Production equipment and preparation method of furanone

Abstract

The furanone production equipment comprises a drying box and a cover plate, V-shaped sliding grooves are formed in an inner cavity of the drying box, two sliding shafts are symmetrically provided with fixing strips, a drying plate is installed between the two fixing strips, drying holes are formed in the bottom of the drying plate, and horizontal linear sliding grooves are symmetrically formed in the drying box. Horizontal linear sliding grooves are formed in the drying box, first sliding blocks are connected to the horizontal linear sliding grooves in a sliding mode, a connecting shaft is installed between the two first sliding blocks, a cleaning assembly used for cleaning the drying holes is installed at the top of the connecting shaft, and a reciprocating driving mechanism is installed at the bottom of the drying box. The furanone drying device has the advantages that furanone in the drying plate can shake under the action of the V-shaped sliding grooves, the drying plate can synchronously slide up and down under the limiting action of the V-shaped sliding grooves, furanone in the drying plate jumps up and down, furanone is fully dried in cooperation with the drying device in the drying box, and the drying efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of asphalt extraction, in particular to a production device and a preparation method of furanone. Background Art

[0002] After the preparation of furanone is completed, the furanone needs to be dried to evaporate the residual liquid in the finished furanone, so as to facilitate the storage of the furanone. However, the existing drying equipment generally pours the dry raw materials into a receiving tray and then puts them into a drying room for drying. This drying method easily causes uneven drying, and the furanone in some positions cannot be fully dried. In addition, the accumulation of materials during drying will also affect the drying efficiency. Therefore, the present invention develops a furanone production equipment and a preparation method to solve the above technical problems. Summary of the invention

[0003] The object of the present invention is to provide a production device and a preparation method of furanone to solve the technical problems raised by the above background technology.

[0004] To achieve the above object, the first technical solution provided by the present invention is: A furanone production device comprises a drying box, wherein a cover plate which can be lifted and opened is arranged on the top of the drying box, and a telescopic exhaust pipe is connected to the top of the cover plate, V-shaped slide grooves are symmetrically provided on the two opposite side walls of the inner cavity of the drying box, and a horizontal section is provided at the bottom of the V-shaped slide groove, two V-shaped slide grooves are symmetrically slidably connected with sliding shafts, and fixing bars are symmetrically installed at the ends of the two sliding shafts close to each other, and a drying plate with a bottom concave inwardly is installed between the two fixing bars, and the drying plate is located above the V-shaped slide groove, and a plurality of drying holes are provided at the bottom of the drying plate, and horizontal linear slide grooves are symmetrically provided on the two opposite side walls of the drying box, and the horizontal linear slide grooves are located at Between the V-shaped slide and the drying plate, the horizontal linear slide is slidably connected with a first slider, a connecting shaft is installed between the ends of the two first sliders close to each other, and the connecting shaft passes through two fixed bars and is slidably connected with the fixed bars, a cleaning component for cleaning the drying hole is installed on the top of the connecting shaft, and when the sliding shaft slides to the horizontal section of the V-shaped slide, the top of the cleaning component passes through the drying hole, and when the sliding shaft slides to the inclined sections on both sides of the V-shaped slide, the cleaning component is separated from the drying hole, and a reciprocating drive mechanism is installed at the bottom of the drying box, and the reciprocating drive mechanism is connected to the cleaning component and drives the cleaning component and the connecting shaft to slide back and forth along the horizontal linear slide.

[0005] Preferably, the cleaning assembly includes a plurality of fixed rods connected to the connecting shaft, the top of the fixed rods is fixed with cleaning needles corresponding to the drying holes, connecting rods are symmetrically installed at both ends of the bottom between the plurality of fixed rods, and the connecting rods are connected to the reciprocating drive mechanism.

[0006] Preferably, the drying holes are arranged in a rectangular array, the connecting shaft is a reciprocating screw, the connecting rod is slidably connected to the reciprocating drive mechanism, the outer wall of the connecting shaft is threadedly connected with a threaded sleeve, the fixing rod is fixedly connected to the threaded sleeve, and horizontally arranged racks are symmetrically fixed to the opposite side walls of the inner cavity of the drying box, and the rack is located above one end of the horizontal linear slide groove, and the outer wall of the connecting shaft is equipped with a rotating gear meshing with the rack through a one-way bearing.

