Glycine purifying and desalting device and desalting method

Abstract

The invention relates to the technical field of glycine purification and desalination production, in particular to a glycine purification and desalination device and a desalination method.The glycine purification and desalination device comprises a supporting frame, a dissolving and washing tank is fixedly arranged on the supporting frame, and a discharging assembly is arranged on the dissolving and washing tank and comprises a rotating part; when the rotating piece acts, the feeding pipe on the dissolving and washing tank can be driven to intermittently feed materials into the dissolving and washing tank; the dissolving and washing tank is further provided with a stirring assembly, the stirring assembly comprises a stirring piece arranged in the dissolving and washing tank, the stirring piece is connected with a rotating piece through a lifting assembly, in the action process of the rotating piece, the lifting assembly can be driven to act, and then the stirring piece is driven to ascend in the axial direction of the dissolving and washing tank; therefore, the solution in the dissolving and washing tank is stirred and mixed. Through cooperation of all the components, the dissolving speed of solids in the mother liquor is increased, and therefore the purity of glycine is improved.

Description

Technical Field

[0001] The invention relates to the technical field of glycine purification and desalination production, in particular to a glycine purification and desalination device and a desalination method. Background Art

[0002] Glycine, also known as aminoacetic acid, is a non-essential amino acid for the human body. At the same time, according to the different synthesis processes and product quality of glycine, it is widely used in food, medicine, agriculture, industry and other fields. At present, the domestic method for producing glycine is mainly based on the chloroacetic acid ammonolysis method. The advantages of this method are that the source of reaction raw materials is wide, the synthesis temperature and pressure are mild, the synthesis operation method is simple, and it is easy to industrialize production. The disadvantage is that the glycine product produced by this method is of poor quality, and the by-product ammonium chloride is difficult to separate from the main product glycine.

[0003] At present, after the synthesis of glycine by the ammonolysis of chloroacetic acid, a certain proportion of methanol is added dropwise to separate the glycine, and the separated solid-liquid mixture is separated by a centrifuge. The separated solid glycine contains a certain amount of ammonium chloride and urotropine, which reduces the purity of the glycine and requires further refining. The centrifuged mother liquor after separation is directly sent to a methanol distillation system to recover methanol, and the distillation bottom liquid without recovering ammonium chloride is sent to wastewater treatment. Therefore, a large amount of wastewater with high salt content and high COD is generated, which is difficult to treat, causing environmental pollution and increasing the production cost of glycine. In addition, in the above solid-liquid mixing process, conventional stirring and mixing is not enough to fully mix the solid mixture with the liquid, which will lead to a reduction in the final purification efficiency. Summary of the invention

[0004] The object of the present invention is to provide a glycine purification and desalination device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A glycine purification and desalination device, comprising:

[0007] A support frame, on which a washing tank is fixedly arranged, on which a material discharge assembly is arranged, wherein the material discharge assembly comprises a rotating member, and when the rotating member moves, the material discharge assembly can drive a feeding pipe on the washing tank to discharge materials intermittently into the washing tank;

[0008] The dissolving and washing tank is also provided with a stirring assembly, which includes a stirring piece arranged in the dissolving and washing tank, and the stirring piece is connected to the rotating piece through a lifting assembly. During the movement of the rotating piece, the lifting assembly can be driven to move, and then the stirring piece is driven to rise along the axial direction of the dissolving and washing tank, so as to stir and mix the solution in the dissolving and washing tank.

[0009] The glycine purification and desalination device as described above: the rotating part comprises a turntable rotatably installed in the dissolving and washing tank, the turntable is provided with a through slot, and the through slot cooperates with the feed pipe to open the feed pipe.

[0010] The glycine purification and desalination device as described above: the feed assembly also includes a driving gear rotatably mounted on the dissolving and washing tank and fixedly arranged coaxially with the turntable, and the driving gear is connected to the output shaft of the motor fixedly mounted on the dissolving and washing tank through a belt.

