A method for producing polyphosphate

Abstract

The invention discloses a production method of polyphosphate, including a production system using the following structure, including a premixer, a polymerization reactor, a distributing device, a cutting device, a pulverizer, a conveyor and a packaging machine; the preparation process is as follows: step 1: the raw materials and additives are uniformly mixed in the premixer in proportion; step 2: the liquid material obtained after uniform mixing in the premixer is uniformly sprayed on the belt conveyor assembly of the polymerization reactor by the distributing device, and the liquid material is allowed to enter the high temperature zone in the polymerization reactor for reaction for 0.5-2h under the action of the belt conveyor assembly; then enter the low temperature zone in the polymerization reactor for cooling, and complete the polymer curing process; step 3: the polyphosphate after curing and cooling is scraped off by the cutting device, and the scraped polyphosphate enters the pulverizer for crushing. It is mainly used for rapid and continuous preparation of polyphosphate, and has the advantages of high automation and high production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of polyphosphate production, and in particular to a polyphosphate production method and a production system. Background Art

[0002] Polyphosphates include sodium tripolyphosphate, potassium tripolyphosphate, ammonium polyphosphate, aluminum tripolyphosphate, polyaluminum phosphate (condensed aluminum phosphate), and the like.

[0003] Sodium tripolyphosphate (abbreviated as STPP), commonly known as pentasodium, is a type of amorphous water-soluble linear polyphosphate, terminated at both ends with Na2PO4, with a chemical formula of Na5P3O 10 The industrial grade can be used as the main auxiliary agent of synthetic detergents, industrial water softener, leather pretanning agent, etc. The food grade can be used as a food additive in food processing as a moisture retainer, quality improver, pH regulator, and metal chelating agent; the molecular formula of potassium tripolyphosphate is K5P3O 10 It has the effects of suspending, dispersing, peptizing and emulsifying soil and oil. It can be used for soil improvement and emulsification of oil. Its pH can be adjusted in a wide range. It can be used as a buffer for liquid detergents and is also a highly effective plant nutrient. Ammonium polyphosphate (APP) is a polyphosphate containing N and P. It can be divided into three types according to its degree of polymerization: oligomeric, mesomeric and high. The higher the degree of polymerization, the lower the water solubility. The general molecular formula of ammonium polyphosphate is (NH4) n+2 P n O 3n+1 When n≤20, it is water-soluble; when n>20, it is poorly soluble. High-polymerization-degree water-insoluble long-chain ammonium polyphosphate is used to prepare fire-retardant coatings and flame-retardant plastics. Low-polymerization-degree water-soluble products can be used for high-concentration slow-release compound fertilizers or liquid fertilizers. The molecular formula of aluminum tripolyphosphate is AlH2P3O 10 ·2H20, in which the tripolyphosphate ion can have a stronger chelating force with various metal ions, forming an excellent passivation film on the surface of the coated object, which has a strong inhibitory effect on the corrosion of steel and light metals, and is particularly suitable for non-toxic light-colored anti-rust paint; polyaluminum phosphate is mainly used as a curing agent and binder in the fields of inorganic adhesives, coatings, inorganic building materials, ceramics and inorganic molding materials.

[0004] The use of polyphosphates is very common in life, but the prior art lacks a corresponding preparation system and method. The production system described in the present invention can be generally used for the production of all the above-mentioned polyphosphates. Summary of the invention

[0005] The object of the present invention is to provide a method for producing polyphosphate, which is mainly used for rapidly preparing polyphosphate and has the advantages of high automation and high production efficiency.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A polyphosphate production system comprises a premixer, a polymerization reactor, a material distribution device, a cutting device, a pulverizer, a conveyor and a packaging machine, wherein the outlet of the premixer is connected to the material distribution device via a feeding pump, the polymerization reactor comprises a shell, a high temperature zone and a low temperature zone arranged in the shell, and a belt conveyor assembly arranged in the shell, a heat preservation partition is arranged in the shell, and the heat preservation partition divides the shell into two parts, one part is the high temperature zone, and the other end is the low temperature zone, a heating assembly is arranged in the high temperature zone, and a cooling assembly is arranged in the low temperature zone; the material distribution device is located above the belt conveyor assembly of the polymerization reactor; the cutting device is arranged at the end of the belt conveyor assembly and is used to scrape the solidified polyphosphate from the belt conveyor assembly; the pulverizer is arranged below the cutting device and is used to crush the scraped polyphosphate, the material outlet of the pulverizer is connected to a hopper via the conveyor, and the packaging machine is arranged at the material outlet of the hopper.

