Water pretreatment system for cyanamide low-temperature hydrolysis reaction

Abstract

The utility model relates to a water pretreatment system for cyanamide low-temperature hydrolysis reaction. The water pretreatment system comprises filtering equipment for filtering impurities in water, neutralizing equipment for adjusting the pH value of the water and a water storage tank, a first water outlet pipe of the filtering equipment is communicated with a second water inlet pipe of the neutralizing equipment through a first connecting pipe; a first water pump is mounted on the first connecting pipe; a second water outlet pipe of the neutralization equipment is communicated with a third water inlet pipe of the water storage tank through a second connecting pipe; a second water pump is mounted on the second connecting pipe; a first three-way pipe fitting is connected to a first water inlet pipe of the filtering device, a second three-way pipe fitting is connected to a third water outlet pipe of the water storage tank, one port of the first three-way pipe fitting is communicated with one port of the second three-way pipe fitting through a third connecting pipe, and a third water pump is installed on the third connecting pipe. Impurities in industrial water are filtered through the filtering device, the purity of the industrial water is improved, the PH of the industrial water is neutralized through the neutralizing device, and the production quality of cyanamide is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of cyanamide hydrolysis technology, specifically to a pretreatment system for water used in the low-temperature hydrolysis reaction of cyanamide. Background Technology

[0002] Monocyanamide, scientifically known as aminocyanide, is used in pesticides, pharmaceutical intermediates, and cyanuramide. It is produced by adding water and calcium cyanamide to a hydrolysis reactor, followed by the introduction of carbon dioxide gas to calcify and precipitate the cyanamide product. Because monocyanamide is highly reactive and readily polymerizes to form dicyandiamide during production, one of the most crucial indicators is ensuring that the dicyandiamide content does not exceed the acceptable limit; otherwise, the quality of the final product will be affected. Therefore, during monocyanamide hydrolysis, the reaction temperature must be controlled to ≤30℃ and the pH value to ≤8.5 to effectively control the dicyandiamide content and meet the requirements.

[0003] Existing industrial water often contains a large number of impurities, and the pH value of some industrial water does not meet the reaction requirements, which is not conducive to the reaction and affects the production quality of cyanamide. Therefore, industrial water needs to be pretreated before the hydrolysis reaction to filter out impurities and adjust the pH value of the water to meet the production conditions of the cyanamide hydrolysis reaction and ensure the production quality of cyanamide. Utility Model Content

[0004] This invention addresses the shortcomings of existing technologies by providing a pretreatment system for water used in the low-temperature hydrolysis reaction of cyanamide, which effectively removes various impurities from the water, adjusts the pH value of the water, and improves the quality of cyanamide production.

[0005] This utility model is achieved through the following technical solution: a pretreatment system for water used in the low-temperature hydrolysis reaction of cyanamide, comprising a filtration device for filtering impurities in the water, a neutralization device for adjusting the pH value of the water, and a water storage tank; the first outlet pipe of the filtration device is connected to the second inlet pipe of the neutralization device through a first connecting pipe, and a first water pump is installed on the first connecting pipe; the second outlet pipe of the neutralization device is connected to the third inlet pipe of the water storage tank through a second connecting pipe, and a second water pump is installed on the second connecting pipe; a tee fitting is connected to the first inlet pipe of the filtration device, and a tee fitting is connected to the third outlet pipe of the water storage tank; one port of the tee fitting is connected to one port of the tee fitting, and a third water pump is installed on the third connecting pipe.

[0006] This solution uses a filtration system to remove impurities from industrial water, improving its purity. A first pump sends the filtered water to a neutralization unit to adjust the pH. The neutralization unit neutralizes the pH, ensuring the necessary conditions for cyanamide hydrolysis. A second pump then sends the neutralized water to a storage tank for further hydrolysis. If the storage tank remains stagnant for an extended period, causing impurities to regenerate, or if the stored water no longer meets the required conditions, a third pump can re-filter the water to meet the production conditions for the cyanamide hydrolysis reaction, ensuring the quality of cyanamide production and providing greater convenience.