[0011] The glycine purification and desalination device as described above: the stirring element includes a lifting sleeve, and the lifting sleeve is fixedly provided with at least one set of stirring blades equidistantly in opposite directions along its circumference, and the lifting sleeve is slidably connected to a rotating rod rotatably installed in the dissolving and washing tank.

[0012] The glycine purification and desalination device as described above: the lifting assembly includes a trigger structure and a driving structure, the trigger structure includes a driven gear rotatably mounted on the dissolving and washing tank, the driven gear cooperates with the driving gear, and a worm is coaxially fixed on the driven gear, and the worm is meshed with a worm wheel rotatably mounted on the dissolving and washing tank.

[0013] The glycine purification and desalination device as described above: the driving structure includes a driving rod rotatably mounted on the dissolving and washing tank, the driving rod is connected to a linkage wheel rotatably mounted on the dissolving and washing tank via a linkage belt, and the linkage wheel is connected to the worm gear via a bevel gear set, a sleeve is also sleeved on the driving rod, a protrusion is formed on the inner wall of the sleeve, the protrusion is slidably arranged in a spiral groove opened on the outer wall of the driving rod, and the sleeve is connected to the lifting sleeve via a connecting piece.

[0014] The glycine purification and desalination device as described above: the connecting member includes a connecting rod fixedly connected to the sleeve, the connecting rod is connected to a sliding rod slidably arranged on the washing tank through a connecting plate, and the end of the sliding rod away from the connecting plate is rotatably connected to the lifting sleeve.

[0015] A method for purifying and desalting glycine is also proposed, comprising the following steps:

[0016] Dissolving and washing: sending the mother liquor in the glycine mother liquor tank and the mother liquor in the ammonium chloride mother liquor tank to the glycine purification and desalination device as described above, respectively, and then adding solid glycine and solid ammonium chloride to the dissolving and washing tanks for dissolving and refining;

[0017] Centrifugation: The mixed solid-liquid mixture is sent to a centrifuge for solid-liquid separation. The separated solid is sent to a drying device for drying and packaging. The centrifuged mother liquor is sent to a mother liquor tank. After repeated dissolution until the ammonium chloride content in the glycine mother liquor reaches 10-18% and the glycine content in the ammonium chloride mother liquor reaches 10-20%, the glycine mother liquor and the ammonium chloride mother liquor are sent to the mixed mother liquor tank through a delivery pump;

[0018] Electrodialysis: The mixed mother liquor is sent to the electrodialysis device to separate glycine and ammonium chloride;

[0019] Evaporation: The separated ammonium chloride concentrated liquid is evaporated and concentrated by using an evaporation device, and the evaporated concentrated circulating liquid is sent to an ammonium chloride dissolving and washing device for circulating dissolving and washing ammonium chloride;

[0020] Decolorization: The mother liquor in the glycine concentrate tank is filtered and absorbed by a resin decolorization device to remove hexamethylenetetramine and other impurities in the glycine concentrate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] By setting a feeding assembly and utilizing the cooperation between the turntable and the feeding pipe, the feeding pipe can intermittently feed the material into the dissolving and washing tank, and when the feeding pipe is feeding, the mother liquid tank can just transport the heated mother liquid into the dissolving and washing tank;

[0023] At the same time, by setting up a stirring component and utilizing the cooperation between the stirring component and the lifting component, during the process of the feeding pipe feeding into the dissolving and washing tank, the lifting component can drive the stirring element to rise a certain distance. When the feeding pipe stops feeding, the stirring element is in a suspended state. At this time, the stirring element in the suspended state is located in the middle section of the height of the solution in the dissolving and washing tank, so that the stirring element can stir and mix the new and old solutions, thereby increasing the dissolution rate of the solid matter, thereby improving the purity and quality of glycine and reducing the production cost of glycine. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Flow chart of the desalting method for glycine purification.

