A method for preparing and decolorizing high-concentration L-proline

Abstract

The invention relates to the technical field of L-proline preparation, and in particular to a decolorization method for preparing high-concentration L-proline, comprising the following steps: S1, dissolving; S2, activated carbon treatment; S3, filtering; S4, deep adsorption; S5, recrystallization; a decolorization device involved in the above step S2, wherein the decolorization device comprises a filter box fixedly connected by a support frame and a stirring box rotatably connected to the filter box; wherein a square cover plate with a feed inlet is plugged into the upper end of the filter box, and a filtering mechanism is arranged inside the filter box; a high-concentration L-proline solution is subjected to preliminary multi-layer filtration and secondary stirring filtration by the arranged decolorization device, and the multiple filtration modes have a better and more obvious effect on the adsorption and decolorization of the L-proline solution, and multiple operations are not required, thereby reducing the number of processes.

Description

Technical Field

[0001] The invention relates to the technical field of L-proline preparation, in particular to a decolorization treatment method for preparing high-concentration L-proline. Background Art

[0002] L-proline (abbreviated as proline) is one of the 20 amino acids that the human body synthesizes proteins. It is a colorless to white crystal or crystalline powder at room temperature, with a slight odor and a slightly sweet taste. It is easily soluble in water and ethanol, insoluble in ether, butanol and isopropanol, and soluble in inorganic acids. Amino acids are a general term for a class of organic compounds containing amino and carboxyl groups. The presence of amino acids in the human body not only provides an important raw material for synthesizing proteins, but also provides a material basis for promoting growth, conducting normal metabolism, and maintaining life.

[0003] In the preparation process of high-concentration L-proline, color may be generated due to the presence of impurities, and decolorization treatment is required. Activated carbon, as a material with strong adsorption performance, is a common decolorizer, which can effectively remove organic impurities and pigments. However, there are still some problems in the adsorption and decolorization process of activated carbon: First, activated carbon is generally packed in a permeable outer packaging bag. When adsorbing L-proline solution, the activated carbon in the carbon bag is easy to pile up together and cannot be fully utilized, resulting in low utilization rate of activated carbon; second, the L-proline solution is generally directly poured into the tank containing activated carbon, and the contact between the activated carbon and the L-proline solution is not high, resulting in incomplete one-time decolorization, and repeated operations are required. The steps are cumbersome and difficult to handle. Summary of the invention

[0004] The present invention provides a decolorization method for preparing high-concentration L-proline, which solves the problems existing in the background technology.

[0005] The present invention provides a method for preparing and decolorizing high-concentration L-proline, and the method for preparing and decolorizing high-concentration L-proline specifically comprises the following steps:

[0006] S1. Dissolution: Dissolve high concentration L-proline in an appropriate amount of solvent, usually water or an organic solvent, to ensure that the L-proline is completely dissolved.

[0007] S2, activated carbon treatment: the L-proline solution after the high concentration of L-proline in S1 is dissolved is poured into the filter box of the decolorization treatment device for preliminary filtration. The solution after the preliminary filtration will enter the stirring box for secondary activated carbon filtration and stirring at the same time, which helps the activated carbon to adsorb impurities and pigments in the solution.

[0008] S3. Filtration: Filter the solution containing activated carbon after treatment in S2 through filter paper or other appropriate filter materials to remove impurities and activated carbon particles.

[0009] S4, deep adsorption: The L-proline solution decolorized by S3 is deeply adsorbed by other adsorption materials to improve the decolorization effect and purity.

[0010] S5. Recrystallization: By controlling the temperature or the volatilization of the solvent, L-proline is promoted to recrystallize, thereby further improving its purity.

[0011] The decolorization treatment device involved in the above step S2 comprises a filter box fixedly connected by a support frame and a stirring box rotatably connected to the filter box; wherein a square cover plate with a feed port is inserted into the upper end of the filter box, a filtering mechanism is arranged inside the filter box, a transition outlet is opened on the side of the filter box near the bottom, and a tilting block is integrally formed at the bottom of the filter box.

[0012] The mixing box is rotatably connected to two fixed rings distributed on the left and right, the lower ends of the two fixed rings are fixedly connected to brackets, the outer wall of the mixing box is fixedly connected to a gear ring, the lower end of the gear ring is meshingly connected to a gear, one side of the gear is rotatably connected to a bracket on one side, and the other side of the gear is connected to the bracket on the other side through a second driving source. A transition inlet is provided on the left side of the mixing box, a sealing cover assembly is clamped on the right side of the mixing box, and a stirring mechanism is provided inside the mixing box.