[0007] Preferably, a limiting groove is formed through the fixing bar, a second slider is slidably connected between inner walls of the limiting groove, and a connecting shaft is rotatably connected to the second slider.

[0008] Preferably, the reciprocating drive mechanism includes a driving motor installed at the bottom of the drying box and a sliding rod slidably connected to two connecting rods respectively, the output end of the driving motor passes through the bottom of the drying box and is installed with a turntable, a pin is installed on the top of the turntable, and a sliding bar that cooperates with the pin is installed between the ends of the two sliding rods that are close to each other, and the sliding bar is provided with a strip groove that cooperates with the pin.

[0009] Preferably, an exhaust fan is fixedly connected to the outer wall of the output end of the driving motor, and the exhaust fan is located below the turntable. A disc heating tube is installed between the side walls of the inner cavity of the drying box, and the disc heating tube is located between the exhaust fan and the turntable.

[0010] Preferably, the fixing strips are detachably connected to the drying plates, and receiving plates are symmetrically fixed to the sides of the two fixing strips close to each other, and the drying plates are placed across the two receiving plates. The tops of the fixing strips are recessed inwards to form plug-in slots, and elastic positioning pins are slidably installed through the plug-in slots along the height direction on the sides of the plug-in slots close to the drying plates. Positioning holes that cooperate with the elastic positioning pins are formed on the side walls of the drying plates, and an extrusion strip for pushing out the elastic positioning pins and inserting them into the positioning holes is inserted into the plug-in slots, and the tops of the extrusion strips pass through the plug-in slots.

[0011] Preferably, the elastic positioning pin includes a positioning pin, a positioning block is installed at one end of the positioning pin located inside the plug-in slot, a spring is sleeved on the outer wall of the positioning pin, and the spring is located between the positioning block and the inner wall of the plug-in slot, and the side of the positioning block and the bottom of the extrusion strip close to each other is provided with mutually matching inclined surfaces.

[0012] Preferably, the side wall of the drying plate is provided with a positioning groove which cooperates with the fixing strip.

[0013] The second technical solution provided by the present invention is: A method for preparing furanone comprises the following steps: S1, preparing a hexanedione solution: adding a certain amount of acetone aldehyde and acetic acid to a reaction kettle in sequence and stirring and mixing, adding a certain amount of zinc powder to a reaction bottle after the mixing is completed, and stirring and dissolving while adding, while maintaining the temperature of the reaction bottle in the range of 25 to 40° C. during the adding process, after the addition and dissolution are completed, obtaining an intermediate product hexanedione solution; S2, purification of hexanedione: adding sodium sulfate to the hexanedione solution prepared in step S1, and centrifuging, adding ethyl acetate extractant to the separated liquid phase for extraction, extracting in an extraction device to obtain an extraction solution, then introducing the extraction solution into an evaporation concentration device for oil phase evaporation concentration, recovering ethyl acetate and distilled water, and obtaining an extraction concentrate; freezing and crystallizing the concentrate, and centrifuging to obtain a hexanedione mother liquor and purified hexanedione; S3, preparation of furanone semi-finished product: adding purified hexanedione to sodium dihydrogen phosphate solution, stirring and mixing to dissolve, adding acetic acid to adjust the pH value of the solution, and then after the cyclization reaction is complete, standing and cooling at room temperature for a period of time, separating the oil phase and the water phase; and concentrating the oil phase through an evaporation concentration device to recover butyl acetate, to obtain a liquid phase furanone semi-finished product; S4. Preparation of finished furanone: freeze-crystallize the liquid furanone semi-finished product and centrifuge to obtain crude furanone, and then purify and dry the crude furanone to obtain the finished furanone. The production equipment in the first solution is used for drying.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. When the furanone is dried, the reciprocating driving mechanism can drive the drying plate to slide back and forth, so that the furanone in the drying plate is shaken. At the same time, the drying plate can also slide up and down synchronously under the limiting effect of the V-shaped slide groove, so that the furanone in the drying plate jumps up and down, and then cooperates with the drying device in the drying box to fully dry the furanone, thereby improving the drying efficiency.