[0008] Further optimized, the premixer is a SMX type, SMV type, SD type or SK type static mixer.

[0009] Wherein, the material distributing device is a swinging material distributing device.

[0010] The heating assembly includes a plurality of U-shaped radiation heating tubes which are arranged in a high temperature zone and use natural gas as fuel, and a plurality of heat transfer fins are arranged at intervals on the U-shaped radiation heating tubes.

[0011] Further optimization, the U-shaped radiation heating tubes are arranged on the left and right side walls of the inner shell of the high temperature zone, and the distance between adjacent U-shaped radiation heating tubes on the same side is 1-2m.

[0012] Further optimized, the heating component also includes circulating axial flow fans arranged on both sides of the high temperature zone.

[0013] Among them, the cooling component includes a condenser, a rotary dehumidifier and an induced draft fan, the induced draft fan is arranged on the top of the shell, the condenser is connected to the rotary dehumidifier, and the rotary dehumidifier is connected to the induced draft fan; a first circulating axial flow fan is arranged on one side of the low temperature zone.

[0014] Among them, the crusher is a hammer-type JF crusher.

[0015] It is further defined that the conveyor is a scraper conveyor.

[0016] Among them, there are multiple belt conveyor assemblies, each of which includes a conveyor belt, a first transmission wheel and a second transmission wheel, and the conveyor belt is wound around the first transmission wheel and the second transmission wheel; multiple belt conveyor assemblies are arranged in sequence from top to bottom; the feed end of the rear belt conveyor assembly exceeds the feed end of the previous belt conveyor assembly by 20-30cm; the cloth device is connected to a driving device, and the driving device is used to drive the cloth device to move upward, downward, left and right; each belt conveyor assembly corresponds to a cutting device.

[0017] The belt in the belt conveyor assembly is composited by one or more of polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polyimide (PI), and glass fiber.

[0018] Wherein, when glass fiber is used for compounding, the amount of glass fiber added is 10% to 40%.

[0019] In addition, the present invention also discloses a production method for preparing polyphosphate using the above production system, and the specific steps are as follows:

[0020] Step 1: Mix the raw materials and additives uniformly in proportion in a pre-mixer;

[0021] Step 2: The liquid material obtained after uniform mixing in the pre-mixer is uniformly sprayed on the belt conveyor assembly of the polymerization reactor through the distribution device, and under the action of the belt conveyor assembly, it enters the high temperature zone of the polymerization reactor to react for 0.5-2h; then enters the low temperature zone of the polymerization reactor to cool, completing the polymer curing process;

[0022] Step 3: The solidified and cooled polyphosphate is scraped off by a cutting device, and the scraped polyphosphate enters a pulverizer for pulverization;

[0023] Step 4: The crushed polyphosphate enters the packaging machine for packaging.

[0024] Further optimization, the temperature in the high temperature zone is 100-400°C; the temperature in the low temperature zone is 20-90°C.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The invention mainly consists of a premixer, a polymerization reactor, a material distribution device, a cutting device, a pulverizer, a conveyor and a packaging machine. The raw materials are put into the premixer for mixing. Then, under the action of a feeding pump and a material distribution device, the liquid material in the premixer is uniformly sprayed on a belt conveyor component in the polymerization reactor. Under the action of the belt conveyor component, the liquid material first enters the high-temperature zone of the polymerization reactor for polycondensation reaction. Then, the liquid material is cooled and solidified in the low-temperature zone of the polymerization reactor. The cooled and solidified product is scraped off from the belt conveyor component under the action of a cutting device. The detached product is transported to a pulverizer under the action of a conveyor for pulverization. Then, the pulverized polyphosphate is transported to a hopper for temporary storage by the conveyor. The product is packaged by a packaging machine. The automatic production of the product can be realized, and the product has the advantage of a high degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the production system of the present invention.

[0029] Figure 2 It is a schematic diagram of the overall structure of the polymerization reactor described in the present invention.

[0030] Figure 3 It is a schematic diagram of the overall structure of the driving device of the present invention.

