter plate (913). The adjustable distance pipe core (94) includes a pipe sleeve (941). A number of liquid storage pipes (8) are fixedly connected to the outer side wall of the drive shaft rod (73). The top and bottom of the number of liquid storage pipes (8) located in the middle position are respectively sleeved on the outer side walls of two adjacent pipe sleeves (941). The two liquid storage pipes (8) located at the top and bottom are respectively sleeved on the outer side wall of the pipe sleeve (941) located at the top and the outer side wall of the pipe sleeve (941) located at the bottom. Through holes for draining liquid are opened on the end faces of the two liquid storage pipes (8) located at the top and bottom.

6. The extraction device for nifuratel raw materials according to claim 5, wherein, A number of connecting curved rods (923) are fixedly connected to the inner side wall of the floating disc (921), and the other end of each connecting curved rod (923) is fixedly connected to a pushing piston disc (924).

7. A nitrofurazone raw material extraction device according to claim 6, characterized in that, An adjustable distance curved pipe (942) is fixedly connected to the outer side wall of the pipe sleeve (941), and a spring adjusting member (943) is fixedly connected inside the adjustable distance curved pipe (942). A capillary tube (945) and a one-way valve (944) are respectively connected to the middle position on the outer side of the pipe wall of the adjustable distance curved pipe (942). A pushing piston (946) is connected to the top and bottom of the pipe sleeve (941) in a limited sliding manner, and a return spring (947) is fixedly connected between the two pushing pistons (946).

8. A nitrofural 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 adjustable distance curved pipe (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 adjustable distance curved pipe (942) in a limited sliding manner.

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