[0007] As an optimization, the filtration equipment includes a filter tank and a filter fixed inside the filter tank. The filter has an opening at the top and a base plate fixed to the bottom, with multiple drainage holes on the base plate. Inside the filter, from top to bottom, are arranged a coarse sand filter layer, a fine sand filter layer, an activated carbon adsorption layer, and a magnetic ball adsorption layer. In this optimized solution, industrial water enters the filter tank and is filtered by the filter. The coarse and fine sand filter layers filter large and small particulate impurities in the water, the activated carbon adsorption layer adsorbs micro-particulate impurities, and the magnetic ball adsorption layer adsorbs micro-metallic impurities. Through multi-layer filtration and adsorption, impurities in the industrial water are more thoroughly removed, ensuring water quality, preventing the generation of excess impurities during hydrolysis reactions, and guaranteeing production quality.

[0008] As an optimization, a support ring is fixed to the inner wall of the filter tank, and multiple overlapping plates are evenly distributed and fixed to the outer wall of the filter along the circumference, with the overlapping plates resting on the support ring. In this optimized design, the filter is mounted on the support ring via the overlapping plates, making it easy to remove, clean internal impurities, and replace the filter layer and adsorption layer.

[0009] As an optimization, the filter is equipped with a vertically extending lifting rod. The lower end of the lifting rod is fixed to the base plate, and the upper end of the lifting rod extends to the outside of the filter and is fixed with a handle. This optimized design allows personnel to easily lift and remove the filter, making it convenient and labor-saving to use.

[0010] As an optimization, the first inlet pipe is fixed to the top of the filter tank, with its lower end extending into the interior of the filter tank. The lower port of the first inlet pipe is closed. Multiple branch pipes are evenly distributed and fixed to the outer wall of the first inlet pipe along its circumference, with the outlets of the branch pipes facing the filter. In this optimized design, the first inlet pipe of the filter tank sprays industrial water evenly onto the filter along its circumference through multiple branch pipes, preventing industrial water from concentrating in one area for filtration, thereby improving filtration efficiency and effect.

[0011] As an optimization, the filter tank includes a tank body and a top cover. A first flange is fixedly connected to the upper end of the tank body, and a second flange is fixedly connected to the lower end of the top cover. The first flange and the second flange are fixedly connected by bolts. This optimized filter tank adopts a split design, which facilitates disassembly and assembly, and makes internal cleaning and maintenance easier.

[0012] As an optimization, the neutralization equipment includes a neutralization tank and a stirring mechanism installed on the tank. The neutralization tank is equipped with a neutralizing agent inlet pipe and a pH meter. This optimized solution adds a neutralizing agent to the industrial water through the neutralizing agent inlet pipe, and the stirring mechanism ensures thorough contact and neutralization between the water and the neutralizing agent, improving neutralization efficiency. The pH meter monitors the water's pH value, facilitating pH control and adjustment.

[0013] As an optimization, the stirring mechanism includes a rotating shaft rotatably connected to the top of the neutralization tank. A motor driving the rotating shaft is fixed to the top of the neutralization tank, and multiple stirring rods are fixed to the outer wall of the rotating shaft. This optimized solution uses a motor to drive the rotating shaft to rotate, causing the stirring rods to stir.

[0014] The beneficial effects of this invention are as follows: The filtration equipment filters impurities in industrial water, improving its purity. During filtration, large and small particles of impurities are filtered through coarse and fine sand layers, micro-particles are adsorbed through an activated carbon adsorption layer, and micro-metallic impurities are adsorbed through a magnetic ball adsorption layer. This multi-layer filtration and adsorption process thoroughly removes impurities from the industrial water, ensuring water quality, preventing the generation of excess impurities during hydrolysis reactions, and guaranteeing production quality.

[0015] The filtered industrial water is pumped into a neutralization unit by a first pump to adjust its pH value. The neutralization unit neutralizes the pH of the industrial water, ensuring the conditions for cyanamide hydrolysis. A second pump then pumps the neutralized industrial water into a storage tank for later use in the hydrolysis reaction. If the storage tank remains stagnant for an extended period and impurities regenerate, or if the stored water does not meet the required conditions, a third pump can re-purge the industrial water into the filtration unit to meet the production conditions for the cyanamide hydrolysis reaction, ensuring the quality of cyanamide production and making the process more convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the process of this utility model;

[0017] Figure 2 This is a cross-sectional view of the filtration equipment;

[0018] Figure 3 This is a bottom view of the internal structure of the top cover;

[0019] Figure 4 This is a top view of the internal structure of the tank.

