Preparation device and preparation method of N-acetyl amino acid

Abstract

The invention discloses a preparation device and a preparation method of N-acetyl amino acid, and relates to the technical field of N-acetyl amino acid preparation, the preparation device comprises a reaction kettle body, and also comprises a kettle cover arranged at the top of the reaction kettle body; the stirring assembly is driven by the driving mechanism; the stirring assembly comprises a rotating shaft, and the rotating shaft penetrates through the kettle cover and is rotationally connected with the kettle cover in a sealing manner; the two rotating frames are respectively arranged at the top and the bottom of the rotating shaft; through mutual cooperation of the stirring assembly, the gear transmission mechanism, the rotating motor, the threaded column screwing mechanism and the like, on one hand, angle adjustment of the fixed stirring blades is realized, so that the stirring efficiency is improved; and secondly, the L-shaped guide rod moves towards the inner wall of the reaction kettle body, and finally, the scraping rod is in contact with the inner wall of the reaction kettle body, so that the inner wall of the reaction kettle body can be scraped, and crystals are prevented from gathering and scaling on the inner wall.

Description

Technical Field

[0001] The present invention relates to the technical field of N-acetylamino acid preparation, and in particular to a device and method for preparing N-acetylamino acid. Background Art

[0002] N-acetylamino acids are a class of compounds whose structural feature is that an acetyl group (-COCH3) is attached to the amino group (-NH2) of the amino acid. This modification changes the chemical and physical properties of the amino acid, making it widely used in food, medicine and cosmetics.

[0003] The Chinese patent with publication number CN101723772A discloses a method for preparing N-acetylamino acid, comprising mixing amino acid and acetic acid in a molar ratio of 1:4-7, heating to 40-70°C, stirring and keeping warm for 1-6 hours; uniformly adding acetic anhydride equivalent to 1.0-1.4 times the molar number of the amino acid within 1-5 hours, stirring and keeping warm at 40-70°C for 1-4 hours; rapidly distilling under the conditions of vacuum degree of 0.07-0.08MPa and 60-90°C until the volume of the distilled liquid is 1.0-1.3 times the volume of the added acetic acid; then adding water 1-3 times the mass of the amino acid, stirring and cooling until crystals precipitate, leaving for 1-24 hours, separating the solid and the liquid, and drying the solid to obtain an N-acetylamino acid.

[0004] Although the above method can realize the preparation of N-acetylamino acid, the inner wall of the existing reactor is prone to cause particles to agglomerate and clump during the crystallization stage.

[0005] Therefore, it is necessary for the present invention to provide a preparation device and a preparation method of N-acetylamino acid to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a device and method for preparing N-acetylamino acid to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a device for preparing N-acetylamino acid, comprising a reactor body and a reactor cover, which is placed on the top of the reactor body; a stirring assembly driven by a driving mechanism; The stirring assembly includes a rotating shaft, which passes through the kettle cover and is sealingly and rotatably connected with the kettle cover; Two rotating racks, which are respectively placed on the top and bottom of the rotating shaft; Two symmetrically distributed hollow shafts, the bottom ends of which are rotatably connected to the bottom rotating frame, and the top ends of which are rotatably connected to the top rotating frame, and which are driven by a rotating motor through a gear transmission mechanism; A plurality of horizontal rotating rods arranged in an array, one end of which is rotatably connected to the peripheral side wall of the hollow shaft and extends into the cavity of the hollow shaft; An adjusting component, which is placed in the cavity of the hollow shaft and is used to adjust the rotation angle of the horizontal rotating rod; A fixed stirring blade, which is fixedly connected to the horizontal rotating rod and has a storage groove on its side wall; A scraper rod, which is slidably disposed in the receiving groove and can slide out of the fixed stirring blade; Two "L"-shaped guide rods are symmetrically arranged, one end of which is connected to the scraper rod and passes through the fixed stirring blade, and one end of which passes through the fixed stirring blade is reset and connected to the fixed stirring blade through a reset member; A collar is sleeved on the outside of the horizontal rotating rod and connected to the hollow shaft. Two spiral guide grooves are provided on its side wall to cooperate with the other end of the "L"-shaped guide rod. When the fixed stirring blade rotates from a horizontal state to a vertical state, the scraper rod and the fixed stirring blade can slide out of the receiving groove and collide with the inner wall of the reactor body.

[0008] Preferably, the "L"-shaped guide rod is reset and slidably connected to the scraper rod via an elastic reset component; A deformation accommodating groove, which is opened on the inner wall of the receiving groove and is located at the bottom of the scraper rod; An arc-shaped deformation piece, both ends of which are rotatably connected to the inner wall of the deformation accommodating groove, and the middle part of which is located on the side of the scraper rod close to the "L"-shaped guide rod; A first limiting column, which is disposed at the bottom of the scraper rod and can pull the arc-shaped deformation sheet to reset; A second limiting column, which is placed at the bottom of one end of the "L"-shaped guide rod close to the scraper rod and is located on the side of the arc-shaped deformation piece close to the horizontal rotating rod, and is limitedly slidably connected with the fixed stirring blade, and is used to push the arc-shaped deformation piece to deform; The centrifugal avoidance groove is arranged on the side wall of the spiral guide groove, and can make the "L"-shaped guide rod and the scraper rod slide toward the arc-shaped deformation sheet under the centrifugal stirring state.