[0013] In one possible implementation, the filtering mechanism includes two active rollers rotatably connected to the inner walls on the front and rear sides of the filter box, the two active rollers are distributed up and down, and a plurality of driven rollers are arranged between the two active rollers. The plurality of driven rollers are distributed in an S shape on the inner wall of the filter box, and the plurality of driven rollers are rotatably connected to the inner walls on the front and rear sides of the filter box, the rear sides of the two active rollers both penetrate the rear side wall of the filter box, the two active rollers are driven by a synchronous belt, one of the active rollers is fixedly connected to a first driving source, and the active roller and the driven roller are sequentially wound with a first filter net.

[0014] In one possible implementation, the first filter screen is composed of two upper and lower steel wire screens and a charcoal bag placed between the two steel wire screens, the steel wire screen includes a steel wire outer frame, a plurality of No. 1 steel wires fixedly connected to the steel wire outer frame at an upward tilt from left to right, and a plurality of No. 2 steel wires fixedly connected to the steel wire outer frame at an downward tilt from left to right, the No. 1 steel wire and the No. 2 steel wire are fixedly connected at their intersection, a buckle is fixedly connected at the intersection of the No. 1 steel wire and the No. 2 steel wire on the upper steel wire screen, and a slot corresponding to the buckle is provided at the intersection of the No. 1 steel wire and the No. 2 steel wire on the lower steel wire screen.

[0015] In one possible implementation, a sealing ring is fixedly provided on the outer side of the transition outlet, the inner diameter of the sealing ring is equal to the outer diameter of the transition inlet, limiting strip grooves are symmetrically provided on the inner ring wall of the sealing ring, an annular rotating groove is provided on the inner ring of the sealing ring and connected to the limiting strip groove, the inner diameter of the transition inlet is larger than the outer diameter of the transition outlet, and elastic blocks are symmetrically provided on the transition inlet.

[0016] In one possible implementation, the sealing cover assembly includes a sealing cover plate that is cooperatively connected to the mixing box, and the sealing cover plate is composed of two cylindrical structures with different diameters, one of which is contact-connected to the inner wall on the right side of the mixing box, and the other cylindrical structure is rotatably connected to a ring groove corresponding to the right side of the mixing box through a cylindrical ring. An outlet groove is provided near the bottom of the sealing cover plate, and a solenoid valve is correspondingly provided in the outlet groove. An electric telescopic rod is fixedly connected to the rear side of the sealing cover plate, and the electric telescopic rod is connected to the bracket on the right side through an L-shaped rod.

[0017] In one possible implementation, the stirring mechanism includes a disc-shaped support grid fixedly connected to the inner wall of the stirring box, a plurality of cylindrical rods are fixedly connected to the right side of the support grid and are evenly distributed in a circle, the right sides of the plurality of cylindrical rods are all fixedly connected to the disc, a connecting rod is fixedly connected at the center of the support grid and the center of the disc, and a plurality of stirring blades are fixedly connected to the connecting rod.

[0018] In one possible implementation, fixed pulleys are provided on the left and right sides of the outer wall of the cylindrical structure formed by the multiple cylindrical rods and the disc, a steel wire rope is wound around the fixed pulley, a second filter screen is fixedly connected to the left side of the steel wire rope, the structural composition of the second filter screen is the same as that of the first filter screen, and the external shape formed is different, the other end of the steel wire rope is wound around the rotating column, a block is provided on the left side of the rotating column and is engaged in a locking groove provided on the disc, and a turntable is rotatably connected to the left side of the rotating column, and the turntable and the locking groove are connected by a spring.

[0019] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects:

[0020] 1. According to a method for preparing and decolorizing high-concentration L-proline provided by an embodiment of the present invention, a high-concentration L-proline solution is subjected to preliminary multi-layer filtration and secondary stirring filtration by a decolorization device. The multiple filtration methods have a more obvious effect on the adsorption and decolorization of the L-proline solution, and multiple operations are not required, thereby reducing the number of steps.

