CN217025352U - Device for continuously producing sodium trimetaphosphate by two-step method - Google Patents
Device for continuously producing sodium trimetaphosphate by two-step method Download PDFInfo
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- CN217025352U CN217025352U CN202122992966.6U CN202122992966U CN217025352U CN 217025352 U CN217025352 U CN 217025352U CN 202122992966 U CN202122992966 U CN 202122992966U CN 217025352 U CN217025352 U CN 217025352U
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Abstract
The utility model provides a device for continuously producing sodium trimetaphosphate by a two-step method, which comprises a neutralization kettle, wherein the neutralization kettle is used for generating a sodium dihydrogen phosphate solution; a spray drying tower connected with the neutralization kettle; a horizontal polymerization furnace connected to the spray drying tower; the hot blast stove is connected with the horizontal polymerization furnace; and the post-treatment unit is connected with the horizontal polymerization furnace. The device can greatly reduce the energy consumption of the sodium trimetaphosphate production, the production process is continuously closed, and the environmental pollution is avoided; the sodium trimetaphosphate prepared by the device has higher purity and stable quality.
Description
Technical Field
The utility model belongs to the technical field of sodium trimetaphosphate preparation, and particularly relates to a device for continuously producing sodium trimetaphosphate by a two-step method.
Background
Sodium trimetaphosphate is usually a white solid and has a density of 2.54g/cm3Easily soluble in water, melting point 627.6 deg.C, molecular formula Na3(PO3)3The preparation method is used for preparing the vitamin C tripolyphosphate for the fish and livestock feed; manufacturing a detergent by a steam expansion method; and (3) manufacturing modified starch.
Sodium trimetaphosphate is stable Na3(PO3)3Form I, also known as Coulol salt. Method for producing sodium trimetaphosphate in China at presentThe method comprises two main processes, namely a sodium hexametaphosphate annealing process, namely neutralizing phosphoric acid and sodium carbonate or sodium hydroxide to obtain a neutralization value, feeding the neutralization value into a polymerization furnace to be dehydrated and melted into sodium metaphosphate, quenching the neutralization value, feeding the obtained product into a tempering furnace to perform depolymerization at the temperature of 520-540 ℃, cooling and crushing the product into a sodium trimetaphosphate product. The production method has the advantages of simple process and easy operation. The method has the disadvantages that the production mode is indirect, the production scale is small, the energy consumption is high, and the neutralized sodium dihydrogen phosphate slurry is sent into a high-temperature furnace for polymerization at 800-1050 ℃ for fusion reaction, so that the method has high requirements on equipment on high temperature resistance and corrosion resistance, and has large potential safety hazard and high energy consumption.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a device for continuously producing sodium trimetaphosphate by a two-step method, wherein the device can continuously produce sodium trimetaphosphate.
The utility model provides a device for continuously producing sodium trimetaphosphate by a two-step method, which comprises a neutralization kettle, wherein the neutralization kettle is used for generating a sodium dihydrogen phosphate solution;
a spray drying tower connected with the neutralization kettle;
a horizontal polymerization furnace connected to the spray drying tower;
the hot blast stove is connected with the horizontal polymerization furnace;
and the post-treatment unit is connected with the horizontal polymerization furnace.
In the present invention, the post-treatment unit comprises a cooling drum connected to the horizontal polymerization furnace;
a crushing unit connected to the cooling drum;
and the collecting unit is connected with the crushing unit.
In the utility model, the solid sodium dihydrogen phosphate conveyed out by the spray drying tower is continuously conveyed into a rotary horizontal polymerization furnace by adopting a screw conveyor and a bucket elevator.
In the present invention, the spray drying tower is a space where the material mist and hot air or combustion gas mainly contact and the moisture is evaporated. The spray drying tower had an internal diameter of 9m, a cylindrical section height of 10.98m and a cone angle of 50 °. The inner container of the spray drying tower is 3162.5 mm, the outer lining is reinforced by angle steel, and the heat preservation thickness is 100 mm. The lower half part of the spray drying tower is provided with a reducing feed opening with the diameter of phi 1000 mm.