[0009] Preferably, the fixed stirring blade is an arc-shaped plate, the receiving groove is provided on the arc-shaped side wall of the arc-shaped plate, and the side wall of the receiving groove is provided with two through holes cooperating with the “L”-shaped guide rod.

[0010] Preferably, the "L"-shaped guide rod is provided with a semicircular ball that cooperates with the spiral guide groove at one end outside the fixed stirring blade, and the reset member is a spring, one end of the spring is connected to the "L"-shaped guide rod, and the other end of the spring is connected to the fixed stirring blade.

[0011] Preferably, the adjustment assembly includes an adjustment rod, which is sleeved in the hollow shaft and connected to the hollow shaft in a sliding and limiting manner, and a first tooth groove is provided in the middle thereof to cooperate with the horizontal rotating rod; An adjusting gear, which matches with the first tooth groove and is fixedly connected with the horizontal rotating rod; A threaded column, which is rotatably connected to the adjusting rod and is threadedly connected to the top end of the inner side wall of the hollow shaft; The threaded column screwing mechanism is used to tighten or loosen the threaded column.

[0012] Preferably, the threaded column twisting mechanism includes a rotating assembly placed on the top of the kettle cover, which is used to cooperate with the threaded column to drive the threaded column to rotate; The telescopic component is placed on the top of the kettle cover and is used to drive the rotating component to be inserted into the lower part of the kettle cover and dock with the threaded column.

[0013] Preferably, the rotating assembly includes a rotating rod, which is movably connected to the kettle cover; The stepper motor is placed on the top of the telescopic assembly, and the output shaft of the stepper motor is connected to the top of the rotating plug rod through a gear pair.

[0014] Preferably, the reactor body is a double-layer structure, the inner and outer walls of which form a jacket cavity, and conduits are respectively provided at the top and bottom of the jacket cavity.

[0015] Preferably, it also includes a spiral heating tube, which is placed in the jacket cavity of the reactor body.

[0016] The present invention also provides a method for preparing N-acetylamino acid, comprising the following steps: Step 1: Stirring and keeping warm: adjust the rotation angle of the horizontal rotating rod by controlling the adjustment component to change the fixed stirring blade from a horizontal state to an inclined state, and then control the driving mechanism to work, and at the same time control the rotation motor to lock, and unlock the locking component, so that the fixed stirring blade rotates around the rotating shaft on one side and around the hollow shaft on the other side, so as to perform multi-angle stirring; Step 2: distillation: the reactor body is controlled to distill under the conditions of vacuum degree of 0.07-0.08 MPa and 60-90° C.; Step 3: Stir and cool down until crystallization occurs. Adjust the rotation angle of the horizontal rotating rod by controlling the adjustment component to change the fixed stirring blade from an inclined state to a vertical state. In the process of the fixed stirring blade changing to a vertical state, the scraper rod moves toward the inner wall of the reactor body until it contacts the inner wall of the reactor body, so that the scraper rod scrapes and stirs the inner wall of the reactor body to prevent crystals from gathering and scaling on the inner wall.

[0017] Technical effects and advantages of the present invention: The present invention cooperates with each other among a stirring assembly, a gear transmission mechanism, a rotating motor and a threaded column twisting mechanism. The present invention controls the driving mechanism to work, controls the rotating motor to unlock, and controls the locking assembly to lock, so that the hollow shaft and the threaded column twisting mechanism are relative to each other, and then controls the telescopic assembly to contract, so that the rotating plug rod and the threaded column are plugged in, and then controls the rotating assembly to rotate, and controls the driving motor to lock, so that the threaded column and the hollow shaft are tightened or loosened, thereby pushing the adjusting rod to slide downward or upward, and the sliding of the adjusting rod will rotate the adjusting gear, thereby realizing the adjustment of the rotation angle of the horizontal rotating rod, and the rotation of the horizontal rotating rod will drive the fixed stirring blade to rotate, thereby realizing the angle adjustment of the fixed stirring blade, thereby improving the stirring efficiency.

[0018] The present invention enables the fixed stirring blade to change from an inclined state to a vertical state through the mutual cooperation among the stirring component, the gear transmission mechanism, the rotating motor and the threaded column twisting mechanism. In the process of the fixed stirring blade changing to the vertical state, the "L"-shaped guide rod will interfere with the spiral guide groove, so that the "L"-shaped guide rod moves toward the inner wall of the reactor body. At this time, the end of the scraper rod whose end has not completely slid out of the receiving groove completely slides out of the receiving groove, and finally the scraper rod contacts the inner wall of the reactor body, thereby being able to scrape the inner wall of the reactor body to prevent crystals from gathering and scaling on the inner wall.

[0019] 3. The present invention cooperates with the stirring assembly, the gear transmission mechanism, the rotating motor and the threaded column twisting mechanism. During centrifugal stirring, the present invention repeatedly increases and decreases the rotation speed of the driving mechanism. Due to the setting of the centrifugal avoidance groove, the "L"-shaped guide rod and the scraper rod can slide toward the arc-shaped deformation piece under the action of centrifugal force, collide with the arc-shaped deformation piece, and cause the "L"-shaped guide rod and the scraper rod to vibrate, thereby further improving the stirring efficiency and uniformity.