[0015] 2. When the drying plate moves along the inclined section of the V-shaped chute to the horizontal section, its height gradually decreases, so that the cleaning component can be gradually inserted into the drying hole to push out the material blocked in the drying hole. The drying holes of the drying plate are cleaned intermittently in this way to avoid clogging of the drying holes and affecting the drying efficiency and drying effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the production equipment of the present invention; Figure 2 It is a schematic diagram of the front cross-section structure of the production equipment of the present invention; Figure 3 It is a schematic diagram of the front cross-section structure of a drying box in the production equipment of the present invention; Figure 4 It is a schematic diagram of the structure of the drying plate and its connecting parts in the production equipment of the present invention; Figure 5 It is a schematic diagram of the side cross-section structure of the drying plate and its connecting parts in the production equipment of the present invention; Figure 6 for Figure 5 A schematic diagram of the structure enlargement at the center A; Figure 7 It is a schematic diagram of the structure of the cleaning component in the production equipment of the present invention from a first angle; Figure 8 It is a second angle structural schematic diagram of the cleaning component in the production equipment of the present invention; Fig. 9 It is a structural schematic diagram of a driving mechanism in the production equipment of the present invention; Fig.10 It is a schematic diagram of the exploded structure of the drying box and the fixing strip in the production equipment of the present invention; Fig.11 It is a cross-sectional view of the structure between the elastic positioning pin and the fixing strip in the production equipment of the present invention.

[0018] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Drying box; 2. Cover plate; 3. Exhaust pipe; 4. V-shaped slide; 5. Sliding shaft; 6. Fixing bar; 61. Limiting groove; 62. Second slide block; 63. Attachment plate; 64. Insertion groove; 65. Elastic positioning pin; 651. Positioning pin; 652. Positioning block; 653. Spring; 66. Extrusion strip; 7. Drying plate; 71. Positioning hole; 72. Positioning groove; 8. Drying hole; 9. Horizontal linear slide; 10 , first slider; 11, connecting shaft; 111, threaded sleeve; 112, rotating gear; 12, cleaning assembly; 121, fixing rod; 122, cleaning needle; 123, connecting rod; 13, reciprocating drive mechanism; 131, driving motor; 132, sliding rod; 133, turntable; 134, pin shaft; 135, sliding bar; 136, strip groove; 137, exhaust fan; 14, rack; 15, disc heating tube. DETAILED DESCRIPTION

[0019] 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.

[0020] like Figure 1-11 As shown: Embodiment 1 of the present invention is: A furanone production device comprises a drying box 1, wherein a cover plate 2 which can be lifted and opened is arranged on the top of the drying box 1, and a telescopic exhaust pipe 3 is connected to the top of the cover plate 2, V-shaped chutes 4 are symmetrically provided on opposite side walls of the inner cavity of the drying box 1, and a horizontal section is provided at the bottom of the V-shaped chutes 4, two V-shaped chutes 4 are symmetrically slidably connected with sliding shafts 5, and fixing bars 6 are symmetrically installed at the ends of the two sliding shafts 5 close to each other, a drying plate 7 with a bottom recessed inwardly is installed between the two fixing bars 6, and the drying plate 7 is located above the V-shaped chutes 4, and a plurality of drying holes 8 are provided at the bottom of the drying plate 7, and horizontal linear chutes 9 are symmetrically provided on opposite side walls of the drying box 1, and the horizontal linear chutes 9 are located between the V-shaped chutes 4 and the drying plate 7. The horizontal linear slide 9 is slidably connected with a first slider 10, a connecting shaft 11 is installed between the ends of the two first sliders 10 that are close to each other, and the connecting shaft 11 passes through the two fixed bars 6 and is slidably connected with the fixed bars 6, a cleaning component 12 for cleaning the drying hole 8 is installed on the top of the connecting shaft 11, and when the sliding shaft 5 slides to the horizontal section of the V-shaped slide 4, the top of the cleaning component 12 passes through the drying hole 8, and when the sliding shaft 5 slides to the inclined sections on both sides of the V-shaped slide 4, the cleaning component 12 is separated from the drying hole 8, and a reciprocating drive mechanism 13 is installed at the bottom of the drying box 1, and the reciprocating drive mechanism 13 is connected to the cleaning component 12 and drives the cleaning component 12 and the connecting shaft 11 to slide back and forth along the horizontal linear slide 9.