In the utility model, a hot air distributor is arranged at the top of the spray drying tower. The hot air distributor adopts the form of logarithmic spiral to supply air, so that the hot air uniformly enters the drying tower after being thermally sealed. Still be equipped with in the drying tower and clean door and illumination hole, be convenient for observe, clear up the drying tower body.
The high-speed centrifugal atomizer is the core equipment of a spray drying tower, and the high-speed centrifugal atomizer adopted by the utility model is an LPG-3000 nonstandard atomizer.
In the utility model, a first cyclone dust collector and a first bag-type dust collector which are sequentially connected with a tail gas outlet of the horizontal polymerization furnace; and the anhydrous sodium dihydrogen phosphate collected by the first cyclone dust collector and the first bag-type dust collector is fed into the horizontal polymerization furnace again. The tail gas of the horizontal polymerization furnace can bring away part of solid sodium dihydrogen phosphate powder, and the solid sodium dihydrogen phosphate powder is collected by a first cyclone dust collector and a first bag-type dust collector to obtain anhydrous sodium dihydrogen phosphate; then the mixture is sent into the horizontal polymerization furnace again by a screw conveyor and a bucket elevator.
In the utility model, a second cyclone dust collector and a second bag-type dust collector are sequentially connected with the crushing unit;
and the second cyclone dust collector and the second bag-type dust collector both collect sodium trimetaphosphate.
The key equipment in the device for continuously producing sodium trimetaphosphate by the two-step method provided by the utility model is a spray drying tower, and the heat transfer principle of the spray drying tower is as follows: the air passes through the filter and heater and enters the air distributor at the top of the spray dryer, and the hot air enters the dryer uniformly in a spiral shape. The feed liquid is pumped to the atomizer on the top of the dryer from the feed liquid tank through the filter, so that the feed liquid is sprayed into extremely small fog-like liquid drops, the feed liquid and hot air are in parallel flow contact, the moisture is rapidly evaporated, the feed liquid is dried into a finished product in an extremely short time, the finished product is discharged from the bottom of the drying tower and the cyclone separator, and the waste gas is discharged by the fan after being dedusted by the dedusting device. The production process is simplified, the continuous control production is suitable, the liquid with the moisture content of 40-90% is dried into powder at one time, the procedures of crushing, screening and the like are reduced, the product purity is improved, the product dispersibility, the flowability and the solubility are good, the particle size and the looseness of the product are good, and the water content is adjustable in a certain range. The inlet air temperature is only 280-350 ℃, and the waste heat generated in the production of other production lines can be used for drying. The water content of the prepared solid sodium dihydrogen phosphate intermediate product is 2-5%, the exhaust gas emission temperature is below 100 ℃, heat energy is fully utilized, and the heat efficiency is greatly improved. Compared with the traditional manufacturing process, the energy can be saved by 40-60%.
The product prepared by the device provided by the utility model has high content and stable quality: because the dehydration polymerization process of sodium dihydrogen phosphate intermediate product is gone on in constantly pivoted polymerization furnace, the material gets into from the furnace end, and the furnace tail flows out, and steam is then opposite. The materials are continuously turned over in the material-turning device, so that the temperature of the materials with the same section is completely consistent, and the stability of the product quality is ensured. Similarly, the temperature of the material with the same section can be easily controlled at the required process temperature, so that a high-content product is prepared, and the purity of the product can reach more than 99%. And (3) sending the product flowing out of the tail part of the horizontal polymerization furnace into a cooling roller for cooling, and then crushing and packaging. The whole process is in a continuous closed state, so that the product quality is strictly ensured.
The utility model provides a method for continuously preparing sodium trimetaphosphate by a two-step method, which comprises the following steps:
reacting phosphoric acid solution with sodium carbonate solution or sodium hydroxide solution to obtain sodium dihydrogen phosphate solution;
atomizing the sodium dihydrogen phosphate solution to evaporate water to obtain solid sodium dihydrogen phosphate with the water content of 2-5 wt%;
and (3) reversely contacting the solid sodium dihydrogen phosphate with the water content of 2-5 wt% with combustion gas or hot air at 560-600 ℃, continuously dehydrating, and polymerizing to obtain the sodium trimetaphosphate.