[0020] 4. The present invention utilizes the mutual cooperation among the stirring assembly, the gear transmission mechanism, the rotating motor and the threaded column twisting mechanism. When the scraper rod is worn, the elastic force of the arc-shaped deformation sheet pushes the scraper rod to move toward the inner wall of the reactor body, thereby avoiding the situation where the scraper rod cannot scrape the wall due to wear of the scraper rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0022] Figure 2 It is a schematic diagram of the internal structure of the reactor body and the top structure of the reactor cover in the present invention.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure inside the reactor body of the present invention.

[0024] Figure 4 It is a schematic diagram of the connection between the hollow shaft and the adjustment component structure of the present invention.

[0025] Figure 5 It is an exploded schematic diagram of some parts of the hollow shaft and the adjustment assembly of the present invention.

[0026] Figure 6 This is a structural connection diagram of the fixed stirring blade and the horizontal rotating rod in the present invention.

[0027] Figure 7 For the present invention Figure 6 Schematic diagram of the structure from another angle.

[0028] Figure 8 For the present invention Figure 6 Exploded diagram of structural parts.

[0029] Fig. 9 For the present invention Figure 6 3D cross-sectional view of the structure.

[0030] Fig.10 For the present invention Fig. 9 Structural section view of some parts.

[0031] Fig.11 It is a cross-sectional view of the connection structure between the scraper rod and the "L"-shaped guide rod in the present invention.

[0032] Fig.12 For the present invention Fig.11 Bottom view of the structure.

[0033] Fig.13 For the present invention Fig.11 A schematic diagram of the enlarged structure of part A.

[0034] Fig.14 It is a schematic diagram of the structure of the locking assembly of the present invention.

[0035] Fig.15 It is a schematic diagram of the structural connection between the rotating component and the telescopic component in the present invention.

[0036] Fig.16 It is a cross-sectional view of the reaction kettle body structure in the present invention.

[0037] In the figure: 1, reactor body; 101, jacket cavity; 102, conduit; 103, spiral heating tube; 2, reactor cover; 3, stirring assembly; 301, rotating shaft; 302, rotating frame; 303, hollow shaft; 304, horizontal rotating rod; 305, fixed stirring blade; 3051, through hole; 306, receiving groove; 307, scraper rod; 308, "L" shaped guide rod; 309, collar; 310, spiral guide groove; 311, arc-shaped deformation sheet; 312, first limiting column; 313, second limiting column; 314, centrifugal avoidance groove; 315. Sliding groove; 316. Deformation accommodating groove; 4. Driving mechanism; 5. Gear transmission mechanism; 501. First gear; 502. Sleeve shaft; 503. Transmission gear; 504. Driven wheel; 6. Rotating motor; 7. Adjusting assembly; 701. Adjusting rod; 702. First tooth groove; 703. Threaded column; 8. Rotating assembly; 801. Rotating rod; 802. Stepping motor; 9. Telescopic assembly; 10. Locking assembly; 1001. Fixed frame; 1002. Electric telescopic column; 1003. Turntable; 1004. Limit block. DETAILED DESCRIPTION

[0038] 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.

[0039] The present invention provides Figures 1 to 16 The N-acetylamino acid preparation device shown includes a reactor body 1 and a reactor cover 2, which is placed on the top of the reactor body 1. The present invention facilitates maintenance of the interior of the reactor body 1 by setting the reactor cover 2, and the reactor cover 2 is sealed and connected to the reactor body 1 by bolts.

[0040] Specifically, the reactor body 1 is a double-layer structure, and its inner and outer walls form a jacket cavity 101. The top and bottom of the jacket cavity 101 are respectively provided with conduits 102. By providing the conduits 102, the present invention can inject cooling liquid into the jacket cavity 101, thereby cooling the reactor body 1.

[0041] It also includes a spiral heating tube 103, which is placed in the jacket cavity 101 of the reactor body 1. The present invention uses the spiral heating tube 103 to heat the reactor body 1 so that the required temperature can be reached.

[0042] The stirring assembly 3 is driven by a driving mechanism 4. The present invention controls the driving mechanism 4 to work, and the driving mechanism 4 drives the stirring assembly 3 to rotate, so as to fully stir the material in the reactor body 1. The driving mechanism 4 includes a driving motor.

[0043] The stirring assembly 3 includes a rotating shaft 301, which passes through the kettle cover 2 and is sealed and rotatably connected to the kettle cover 2; specifically, the rotating shaft 301 is transmission-connected to the driving mechanism 4; the present invention controls the operation of the driving mechanism 4, and the operation of the driving mechanism 4 will drive the rotating shaft 301 to rotate.

[0044] Two rotating frames 302 are respectively disposed at the top and bottom of the rotating shaft 301 ; the present invention can support the hollow shaft 303 by arranging the rotating frames 302 .

[0045] Two symmetrically distributed hollow shafts 303 have their bottom ends rotationally connected to the bottom rotating frame 302, and their top ends are rotationally connected to the top rotating frame 302, and are driven by a rotating motor 6 through a gear transmission mechanism 5. The present invention controls the operation of the rotating motor 6, and the operation of the rotating motor 6 will drive the hollow shaft 303 to rotate through the gear transmission mechanism 5. The rotation of the hollow shaft 303 will drive the fixed stirring blade 305 to rotate, thereby achieving stirring of the material in the reactor body 1.