[0021] The cleaning assembly 12 in this embodiment includes a plurality of fixed rods 121 connected to the connecting shaft 11, and a cleaning needle 122 corresponding to the drying hole 8 is fixedly connected to the top of the fixed rod 121, and connecting rods 123 are symmetrically installed at both ends of the bottom between the plurality of fixed rods 121, and the connecting rods 123 are connected to the reciprocating drive mechanism 13.

[0022] In this embodiment, in order to avoid the difficulty of cleaning the inside of the equipment due to too many cleaning needles, the drying holes 8 are arranged in a rectangular array, the connecting shaft 11 is a reciprocating screw, the connecting rod 123 is slidably connected to the reciprocating drive mechanism 13, the outer wall of the connecting shaft 11 is threadedly connected with a threaded sleeve 111, the fixing rod 121 is fixedly connected to the threaded sleeve 111, the opposite side walls of the inner cavity of the drying box 1 are symmetrically fixed with horizontally arranged racks 14, and the racks 14 are located above one end of the horizontal linear slide 9, and the outer wall of the connecting shaft 11 is installed with a rotating gear 112 meshing with the rack 14 through a one-way bearing, wherein the reciprocating drive mechanism drives When the connecting shaft slides back and forth, when the rotating gear and the rack are positively meshed, the rack can drive the rotating gear and the connecting shaft to rotate, thereby causing the threaded sleeve, the fixed rod, and the cleaning needle to slide, so that the cleaning needle can clean the next row of drying holes, and the drying holes in the rectangular array are cleaned row by row in this reciprocating manner. In this embodiment, the number of fixed rods can be half of the 8 rows of drying holes arranged in a rectangular array and are arranged at intervals. For example, if 8 rows of drying holes are arranged, 4 fixed rods are arranged at intervals of one row of drying holes, so that when the rack drives the rotating gear to rotate once, it drives the fixed rod to slide to the position of the next row of drying holes.

[0023] In this embodiment, in order to enable the fixing bar and the connecting shaft to both rotate and slide relative to each other, a limiting groove 61 is provided through the fixing bar 6, and a second slider 62 is slidably connected between the inner walls of the limiting groove 61, and the connecting shaft 11 is rotatably connected to the second slider 62, wherein the second slider can slide up and down along the limiting groove, and the connecting shaft and the second slider are rotatably connected via a rotating bearing.

[0024] In this embodiment, in order to enable the drying plate to slide back and forth, the reciprocating drive mechanism 13 includes a driving motor 131 installed at the bottom of the drying box 1 and sliding rods 132 slidably connected to the two connecting rods 123 respectively. The output end of the driving motor 131 passes through the bottom of the drying box 1 and is installed with a turntable 133. A pin 134 is installed on the top of the turntable 133. A sliding bar 135 that cooperates with the pin 134 is installed between the ends of the two sliding rods 132 that are close to each other. The sliding bar 135 is provided with a strip groove 136 that cooperates with the pin 134. The rotation of the driving motor can drive the turntable and the pin to rotate, thereby driving the sliding bar and the sliding rod to slide back and forth through the pin, and then driving the drying plate to slide back and forth through the sliding rod.

[0025] In this embodiment, in order to make full use of the driving force of the driving motor, an exhaust fan 137 is fixedly connected to the outer wall of the output end of the driving motor 131, and the exhaust fan 137 is located below the turntable 133. A disc heating tube 15 is installed between the side walls of the inner cavity of the drying box 1, and the disc heating tube 15 is located between the exhaust fan 137 and the turntable 133. The rotation of the driving motor can also drive the exhaust fan to rotate and exhaust in the direction of the exhaust pipe, forming air circulation, and blowing the heat generated by the disc heating tube to the drying plate to dry the material.