[0021] 2. According to a method for preparing and decolorizing high-concentration L-proline provided by an embodiment of the present invention, a high-concentration L-proline solution is subjected to preliminary multiple carbon bag adsorption, and the carbon bag with an S-shaped distribution will contact and adsorb the high-concentration L-proline solution on both sides for multiple times for decolorization. Since the first filter screen in the filter box is in a rotating state during the filtration process, the activated carbon at the upper end is prevented from being in a saturated state of adsorption, so that the carbon bag in the first filter screen is in a uniform state as much as possible for adsorption and decolorization.

[0022] 3. According to a method for preparing and decolorizing high-concentration L-proline provided by an embodiment of the present invention, a stirring box is set up to stir the solution after preliminary filtration, adsorption and decolorization, and repeatedly contact and adsorb with the carbon bag in the second filter screen. The adsorption time with the carbon bag can be extended in the stirring box, further enhancing the adsorption and decolorization effect and improving the decolorization efficiency.

[0023] 4. According to a method for preparing and decolorizing high-concentration L-proline provided by an embodiment of the present invention, the second filter is sleeved in the stirring box and fixed with a steel wire rope, so that the carbon bag can be easily removed and replaced. The first filter and the second filter are arranged in a manner that can be directly closed and opened by pressing, so that the carbon bag can be easily replaced. The most important thing is that the carbon bag can be reasonably divided into suitable sizes to avoid accumulation of the carbon bag after being used for a period of time, which affects the subsequent adsorption and decolorization use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention provides a flowchart of a method for preparing and decolorizing high-concentration L-proline.

[0025] Figure 2 It is a schematic structural diagram of the decolorization device provided by an embodiment of the present invention from a first viewing angle (viewed from front to back).

[0026] Figure 3 It is a schematic structural diagram of the decolorization device provided by an embodiment of the present invention from a second viewing angle (viewed from the back to the front).

[0027] Figure 4 yes Figure 1 Schematic diagram of the front section.

[0028] Figure 5 It is a front cross-sectional view of the structure of the first filter screen provided by an embodiment of the present invention.

[0029] Figure 6 yes Figure 4 Enlarged view of point A in the middle.

[0030] Figure 7 It is a front cross-sectional view of the structure of a mixing box provided in an embodiment of the present invention.

[0031] Figure 8 yes Figure 7 Structural cross-section view at BB in the middle.

[0032] Fig. 9 yes Figure 7 Enlarged view of point C in the middle.

[0033] Fig.10 It is a schematic diagram of the structure of the second filter provided by an embodiment of the present invention.

[0034] In the figure: 1, filter box; 11, square cover plate; 12, transition outlet; 121, tilting block; 13, sealing ring; 131, limit strip groove; 132, annular rotating groove; 2, mixing box; 21, fixing ring; 22, gear ring; 23, gear; 24, transition inlet; 241, elastic block; 25, sealing cover assembly; 251, sealing cover plate; 252, cylindrical ring; 253, outlet groove; 254, electric telescopic rod; 255, L-shaped rod; 26, mixing mechanism; 261, supporting grid; 262, cylindrical rod; 263, Disc; 2631, locking groove; 264, connecting rod; 265, stirring blade; 266, fixed pulley; 267, wire rope; 268, second filter screen; 269, rotating column; 2691, block; 270, turntable; 271, spring; 27, ring groove; 3, filtering mechanism; 31, active roller; 32, driven roller; 33, first filter screen; 331, wire mesh; 3311, steel wire frame; 3312, No. 1 steel wire; 3313, No. 2 steel wire; 3314, buckle; 3315, slot; 332, charcoal bag. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] See also Figure 1 , Figure 2 and Figure 3 A method for preparing and decolorizing high-concentration L-proline, the method for preparing and decolorizing high-concentration L-proline specifically comprises the following steps:

[0037] S1. Dissolution: Dissolve high concentration L-proline in an appropriate amount of solvent, usually water or an organic solvent, to ensure that the L-proline is completely dissolved.

[0038] S2, activated carbon treatment: the L-proline solution obtained by dissolving the high-concentration L-proline in S1 is poured into the filter box 1 of the decolorization treatment device for preliminary filtration. The solution after the preliminary filtration enters the stirring box 2 for secondary activated carbon filtration and is stirred at the same time, which helps the activated carbon to adsorb impurities and pigments in the solution.

[0039] S3. Filtration: Filter the solution containing activated carbon after treatment in S2 through filter paper or other appropriate filter materials to remove impurities and activated carbon particles.

[0040] S4, deep adsorption: The L-proline solution decolorized by S3 is deeply adsorbed by other adsorption materials to improve the decolorization effect and purity.