[0046] One end of a plurality of horizontal rotating rods 304 arranged in an array is rotatably connected to the peripheral side wall of the hollow shaft 303 and extends into the cavity of the hollow shaft 303 .

[0047] The adjustment component 7 is placed in the cavity of the hollow shaft 303 and is used to adjust the rotation angle of the horizontal rotating rod 304 .

[0048] The fixed stirring blade 305 is fixedly connected to the horizontal rotating rod 304, and a storage groove 306 is provided on its side wall. By setting the fixed stirring blade 305, the present invention can adjust the rotation angle of the horizontal rotating rod 304 through the adjustment component 7. The rotation of the horizontal rotating rod 304 will drive the fixed stirring blade 305 to rotate, thereby adjusting the angle of the fixed stirring blade 305, thereby increasing the inclination degree of the fixed stirring blade 305 and increasing the stirring efficiency.

[0049] The scraper rod 307 is slidably placed in the receiving groove 306 and can slide out of the fixed stirring blade 305. The present invention provides the scraper rod 307 so that the scraper rod 307 can slide out of the fixed stirring blade 305 and contact the inner wall of the reactor body 1, thereby achieving the function of scraping the inner wall.

[0050] Two “L”-shaped guide rods 308 are symmetrically arranged, one end of which is connected to the scraper rod 307 and passes through the fixed stirring blade 305, and one end of which passes through the fixed stirring blade 305 is reset and connected to the fixed stirring blade 305 through a reset member.

[0051] The collar 309 is sleeved outside the horizontal rotating rod 304 and connected to the hollow shaft 303 . The side wall of the collar 309 is provided with two spiral guide grooves 310 which cooperate with the other end of the “L”-shaped guide rod 308 .

[0052] The present invention provides an "L"-shaped guide rod 308 and a spiral guide groove 310. When the fixed stirring blade 305 rotates from a horizontal state to a vertical state, the "L"-shaped guide rod 308 and the spiral guide groove 310 always keep in contact with each other. Under the push of the spiral guide groove 310, the "L"-shaped guide rod 308 slides toward the inner wall of the reactor body 1. The sliding of the "L"-shaped guide rod 308 pushes the scraper rod 307 to slide, so that the scraper rod 307 and the fixed stirring blade 305 slide out of the receiving groove 306 and contact the inner wall of the reactor body 1.

[0053] The "L"-shaped guide rod 308 is reset and slidably connected to the scraper rod 307 via an elastic reset component. The present invention provides an elastic reset component to push the scraper rod 307 to reset.

[0054] The deformation accommodating groove 316 is formed on the inner wall of the receiving groove 306 and is located at the bottom of the scraper rod 307 . The present invention provides the deformation accommodating groove 316 so that the arc-shaped deformation piece 311 has a deformation space.

[0055] The arc-shaped deformation piece 311 has its two ends rotatably connected to the inner wall of the deformation accommodating groove 316, and its middle part is located on the side of the scraper rod 307 close to the "L"-shaped guide rod 308; by setting the arc-shaped deformation piece 311, the present invention can make the second limiting column 313 collide with the arc-shaped deformation piece 311 during centrifugal stirring, so that the "L"-shaped guide rod 308 and the scraper rod 307 vibrate, thereby further improving the stirring efficiency.

[0056] The first limiting column 312 is disposed at the bottom of the scraper rod 307 and can pull the arc-shaped deformation piece 311 to return to its original position.

[0057] The second limiting column 313 is placed at the bottom of one end of the "L"-shaped guide rod 308 close to the scraper rod 307, and is located on the side of the arc-shaped deformation piece 311 close to the horizontal rotating rod 304. It is limitedly slidably connected with the fixed stirring blade 305, and is used to push the arc-shaped deformation piece 311 to deform.

[0058] The centrifugal avoidance groove 314 is provided on the side wall of the spiral guide groove 310 , and can make the “L”-shaped guide rod 308 and the scraper rod 307 slide toward the arc-shaped deformation sheet 311 in the centrifugal stirring state.

[0059] The elastic reset component includes a sliding groove 315 formed in the scraper rod 307 , and the sliding groove 315 is slidably connected to the “L”-shaped guide rod 308 .

[0060] The sliding groove 315 and the “L”-shaped guide rod 308 are connected via a spring.

[0061] The present invention provides the centrifugal avoidance groove 314 , so that during centrifugal stirring, the “L”-shaped guide rod 308 and the scraper rod 307 can slide toward the arc-shaped deformation piece 311 under the action of centrifugal force and collide with the arc-shaped deformation piece 311 .

[0062] The fixed stirring blade 305 is an arc-shaped plate, and the receiving groove 306 is opened on the arc-shaped side wall of the arc-shaped plate. The side wall of the receiving groove 306 is opened with two through holes 3051 that cooperate with the "L"-shaped guide rod 308. The present invention sets the fixed stirring blade 305 as an arc-shaped plate, so that when the fixed stirring blade 305 adjusts its angle, it will not cause the two sides of the fixed stirring blade 305 to conflict with the inner wall of the reactor body 1.