[0025] Figure 2 Schematic diagram of the structure of the glycine purification and desalination device.

[0026] Figure 3 This is a schematic diagram of the structure on the other side of the glycine purification and desalination device.

[0027] Figure 4 This is a structural schematic diagram of the cross-sectional view of the washing tank in the glycine purification and desalination device.

[0028] Figure 5 This is a schematic diagram of the internal structure of the washing tank in the glycine purification and desalination device.

[0029] Figure 6 This is a schematic diagram of the structure of the feeding component in the glycine purification and desalination device.

[0030] Figure 7 This is a schematic diagram of the structure of the stirring component in the glycine purification and desalination device.

[0031] Figure 8 Schematic diagram of the trigger structure in the glycine purification and desalting device.

[0032] Fig. 9 Schematic diagram of the driving structure in the glycine purification and desalination device.

[0033] In the figure: 1. support frame; 2. washing tank; 201. upper cover; 202. feed pipe; 3. mounting frame; 4. driving rod; 401. spiral groove; 5. sleeve tube; 501. protrusion; 6. connecting rod; 601. connecting plate; 7. bevel gear set; 8. driving gear; 9. driven gear; 10. worm gear; 11. worm; 12. rotating rod; 1201. protrusion; 13. lifting sleeve; 1301. stirring blade; 1302. groove; 14. sliding rod; 15. turntable; 1501. through groove; 16. linkage wheel. DETAILED DESCRIPTION

[0034] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0035] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0036] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0037] In an embodiment of the present invention, a method for purifying and desalting glycine comprises the following steps:

[0038] Dissolution and washing: the mother liquor in the glycine mother liquor tank and the mother liquor in the ammonium chloride mother liquor tank are respectively sent to the glycine purification and desalination device as described above, and then solid glycine and solid ammonium chloride are respectively added to the dissolution and washing tank 2 for dissolution and purification;

[0039] Centrifugation: The mixed solid-liquid mixture is sent to a centrifuge for solid-liquid separation. The separated solid is sent to a drying device for drying and packaging. The centrifuged mother liquor is sent to a mother liquor tank. After repeated dissolution until the ammonium chloride content in the glycine mother liquor reaches 10-18% and the glycine content in the ammonium chloride mother liquor reaches 10-20%, the glycine mother liquor and the ammonium chloride mother liquor are sent to the mixed mother liquor tank through a delivery pump;

[0040] Electrodialysis: The mixed mother liquor is sent to the electrodialysis device to separate glycine and ammonium chloride;

[0041] Evaporation: The separated ammonium chloride concentrated liquid is evaporated and concentrated by using an evaporation device, and the evaporated concentrated circulating liquid is sent to an ammonium chloride dissolving and washing device for circulating dissolving and washing ammonium chloride;

[0042] Decolorization: The mother liquor in the glycine concentrate tank is filtered and absorbed by a resin decolorization device to remove hexamethylenetetramine and other impurities in the glycine concentrate.

[0043] Specifically, an improved glycine purification and desalination method requires the use of a glycine dissolving and washing centrifuge, an ammonium chloride dissolving and washing centrifuge, an evaporation device, and a resin decolorization and filtering device during operation. In actual operation, solid glycine and solid ammonium chloride need to be sent to the dissolving and washing tank 2 for dissolution and refining, respectively, and the dissolved solid-liquid mixture is sent to the glycine centrifuge and the ammonium chloride centrifuge for solid-liquid separation, respectively. The separated solid glycine and solid ammonium chloride are sent to the drying system for drying and packaging, and the glycine centrifuge mother liquor and the ammonium chloride centrifuge mother liquor are sent to the glycine mother liquor tank and the ammonium chloride mother liquor tank, respectively. When the ammonium chloride content in the glycine dissolving and washing device reaches 10-18% and the glycine content in the ammonium chloride dissolving and washing device reaches 10-20%, the glycine mother liquor and the ammonium chloride mother liquor are sent to the mixed mother liquor tank;

[0044] After the mixed mother liquor in the mixed mother liquor tank is fully mixed, the mixed mother liquor is sent to the electrodialysis device through a delivery pump to separate glycine and ammonium chloride. The fresh water separated by the electrodialysis device is sent to the glycine concentrate tank, and the concentrated water after separation is sent to the ammonium chloride concentrate tank for storage.