[0020] Figure 5 This is a cross-sectional view of the filter;

[0021] Figure 6 This is a cross-sectional view of the neutralization equipment;

[0022] Figure 7This is a schematic diagram of the water storage tank structure;

[0023] As shown in the figure:

[0024] 1. Filtration equipment; 2. Neutralization equipment; 21. Neutralization tank; 22. Second inlet pipe; 23. Second outlet pipe; 24. Neutralizing agent inlet pipe; 25. pH meter; 26. Rotating shaft; 27. Motor; 28. Stirring rod; 3. Water storage tank; 31. Third inlet pipe; 32. Third outlet pipe; 4. First connecting pipe; 5. First water pump; 6. Second connecting pipe; 7. Second water pump; 8. Third connecting pipe. 9. Third water pump; 10. T-fitting 1; 11. T-fitting 2; 12. Filter tank; 121. Tank body; 122. Top cover; 13. Filter; 131. Bottom plate; 132. Drain hole; 133. Coarse sand filter layer; 134. Fine sand filter layer; 135. Activated carbon filter layer; 136. Magnetic ball filter layer; 137. Lifting rod; 138. Handle; 14. Support ring; 15. Overlap plate; 16. First inlet pipe; 17. Branch pipe; 18. First outlet pipe; 19. Switch valve. Detailed Implementation

[0025] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0026] like Figures 1-7 As shown, a pretreatment system for water used in the low-temperature hydrolysis reaction of cyanamide includes a filtration device 1 for filtering impurities in the water, a neutralization device 2 for adjusting the pH value of the water, and a water storage tank 3.

[0027] like Figure 1 As shown, the first outlet pipe 18 of the filtration device 1 is connected to the second inlet pipe 22 of the neutralization device 2 via a first connecting pipe 4, and a first water pump 5 is installed on the first connecting pipe 4. The second outlet pipe 23 of the neutralization device 2 is connected to the third inlet pipe 31 of the water storage tank 3 via a second connecting pipe 6, and a second water pump 7 is installed on the second connecting pipe 6. A tee fitting 10 is connected to the first inlet pipe 16 of the filtration device 1, and a tee fitting 11 is connected to the third outlet pipe 32 of the water storage tank 3. One port of the tee fitting 10 and one port of the tee fitting 11 are connected via a third connecting pipe 8, and a third water pump 9 is installed on the third connecting pipe 8.

[0028] Industrial water enters filtration equipment 1, where impurities are filtered out to improve its purity. The filtered industrial water is then pumped by a first pump 5 to a neutralization equipment 2 to adjust the pH value. Neutralization equipment 2 neutralizes the pH of the industrial water, ensuring the conditions for cyanamide hydrolysis. The neutralized industrial water is then pumped by a second pump 7 into a storage tank 3 for storage and use in the hydrolysis reaction. If impurities regenerate in the storage tank 3 due to prolonged stagnation, or if the filtered and neutralized industrial water does not meet the hydrolysis conditions, it can be pumped back into filtration equipment 1 by a third pump 8 for re-filtration and neutralization to meet the production conditions for the cyanamide hydrolysis reaction, ensuring the quality of cyanamide production and providing convenience.

[0029] like Figure 2 , 5 As shown, specifically, the filtration device 1 includes a filter tank 12 and a filter 13 fixed inside the filter tank 12. The filter 13 is provided with a coarse sand filter layer 133, a fine sand filter layer 134, an activated carbon adsorption layer 135, and a magnetic ball adsorption layer 136 from top to bottom.

[0030] The filter 13 described in this embodiment has a funnel-shaped structure with an opening at the top and a base plate 131 fixed to the bottom. Multiple drainage holes 132 are provided on the base plate 131. The coarse sand filter layer 133, fine sand filter layer 134, activated carbon adsorption layer 135, and magnetic ball adsorption layer 136 are laid layer by layer inside the filter 13 from top to bottom. During filtration, industrial water enters from the top of the filter 13, passes through the coarse sand filter layer, fine sand filter layer, activated carbon adsorption layer, and magnetic ball adsorption layer in sequence, and then exits from the drainage holes 132 at the bottom of the filter.