[0063] The present invention provides the receiving groove 306 to accommodate the scraper rod 307 inside the fixed stirring blade 305, thereby avoiding the situation that the fixed stirring blade 305 cannot be adjusted in angle due to the two ends of the scraper rod 307 conflicting with the inner wall of the reactor body 1.

[0064] One end of the "L"-shaped guide rod 308 located outside the fixed stirring blade 305 is provided with a semi-circular ball that cooperates with the spiral guide groove 310, and the reset member is a spring, one end of the spring is connected to the "L"-shaped guide rod 308, and the other end of the spring is connected to the fixed stirring blade 305; the present invention reduces the friction between the semi-circular ball and the spiral guide groove 310 by setting the semi-circular ball.

[0065] Specifically, the gear transmission mechanism 5 includes a first gear 501 connected to the output shaft of the rotary motor 6 .

[0066] The sleeve shaft 502 is rotatably connected to the kettle cover 2 and sleeved with the rotating shaft 301 . The top and bottom ends of the sleeve shaft 502 are provided with meshing gears. The top meshing gear meshes with the first gear 501 . A locking assembly 10 is provided between the sleeve shaft 502 and the rotating shaft 301 .

[0067] Two symmetrically arranged transmission gears 503 mesh with the bottom meshing gear.

[0068] The driven wheel 504 is meshed with the transmission gear 503 and is fixedly sleeved with the hollow shaft 303 .

[0069] The present invention sets a gear transmission mechanism 5. When the rotating motor 6 is working, it will drive the first gear 501 to rotate. The rotation of the first gear 501 will drive the sleeve shaft 502 to rotate through the top meshing gear. The rotation of the sleeve shaft 502 will drive the transmission gear 503 to rotate through the bottom meshing gear. The rotation of the transmission gear 503 will drive the driven wheel 504 to rotate. The rotation of the driven wheel 504 will drive the hollow shaft 303 to rotate, so that the hollow shaft 303 drives the fixed stirring blade 305 to rotate.

[0070] Specifically, the locking assembly 10 includes a fixed frame 1001, an electric telescopic column 1002 is provided at the bottom of the fixed frame 1001, a turntable 1003 is rotatably connected to the bottom of the electric telescopic column 1002, a limit block 1004 is provided at the bottom of the turntable 1003, and the side walls of the sleeve shaft 502 and the rotating shaft 301 are both provided with limit grooves that cooperate with the limit block 1004.

[0071] The present invention controls the electric telescopic column 1002 to extend, and the extension of the electric telescopic column 1002 causes the limit block 1004 to be inserted into the limit grooves of the sleeve shaft 502 and the rotating shaft 301, thereby locking the sleeve shaft 502 and the rotating shaft 301.

[0072] The adjusting assembly 7 includes an adjusting rod 701 which is sleeved in the hollow shaft 303 and is slidably and position-limitedly connected to the hollow shaft 303 , and a first tooth groove 702 which cooperates with the horizontal rotating rod 304 is formed in the middle thereof.

[0073] The adjusting gear cooperates with the first tooth groove 702 and is fixedly connected to the horizontal rotating rod 304. The present invention provides the adjusting gear and the first tooth groove 702, so that when the adjusting rod 701 moves up and down, the adjusting gear rotates to adjust the horizontal rotating rod 304.

[0074] The threaded column 703 is rotatably connected to the adjusting rod 701 and is threadedly connected to the top end of the inner wall of the hollow shaft 303 .

[0075] The threaded column screwing mechanism is used to tighten or loosen the threaded column 703.

[0076] The present invention rotates the threaded column 703 by screwing the threaded column screwing mechanism. The rotation of the threaded column 703 will tighten or loosen the hollow shaft 303, thereby pushing the adjustment rod 701 to slide downward or upward. The sliding of the adjustment rod 701 will rotate the adjustment gear, thereby adjusting the rotation angle of the horizontal rotating rod 304.

[0077] The threaded column screwing mechanism includes a rotating assembly 8 placed on the top of the kettle cover 2, which is used to cooperate with the threaded column 703 to drive the threaded column 703 to rotate.

[0078] The threaded column screwing mechanism also includes a telescopic component 9, which is placed on the top of the kettle cover 2 and is used to drive the rotating component 8 to insert into the lower part of the kettle cover 2 and dock with the threaded column 703.

[0079] The present invention controls the telescopic component 9 to extend and retract, which drives the rotating component 8 to engage with the threaded column 703, and then controls the rotating component 8 to work, which drives the threaded column 703 to rotate.

[0080] The rotating assembly 8 includes a rotating rod 801 which is movably connected to the kettle cover 2 through the rotating rod 801 .

[0081] The stepper motor 802 is placed on the top of the telescopic assembly 9, and its output shaft is transmission-connected to the top of the rotating plug rod 801 through a gear pair.

[0082] The present invention controls the stepper motor 802 to rotate, and the rotation of the stepper motor 802 drives the rotating rod 801 to rotate, and the rotation of the rotating rod 801 drives the threaded column 703 to rotate, thereby realizing the screwing of the threaded column 703.