[0031] Figure numerals: 1-premixer, 2-polymerization reactor, 3-distributing device, 4-cutting device, 5-crusher, 6-conveyor, 7-packaging machine, 8-feeding pump, 9-housing, 10-insulating partition, 11-high temperature zone, 12-low temperature zone, 13-heating component, 14-cooling component, 15-belt conveyor component, 16-U-shaped radiation heating tube, 17-heat transfer fins, 18-circulating axial flow fan, 19-condenser, 20-rotary dehumidifier, 21-induced draft fan, 22-conveyor belt, 23-first transmission wheel, 24-second transmission wheel, 25-driving device, 26-lateral driving component, 27-vertical driving component, 28-bracket, 29-screw, 30-slider, 31-guide rod, 32-motor, 33-cylinder, 34-hopper. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with embodiments, which are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in the field without creative work are all within the scope of protection of the present invention.

[0033] Embodiment 1

[0034] See also Figure 1-Figure 3 The present invention discloses a production system of polyphosphate, including a premixer 1, a polymerization reactor 2, a material distribution device 3, a cutting device 4, a pulverizer 5, a conveyor 6 and a packaging machine 7. The outlet of the premixer 1 is connected to the material distribution device 3 through a feeding pump 8. The polymerization reactor 2 includes a shell 9, a high temperature zone 11 and a low temperature zone 12 arranged in the shell 9, and a belt conveyor assembly 15 arranged in the shell 9. A heat preservation partition 10 is arranged in the shell 9. The heat preservation partition 10 divides the shell 9 into two parts, one part is the high temperature zone 11, and the other end is the A heating assembly 13 is provided in the low temperature zone 12 and the high temperature zone 11, and a cooling assembly 14 is provided in the low temperature zone 12; the distribution device 3 is located above the belt conveyor assembly 15 of the polymerization reactor 2; the cutting device 4 is provided at the end of the belt conveyor assembly 15 for scraping the solidified polyphosphate from the belt conveyor assembly 15; the crusher 5 is provided below the cutting device 4 and is used to crush the scraped polyphosphate, and the discharge port of the crusher 5 is connected to the hopper 34 through the conveyor 6, and the packaging machine 7 is provided at the discharge port of the hopper 34.

[0035] The present invention mainly consists of a premixer 1, a polymerization reactor 2, a material distribution device 3, a cutting device 4, a pulverizer 5, a conveyor 6 and a packaging machine 7. The raw materials are put into the premixer 1 for mixing. Then, under the action of a feeding pump 8 and a material distribution device 3, the liquid material in the premixer 1 is uniformly sprayed on a belt conveyor assembly 15 in the polymerization reactor 2. Under the action of the belt conveyor assembly 15, the liquid material first enters the high temperature zone 11 of the polymerization reactor 2 for polycondensation reaction, and then cools and solidifies in the low temperature zone 12 of the polymerization reactor 2. The cooled and solidified product is scraped off from the belt conveyor assembly 15 under the action of the cutting device 4. The fallen product is transported to the pulverizer 5 under the action of the conveyor 6 for pulverization. Then, the pulverized polyphosphate is sent to the hopper 34 by the conveyor 6 for temporary storage, and the packaging machine 7 is used to package the product. The automatic production of the product can be realized, and the product has the advantage of high automation.

[0036] The premixer 1 is a SD type static mixer, which can make the input materials be mixed more evenly.

[0037] In actual use, the premixer may also be an SMX type, SMV type, or SK type static mixer.

[0038] Further optimization, in this embodiment, the distributing device 3 is a swinging distributing device, so that the thickness can be more uniform when it is sprayed on the belt conveyor assembly 15, making the quality of the product formed after the reaction more uniform.

[0039] The heating assembly 13 includes a plurality of U-shaped radiation heating tubes 16 using natural gas as fuel and arranged in the high temperature zone 11. A plurality of heat transfer fins 17 are arranged at intervals on the U-shaped radiation heating tubes 16. In actual use, natural gas is used as fuel, and a continuous control method is used to ensure that the surface temperature of the U-shaped radiation heating tubes 16 is uniform, while reducing the emission of smoke.

[0040] Further optimization, the U-shaped radiation heating tubes 16 are arranged on the left and right side walls of the inner shell 9 of the high temperature zone 11, and the distance between adjacent U-shaped radiation heating tubes 16 on the same side is 1-2m; such an arrangement can improve the heat transfer efficiency.

[0041] Further optimized, the heating component 13 also includes circulating axial flow fans 18 arranged on both sides of the high temperature zone 11; thus, in actual use, the circulating axial flow fans 18 can make the temperature distribution of the hot air in the high temperature zone 11 more uniform, so that the material is heated better and its normal reaction is ensured.