[0031] A support ring 14 is fixedly connected to the inner wall of the filter tank 12, and multiple overlapping plates 15 are evenly distributed and fixedly connected to the outer wall of the filter 13 along the circumference. The overlapping plates 15 overlap the support ring 14. A vertically extending lifting rod 137 is provided inside the filter 13. The lower end of the lifting rod 137 is fixedly connected to the center of the base plate 131, and the upper end of the lifting rod 137 extends to the outside of the filter 13 and is fixedly connected to a handle 138. In use, personnel can lift the filter 13 by pulling the handle 138 to remove it. When placing the filter, the overlapping plates 15 around the filter 13 are placed on the support ring 14 to fix the filter 13 in the filter tank 12, facilitating the replacement of the filter layer and adsorption layer, making it convenient to use.

[0032] The filter tank 12 described in this embodiment includes a tank body 121 and a top cover 122. A first flange is fixedly connected to the upper end of the tank body 121, and a second flange is fixedly connected to the lower end of the top cover 122. The first flange and the second flange are fixedly connected by bolts. The support ring 14 is fixedly connected to the inner wall of the tank body 121, and the filter 13 is placed in the tank body 121. The filter tank 12 adopts a split design, which is convenient for disassembly and assembly, and facilitates the removal or placement of the filter.

[0033] The first inlet pipe 16 is fixed to the top of the filter tank 12, and its lower end extends into the interior of the filter tank 12. The lower end of the first inlet pipe 16 is closed. Multiple branch pipes 17 are evenly distributed and fixed to the outer wall of the first inlet pipe 16 within the filter tank 12, with the outlets of the branch pipes 17 facing the filter 13. In this embodiment, the first inlet pipe 16 is fixed to the center of the top cover 122, and the first outlet pipe 18 is located at the bottom of the tank body 121. A switch valve 19 is installed on the first outlet pipe 18. The first inlet pipe 16 of the filter tank 12 sprays industrial water evenly onto the filter in a circumferential direction through the multiple branch pipes 17, avoiding the concentration of industrial water in one place for filtration, thereby improving filtration efficiency and effect.

[0034] Specifically, the neutralization device 2 includes a neutralization tank 21 and a stirring mechanism installed on the neutralization tank 21. The neutralization tank 21 is provided with a neutralizing agent inlet pipe 24 and a pH meter 25 is installed on the neutralization tank 21. In this embodiment, the second water inlet pipe 22 is located at the top of the neutralization tank 21, the second water outlet pipe 23 is located at the bottom of the neutralization tank 21, and a switch valve 19 is installed on the second water outlet pipe 23.

[0035] The stirring mechanism includes a rotating shaft 26 rotatably connected to the top of the neutralization tank 21. A motor 27 for driving the rotating shaft 26 is fixedly mounted on the top of the neutralization tank 21. Multiple stirring rods 28 are fixedly attached to the outer wall of the rotating shaft 26. Neutralizing agent is added to the industrial water through the neutralizing agent inlet pipe. The stirring mechanism ensures that the water and neutralizing agent come into full contact and neutralize each other, improving neutralization efficiency. The pH value of the water is monitored by a pH meter, facilitating the control and adjustment of the water's pH value.

[0036] Working Principle: During use, the unused port of T-fitting 10 can be connected to the water supply, and the unused port of T-fitting 11 can be connected to the hydrolysis reactor. Industrial water is supplied to the filter tank 12. The industrial water is sprayed onto the filter 13 through multiple branch pipes 17, passing sequentially through the coarse sand filter layer 133 and the fine sand filter layer 134 to filter large and small particulate impurities. Micro-particulate impurities are adsorbed through the activated carbon adsorption layer 135, and micro-metallic impurities are adsorbed through the magnetic balls in the magnetic ball adsorption layer 136. This multi-layer filtration and adsorption process thoroughly cleans the industrial water, ensuring water quality. The filtered industrial water is pumped to the neutralization tank 21 by the first water pump 5. Neutralizing agent is added through the neutralizing agent inlet pipe 24, and the stirring mechanism ensures full contact and neutralization between the industrial water and the neutralizing agent. The pH value of the industrial water is measured by the pH meter 25 until it meets the hydrolysis requirements. The neutralized industrial water is pumped to the storage tank 3 by the second water pump 7, and then enters the hydrolysis reactor to participate in the reaction. If the industrial water is left to stand in the storage tank 3 for a long time, new precipitates and impurities may be generated. The industrial water is then pumped to the filter tank 12 by the third water pump 9 for re-filtration and neutralization, and can then be reused.