[0041] S5. Recrystallization: By controlling the temperature or the volatilization of the solvent, L-proline is promoted to recrystallize, thereby further improving its purity.

[0042] See also Figure 2 , Figure 3 and Figure 4 The decolorization device involved in the above step S2 includes a filter box 1 fixedly connected by a support frame and a stirring box 2 rotatably connected to the filter box 1; wherein, a square cover plate 11 with a feed port is inserted at the upper end of the filter box 1, and the square cover plate 11 can be taken out from the upper end of the filter box 1, so as to facilitate the replacement of the first filter screen 33 inside. A filter mechanism 3 is arranged inside the filter box 1, and a transition outlet 12 is provided on the side of the filter box 1 near the bottom, and a tilting block 121 is integrally formed at the bottom of the filter box 1; the design of the tilting block 121 The arrangement facilitates the L-proline solution to flow toward the transition outlet 12, the stirring box 2 is rotatably connected in two fixed rings 21 distributed on the left and right, the lower ends of the two fixed rings 21 are fixedly connected to brackets, the outer wall of the stirring box 2 is fixedly connected to a gear ring 22, the lower end of the gear ring 22 is meshingly connected to a gear 23, one side of the gear 23 is rotatably connected to a bracket on one side, and the other side of the gear 23 is connected to the bracket on the other side through a second driving source, a transition inlet 24 is provided on the left side of the stirring box 2, a sealing cover assembly 25 is clamped on the right side of the stirring box 2, and a stirring mechanism 26 is provided inside the stirring box 2.

[0043] During operation, the dissolved L-proline solution is poured into the filter box 1 from the feed port of the square cover plate 11, and is preliminarily filtered through the filter mechanism 3 in the filter box 1. The preliminarily filtered L-proline solution will flow into the mixing box 2. Starting the second driving source will drive the gear 23 to rotate, and the gear 23 will drive the gear ring 22 to rotate, thereby driving the mixing box 2 to rotate. At this time, the sealing cover assembly 25 is in a sealed state, and the mixing box 2 rotates between the transition outlet 12 and the sealing cover assembly 25.

[0044] See also Figure 3 and Figure 4 The filtering mechanism 3 includes two active rollers 31 rotatably connected to the inner walls of the front and rear sides of the filter box 1, the two active rollers 31 are distributed up and down, and a plurality of driven rollers 32 are arranged between the two active rollers 31. The plurality of driven rollers 32 are distributed in an S shape on the inner wall of the filter box 1, and the plurality of driven rollers 32 are rotatably connected to the inner walls of the front and rear sides of the filter box 1. The rear sides of the two active rollers 31 penetrate the rear side wall of the filter box 1. The two active rollers 31 are driven by a synchronous belt, one of the active rollers 31 is fixedly connected to a first driving source, and the active roller 31 and the driven roller 32 are sequentially wound with a first filter screen 33.

[0045] When working, starting the first driving source will drive one of the active rollers 31 to rotate, and the two active rollers 31 will rotate simultaneously under the synchronous belt drive. Here, it is explained that the two active rollers 31 and the filter box 1 are both provided with sealing rubber rings at the penetration points, and the first filter screen 33 passes by the active roller 31 and the multiple driven rollers 32 in turn (such as Figure 4 As shown in the figure, the first filter screen 33 is S-shaped on the multiple driven rollers 32, and under the rotation of the upper and lower active rollers 31, the first filter screen 33 will rotate, and the first filter screen 33 will rotate in contact with the inner wall of the filter box 1. The first filter screen 33 is turned over and driven in sequence under the action of the multiple driven rollers 32, and both sides will filter the incoming L-proline solution upward in sequence, thereby improving the filtering effect of the first filter screen 33 and improving the utilization rate of the first filter screen 33.

[0046] See also Figure 5 The first filter screen 33 is composed of two upper and lower steel wire screens 331 and a carbon bag 332 placed between the two steel wire screens 331. The steel wire screen 331 includes a steel wire outer frame 3311, a plurality of No. 1 steel wires 3312 fixedly connected to the steel wire outer frame 3311 at an upward tilt from left to right, and a plurality of No. 2 steel wires 3313 fixedly connected to the steel wire outer frame 3311 at an downward tilt from left to right. The No. 1 steel wire 3312 and the No. 2 steel wire 3313 are fixedly connected at their intersections, a buckle 3314 is fixedly connected at the intersection of the No. 1 steel wire 3312 and the No. 2 steel wire 3313 on the upper steel wire screen 331, and a slot 3315 corresponding to the buckle 3314 is provided at the intersection of the No. 1 steel wire 3312 and the No. 2 steel wire 3313 on the lower steel wire screen 331.