[0026] In this embodiment, in order to facilitate the placement and removal of the drying plate, so as to facilitate the collection of materials, the fixing strip 6 and the drying plate 7 are detachably connected, and the side surfaces of the two fixing strips 6 close to each other are symmetrically fixed with a receiving plate 63, and the drying plate 7 is placed across the two receiving plates 63, and the top of the fixing strip 6 is recessed inward to form a plug-in groove 64, and a side surface of the plug-in groove 64 close to the drying plate 7 is penetrated and slidably installed with an elastic positioning pin 65 along the height direction, and the side wall of the drying plate 7 is provided with a positioning hole 71 that cooperates with the elastic positioning pin 65, and a plug-in groove 64 is inserted inside for inserting the elastic positioning pin 65. The pin 65 pushes out and inserts the extrusion bar 66 of the positioning hole 71, and the top of the extrusion bar 66 passes through the plug-in groove 64. When drying is to be carried out, the material is poured into the drying plate, and then the drying plate is placed across the two receiving plates. After the position of the drying box is positioned, the extrusion bar is inserted into the plug-in groove, and the elastic positioning pin is squeezed out and inserted into the positioning hole through the extrusion bar to complete the fixing of the drying plate. When the drying plate is to be taken out, it is only necessary to pull out the extrusion bar so that the elastic positioning pin returns to its original position under the action of the restoring force and is separated from the drying plate, and then the drying plate can be taken out.

[0027] In this embodiment, the elastic locating pin 65 includes a locating pin 651, and a locating block 652 is installed at one end of the locating pin 651 located inside the plug-in slot 64. A spring 653 is sleeved on the outer wall of the locating pin 651, and the spring 653 is located between the locating block 652 and the inner wall of the plug-in slot 64. The locating block 652 and the side surface close to the bottom of the extrusion strip 66 are provided with matching inclined surfaces, wherein the spring can be deformed and stored force through the extrusion action of the locating block when the locating pin passes through, and begins to recover after losing the external force, so that the locating pin is separated from the locating hole.

[0028] In this embodiment, in order to further locate the installation position of the drying plate, a positioning groove 72 cooperating with the fixing strip 6 is provided on the side wall of the drying plate 7. When the drying plate is placed, the positioning groove can be aligned with the fixing strip before being placed, thereby realizing the horizontal positioning of the drying plate.

[0029] The specific drying process of the above production device is as follows: The furanone to be dried is poured into the drying plate 7 and spread flat, and then the drying plate 7 is placed and fixed on the fixing bar 6. The specific process is: first, the positioning grooves 72 on both sides of the drying plate 7 are aligned with the fixing bar 6 and the drying plate 7 is put down, so that the drying plate 7 is placed across the receiving plates 63 on both sides, and then the extrusion bar 66 is inserted from the top of the plug-in groove 64. The extrusion bar 66 sequentially extrude and insert the positioning pins 651 of different heights into the positioning holes 71 to complete the fixing of the drying plate 7.

[0030] Then the cover plate 2 is lowered and placed on the top of the drying box 1 (it can be driven by a lifting cylinder) to form a closed space, and then the driving motor 131 and the disc heating tube 15 are started respectively, and the driving motor 131 drives the exhaust fan 137 and the turntable 133 to rotate respectively, wherein the exhaust fan 137 rotates to transport the heat generated by the disc heating tube 15 to the drying plate 7 and through the drying hole 8 for drying, and the turntable 133 rotates to drive the pin 134 to rotate, so that the sliding bar 135 and the two sliding rods 132 slide back and forth, and the sliding rod 132 drives the fixed rod 112, the threaded sleeve 111, the connecting shaft 11, the fixed bar 6 and the drying plate 7 to slide back and forth, so that the material inside the drying plate 7 is shaken back and forth, thereby achieving shaking and drying, and avoiding material accumulation and affecting the drying efficiency; At the same time, when the fixed bar 6 and the drying plate 7 slide, due to the mutual cooperation between the sliding shaft 5 and the V-shaped groove 4, the drying plate 7 can slide up and down while sliding back and forth, so that the material inside the drying plate 7 jumps up and down, further improving the drying efficiency, and when the sliding shaft 5 moves downward along the inclined section of the V-shaped groove 4, the height of the drying plate 7 can be gradually reduced, so that the cleaning needle 122 can be gradually inserted into the drying hole 8 (due to the synchronous sliding between the connecting shaft 11 and the drying plate 7, the cleaning needle 122 can also keep sliding synchronously with the drying plate 7), and the material blocked in the drying hole 8 is pushed out of the drying hole 8, so as to avoid the drying hole 8 being blocked and affecting the circulation of hot air, and when the sliding shaft 5 slides upward along the inclined section of the V-shaped groove 4, the height of the drying plate 7 gradually increases, and the cleaning needle 122 gradually separates from the drying plate 7.

