Apparatus for removing blue color from monocyannamide solution and method thereof

Abstract

This invention belongs to the field of cyanamide decolorization technology, specifically a device and method for removing the blue color from cyanamide solution. The removal method is as follows: S1: Injecting cyanamide into the packing layer; S2: Filtering the treated cyanamide by suction; S3: Eluting the packing layer: Eluent is pre-stored in the outer cylinder, and the packing particles are regenerated after elution in the eluent. This method effectively removes the blue-causing substances from cyanamide solution, keeping the solution colorless or pale yellow, with minimal impact on downstream products. The continuous bed mechanism effectively removes the blue-causing substances from cyanamide solution while ensuring product quality; it has minimal impact on downstream products, is simple to operate, and is easy to scale up for production.

Description

Technical Field

[0001] This invention relates to the field of cyanamide decolorization technology, specifically to an apparatus and method for removing the blue color from cyanamide solution. Background Technology

[0002] Aminocyanide, also known as monocyanamide, is an important intermediate in the production of dicyandiamide. Due to its highly reactive cyano and amino groups, it possesses advantages that dicyandiamide and polycyanamide lack in resin processing, pesticide, pharmaceutical, and chemical intermediate preparation. Aminocyanide aqueous solutions also have special effects such as terminating dormancy, promoting germination, inducing flowering, insecticidal activity, and bactericidal activity, and are characterized by low residue and easy degradation.

[0003] The cyanamide solution is quite sensitive to temperature and light. In the high temperatures of summer, the solution color changes from pale yellow to blue more frequently, which affects the product quality.

[0004] Currently, decolorization methods on the market mainly include electrodialysis, membrane filtration, continuous moving bed methods, and the addition of stabilizers. However, these methods all have certain limitations. For example, electrodialysis and membrane filtration cannot be applied to production, and the addition of stabilizers may affect downstream products and the effects are unstable. Therefore, a new decolorization method is urgently needed to solve this problem. Summary of the Invention

[0005] The purpose of this invention is to provide an apparatus and method for removing the blue color from cyanamide solution, in order to solve the problems mentioned in the background art, which are that the current decolorization methods on the market, such as electrodialysis, membrane filtration, continuous moving bed, and the addition of stabilizers, have certain limitations and unstable effects.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an apparatus for removing the blue color from a cyanamide solution, comprising:

[0007] A hollow tank contains a layer of granular filler. A discharge pipe is inserted into the upper surface of the tank, and the lower end of the discharge pipe extends to the lower inside of the tank. A feed pipe is installed on the upper surface of the tank, and the lower end of the feed pipe is connected to a dispersing head. Small holes are evenly opened on the lower surface of the dispersing head.

[0008] The separation mechanism includes an outer cylinder and an inner cylinder located inside the outer cylinder. A convex filter screen is provided on the upper side of the inner cylinder, and the edge of the filter screen extends into the area between the outer cylinder and the inner cylinder.

[0009] Preferably, the tank body is provided with a dispersion guide hood inside, the packing layer is located on the upper side of the dispersion guide hood, the dispersion guide hood is in the shape of an upwardly convex cone, the discharge pipe passes through the dispersion guide hood and extends to the lower side of the dispersion guide hood, and a gap is left between the edge of the dispersion guide hood and the inner wall of the tank body, through which the cyanamide solution and the packing layer fall.

[0010] Preferably, a discharge pump is installed on the discharge pipe, and the discharge pump draws out the cyanamide solution and packing layer from the tank through the discharge pipe.

[0011] Preferably, a support rod is connected to the lower surface of the filter screen, and the bottom end of the support rod is connected to the outer cylinder or the inner cylinder.

[0012] Preferably, an output pipe is connected to the side wall of the inner cylinder, the output pipe penetrates the outer cylinder and extends to the outside, and the monocyanamide solution collected in the inner cylinder flows out through the output pipe.

[0013] Preferably, a solid-liquid separation and transfer mechanism is connected to the side wall of the outer cylinder, a storage container is provided on the lower side of the solid-liquid separation and transfer mechanism, a reflux adsorption pipe is connected to the upper surface of the tank, the reflux adsorption pipe extends into the storage container, and an adsorption drive pump is installed on the pipeline of the reflux adsorption pipe.

[0014] The solid-liquid separation and transfer mechanism separates the packing layer particles in the outer cylinder from the eluent and outputs them to the storage container. The adsorption drive pump intercepts the packing layer particles in the storage container and sends them into the packing layer in the tank through the reflux adsorption pipe.