[0047] The working principle of the first filter screen 33 is that the charcoal bag 332 is fixed by the upper and lower steel wire meshes 331, and the No. 1 steel wire 3312 and the No. 2 steel wire 3313 form multiple diamond structures, and the No. 1 steel wire 3312, the No. 2 steel wire 3313 and the steel wire outer frame 3311 form a polygonal structure at the border. Here, the steel wire outer frame 3311 is a rectangular structure. The diamond structure and the polygonal structure press the charcoal bag 332 into corresponding structures, and the upper steel wire mesh 331 and the lower steel wire mesh 331 can be detachably merged and split under the action of the buckle 3314 and the slot 3315.

[0048] See also Figure 4 and Figure 6 A sealing ring 13 is fixedly arranged on the outer side of the transition outlet 12, and the inner diameter of the sealing ring 13 is equal to the outer diameter of the transition inlet 24. A limiting strip groove 131 is symmetrically arranged on the inner ring wall of the sealing ring 13, and an annular rotating groove 132 is arranged on the inner ring wall of the sealing ring 13 and connected to the limiting strip groove 131. The inner diameter of the transition inlet 24 is larger than the outer diameter of the transition outlet 12, and elastic blocks 241 are symmetrically arranged on the transition inlet 24.

[0049] During operation, the transition outlet 12 is inserted into the transition inlet 24 accordingly. First, the elastic block 241 on the corresponding transition inlet 24 is aligned with the position of the limiting strip groove 131 for plugging. The elastic block 241 will be pressed to a certain extent under the action of the limiting strip groove 131 until it enters the annular rotating groove 132. The elastic block 241 can rotate in the annular rotating groove 132 accordingly. It should be noted here that sealing rubber rings are provided at the connection between the inner and outer walls of the transition inlet 24 and the transition outlet 12 and the sealing ring 13 respectively to ensure the sealing of the connection.

[0050] See also Figure 1 and Figure 4 The sealing cover assembly 25 includes a sealing cover plate 251 which is matched and connected to the mixing box 2. The sealing cover plate 251 is composed of two cylindrical structures with different diameters, one of which is correspondingly contacted and connected to the inner wall of the right side of the mixing box 2, and the other cylindrical structure is rotatably connected to the ring groove 27 correspondingly opened on the right side of the mixing box 2 through a cylindrical ring 252. The sealing cover plate 251 is provided with an outlet groove 253 near the bottom, and a solenoid valve is correspondingly arranged in the outlet groove 253. The rear side of the sealing cover plate 251 is fixedly connected with an electric telescopic rod 254, and the electric telescopic rod 254 is connected to the bracket on the right side through an L-shaped rod 255.

[0051] During operation, when the stirring box 2 rotates and stirs, the sealing cover 251 rotates and abuts against the right side of the stirring box 2 under the action of the electric telescopic rod 254, and the cylindrical ring 252 rotates correspondingly in the ring groove 27. It should be noted here that a sealing rubber ring is provided at the contact point between the cylindrical structure of the sealing cover 251 and the stirring box 2. When the stirring box 2 rotates, the solenoid valve is in a closed state until the stirring and adsorption operation is completed, and then the solenoid valve is opened to allow the adsorbed and decolorized solution after stirring to flow out.