The utility model adopts atomization evaporation drying, water is evaporated and removed in the drying process, and material dust can be discharged after being collected by the bag-type dust collector. Materials participating in polymerization in the horizontal polymerization furnace are relatively wet, thick and heavy, dust is not easy to generate, a small amount of powder brought out is collected by the bag-type dust collector, and then the powder enters the horizontal polymerization furnace again through the screw conveyor and the bucket elevator, so that clean and environment-friendly production is achieved.
In the utility model, the specific gravity of the sodium dihydrogen phosphate solution is 1.4-1.8 g/cm3The pH value is 4.2-4.6.
In the utility model, the temperature of the combustion gas is 560-600 ℃; the temperature of the hot air is 280-350 ℃.
FIG. 1 is a schematic view of an apparatus for continuously producing sodium trimetaphosphate by a two-step method provided by the utility model. The method for producing sodium trimetaphosphate by using the device shown in figure 1 comprises the following steps:
A. preparation of sodium dihydrogen phosphate: reacting phosphoric acid and sodium carbonate or sodium hydroxide in a neutralization kettle to obtain sodium dihydrogen phosphate solution; B. heating and curing of sodium dihydrogen phosphate: the sodium dihydrogen phosphate solution is injected into a high-speed atomizer at the top of a spray drying tower, the surface area of the feed liquid is greatly increased after the feed liquid is atomized, hot air is blown in by an air blower and uniformly enters the drying tower, 95% -98% of water can be instantly evaporated, the drying time is only several seconds, solid sodium dihydrogen phosphate with the water content of 2% -5% is obtained, the countercurrent heat exchange with hot air is conveniently carried out in the next polymerization process, and a large amount of dust is not generated; C. preparation of sodium trimetaphosphate: continuously feeding the solid sodium dihydrogen phosphate into a rotary horizontal polymerization furnace, carrying out countercurrent heat exchange with combustion gas or hot air generated by a hot blast stove, continuously dehydrating, polymerizing at the high temperature of 560-600 ℃, generating sodium trimetaphosphate at the tail gas temperature of 150-200 ℃, cooling, crushing and collecting to obtain the sodium trimetaphosphate.
In addition, the temperature of the process provided by the utility model in a horizontal polymerization furnace is adjusted, so that different products can be obtained; the temperature is adjusted to 200-270 ℃, and sodium acid pyrophosphate with good quality can be obtained; the temperature of the polymerization part is adjusted to 150-200 ℃, so that a sodium dihydrogen phosphate finished product with better quality can be prepared, and the defect of high water content in the preparation of sodium dihydrogen phosphate by a spray drying method is overcome. The utility model adjusts the sodium-phosphorus ratio of the neutralization part (reaction of phosphoric acid solution and sodium carbonate solution or sodium hydroxide solution), and can also prepare products such as disodium hydrogen phosphate, trisodium phosphate, sodium pyrophosphate, sodium tripolyphosphate and the like.
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FIG. 1 is a schematic view of an apparatus for continuously producing sodium trimetaphosphate by a two-step method provided by the utility model.
Detailed Description
In order to further illustrate the present invention, the following will describe the apparatus for continuously producing sodium trimetaphosphate by two-step process in detail with reference to the following examples, which should not be construed as limiting the scope of the present invention.
Example 1
A. Preparation of sodium dihydrogen phosphate: reacting phosphoric acid and sodium carbonate or sodium hydroxide in a neutralization kettle to obtain sodium dihydrogen phosphate solution, wherein the specific gravity of the neutralization solution is controlled to be 1.4g/cm3The pH value is 4.6;
B. heating and curing of sodium dihydrogen phosphate: the sodium dihydrogen phosphate solution is injected into a high-speed atomizer at the top of a spray drying tower, the surface area of the feed liquid is greatly increased after the feed liquid is atomized, hot air is blown in by an air blower at 350 ℃, the hot air uniformly enters the drying tower, 98 percent of water is evaporated instantly, and solid sodium dihydrogen phosphate with the water content of 2 percent is obtained; the countercurrent heat exchange between the catalyst and hot air in the next polymerization process is facilitated, so that a large amount of dust is not generated;
C. preparation of sodium trimetaphosphate: continuously feeding the solid sodium dihydrogen phosphate into a rotary horizontal polymerization furnace by using a screw conveyor, carrying out countercurrent heat exchange with combustion gas or hot air generated by a hot blast furnace, continuously dehydrating, generating sodium acid pyrophosphate at the temperature of 200-240 ℃, continuously advancing the sodium acid pyrophosphate under the action of gravity, generating sodium metaphosphate at the temperature of 300-350 ℃, continuously advancing the sodium metaphosphate under the action of gravity, polymerizing at the high temperature of 560 ℃ to generate sodium trimetaphosphate, cooling and crushing the sodium trimetaphosphate at the tail gas temperature of 150 ℃, collecting, and packaging to obtain a finished product of the sodium trimetaphosphate; meanwhile, about 5 percent of sodium dihydrogen phosphate solid powder taken away by tail gas of the horizontal polymerization furnace is collected by a cyclone dust collector and a bag-type dust collector to obtain anhydrous sodium dihydrogen phosphate, and the yield of the sodium trimetaphosphate can reach 99.8 percent; then the mixture is sent into the horizontal polymerization furnace again by a screw conveyor and a bucket elevator.