[0037] Of course, the above description is not limited to the examples above. Technical features not described in this utility model can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A monomethyl amine low temperature hydrolysis reaction with water pretreatment system, characterized by: It includes a filtration device (1) for filtering impurities in water, a neutralization device (2) for adjusting the pH value of water, and a water storage tank (3). The first outlet pipe (18) of the filtration device (1) is connected to the second inlet pipe (22) of the neutralization device (2) through the first connecting pipe (4), and the first water pump (5) is installed on the first connecting pipe (4). The second outlet pipe (23) of the neutralization device (2) is connected to the third inlet pipe (31) of the water storage tank (3) through the second connecting pipe (6), and a second water pump (7) is installed on the second connecting pipe (6). The first inlet pipe (16) of the filter device (1) is connected to a three-way fitting (10), and the third outlet pipe (32) of the water storage tank (3) is connected to a three-way fitting (11). One port of the three-way fitting (10) and one port of the three-way fitting (11) are connected through a third connecting pipe (8). A third water pump (9) is installed on the third connecting pipe (8).

2. The monosaimne cryogenic hydrolysis reaction with water pretreatment system of claim 1, wherein: The filtration device (1) includes a filter tank (12) and a filter (13) fixed inside the filter tank. The filter (13) has an opening at the top and a base plate (131) fixed at the bottom. Multiple drainage holes (132) are opened on the base plate. The filter (13) is provided with a coarse sand filter layer (133), a fine sand filter layer (134), an activated carbon adsorption layer (135), and a magnetic ball adsorption layer (136) from top to bottom.

3. The pretreatment system for water used in the low-temperature hydrolysis reaction of cyanamide according to claim 2, characterized in that: A support ring (14) is fixed to the inner wall of the filter tank (12), and multiple overlapping plates (15) are evenly distributed and fixed to the outer wall of the filter (13) along the circumference. The overlapping plates are laid on the support ring (14).

4. The pretreatment system for water used in the low-temperature hydrolysis reaction of cyanamide according to claim 3, characterized in that: The filter (13) is provided with a vertically extending lifting rod (137), the lower end of the lifting rod is fixed to the bottom plate (131), and the upper end of the lifting rod (137) extends to the outside of the filter (13) and is fixed to a handle (138).

5. The water pretreatment system for the low-temperature hydrolysis reaction of cyanamide according to any one of claims 2 to 4, characterized in that: The first water inlet pipe (16) is fixed at the top of the filter tank (12). The lower end of the first water inlet pipe (16) extends into the interior of the filter tank (12), and the lower end of the first water inlet pipe is closed. Multiple branch pipes (17) are evenly distributed and fixed on the outer wall of the first water inlet pipe (16) in the circumferential direction. The outlet of the branch pipe faces the filter (13).

6. The water pretreatment system for the low-temperature hydrolysis reaction of cyanamide according to claim 2, characterized in that: The filter tank (12) includes a tank body (121) and a top cover (122). A first flange is fixedly connected to the upper end of the tank body, and a second flange is fixedly connected to the lower end of the top cover. The first flange and the second flange are fixedly connected by bolts.

7. The pretreatment system for water used in the low-temperature hydrolysis reaction of cyanamide according to claim 1, characterized in that: The neutralization device (2) includes a neutralization tank (21) and a stirring mechanism installed on the neutralization tank. The neutralization tank is provided with a neutralizing agent inlet pipe (24) and a pH meter (25) is installed on the neutralization tank.

8. The water pretreatment system for the low-temperature hydrolysis reaction of cyanamide according to claim 7, characterized in that: The stirring mechanism includes a rotating shaft (26) rotatably connected to the top of the neutralization tank (21), a motor (37) for driving the rotating shaft to rotate is fixed on the top of the neutralization tank, and multiple stirring rods (28) are fixed on the outer wall of the rotating shaft.

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