[0052] See also Figure 7 , Figure 8 , Fig. 9 and Fig.10 The stirring mechanism 26 includes a circular support grid 261 fixedly connected to the inner wall of the stirring box 2, and a plurality of cylindrical rods 262 are evenly distributed and fixedly connected to the right side of the support grid 261 in a circumferential manner, and the right sides of the plurality of cylindrical rods 262 are fixedly connected to the disc 263, and a connecting rod 264 is fixedly connected at the center of the support grid 261 and the center of the disc 263, and a plurality of stirring blades 265 are fixedly connected to the connecting rod 264; when the stirring box 2 rotates, the structure in the stirring box 2 will rotate synchronously, and the stirring blades 265 will drive the solution after preliminary filtration to stir, increase the probability of repeated contact with the second filter screen 268, and improve the filtering effect, and the cylindrical structure formed by the plurality of cylindrical rods 262 and the disc 263 on the left side of the outer wall A fixed pulley 266 is provided on the right side, and a steel wire rope 267 is wound around the fixed pulley 266. A second filter screen 268 is fixedly connected to the left side of the steel wire rope 267. The structural composition of the second filter screen 268 is the same as the structural composition of the first filter screen 33, but the external shape formed is different (it is also composed of a steel wire mesh 331 and a charcoal bag 332 placed between the two steel wire meshes 331. The difference is that the steel wire outer frame 331 here is a cylindrical structure). The other end of the steel wire rope 267 is wound around the rotating column 269. A clamping block 2691 is provided on the left side of the rotating column 269 and is clamped in a locking groove 2631 provided on the disc 263. A turntable 270 is rotatably connected to the left side of the rotating column 269, and the turntable 270 is connected to the locking groove 2631 by a spring 271.

[0053] When doing specific work, such as Fig.10As shown, the second filter screen 268 is a cylindrical structure with an opening on the left side, and a through hole is correspondingly provided on the right side. The wire rope 267 fixedly connected to the left side of the second filter screen 268 passes through the fixed pulleys 266 on the left and right sides in turn, and is wound around the rotating column 269 for fixing. At this time, the second filter screen 268 will be surrounded by the outer side of the multiple cylindrical rods 262. Under the action of the spring 271, the block 2691 on the rotating column 269 is correspondingly connected to the locking groove 2631 for fixing. When the second filter screen 268 needs to be replaced, the rotating column 269 is pulled out and the rotating column 269 is fixed. When the stop block 2691 is lost, the rotating disk 270 will rotate, and the second filter 268 can be pulled out from the cylindrical rod 262. Since the second filter 268 has the same structure as the first filter 33, after replacing the internal carbon bag 332, the steel wire rope 267 will be driven to be wound around the rotating column 269 again through the rotating column 269 on the right side of the second filter 268, until the right side of the second filter 268 is close to the disk 263, and the rotating column 269 is again engaged in the locking groove 2631 for limit fixing.

[0054] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for preparing and decolorizing high-concentration L-proline, characterized in that: The high-concentration L-proline preparation and decolorization method specifically comprises the following steps: S1. Dissolution: Dissolve high concentration L-proline in an appropriate amount of solvent, select water or organic solvent, and ensure that L-proline is completely dissolved; S2, activated carbon treatment: the L-proline solution after the high concentration of L-proline in S1 is dissolved is poured into the filter box (1) of the decolorization treatment device for preliminary filtration. The solution after the preliminary filtration is then sent to the stirring box (2) for secondary activated carbon filtration and stirred at the same time, which helps the activated carbon to adsorb impurities and pigments in the solution; S3, filtration: filtering the solution containing activated carbon after treatment in S2 through filter paper or other appropriate filter material to remove impurities and activated carbon particles; S4, deep adsorption: The L-proline solution decolorized by S3 is deeply adsorbed by other adsorption materials to improve the decolorization effect and purity; S5. Recrystallization: by controlling the temperature or the volatilization of the solvent, the L-proline is promoted to recrystallize, thereby further improving its purity; The decolorization device involved in the above step S2 comprises a filter box (1) fixedly connected via a support frame and a stirring box (2) rotatably connected to the filter box (1); wherein a square cover plate (11) with a feed inlet is inserted at the upper end of the filter box (1), a filter mechanism (3) is arranged inside the filter box (1), a transition outlet (12) is provided on the side of the filter box (1) near the bottom, and a tilting block (121) is integrally formed at the bottom of the filter box (1); The mixing box (2) is rotatably connected to two fixed rings (21) distributed on the left and right, the lower ends of the two fixed rings (21) are fixedly connected to brackets, the outer wall of the mixing box (2) is fixedly connected to a gear ring (22), the lower end of the gear ring (22) is meshingly connected to a gear (23), one side of the gear (23) is rotatably connected to a bracket on one side, and the other side of the gear (23) is connected to a bracket on the other side through a second driving source, a transition inlet (24) is provided on the left side of the mixing box (2), a sealing cover assembly (25) is clamped on the right side of the mixing box (2), and a mixing mechanism (26) is provided inside the mixing box (2); The filtering mechanism (3) comprises two active rollers (31) rotatably connected to the inner walls of the front and rear sides of the filter box (1); the two active rollers (31) are distributed up and down; a plurality of driven rollers (32) are arranged between the two active rollers (31); the plurality of driven rollers (32) are distributed in an S-shape on the inner wall of the filter box (1); and the plurality of driven rollers (32) are rotatably connected to the inner walls of the front and rear sides of the filter box (1); the rear sides of the two active rollers (31) penetrate the rear side wall of the filter box (1); the two active rollers (31) are driven by a synchronous belt; a first driving source is fixedly connected to one of the active rollers (31); and a first filter screen (33) is sequentially wound around the active roller (31) and the driven roller (32).