[0083] First, amino acids and acetic acid are mixed in a molar ratio of 1:4-7, and then the spiral heating tube 103 is controlled to raise the temperature of the reactor body 1 to 40-70°C, and the mixture is stirred and kept warm for 1-6 hours; within 1-5 hours, acetic anhydride equivalent to 1.0-1.4 times the molar number of the amino acid is uniformly added, and then the mixture is stirred and kept warm for 1-4 hours at 40-70°C; under the conditions of vacuum degree of 0.07-0.08MPa and 60-90°C, the mixture is rapidly distilled until the volume of the distilled liquid is 1.0-1.3 times the volume of the added acetic acid; then water 1-3 times the mass of the amino acid is added, and the mixture is stirred and cooled until crystals are precipitated.

[0084] During the stirring process, the present invention controls the driving mechanism 4 to work, controls the rotating motor 6 to unlock, and controls the locking assembly 10 to lock. The driving mechanism 4 will drive the rotating shaft 301 to rotate, and the rotation of the rotating shaft 301 will drive the rotating frame 302 to rotate. The rotation of the rotating frame 302 will drive the hollow shaft 303 to rotate. The rotation of the hollow shaft 303 will drive the fixed stirring blade 305 to rotate to a relative position with the threaded column screwing mechanism, and then the telescopic assembly 9 is controlled to contract. The contraction of the telescopic assembly 9 will drive the rotating plug rod 801 of the rotating assembly 8 to plug into the threaded column 703, and then the rotating assembly 8 is controlled to rotate. The rotation of the rotating assembly 8 will tighten or loosen the threaded column 703 and the hollow shaft 303, thereby pushing the adjusting rod 701 to slide downward or upward. The sliding of the adjusting rod 701 will rotate the adjusting gear, thereby adjusting the rotation angle of the horizontal rotating rod 304. The rotation of the horizontal rotating rod 304 will drive the fixed stirring blade 305 to rotate, so that the fixed stirring blade 305 changes from a horizontal state to an inclined state, and then the telescopic assembly 9 is controlled to extend and reset.

[0085] During the rotation of the fixed stirring blade 305, the "L"-shaped guide rod 308 will conflict with the spiral guide groove 310, so that the "L"-shaped guide rod 308 moves toward the inner wall of the reactor body 1. At this time, the two ends of the scraper rod 307 do not slide out of the receiving groove 306, and finally the angle adjustment of the fixed stirring blade 305 is achieved.

[0086] Then, by controlling the driving mechanism 4 to work, the rotating motor 6 is locked and the locking assembly 10 is unlocked, so that the fixed stirring blade 305 rotates around the rotating shaft 301 on one side and around the hollow shaft 303 on the other side, thereby achieving multi-angle stirring and improving the uniformity of stirring.

[0087] During centrifugal stirring, the present invention repeatedly increases and decreases the rotational speed of the driving mechanism 4. When the rotational speed increases, the centrifugal force of the "L"-shaped guide rod 308 increases. Due to the setting of the centrifugal avoidance groove 314, after the "L"-shaped guide rod 308 overcomes the elastic force of the spring, the "L"-shaped guide rod 308 and the scraper rod 307 can slide toward the arc-shaped deformation piece 311 under the action of centrifugal force, and collide with the arc-shaped deformation piece 311, causing the "L"-shaped guide rod 308 and the scraper rod 307 to vibrate, thereby further improving the stirring efficiency and uniformity.