[0042] The cooling assembly 14 includes a condenser 19, a rotary dehumidifier 20 and an induced draft fan 21. The induced draft fan 21 is arranged on the top of the shell 9. The condenser 19 is connected to the rotary dehumidifier 20, and the rotary dehumidifier 20 is connected to the induced draft fan 21. A first circulating axial flow fan 18 is arranged on one side of the low temperature zone 12.

[0043] In this way, the material is cooled and solidified by air in the low temperature zone 12, and the external air enters the rotary dehumidifier 20 after passing through the condenser 19, and then enters the low temperature cooling section of the polymerization reactor 2 after dehumidification. The humidity of the air is controlled below 12% after the rotary dehumidification. At the same time, an axial flow circulation fan is installed on one side of the low temperature zone 12 to ensure uniform distribution of the cold air.

[0044] Among them, the pulverizer 5 is a hammer-type JF type pulverizer 5.

[0045] Among them, the conveyor 6 is a scraper conveyor 6.

[0046] Embodiment 2

[0047] This embodiment is further optimized on the basis of the first embodiment. In this embodiment, there are multiple belt conveyor assemblies 15, each of which includes a conveyor belt 22, a first transmission wheel 23 and a second transmission wheel 24, and the conveyor belt 22 is wound around the first transmission wheel 23 and the second transmission wheel 24; multiple belt conveyor assemblies 15 are arranged in sequence from top to bottom; the feed end of the rear belt conveyor assembly 15 exceeds the feed end of the previous belt conveyor assembly 15 by 20-30 cm; the cloth device 3 is connected to a driving device 25, and the driving device 25 is used to drive the cloth device 3 to move upward, downward, leftward and rightward; each belt conveyor assembly 15 corresponds to a cutting device 4.

[0048] The driving device 25 includes a transverse driving component 26 and a vertical driving component 27 installed on the transverse driving component 26, and the material distribution device 3 is arranged on the vertical driving component;

[0049] The lateral driving assembly 26 is used to drive the vertical driving assembly 27 and the material distributing device 3 to move left and right; the vertical driving assembly 27 is used to drive the material distributing device 3 to move up and down.

[0050] The specific structure of the lateral drive assembly 26 is further described as follows:

[0051] The transverse drive assembly 26 includes a bracket 28, a screw 29 installed on the bracket 28, and a slider 30 slidably arranged on the screw 29. The slider 30 is provided with a guide hole, and the bracket 28 is provided with a guide rod 31. The guide hole and the guide rod 31 cooperate with each other. A motor 32 is installed on the bracket 28, and the motor 32 is connected to the screw 29.

[0052] The vertical drive assembly 27 includes a cylinder 33 and an air pump connected to the cylinder 33 . The movable end of the cylinder 33 is connected to the material distribution device 3 , and the fixed end of the cylinder 33 is fixedly mounted on the slider 30 .

[0053] Thus, in actual use, the position of the material distributing device 3 can be adjusted by the transverse drive assembly 26 and the vertical drive assembly 27, thereby achieving the purpose of distributing materials to different belt conveyor assemblies 15, which can effectively improve the synthesis efficiency of polyphosphate.

[0054] The belt in the belt conveyor assembly 15 is composited by one or more of polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK), polyimide (PI), and glass fiber.

[0055] Further optimization, when glass fiber is used for composite, the amount of glass fiber added is 10% to 40%.

[0056] Embodiment 3

[0057] This embodiment discloses a method for producing polyphosphate, comprising the following steps:

[0058] Step 1: uniformly mix the raw materials and additives in a premixer 1 according to proportion;

[0059] Step 2: The liquid material obtained after uniform mixing in the premixer 1 is uniformly sprayed on the belt conveyor assembly 15 of the polymerization reactor 2 through the distribution device 3, and under the action of the belt conveyor assembly 15, it enters the high temperature zone 11 in the polymerization reactor 2 to react for 0.5-2h; then enters the low temperature zone 12 in the polymerization reactor 2 to cool, completing the polymer curing process;

[0060] Step 3: The solidified and cooled polyphosphate is scraped off by a cutting device 4, and the scraped polyphosphate enters a pulverizer 5 for pulverization;

[0061] Step 4: The crushed polyphosphate enters the packaging machine 7 for packaging.

[0062] Further optimization, the temperature in the high temperature zone 11 is 100-400°C; the temperature in the low temperature zone 12 is 20-90°C; further definition, in this embodiment, the temperature in the high temperature zone 11 is 300°C; the temperature in the low temperature zone 12 is 70°C.