[0031] When the drying plate 7 slides back and forth to one side of the V-shaped groove 4 (at this time the cleaning needle 122 is out of the drying hole 8), the rotating gear 112 gradually meshes with the rack 14, driving the rotating gear 112 and the connecting shaft 11 to rotate, thereby driving the threaded sleeve 111, the fixing rod 121 and the cleaning needle 122 to slide for a distance, and then the drying plate 7 continues to slide back. Since the rotating gear 112 and the connecting shaft 11 are connected by a one-way bearing, the rotating gear 112 will produce idling at this time, and then the drying plate 7 gradually slides to the horizontal section of the V-shaped groove 4, so that the cleaning needle 122 is inserted into the drying hole 8 at a different position again and cleaned. In this way, the drying hole 8 of the drying plate 7 is continuously processed back and forth to avoid the phenomenon of clogging of the drying hole 8.

[0032] After drying is completed, the cover plate 2 is opened, and then the extrusion strip 66 on the plug-in slot 64 is removed, so that the positioning pin 651 returns to its original position and disengages from the positioning hole 71 under the action of the restoring force of the spring 653, and then the drying plate 7 is taken out to collect the material, completing the drying process of furanone.

[0033] Please refer to Figure 1-11 As shown, the second embodiment of the present invention is: A method for preparing furanone comprises the following steps: S1. preparing a hexanedione solution: adding a certain amount of acetone aldehyde and acetic acid to a reaction kettle in sequence and stirring and mixing, adding a certain amount of zinc powder to a reaction bottle after the mixing is completed, and stirring and dissolving while adding, while maintaining the temperature of the reaction bottle within the range of 30° C. during the adding process, obtaining an intermediate product hexanedione solution after the addition and dissolution is completed; The specific process of adding zinc powder is as follows: after stirring acetone aldehyde and acetic acid for 15 minutes, 1 / 3 of zinc powder is added and stirred until completely dissolved, and then the mixture is allowed to stand for 8 minutes; 1 / 3 of zinc powder is added again and stirred until completely dissolved, and then the mixture is allowed to stand for 10 minutes; finally, the remaining 1 / 3 of zinc powder is added and stirred until completely dissolved; meanwhile, the temperature of the zinc powder can be controlled by a water bath temperature control method during the addition process; S2, hexanedione purification: sodium sulfate is added to the hexanedione solution prepared in step S1, and centrifugation is performed, and ethyl acetate extraction agent is added to the separated liquid phase for extraction, and the extraction is performed in an extraction device to obtain an extraction solution, and then the extraction solution is introduced into an evaporation concentration device 1 for oil phase evaporation concentration, and ethyl acetate and distilled water are recovered to obtain an extraction concentrate; the concentrate is subjected to freeze crystallization, and then centrifugation is performed to obtain a hexanedione mother liquor and purified hexanedione; S3, preparation of furanone semi-finished product: adding the purified hexanedione to a sodium dihydrogen phosphate solution, stirring and mixing to dissolve, adding acetic acid to adjust the pH value of the solution, and then after the cyclization reaction is complete, standing and cooling at room temperature for a period of time, separating the oil phase and the water phase; and concentrating the oil phase through an evaporation concentration device 1 to recover butyl acetate, to obtain a liquid phase furanone semi-finished product; S4, preparation of finished furanone: freezing and crystallizing the liquid furanone semi-finished product and centrifuging to obtain crude furanone, and refining and purifying the crude furanone to obtain the finished furanone; The method for refining and purifying crude furanone is as follows: crude furanone particles are put into an extraction kettle, CO2 is cooled and pressurized to a predetermined pressure by a high-pressure pump, and the extraction pressure of the extraction device is set, and the extraction device is used for separation to obtain a refined furanone I, and then the refined furanone I is dissolved in an ethanol-acetone mixture and crystallized and purified, and then dried using the production equipment in Example 1 to obtain the refined furanone.