[0015] Preferably, the bottom of the inner cavity of the outer cylinder is inclined, and the solid-liquid separation and transmission mechanism is connected to the lowest point of the inner cavity of the outer cylinder. Under the action of gravity, the filler layer particles flow toward the solid-liquid separation and transmission mechanism.

[0016] Preferably, the solid-liquid separation and transmission mechanism includes an inclined outer tube, one end of which is connected to an outer cylinder and the other end extends to the upper side of the storage container. A discharge port is provided on the lower side of the end of the outer tube near the storage container. A transmission auger is rotatably installed inside the outer tube. Filter holes are evenly opened on the surface of the transmission auger, and the transmission auger extends into the outer cylinder.

[0017] The conveying auger rotates, stirring the packing layer particles in the container into the outer tube until they reach the outlet. Finally, the particles fall from the outlet into the storage container. During the conveying process, the eluent in the packing layer particles falls through the filter holes, achieving solid-liquid separation.

[0018] Preferably, a drive motor is installed on the outer wall of the outer tube, and pulleys are installed on the output shaft of the drive motor and the outer end of the transmission auger. The two pulleys are connected by a belt.

[0019] A method for removing the blue color from a cyanamide solution, the specific method being as follows:

[0020] S1: Injecting cyanamide into the packing layer: Install a feed pipe on the upper surface of the tank. The lower end of the feed pipe is connected to a dispersing head. Cyanamide enters the dispersing head from the feed pipe. Small holes are evenly opened on the lower surface of the dispersing head. The cyanamide solution is dispersed from the small holes and falls onto the packing layer of the tank.

[0021] S2: The processed cyanamide is suction-filtered: Based on the feed pipe, the cyanamide solution and packing layer in the lower part of the tank are suctioned out and output to the separation mechanism. The separation mechanism includes an outer cylinder and an inner cylinder located in the outer cylinder. A convex filter screen is provided on the upper side of the inner cylinder, and the edge of the filter screen extends to the area between the outer cylinder and the inner cylinder.

[0022] After the discharge pipe draws out the cyanamide solution and the packing layer, it is output to the upper side of the filter screen. The filter screen separates the cyanamide solution and the packing layer. The cyanamide solution passes through the filter screen and flows into the inner cylinder. The packing layer moves around the filter screen under the action of gravity and falls into the outer cylinder.

[0023] S3: Eluting the packing: Eluent is pre-stored inside the outer cylinder, and the packing particles are regenerated after being eluted in the eluent.

[0024] S4: Recycled packing material after elution: The particles of the regenerated packing layer after elution in step S3 are intercepted and enter the packing layer inside the tank.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] It can effectively remove the blue-causing substances from cyanamide solution, keeping the solution colorless or pale yellow, and has little impact on downstream products.

[0027] The continuous bed mechanism can effectively remove blue substances from cyanamide solution while ensuring product quality; it has little impact on downstream products, is simple to operate, and is easy to scale up for production. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the tank body of the present invention;

[0030] Figure 3 This is a schematic diagram of the internal structure of the outer cylinder and inner cylinder of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the material dispersing head and the feed pipe of the present invention;

[0032] Figure 5 This is a schematic diagram of the solid-liquid separation and transport mechanism of the present invention;

[0033] Figure 6 This is a flowchart of the method of the present invention.

[0034] In the diagram: 1. Tank; 2. Dispersion head; 3. Feed pipe; 4. Discharge pipe; 5. Dispersion guide hood; 6. Packing layer; 7. Discharge pump; 8. Outer cylinder; 9. Inner cylinder; 10. Support rod; 11. Filter screen; 12. Output pipe; 13. Solid-liquid separation and transfer mechanism; 131. Outer pipe; 132. Transfer auger; 133. Drive motor; 134. Pulley; 135. Discharge port; 14. Storage container; 15. Reflux adsorption pipe; 16. Adsorption drive pump. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0037] Example 1:

[0038] Please see Figure 1-6 The present invention provides a technical solution: an apparatus for removing the blue color from a cyanamide solution, comprising:

[0039] A hollow tank 1 contains a granular packing layer 6. A discharge pipe 4 is inserted into the upper surface of the tank 1, and the lower end of the discharge pipe 4 extends to the lower interior of the tank 1. A feed pipe 3 is installed on the upper surface of the tank 1, and the lower end of the feed pipe 3 is connected to a dispersing head 2. Small holes are uniformly opened on the lower surface of the dispersing head 2. The packing layer 6 is made of anion exchange resin, which uses its hydroxyl ions to exchange the blue-causing substances in the cyanamide solution.