[0045] Subsequently, the mother liquor in the glycine concentrate tank is sent to the resin decolorization device through a delivery pump for filtration and absorption to remove urotropine and other impurities in the glycine concentrate; the decolorized glycine concentrated mother liquor is sent to the glycine dissolving and washing device (glycine dissolving and washing tank 2) for circulating and refining glycine.

[0046] The mother liquor in the ammonium chloride concentrate tank is sent to the evaporation device through a delivery pump for evaporation and concentration; the evaporation and concentration circulating liquid is sent to the ammonium chloride dissolving and washing device (ammonium chloride dissolving and washing tank 2) for circulating dissolving and washing ammonium chloride; the evaporated condensate is sent to the electrodialysis device for recycling.

[0047] Compared with the chloroacetic acid ammonolysis synthesis method, the above method can further recycle the glycine in the wastewater and improve the synthesis yield of glycine. At the same time, the ammonium chloride in the wastewater is converted into high-quality ammonium chloride for sale through the above device, so as to reduce the production cost of glycine and greatly reduce the discharge of wastewater.

[0048] In detail, the present invention makes improvements on the dissolution and washing process to improve the dissolution effect of solids, thereby improving the purity of glycine;

[0049] See also Figure 2-Figure 9 , a glycine purification and desalination device, comprising:

[0050] A support frame 1, on which a washing tank 2 is fixedly arranged, and on which a material discharge assembly is arranged, wherein the material discharge assembly comprises a rotating member, and when the rotating member moves, the material discharge assembly can drive a feed pipe 202 on the washing tank 2 to discharge materials intermittently into the washing tank 2;

[0051] Specifically, the dissolving and washing tank 2 in the present invention is used to dissolve a mixture of glycine mother liquor (or ammonium chloride mother liquor) and solid glycine (or solid ammonium chloride) (hereinafter explained as the dissolving and washing tank 2 of glycine), and the above-mentioned dissolving and washing tank 2 is connected to a mother liquor tank arranged outside the dissolving and washing tank 2 (not shown in the figure), and the feeding pipe 202 is connected to an external container containing solid glycine. When the feeding pipe 202 is opened, the feeding pipe 202 can discharge material into the dissolving and washing tank 2 in a quantitative manner. When the glycine is purified and desalted, according to the overall purification process, the mother liquor tank can quantitatively transport the glycine mother liquor into the dissolving and washing tank 2. At the same time, the feeding component can drive the feeding pipe 202 to add solid glycine into the dissolving and washing tank 2 according to a proportion. The solid-liquid mixture after the solid glycine is dissolved is sent to the glycine centrifuge for solid-liquid separation for subsequent purification operations.

[0052] The rotating member includes a rotating disc 15 rotatably mounted in the washing tank 2, and a through slot 1501 is provided on the rotating disc 15. The through slot 1501 cooperates with the feed pipe 202 to open the feed pipe 202.

[0053] The unloading assembly further includes a driving gear 8 rotatably mounted on the washing tank 2 and coaxially fixedly arranged with the turntable 15, wherein the driving gear 8 is connected to an output shaft of a motor fixedly mounted on the washing tank 2 via a belt;

[0054] Preferably, see Figure 2 , Figure 3 , Figure 4 , Figure 5A mounting frame 3 is fixedly provided on the upper cover 201 of the above-mentioned washing tank 2, and a motor is fixedly installed on the mounting frame 3. The output shaft of the motor is connected to the driving gear 8. After starting the motor, the output shaft of the motor can drive the driving gear 8 to rotate continuously in the same direction. During the rotation process, the through groove 1501 intermittently cooperates with the feeding pipe 202, so as to achieve the purpose of intermittent feeding into the washing tank 2.