TABLE 1 physicochemical parameters of sodium trimetaphosphate prepared in example 1
| Inspection item | Standard provisions | The result of the detection |
| Purity (%) | ≥99 | 99.2 |
| Water-insoluble substance (%) | ≤1 | 0.2 |
| Value of ph | 6.0-9.0 | 6.8 |
| Fineness (80 mesh screen,%) | ≤15 | 9 |
Example 2
A. Preparation of sodium dihydrogen phosphate: reacting phosphoric acid and sodium carbonate or sodium hydroxide in a neutralization kettle to obtain sodium dihydrogen phosphate solution, and controlling the specific gravity of the neutralization solution to be 1.6g/cm3The pH value is 4.4;
B. heating and curing of sodium dihydrogen phosphate: the sodium dihydrogen phosphate solution is injected into a high-speed atomizer at the top of a spray drying tower, the surface area of the feed liquid is greatly increased after the feed liquid is atomized, hot air with the temperature of 320 ℃ is blown in by an air blower and uniformly enters the drying tower, 97 percent of water is instantly evaporated, and solid sodium dihydrogen phosphate with the water content of 3 percent is obtained; the heat exchange with hot air in the next polymerization process is carried out in a countercurrent way, so that a large amount of dust is not generated;
C. preparation of sodium trimetaphosphate: continuously feeding the solid sodium dihydrogen phosphate into a rotary horizontal polymerization furnace by a screw conveyor, carrying out countercurrent flow heat exchange with combustion gas or hot air generated by a hot blast furnace, continuously dehydrating, generating sodium acid pyrophosphate at the temperature of 200-240 ℃, continuously advancing under the action of gravity, generating sodium metaphosphate at the temperature of 300-350 ℃, continuously advancing under the action of gravity, polymerizing at the high temperature of 580 ℃, generating sodium trimetaphosphate at the temperature of tail gas of 180 ℃, cooling, crushing, collecting and packaging to obtain a finished product of the sodium trimetaphosphate; meanwhile, after sodium dihydrogen phosphate solid powder taken away by tail gas of the horizontal polymerization furnace is collected by a cyclone dust collector and a bag-type dust collector, anhydrous sodium dihydrogen phosphate can be obtained, and the yield of sodium trimetaphosphate can reach 99.8%; then the mixture is sent into the horizontal polymerization furnace again by a screw conveyor and a bucket elevator.