[0040] The separation mechanism includes an outer cylinder 8 and an inner cylinder 9 located inside the outer cylinder 8. A convex filter screen 11 is provided on the upper side of the inner cylinder 9, and the edge of the filter screen extends into the area between the outer cylinder 8 and the inner cylinder 9.

[0041] Example 2:

[0042] Please see Figure 1-6 The present invention provides a technical solution based on Embodiment 1: a dispersion guide hood 5 is provided inside the tank body 1, the packing layer 6 is located on the upper side of the dispersion guide hood 5, the dispersion guide hood 5 is in the shape of an upwardly convex cone, the discharge pipe 4 passes through the dispersion guide hood 5 and extends to the lower side of the dispersion guide hood 5, and a gap is left between the edge of the dispersion guide hood 5 and the inner wall of the tank body 1, and the cyanamide solution and the packing layer 6 fall from the gap.

[0043] Analysis of the above content: The setting of the dispersion guide hood 5 can slow down the falling speed of the cyanamide solution and the packing layer 6, so that there is enough reaction time between the cyanamide solution and the packing layer 6, and prevent the cyanamide solution and the packing layer 6 from entering the lower side of the tank 1 in a concentrated manner.

[0044] Example 3:

[0045] Please see Figure 1-6 The present invention provides a technical solution based on Embodiment 1: a discharge pump 7 is installed on the discharge pipe 4, and the discharge pump 7 draws out the monocyanamide solution and the packing layer 6 from the tank 1 through the discharge pipe 4.

[0046] Analysis of the above content: The setting of the discharge pump 7 facilitates the extraction of cyanamide solution and packing layer 6 from tank 1 through discharge pipe 4.

[0047] Example 4:

[0048] Please see Figure 1-6 The present invention provides a technical solution based on Embodiment 1: a support rod 10 is connected to the lower surface of the filter screen 11, and the bottom end of the support rod 10 is connected to the outer cylinder 8 or the inner cylinder 9.

[0049] Analysis of the above content: The filter screen 11 is connected to the outer cylinder 8 or the inner cylinder 9 through the support rod 10 to maintain the stability of the filter screen 11. During the filtration process, the filter screen 11 will not shift to the side due to impact.

[0050] Example 5:

[0051] Please see Figure 1-6 The present invention provides a technical solution based on Embodiment 1: an output pipe 12 is connected to the side wall of the inner cylinder 9, the output pipe 12 penetrates the outer cylinder 8 and extends to the outside, and the monocyanamide solution collected in the inner cylinder 9 flows out through the output pipe 12.

[0052] Analysis of the above content: Output tube 12 will output the processed cyanamide solution in a concentrated manner.

[0053] Example 6:

[0054] Please see Figure 1-6 The present invention provides a technical solution based on Embodiment 1: a solid-liquid separation and transmission mechanism 13 is connected to the side wall of the outer cylinder 8, a storage container 14 is provided on the lower side of the solid-liquid separation and transmission mechanism 13, a reflux adsorption pipe 15 is connected to the upper surface of the tank 1, the reflux adsorption pipe 15 extends into the storage container 14, and an adsorption drive pump 16 is installed on the pipeline of the reflux adsorption pipe 15.

[0055] The solid-liquid separation and transfer mechanism 13 separates the particles of the packing layer 6 in the outer cylinder 8 from the eluent and outputs them to the storage container 14. The adsorption drive pump 16 intercepts the particles of the packing layer 6 in the storage container 14 and enters the packing layer 6 in the tank 1 through the reflux adsorption pipe 15.

[0056] Example 7:

[0057] Please see Figure 1-6 The present invention provides a technical solution based on embodiment six: the bottom of the inner cavity of the outer cylinder 8 is set in an inclined shape, and the solid-liquid separation and transmission mechanism 13 is connected to the lowest point of the bottom of the inner cavity of the outer cylinder 8. Under the action of gravity, the particles of the packing layer 6 flow to the solid-liquid separation and transmission mechanism 13.

[0058] Analysis of the above content: The inclined design makes it easy for the 6 particles in the filler layer to aggregate together, making it convenient to extract them.

[0059] Example 8:

[0060] Please see Figure 1-6 The present invention provides a technical solution based on embodiment six: the solid-liquid separation and transmission mechanism 13 includes an inclined outer tube 131, one end of the outer tube 131 is connected to the outer cylinder 8 and the other end extends to the upper side of the storage container 14, a discharge port 135 is provided on the lower side of the end of the outer tube 131 near the storage container 14, a transmission auger 132 is rotatably installed inside the outer tube 131, filter holes are uniformly opened on the surface of the transmission auger 132, and the transmission auger 132 extends into the outer cylinder 8;

[0061] The conveying auger 132 rotates, stirring the packing layer 6 particles in the container 14 into the outer tube 131 until they reach the discharge port 135. Finally, the particles fall from the discharge port 135 into the storage container 14. During the conveying process, the eluent in the packing layer 6 particles falls through the filter holes, achieving solid-liquid separation.