[0034] The structures and principles of the reaction kettle, centrifuge, extraction device and cyclization reaction kettle in this embodiment can all adopt the same equipment as in the existing preparation method, and will not be described in detail in this embodiment.

[0035] In the present invention, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A furanone production device, comprising a drying box (1), wherein the top of the drying box (1) is provided with a cover plate (2) that can be raised and lowered, and the top of the cover plate (2) is connected to a telescopic exhaust pipe (3), characterized in that: The drying box (1) has two opposite side walls of the inner cavity symmetrically provided with V-shaped slide grooves (4), and the bottom of the V-shaped slide grooves (4) is provided with a horizontal section, two of the V-shaped slide grooves (4) are symmetrically slidably connected with sliding shafts (5), and the two sliding shafts (5) are symmetrically installed with fixing bars (6) at one end close to each other, and a drying plate (7) with a bottom recessed inwardly is installed between the two fixing bars (6), and the drying plate (7) is located above the V-shaped slide grooves (4), and a plurality of drying holes (8) are provided at the bottom of the drying plate (7), and the two opposite side walls of the drying box (1) are symmetrically provided with horizontal linear slide grooves (9), and the horizontal linear slide grooves (9) are located between the V-shaped slide grooves (4) and the drying plate (7), and the horizontal linear slide grooves (9) are slidably connected with a first sliding block (10), and the two first A connecting shaft (11) is installed between the ends of the sliders (10) that are close to each other, and the connecting shaft (11) passes through the two fixing bars (6) and is slidably connected to the fixing bars (6). A cleaning component (12) for cleaning the drying hole (8) is installed on the top of the connecting shaft (11), and when the sliding shaft (5) slides to the horizontal section of the V-shaped slide groove (4), the top of the cleaning component (12) passes through the drying hole (8), and when the sliding shaft (5) slides to the inclined sections on both sides of the V-shaped slide groove (4), the cleaning component (12) is separated from the drying hole (8). A reciprocating drive mechanism (13) is installed at the bottom of the drying box (1), and the reciprocating drive mechanism (13) is connected to the cleaning component (12) and drives the cleaning component (12) and the connecting shaft (11) to slide back and forth along the horizontal linear slide groove (9).

2. A furanone production equipment according to claim 1, characterized in that: The cleaning assembly (12) comprises a plurality of fixed rods (121) connected to the connecting shaft (11); cleaning needles (122) arranged corresponding to the drying holes (8) are fixedly connected to the tops of the fixed rods (121); connecting rods (123) are symmetrically mounted at both ends of the bottoms between the plurality of fixed rods (121); and the connecting rods (123) are connected to the reciprocating drive mechanism (13).

3. A furanone production equipment according to claim 2, characterized in that: The drying holes (8) are arranged in a rectangular array, the connecting shaft (11) is a reciprocating screw, the connecting rod (123) is slidably connected to the reciprocating drive mechanism (13), the outer wall of the connecting shaft (11) is threadedly connected to a threaded sleeve (111), the fixing rod (121) is fixedly connected to the threaded sleeve (111), the inner cavity walls of the drying box (1) are symmetrically fixed with horizontally arranged racks (14), and the racks (14) are located above one end of the horizontal linear slide groove (9), and the outer wall of the connecting shaft (11) is provided with a rotating gear (112) meshingly connected to the rack (14) via a one-way bearing.

4. A furanone production equipment according to claim 3, characterized in that: The fixing bar (6) is penetrated by a limiting groove (61), a second sliding block (62) is slidably connected between the inner walls of the limiting groove (61), and the connecting shaft (11) is rotationally connected to the second sliding block (62).