TABLE 2 physicochemical parameters of sodium trimetaphosphate prepared in example 2
| Inspection item | Standard provisions | The result of the detection |
| Purity (%) | ≥99 | 99.5 |
| Water-insoluble substance (%) | ≤1 | 0.1 |
| pH value | 6.0-9.0 | 6.8 |
| Fineness (80 mesh screen,%) | ≤15 | 9 |
Example 3
A. Preparation of sodium dihydrogen phosphate: reacting phosphoric acid and sodium carbonate or sodium hydroxide in a neutralization kettle to obtain sodium dihydrogen phosphate solution, and controlling the specific gravity of the neutralization solution to be 1.8g/cm3The pH value is 4.2;
B. heating and curing of sodium dihydrogen phosphate: the sodium dihydrogen phosphate solution is injected into a high-speed atomizer at the top of a spray drying tower, the surface area of the feed liquid is greatly increased after the feed liquid is atomized, hot air is blown in by an air blower at 280 ℃, the hot air uniformly enters the drying tower, 95% of water is instantly evaporated, and solid sodium dihydrogen phosphate with the water content of 5% is obtained; the heat exchange with hot air in the next polymerization process is carried out in a countercurrent way, so that a large amount of dust is not generated;
C. preparation of sodium trimetaphosphate: continuously feeding the solid sodium dihydrogen phosphate into a rotary horizontal polymerization furnace by using a screw conveyor, carrying out countercurrent heat exchange with combustion gas or hot air generated by a hot blast stove, continuously dehydrating, generating sodium acid pyrophosphate at 200-240 ℃, continuously advancing the sodium acid pyrophosphate under the action of gravity, generating sodium metaphosphate at 300-350 ℃, continuously advancing the sodium metaphosphate under the action of gravity, polymerizing at a high temperature of 600 ℃, generating sodium trimetaphosphate at a tail gas temperature of 200 ℃, cooling, crushing, collecting and packaging to obtain a finished product of the sodium trimetaphosphate; meanwhile, after sodium dihydrogen phosphate solid powder taken away by tail gas of the horizontal polymerization furnace is collected by a cyclone dust collector and a bag-type dust collector, anhydrous sodium dihydrogen phosphate can be obtained, and the yield of sodium trimetaphosphate can reach 99.8%; then the mixture is sent into the horizontal polymerization furnace again by a screw conveyor and a bucket elevator.
TABLE 3 physicochemical parameters of sodium trimetaphosphate prepared in example 3
| Inspection item | Standard provisions | The result of the detection |
| Purity (%) | ≥99 | 99.8 |
| Water-insoluble substance (%) | ≤1 | 0.05 |
| pH value | 6.0-9.0 | 6.8 |
| Fineness (80 mesh screen,%) | ≤15 | 9 |
From the above embodiments, the present invention provides a two-step continuous production apparatus of sodium trimetaphosphate, which comprises a neutralization kettle, a sodium phosphate solution generator, a sodium phosphate storage tank and a sodium phosphate storage tank, wherein the neutralization kettle is used for generating sodium dihydrogen phosphate solution; a spray drying tower connected with the neutralization kettle; a horizontal polymerization furnace connected to the spray drying tower; the hot blast stove is connected with the horizontal polymerization furnace; and the post-treatment unit is connected with the horizontal polymerization furnace. The device can greatly reduce the energy consumption of the sodium trimetaphosphate production, the production process is continuously closed, and the environmental pollution is avoided; the sodium trimetaphosphate prepared by the device has higher purity and stable quality. The experimental results show that: the yield of the sodium trimetaphosphate can reach 99.8 percent, and the purity thereof can reach 99.8 percent.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The device for continuously producing the sodium trimetaphosphate by the two-step method is characterized by comprising a neutralization kettle, wherein the neutralization kettle is used for generating a sodium dihydrogen phosphate solution;
a spray drying tower connected with the neutralization kettle;
a horizontal polymerization furnace connected to the spray drying tower;
the hot blast stove is connected with the horizontal polymerization furnace;
and the post-treatment unit is connected with the horizontal polymerization furnace.
2. The apparatus according to claim 1, wherein the post-treatment unit comprises a cooling drum connected to the horizontal polymerization furnace;
a crushing unit connected to the cooling drum;
and the collecting unit is connected with the crushing unit.
3. The apparatus according to claim 1, wherein a first cyclone dust collector and a first bag-type dust collector are sequentially connected with the tail gas discharge port of the horizontal polymerization furnace; and the anhydrous sodium dihydrogen phosphate collected by the first cyclone dust collector and the first bag-type dust collector is fed into the horizontal polymerization furnace again.
4. The apparatus according to claim 2, wherein a second cyclone and a second bag-type dust collector are sequentially connected to the pulverizing unit;
and the second cyclone dust collector and the second bag-type dust collector both collect sodium trimetaphosphate.
5. The apparatus of claim 1, wherein a hot air distributor is provided at the top of the spray drying tower.
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| CN113942989A (en) * | 2021-11-30 | 2022-01-18 | 泰山石膏有限公司 | Device and method for continuously producing sodium trimetaphosphate by two-step method |
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