2. A method for preparing and decolorizing high-concentration L-proline according to claim 1, characterized in that: The first filter screen (33) is composed of two upper and lower steel wire screens (331) and a carbon bag (332) placed between the two steel wire screens (331), the steel wire screen (331) comprising a steel wire outer frame (3311), a plurality of No. 1 steel wires (3312) fixedly connected to the steel wire outer frame (3311) at an upward tilt from left to right, and a plurality of No. 2 steel wires (3313) fixedly connected to the steel wire outer frame (3311) at an downward tilt from left to right. ), the intersection of the No. 1 steel wire (3312) and the No. 2 steel wire (3313) is fixedly connected, the intersection of the No. 1 steel wire (3312) and the No. 2 steel wire (3313) on the upper steel wire mesh (331) is fixedly connected with a buckle (3314), and the intersection of the No. 1 steel wire (3312) and the No. 2 steel wire (3313) on the lower steel wire mesh (331) is provided with a clamping groove (3315) corresponding to the buckle (3314).

3. A method for preparing and decolorizing high-concentration L-proline according to claim 1, characterized in that: A sealing ring (13) is fixedly arranged on the outer side of the transition outlet (12); the inner diameter of the sealing ring (13) is equal to the outer diameter of the transition inlet (24); a limiting strip groove (131) is symmetrically arranged on the inner ring wall of the sealing ring (13); an annular rotating groove (132) is arranged on the inner ring of the sealing ring (13) and is connected to the limiting strip groove (131); the inner diameter of the transition inlet (24) is greater than the outer diameter of the transition outlet (12); and elastic clamping blocks (241) are symmetrically arranged on the transition inlet (24).

4. A method for preparing and decolorizing high-concentration L-proline according to claim 1, characterized in that: The sealing cover assembly (25) comprises a sealing cover plate (251) which is matched and connected in the mixing box (2). The sealing cover plate (251) is composed of two cylindrical structures with different diameters, one of which is contact-connected to the inner wall on the right side of the mixing box (2) and the other is rotatably connected to a corresponding annular groove (27) on the right side of the mixing box (2) via a cylindrical ring (252). An outlet groove (253) is provided near the bottom of the sealing cover plate (251), and a solenoid valve is correspondingly provided in the outlet groove (253). An electric telescopic rod (254) is fixedly connected to the rear side of the sealing cover plate (251), and the electric telescopic rod (254) is connected to the bracket on the right side via an L-shaped rod (255).

5. A method for preparing and decolorizing high-concentration L-proline according to claim 1, characterized in that: The stirring mechanism (26) comprises a disc-shaped supporting grid (261) fixedly connected to the inner wall of the stirring box (2); a plurality of cylindrical rods (262) are evenly distributed and fixedly connected to the right side of the supporting grid (261); the right sides of the plurality of cylindrical rods (262) are all fixedly connected to the disc (263); a connecting rod (264) is fixedly connected at the center of the supporting grid (261) and the center of the disc (263); and a plurality of stirring blades (265) are fixedly connected to the connecting rod (264).

6. A method for preparing and decolorizing high-concentration L-proline according to claim 5, characterized in that: Fixed pulleys (266) are provided on the left and right sides of the outer wall of the cylindrical structure formed by the plurality of cylindrical rods (262) and the disk (263). A steel wire rope (267) is wound around the fixed pulley (266). A second filter screen (268) is fixedly connected to the left side of the steel wire rope (267). The structural composition of the second filter screen (268) is the same as that of the first filter screen (33), but the external shape formed is different. The other end of the steel wire rope (267) is wound around a rotating column (269). A clamping block (2691) is provided on the left side of the rotating column (269) and is clamped in a locking groove (2631) provided on the disk (263). A rotating disk (270) is rotatably connected to the left side of the rotating column (269). The rotating disk (270) and the locking groove (2631) are connected by a spring (271).

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