[0055] In the initial state, the through groove 1501 has no overlapping part with the feed pipe 202, and the feed pipe 202 is in a closed state at this time. In the above-mentioned glycine purification process, the glycine mother liquor tank can transport the mother liquor to the dissolving and washing tank 2 in a regular and quantitative manner. Correspondingly, when the through groove 1501 cooperates with the feed pipe 202 and the feed pipe 202 is turned on, the mother liquor tank can just transport the mother liquor to the dissolving and washing tank 2. When the mother liquor tank stops transporting, the turntable 15 can just block the feed pipe 202, thereby realizing an equal ratio mixing between the mother liquor and the solid glycine.

[0056] For further information, see Figure 4 , Figure 5 , Figure 6 , Figure 7 The washing tank 2 is also provided with a stirring assembly, which includes a stirring member arranged in the washing tank 2, and the stirring member is connected to the rotating member through a lifting assembly. During the movement of the rotating member, the lifting assembly can be driven to move, thereby driving the stirring member to rise along the axial direction of the washing tank 2, thereby stirring and mixing the solution in the washing tank 2;

[0057] The stirring member comprises a lifting sleeve 13, on which at least one set of stirring blades 1301 are fixedly arranged at equal intervals in opposite directions along its circumference, and the lifting sleeve 13 is slidably connected to a rotating rod 12 rotatably mounted in the washing tank 2;

[0058] Preferably, see Figure 4 , Figure 5 , Figure 6 The rotating rod 12 is coaxially arranged with the rotating disk 15 and the upper cover 201, and the rotating rod 12 is fixedly provided with two groups of protruding posts 1201 equidistantly along its circumferential direction, and the inner wall of the lifting sleeve 13 is provided with grooves 1302 adapted to the protruding posts 1201. Under the cooperation between the protruding posts 1201 and the grooves 1302, the lifting sleeve 13 can only slide along the axial direction of the rotating rod 12;

[0059] The above-mentioned stirring blades 1301 are arranged in three groups equidistantly along the circumferential direction of the lifting sleeve 13. The rotating rod 12 is coaxially fixedly connected to the output shaft of the driving motor fixedly arranged at the bottom of the dissolving and washing tank 2. When the driving motor is working, it can drive the rotating rod 12 to rotate continuously in the same direction. Then, the lifting sleeve 13 rotates synchronously with the rotating rod 12, and can stir and mix the solid glycine and the glycine mother liquor in the dissolving and washing tank 2, thereby accelerating the dissolution rate of the solid glycine, further purifying the glycine, and removing impurities and by-products therein.

[0060] For further information, see Figure 2-Figure 9 The lifting assembly includes a trigger structure and a driving structure. The trigger structure includes a driven gear 9 rotatably mounted on the washing tank 2. The driven gear 9 cooperates with the driving gear 8. A worm 11 is coaxially fixed on the driven gear 9. The worm 11 meshes with a worm wheel 10 rotatably mounted on the washing tank 2.

[0061] Preferably, see Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 The driving gear 8 is an incomplete gear. In combination with the above, when the motor drives the driving gear 8 to rotate, the driving motor also drives the rotating rod 12 to rotate. When the through slot 1501 cooperates with the feeding pipe 202, the feeding pipe 202 is opened. The toothed portion of the driving gear 8 meshes with the driven gear 9, which can drive the driven gear 9 to rotate. Then the rotating driven gear 9 can drive the driving structure to move, and then drive the lifting sleeve 13 to rise a certain distance until the toothed portion of the driving gear 8 is separated from the driven gear 9. The position of the lifting sleeve 13 is suspended. At this time, the lifting sleeve 13 is located in the middle of the solution height in the washing tank 2. When the driving gear 8 rotates, the solution height in the washing tank 2 will not change. The rotating rod 12 can drive the lifting sleeve 13 to rotate, so that the newly added liquid in the washing tank 2 can be mixed with the previously existing liquid.