5. A furanone production equipment according to claim 3, characterized in that: The reciprocating drive mechanism (13) comprises a drive motor (131) mounted on the bottom of the drying box (1) and sliding rods (132) respectively connected in a sliding manner to two connecting rods (123); an output end of the drive motor (131) passes through the bottom of the drying box (1) and is mounted with a turntable (133); a pin (134) is mounted on the top of the turntable (133); a sliding bar (135) cooperating with the pin (134) is mounted between the ends of the two sliding rods (132) that are close to each other; and the sliding bar (135) is provided with a strip groove (136) cooperating with the pin (134).

6. A furanone production equipment according to claim 5, characterized in that: An exhaust fan (137) is fixedly connected to the outer wall of the output end of the drive motor (131), and the exhaust fan (137) is located below the turntable (133). A disc-type heating tube (15) is installed between the side walls of the inner cavity of the drying box (1), and the disc-type heating tube (15) is located between the exhaust fan (137) and the turntable (133).

7. A furanone production equipment according to claim 1, characterized in that: The fixing strip (6) and the drying plate (7) are detachably connected, and a receiving plate (63) is symmetrically fixedly connected to a side surface of the two fixing strips (6) close to each other, and the drying plate (7) is placed across the two receiving plates (63). The top of the fixing strip (6) is recessed inward to form a plug-in groove (64), and an elastic positioning pin (65) is slidably installed through the side surface of the plug-in groove (64) close to the drying plate (7) along the height direction. A positioning hole (71) that cooperates with the elastic positioning pin (65) is opened on the side wall of the drying plate (7), and an extrusion strip (66) for pushing out the elastic positioning pin (65) and inserting it into the positioning hole (71) is inserted into the plug-in groove (64), and the top of the extrusion strip (66) passes through the plug-in groove (64).

8. A furanone production equipment according to claim 7, characterized in that: The elastic positioning pin (65) comprises a positioning pin (651), one end of the positioning pin (651) located inside the plug-in slot (64) is provided with a positioning block (652), the outer wall of the positioning pin (651) is sleeved with a spring (653), and the spring (653) is located between the positioning block (652) and the inner wall of the plug-in slot (64), and a side surface of the positioning block (652) and the bottom of the extrusion strip (66) close to each other is provided with mutually matching inclined surfaces.

9. A furanone production equipment according to claim 7, characterized in that: The side wall of the drying plate (7) is provided with a positioning groove (72) that cooperates with the fixing strip (6).

10. A method for preparing furanone, characterized in that: The following steps are involved: S1, preparing a hexanedione solution: adding a certain amount of acetone aldehyde and acetic acid to a reaction kettle in sequence and stirring and mixing, adding a certain amount of zinc powder to a reaction bottle after the mixing is completed, and stirring and dissolving while adding, while maintaining the temperature of the reaction bottle in the range of 25 to 40° C. during the adding process, after the addition and dissolution are completed, obtaining an intermediate product hexanedione solution; S2, purification of hexanedione: adding sodium sulfate to the hexanedione solution prepared in step S1, and centrifuging, adding ethyl acetate extractant to the separated liquid phase for extraction, extracting in an extraction device to obtain an extraction solution, then introducing the extraction solution into an evaporation concentration device for oil phase evaporation concentration, recovering ethyl acetate and distilled water, and obtaining an extraction concentrate; freezing and crystallizing the concentrate, and centrifuging to obtain a hexanedione mother liquor and purified hexanedione; S3, preparation of furanone semi-finished product: adding purified hexanedione to sodium dihydrogen phosphate solution, stirring and mixing to dissolve, adding acetic acid to adjust the pH value of the solution, and then after the cyclization reaction is complete, standing and cooling at room temperature for a period of time, separating the oil phase and the water phase; and concentrating the oil phase through an evaporation concentration device to recover butyl acetate, to obtain a liquid phase furanone semi-finished product; S4. Preparation of finished furanone: freezing and crystallizing the liquid furanone semi-finished product and centrifuging to obtain crude furanone, and refining and purifying the crude furanone in turn, and drying to obtain finished furanone, and the drying is carried out using the production equipment described in any one of claims 1 to 9.

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