[0062] Example 9:

[0063] Please see Figure 1-6 The present invention provides a technical solution based on embodiment eight: a drive motor 133 is installed on the outer wall of the outer tube 131, and pulleys 134 are installed on the output shaft of the drive motor 133 and the outer end of the transmission auger 132, and the two pulleys 134 are connected by a belt.

[0064] Analysis of the above content: Based on the drive motor 133 driving the transmission auger 132 to rotate, it does not require manual or other external force and can be remotely controlled, making operation relatively convenient. The speed of the transmission auger 132 can be adjusted according to the needs of use to meet the transmission requirements.

[0065] Example 10:

[0066] The specific removal method is as follows:

[0067] S1: Injecting cyanamide into the packing layer 6: Install a feed pipe 3 on the upper surface of the tank 1. The lower end of the feed pipe 3 is connected to the dispersing head 2. Cyanamide enters the dispersing head 2 from the feed pipe 3. Small holes are evenly opened on the lower surface of the dispersing head 2. The cyanamide solution is dispersed from the small holes and falls onto the packing layer 6 of the tank 1. The packing layer 6 is made of anion exchange resin. The anion exchange resin uses its hydroxyl ions to exchange the blueing substances in the cyanamide solution.

[0068] S2: The processed cyanamide is suction-filtered: Based on the feed pipe 3, the cyanamide solution and packing layer 6 in the lower part of the tank 1 are suctioned out and output to the separation mechanism. The separation mechanism includes an outer cylinder 8 and an inner cylinder 9 located inside the outer cylinder 8. A convex filter screen 11 is provided on the upper side of the inner cylinder 9, and the edge of the filter screen extends to the area between the outer cylinder 8 and the inner cylinder 9.

[0069] After the discharge pipe 4 draws out the cyanamide solution and the packing layer 6, it is output to the upper side of the filter screen 11. The filter screen 11 separates the cyanamide solution and the packing layer 6. The cyanamide solution passes through the filter screen 11 and flows into the inner cylinder 9. The packing layer 6 moves around the filter screen 11 under the action of gravity and falls into the outer cylinder 8.

[0070] S3: Eluting the packing: Eluent is pre-stored in the outer cylinder 8, and the particles in the packing layer 6 are eluted in the eluent and then regenerated.

[0071] S4: Recycled packing material after elution: The particles of the regenerated packing layer 6 after elution in step S3 are intercepted and enter the packing layer 6 inside the tank 1.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present 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 its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the invention is defined by the appended claims rather than the foregoing description. Therefore, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

[0073] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for removing the blue color from a monochloramine solution, comprising: include: A hollow tank (1) contains a granular packing layer (6). A discharge pipe (4) is inserted into the upper surface of the tank (1). The lower end of the discharge pipe (4) extends to the lower inside of the tank (1). A feed pipe (3) is installed on the upper surface of the tank (1). The lower end of the feed pipe (3) is connected to a dispersing head (2). Small holes are evenly opened on the lower surface of the dispersing head (2). The separation mechanism includes an outer cylinder (8) and an inner cylinder (9) located inside the outer cylinder (8). A convex filter screen (11) is provided on the upper side of the inner cylinder (9), and the edge of the filter screen extends to the area between the outer cylinder (8) and the inner cylinder (9). The tank (1) is equipped with a dispersion guide hood (5) inside. The packing layer (6) is located on the upper side of the dispersion guide hood (5). The dispersion guide hood (5) is in the shape of an upwardly convex cone. The discharge pipe (4) passes through the dispersion guide hood (5) and extends to the lower side of the dispersion guide hood (5). There is a gap between the edge of the dispersion guide hood (5) and the inner wall of the tank (1). The cyanamide solution and the packing layer (6) fall from the gap. A solid-liquid separation and transfer mechanism (13) is connected to the side wall of the outer cylinder (8). A storage container (14) is provided on the lower side of the solid-liquid separation and transfer mechanism (13). A reflux adsorption pipe (15) is connected to the upper surface of the tank (1). The reflux adsorption pipe (15) extends into the storage container (14). An adsorption drive pump (16) is installed on the pipeline of the reflux adsorption pipe (15). The solid-liquid separation and transfer mechanism (13) separates the particles of the packing layer (6) in the outer cylinder (8) from the eluent and outputs them to the storage container (14). The adsorption drive pump (16) transports the particles of the packing layer (6) in the storage container (14) into the packing layer (6) in the tank (1) through the reflux adsorption pipe (15). The bottom of the inner cavity of the outer cylinder (8) is inclined. The solid-liquid separation and transmission mechanism (13) is connected to the lowest point of the inner cavity of the outer cylinder (8). Under the action of gravity, the particles of the packing layer (6) flow to the solid-liquid separation and transmission mechanism (13).