[0062] The driving structure includes a driving rod 4 rotatably mounted on the washing tank 2, the driving rod 4 is connected to a linkage wheel 16 rotatably mounted on the washing tank 2 through a linkage belt, and the linkage wheel 16 is connected to the worm gear 10 through a bevel gear set 7, and a sleeve 5 is also sleeved on the driving rod 4, a protrusion 501 is formed on the inner wall of the sleeve 5, and the protrusion 501 is slidably arranged in a spiral groove 401 provided on the outer wall of the driving rod 4, and the sleeve 5 is connected to the lifting sleeve 13 through a connecting piece, and under the restriction of the connecting piece, the lifting sleeve 13 can only be lifted and lowered along the axial direction of the driving rod 4;

[0063] See also Figure 2 , Figure 3 , Figure 6 , Figure 7 , Fig. 9 The bevel gear set 7 includes a first bevel gear and a second bevel gear, wherein the first bevel gear is coaxially fixedly connected to the worm gear 10, and the second bevel gear is coaxially fixedly connected to the linkage wheel 16. In particular, the radius of the first bevel gear is a multiple of the radius of the second bevel gear, and the radius of the linkage wheel 16 is a multiple of the radius of the driving rod 4, so that the worm 11 can just drive the driving rod 4 to rotate one circle in the process of following the driven gear 9 to rotate, and in the process of the driving rod 4 rotating one circle, the contact and compression of the groove wall of the spiral groove 401 on the protrusion 501 can drive the lifting sleeve 13 to rise a certain distance in the axial direction of the driving rod 4. After the driving gear 8 and the driven gear 9 are disengaged from the meshing transmission state, due to the locking function between the worm wheel 10 and the worm 11, the position of the sleeve 5 is in a suspended state at this time;

[0064] The connecting member includes a connecting rod 6 fixedly connected to the sleeve 5, the connecting rod 6 is connected to a slide rod 14 slidably arranged on the washing tank 2 through a connecting plate 601, and one end of the slide rod 14 away from the connecting plate 601 is rotatably connected to the lifting sleeve 13;

[0065] Preferably, see Figure 4 , Figure 5 , Figure 7 In the initial state, the lifting sleeve 13 is close to the bottom of the washing tank 2. During the glycine purification process, when the driving gear 8 and the driven gear 9 enter the meshing transmission state, the worm 11 coaxially fixed with the driven gear 9 can drive the worm wheel 10 to rotate continuously in the same direction. Then, with the cooperation of the bevel gear set 7 and the linkage wheel 16, the driving rod 4 rotates clockwise (refer to Figure 7 ) one circle, driving the lifting sleeve 13 to rise a certain distance. After the driven gear 9 and the driving gear 8 are out of the transmission state, the lifting sleeve 13 maintains the current position to stir and mix the objects in the dissolving tank 2, thereby accelerating the dissolution rate of the solid glycine in the dissolving tank 2, and at the same time, the solution newly added to the dissolving tank 2 is evenly mixed with the original solution inside, thereby improving the purity and quality of glycine.

[0066] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0067] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A glycine purification and desalination device, characterized in that: include: A support frame (1), a washing tank (2) is fixedly arranged on the support frame (1), a material discharge assembly is arranged on the washing tank (2), and the material discharge assembly comprises a rotating member, and when the rotating member moves, it can drive a feeding pipe (202) on the washing tank (2) to intermittently discharge material into the washing tank (2); The washing tank (2) is also provided with a stirring assembly, which comprises a stirring member arranged in the washing tank (2), and the stirring member is connected to the rotating member via a lifting assembly. During the movement of the rotating member, the lifting assembly can be driven to move, thereby driving the stirring member to rise in the axial direction of the washing tank (2), thereby stirring and mixing the solution in the washing tank (2).