[0063] In the actual production process, the crushing, conveying and packaging processes are arranged in a relatively closed independent workshop, in which a rotary dehumidifier 20 is installed, and the air humidity is controlled below 20%.

[0064] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for producing a polyphosphate, characterized in that: The invention comprises a production system using the following structure, including a pre-mixer, a polymerization reactor, a material distribution device, a cutting device, a pulverizer, a conveyor and a packaging machine, wherein the outlet of the pre-mixer is connected to the material distribution device through a feeding pump, the polymerization reactor comprises a shell, a high temperature zone and a low temperature zone arranged in the shell, and a belt conveyor assembly arranged in the shell, a heat preservation partition is arranged in the shell, and the heat preservation partition divides the shell into two parts, one part is the high temperature zone, and the other end is the low temperature zone, a heating assembly is arranged in the high temperature zone, and a cooling assembly is arranged in the low temperature zone; the material distribution device is located above the belt conveyor assembly of the polymerization reactor; the cutting device is arranged at the end of the belt conveyor assembly for scraping the solidified polyphosphate from the belt conveyor assembly; the pulverizer is arranged below the cutting device and is used to crush the scraped polyphosphate, the material outlet of the pulverizer is connected to a hopper through the conveyor, and the packaging machine is arranged at the material outlet of the hopper; The specific preparation process is as follows: Step 1: Mix the raw materials and additives uniformly in proportion in a pre-mixer; Step 2: The liquid material obtained after uniform mixing in the pre-mixer is uniformly sprayed on the belt conveyor assembly of the polymerization reactor through the distribution device, and under the action of the belt conveyor assembly, it enters the high temperature zone of the polymerization reactor to react for 0.5-2h; then enters the low temperature zone of the polymerization reactor to cool, completing the polymer curing process; Step 3: The solidified and cooled polyphosphate is scraped off by a cutting device, and the scraped polyphosphate enters a pulverizer for pulverization; Step 4: The crushed polyphosphate enters the packaging machine for packaging; There are multiple belt conveyor assemblies, which are arranged in sequence from top to bottom; the feed end of the latter belt conveyor assembly exceeds the feed end of the former belt conveyor assembly by 20-30 cm; The material distributing device is connected to a driving device, and the driving device is used to drive the material distributing device to move upward, downward, leftward and rightward; each belt conveying assembly corresponds to a cutting device; The driving device includes a transverse driving assembly and a vertical driving assembly installed on the transverse driving assembly, and the material distribution device is arranged on the vertical driving assembly; the transverse driving assembly is used to drive the vertical driving assembly and the material distribution device to move left and right; the vertical driving assembly is used to drive the material distribution device to move up and down; The position of the material distributing device is adjusted by the lateral drive assembly and the vertical drive assembly, thereby achieving the purpose of distributing materials to different belt conveyor assemblies, which can effectively improve the synthesis efficiency of polyphosphate; The material distributing device is a swinging material distributing device.

2. The method for producing a polyphosphate according to claim 1, characterized in that: The temperature in the high temperature zone is 100-400℃; the temperature in the low temperature zone is 20-90℃.

3. The method for producing a polyphosphate according to claim 2, characterized in that: The heating assembly comprises a plurality of U-shaped radiation heating tubes which are arranged in a high temperature zone and use natural gas as fuel, and a plurality of heat transfer fins are arranged at intervals on the U-shaped radiation heating tubes.

4. The method for producing a polyphosphate according to claim 3, characterized in that: The U-shaped radiation heating tubes are arranged on the left and right side walls of the inner shell of the high temperature zone, and the distance between adjacent U-shaped radiation heating tubes on the same side is 1-2m.

5. The method for producing a polyphosphate according to claim 1, characterized in that: The cooling assembly includes a condenser, a rotary dehumidifier and an induced draft fan. The induced draft fan is arranged on the top of the shell. The condenser is connected to the rotary dehumidifier, and the rotary dehumidifier is connected to the induced draft fan. A first circulating axial flow fan is arranged on one side of the low temperature zone.

6. The method for producing a polyphosphate according to claim 1, characterized in that: The crusher is a hammer type JF crusher.

7. The method for producing a polyphosphate according to claim 1, characterized in that: The conveyor is a scraper conveyor.

8. The method for producing a polyphosphate according to claim 1, characterized in that: The premixer is a SMX, SMV, SD or SK static mixer.

Images