2. The device for removing the blue color of monomethylamine solution according to claim 1, characterized in that: A discharge pump (7) is installed on the discharge pipe (4). The discharge pump (7) draws out the monocyanamide solution and the packing layer (6) in the tank (1) through the discharge pipe (4).

3. The device for removing the blue color of monomethylamine solution according to claim 1, characterized in that: The lower surface of the filter screen (11) is connected to a support rod (10), and the bottom end of the support rod (10) is connected to the outer cylinder (8) or the inner cylinder (9).

4. The device for removing the blue color of monomethylamine solution according to claim 1, characterized in that: An output pipe (12) is connected to the side wall of the inner cylinder (9). The output pipe (12) penetrates the outer cylinder (8) and extends to the outside. The monocyanamide solution collected in the inner cylinder (9) flows out through the output pipe (12).

5. The device for removing the blue color of monomethylamine solution according to claim 1, characterized in that: The solid-liquid separation and transfer mechanism (13) includes an inclined outer tube (131), one end of which is connected to the outer cylinder (8) and the other end extends to the upper side of the storage container (14). A discharge port (135) is provided on the lower side of the outer tube (131) near the storage container (14). A transfer auger (132) is rotatably installed inside the outer tube (131). Filter holes are evenly opened on the surface of the transfer auger (132), and the transfer auger (132) extends into the outer cylinder (8). The conveying auger (132) rotates and stirs the particles in the outer cylinder (8) into the outer tube (131) until they reach the discharge port (135). Finally, the particles fall from the discharge port (135) into the storage container (14). During the conveying process, the eluent in the particles of the packing layer (6) falls from the filter hole to achieve solid-liquid separation.

6. The device for removing the blue color of monomethylamine solution according to claim 5, characterized in that: A drive motor (133) is installed on the outer wall of the outer tube (131). The output shaft of the drive motor (133) and the outer end of the transmission auger (132) are both equipped with pulleys (134). The two pulleys (134) are connected by a belt.

7. A method for removing the blue color of a monocyamide solution, using the apparatus for removing the blue color of a monocyamide solution according to any one of claims 1 to 6, characterized in that, The specific removal method is as follows: S1: Injecting cyanamide into the packing layer (6): Install a feed pipe (3) on the upper surface of the tank (1). The lower end of the feed pipe (3) is connected to the dispersing head (2). Cyanamide enters the dispersing head (2) from the feed pipe (3). Small holes are evenly opened on the lower surface of the dispersing head (2). The cyanamide solution is dispersed from the small holes and falls onto the packing layer (6) of the tank (1). S2: The treated cyanamide is suctioned and filtered: Based on the discharge pipe (4), the cyanamide solution and packing layer (6) in the lower part of the tank (1) are suctioned out and output to the separation mechanism. The separation mechanism includes an outer cylinder (8) and an inner cylinder (9) located inside the outer cylinder (8). A convex filter screen (11) is provided on the upper side of the inner cylinder (9). The edge of the filter screen extends to the area between the outer cylinder (8) and the inner cylinder (9). After the discharge pipe (4) draws out the cyanamide solution and the packing layer (6), it outputs to the upper side of the filter screen (11). The filter screen (11) separates the cyanamide solution and the packing layer (6). The cyanamide solution passes through the filter screen (11) and flows into the inner cylinder (9). The packing layer (6) moves around the filter screen (11) under the action of gravity and falls into the outer cylinder (8). S3: Eluting the packing: Eluent is pre-stored inside the outer cylinder (8), and the packing layer (6) particles are regenerated after being eluted in the eluent; S4: The eluted packing is reused: After the packing layer (6) particles in step S3 are eluted, the solid-liquid separation and transfer mechanism (13) separates the packing layer (6) particles in the outer cylinder (8) from the eluent and outputs them to the storage container (14). The adsorption drive pump (16) transports the packing layer (6) particles in the storage container (14) into the packing layer (6) in the tank (1) through the return adsorption pipe (15).

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