2. A glycine purification and desalination device according to claim 1, characterized in that: The rotating member comprises a rotating disc (15) rotatably mounted in the washing tank (2), the rotating disc (15) being provided with a through slot (1501), the through slot (1501) cooperating with the feed pipe (202) to open the feed pipe (202).

3. A glycine purification and desalination device according to claim 2, characterized in that: The unloading assembly also includes a driving gear (8) rotatably mounted on the washing tank (2) and coaxially fixedly arranged with the turntable (15); the driving gear (8) is connected to an output shaft of a motor fixedly mounted on the washing tank (2) via a belt.

4. A glycine purification and desalination device according to claim 3, characterized in that: The stirring member comprises a lifting sleeve (13), on which at least one set of stirring blades (1301) are fixedly arranged at equal intervals in opposite directions along its circumference, and the lifting sleeve (13) is slidably connected to a rotating rod (12) rotatably mounted in the washing tank (2).

5. A glycine purification and desalination device according to claim 4, characterized in that: The lifting assembly comprises a trigger structure and a driving structure, wherein the trigger structure comprises a driven gear (9) rotatably mounted on the washing tank (2), the driven gear (9) cooperates with the driving gear (8), and a worm (11) is coaxially fixed on the driven gear (9), and the worm (11) meshes with a worm wheel (10) rotatably mounted on the washing tank (2).

6. A glycine purification and desalination device according to claim 5, characterized in that: The driving structure comprises a driving rod (4) rotatably mounted on the washing tank (2); the driving rod (4) is connected to a linkage wheel (16) rotatably mounted on the washing tank (2) via a linkage belt, and the linkage wheel (16) is connected to the worm gear (10) via a bevel gear set (7); a sleeve (5) is also sleeved on the driving rod (4); a protrusion (501) is formed on the inner wall of the sleeve (5); the protrusion (501) is slidably arranged in a spiral groove (401) provided on the outer wall of the driving rod (4); and the sleeve (5) is connected to the lifting sleeve (13) via a connecting piece.

7. A glycine purification and desalination device according to claim 6, characterized in that: The connecting member comprises a connecting rod (6) fixedly connected to the sleeve (5); the connecting rod (6) is connected to a sliding rod (14) slidably arranged on the washing tank (2) through a connecting plate (601); and one end of the sliding rod (14) away from the connecting plate (601) is rotatably connected to the lifting sleeve (13).

8. A method for purifying and desalting glycine, characterized in that: The steps include: Dissolving and washing: sending the mother liquor in the glycine mother liquor tank and the mother liquor in the ammonium chloride mother liquor tank to the glycine purification and desalination device according to claim 1, respectively, and then adding solid glycine and solid ammonium chloride to the dissolving and washing tank (2) for dissolving and refining; Centrifugation: The mixed solid-liquid mixture is sent to a centrifuge for solid-liquid separation. The separated solid is sent to a drying device for drying and packaging. The centrifuged mother liquor is sent to a mother liquor tank. After repeated dissolution until the ammonium chloride content in the glycine mother liquor reaches 10-18% and the glycine content in the ammonium chloride mother liquor reaches 10-20%, the glycine mother liquor and the ammonium chloride mother liquor are sent to the mixed mother liquor tank through a delivery pump; Electrodialysis: The mixed mother liquor is sent to the electrodialysis device to separate glycine and ammonium chloride; Evaporation: The separated ammonium chloride concentrated liquid is evaporated and concentrated by using an evaporation device, and the evaporated concentrated circulating liquid is sent to an ammonium chloride dissolving and washing device for circulating dissolving and washing ammonium chloride; Decolorization: The mother liquor in the glycine concentrate tank is filtered and absorbed by a resin decolorization device to remove hexamethylenetetramine and other impurities in the glycine concentrate.

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