[0088] When crystallization is precipitated, the present invention controls the driving mechanism 4 to work, controls the rotating motor 6 to unlock, and controls the locking assembly 10 to lock. The driving mechanism 4 will drive the rotating shaft 301 to rotate, the rotating shaft 301 will drive the rotating frame 302 to rotate, the rotating frame 302 will drive the hollow shaft 303 to rotate, the hollow shaft 303 will drive the fixed stirring blade 305 to rotate to a relative position with the threaded column screwing mechanism, and then controls the driving motor to lock, controls the locking assembly 10 to unlock, and controls the rotating motor 6 to rotate until the horizontal rotating rod 304 is symmetrical with the initial position about the hollow shaft 303. The initial position of the horizontal rotating rod 304 is as shown in FIG. Figure 3 Then the telescopic assembly 9 is controlled to retract, and the retracted telescopic assembly 9 will drive the rotating rod 801 of the rotating assembly 8 to plug into the threaded column 703, and then the rotating assembly 8 is controlled to rotate, and the rotating motor 6 is controlled to lock to prevent the hollow shaft 303 from rotating. The rotation of the rotating assembly 8 will tighten or loosen the threaded column 703 and the hollow shaft 303, thereby pushing the adjusting rod 701 to slide downward or upward. The sliding of the adjusting rod 701 will rotate the adjusting gear, thereby adjusting the rotation angle of the horizontal rotating rod 304. The rotation of the horizontal rotating rod 304 will drive the fixed stirring blade 305 to rotate, so that the fixed stirring blade 305 can rotate. The blade 305 changes from an inclined state to a vertical state. In the process of the fixed stirring blade 305 changing to a vertical state, the "L"-shaped guide rod 308 will conflict with the spiral guide groove 310. Under the guiding action of the spiral guide groove 310, the "L"-shaped guide rod 308 moves toward the inner wall of the reactor body 1. The movement of the "L"-shaped guide rod 308 will push the second limiting column 313 to slide. The sliding of the second limiting column 313 will first conflict with the arc-shaped deformation piece 311. As the second limiting column 313 continues to slide, the arc-shaped deformation piece 311 will be pushed to deform. At this time, the scraper rod 307 and the "L"-shaped guide rod 308 are as shown in FIG. Fig.13As shown, when the "L"-shaped guide rod 308 moves to the end point of the spiral guide groove 310, the second limiting column 313 pushes the midpoint of the arc-shaped deformation piece 311 to cross the straight line formed by the line connecting the two ends of the arc-shaped deformation piece 311. Under the elastic force of the arc-shaped deformation piece 311, the arc-shaped deformation piece 311 will deform to a state opposite to the initial state of the arch. Since the "L"-shaped guide rod 308 moves to the end point of the spiral guide groove 310, the "L"-shaped guide rod 308 can no longer move. Under the elastic force of the arc-shaped deformation piece 311, the arc-shaped deformation piece 311 is deformed to a state opposite to the initial state. The first stop column 312 is pressed against the first stop column 314, and the first stop column 314 is pressed against the first stop column 314. Since the "L"-shaped guide rod 308 and the scraper rod 307 are connected by an elastic reset component, the arc-shaped deformation piece 311 will push the scraper rod 307 to move away from the "L"-shaped guide rod 308 after overcoming the elastic force of the elastic reset component. It should be emphasized that the elastic force of the arc-shaped deformation piece 311 is greater than the elastic force of the elastic reset component, and the scraper rod 307 finally moves to a state where it can contact the inner wall of the reactor body 1. The state is a pre-stretched state. At this time, the distance between the scraper rod 307 and the hollow shaft 303 is greater than the distance between the inner wall of the reactor body 1 and the hollow shaft 303. Then the driving mechanism 4 is controlled to be locked, the locking assembly 10 is unlocked, and the rotary motor 6 is operated, thereby driving the scraper rod 307 to collide with the inner wall of the reactor body 1. Since the distance between the scraper rod 307 and the hollow shaft 303 is greater than the distance between the inner wall of the reactor body 1 and the hollow shaft 303, under the reverse force of the inner wall of the reactor body 1, the scraper rod 307 slides toward the "L"-shaped guide rod 308 to pre-compress the arc-shaped deformation sheet 311. The scraper rod 307 is finally in a state of just contacting the inner wall of the reactor body 1. Then the driving mechanism 4 is controlled to be operated, the locking assembly 10 is locked, and the rotary motor 6 is unlocked, thereby driving the scraper rod 307 to stir the liquid in the reactor body 1 and scrape the inner wall of the reactor body 1. On the one hand, crystal stirring is achieved to improve the crystallization efficiency, and on the other hand, crystals are prevented from gathering and scaling on the inner wall.

[0089] When the scraper rod 307 is worn, the arc-shaped deformation piece 311 is pre-compressed. Under the elastic force of the arc-shaped deformation piece 311, the scraper rod 307 is pushed to move toward the inner wall of the reactor body 1, thereby avoiding the scraper rod 307 being unable to scrape the wall due to wear.

[0090] The present invention also provides a method for preparing N-acetylamino acid, comprising the following steps: Step 1: Stirring and keeping warm: adjust the rotation angle of the horizontal rotating rod 304 by controlling the adjusting component 7, so that the fixed stirring blade 305 changes from a horizontal state to an inclined state, and then control the driving mechanism 4 to work, and at the same time control the rotating motor 6 to lock, and the locking component 10 to unlock, so that the fixed stirring blade 305 rotates around the rotating shaft 301 on one side and around the hollow shaft 303 on the other side, thereby achieving multi-angle stirring; Step 2: distillation, controlling the reactor body 1 to rapidly distill under the conditions of vacuum degree 0.07-0.08 MPa and 60-90° C.; Step 3: Stir and cool until crystallization occurs. The horizontal rotating rod 304 is adjusted by controlling the adjusting component 7 to change the fixed stirring blade 305 from an inclined state to a vertical state. In the process of the fixed stirring blade 305 changing to a vertical state, the scraper rod 307 moves toward the inner wall of the reactor body 1 until it contacts the inner wall of the reactor body 1, so that the scraper rod 307 scrapes and stirs the inner wall of the reactor body 1 to prevent crystals from gathering and scaling on the inner wall.

[0091] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for preparing N-acetylamino acid, comprising a reactor body, characterized in that: It also includes a kettle cover, which is placed on the top of the reactor body; a stirring assembly driven by a driving mechanism; The stirring assembly includes a rotating shaft, which passes through the kettle cover and is sealingly and rotatably connected with the kettle cover; Two rotating racks, which are respectively placed on the top and bottom of the rotating shaft; Two symmetrically distributed hollow shafts, the bottom ends of which are rotatably connected to the bottom rotating frame, and the top ends of which are rotatably connected to the top rotating frame, and which are driven by a rotating motor through a gear transmission mechanism; A plurality of horizontal rotating rods arranged in an array, one end of which is rotatably connected to the peripheral side wall of the hollow shaft and extends into the cavity of the hollow shaft; An adjusting component, which is placed in the cavity of the hollow shaft and is used to adjust the rotation angle of the horizontal rotating rod; A fixed stirring blade, which is fixedly connected to the horizontal rotating rod and has a storage groove on its side wall; A scraper rod, which is slidably disposed in the receiving groove and can slide out of the fixed stirring blade; Two "L"-shaped guide rods are symmetrically arranged, one end of which is connected to the scraper rod and passes through the fixed stirring blade, and one end of which passes through the fixed stirring blade is reset and connected to the fixed stirring blade through a reset member; A collar is sleeved outside the horizontal rotating rod and connected to the hollow shaft, and its side wall is provided with two spiral guide grooves which cooperate with the other end of the "L"-shaped guide rod. When the fixed stirring blade is rotated from a horizontal state to a vertical state, the scraper rod and the fixed stirring blade can slide out of the receiving groove and collide with the inner wall of the reactor body.

2. A preparation device for N-acetylamino acid according to claim 1, characterized in that, The "L"-shaped guide rod is reset and slidably connected to the scraper rod via an elastic reset component; A deformation accommodating groove, which is opened on the inner wall of the receiving groove and is located at the bottom of the scraper rod; An arc-shaped deformation piece, both ends of which are rotatably connected to the inner wall of the deformation accommodating groove, and the middle part of which is located on the side of the scraper rod close to the "L"-shaped guide rod; A first limiting column, which is disposed at the bottom of the scraper rod and can pull the arc-shaped deformation sheet to reset; A second limiting column, which is placed at the bottom of one end of the "L"-shaped guide rod close to the scraper rod and is located on the side of the arc-shaped deformation piece close to the horizontal rotating rod, and is limitedly slidably connected with the fixed stirring blade, and is used to push the arc-shaped deformation piece to deform; The centrifugal avoidance groove is arranged on the side wall of the spiral guide groove, and can make the "L"-shaped guide rod and the scraper rod slide toward the arc-shaped deformation sheet under the centrifugal stirring state.

3. A preparation device for N-acetylamino acid according to claim 1, characterized in that, The fixed stirring blade is an arc-shaped plate, the receiving groove is arranged on the arc-shaped side wall of the arc-shaped plate, and the side wall of the receiving groove is provided with two through holes which match with the "L"-shaped guide rod.

4. A device for preparing N-acetylamino acid according to claim 1, characterized in that, The "L"-shaped guide rod has one end outside the fixed stirring blade and is provided with a semicircular ball that cooperates with the spiral guide groove. The reset member is a spring, one end of the spring is connected to the "L"-shaped guide rod, and the other end of the spring is connected to the fixed stirring blade.

5. A preparation device for N-acetylamino acid according to claim 1, characterized in that, The adjustment assembly includes an adjustment rod, which is sleeved in the hollow shaft and connected to the hollow shaft in a sliding and limiting manner, and a first tooth groove is provided in the middle thereof to cooperate with the horizontal rotating rod; An adjusting gear, which matches with the first tooth groove and is fixedly connected with the horizontal rotating rod; A threaded column, which is rotatably connected to the adjusting rod and is threadedly connected to the top end of the inner side wall of the hollow shaft; The threaded column screwing mechanism is used to tighten or loosen the threaded column.

6. A device for preparing N-acetylamino acid according to claim 5, characterized in that: The threaded column twisting mechanism includes a rotating assembly placed on the top of the kettle cover, which is used to cooperate with the threaded column to drive the threaded column to rotate; The telescopic component is placed on the top of the kettle cover and is used to drive the rotating component to be inserted into the lower part of the kettle cover and dock with the threaded column.

7. A device for preparing N-acetylamino acid according to claim 6, characterized in that: The rotating assembly includes a rotating rod, which is movably connected to the kettle cover; The stepper motor is placed on the top of the telescopic assembly, and the output shaft of the stepper motor is connected to the top of the rotating plug rod through a gear pair.

8. A device for preparing N-acetylamino acid according to claim 1, characterized in that: The reactor body is a double-layer structure, and its inner and outer walls form a jacket cavity, and conduits are respectively arranged at the top and bottom of the jacket cavity.

9. A device for preparing N-acetylamino acid according to claim 8, characterized in that, It also includes a spiral heating tube, which is placed in the jacket cavity of the reactor body.

10. A method for preparing N-acetylamino acid, wherein the method uses the device according to any one of claims 1 to 9 to prepare N-acetylamino acid, characterized in that: The following steps are involved: Step 1: Stirring and keeping warm: adjust the rotation angle of the horizontal rotating rod by controlling the adjustment component to change the fixed stirring blade from a horizontal state to an inclined state, and then control the driving mechanism to work, and at the same time control the rotation motor to lock, and unlock the locking component, so that the fixed stirring blade rotates around the rotating shaft on one side and around the hollow shaft on the other side, so as to perform multi-angle stirring; Step 2: distillation: the reactor body is controlled to distill under the conditions of vacuum degree of 0.07-0.08 MPa and 60-90° C.; Step 3: Stir and cool down until crystallization occurs. Adjust the rotation angle of the horizontal rotating rod by controlling the adjustment component to change the fixed stirring blade from an inclined state to a vertical state. In the process of the fixed stirring blade changing to a vertical state, the scraper rod moves toward the inner wall of the reactor body until it contacts the inner wall of the reactor body, so that the scraper rod scrapes and stirs the inner wall of the reactor body to prevent crystals from gathering and scaling on the inner wall.

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