CN104555964B - A kind of production method of acid potassium phosphate - Google Patents
A kind of production method of acid potassium phosphate Download PDFInfo
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- CN104555964B CN104555964B CN201510062871.0A CN201510062871A CN104555964B CN 104555964 B CN104555964 B CN 104555964B CN 201510062871 A CN201510062871 A CN 201510062871A CN 104555964 B CN104555964 B CN 104555964B
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Abstract
The present invention is a kind of production method of acid potassium phosphate, and the step that adopts phosphoric acid and potassium dihydrogen phosphate to prepare acid potassium phosphate is: phosphoric acid and potassium dihydrogen phosphate are added in reactor by step respectively, and phosphoric acid and potassium dihydrogen phosphate are 1:1 in molar ratio. After potassium dihydrogen phosphate dissolves completely, carry out cooling, crystallization, separation, dry to obtain acid potassium phosphate. The method that adopts phosphoric acid and potassium hydroxide to prepare acid potassium phosphate is, phosphoric acid and potassium hydroxide are added in reactor by step respectively, and wherein potassium hydroxide and phosphoric acid are 1:2 in molar ratio, after fully reacting, obtain neutralizer, the spray-dried acid potassium phosphate that makes. The invention solves acid potassium phosphate suitability for industrialized production problem. The present invention adopts conventional chemical industry equipment, industrial chemicals, produces acid potassium phosphate, because acid potassium phosphate has specific functionality, so this method has been filled up the blank of domestic market.
Description
Technical field
The present invention relates to the production method of acid potassium phosphate.
Background technology
Acid potassium phosphate is again potassium polyphposphate. Its molecular structural formula is: KH2PO4H3PO4; PH value 1.9 left and right.
Because acid potassium phosphate is highly acid, and it is water-soluble very good, thus can be applied on agricultural fertilizer,In agricultural, as a kind of new-type fertilizer, be specially adapted to the basic soil of water-saving drip irrigation. In use, can be by acid phosphorusAcid potassic fertilizer is soluble in water, then delivers to the place of needs fertilising by water pipe for drip irrigation, very convenient in the use.
First is in the poor heat stability of acid potassium phosphate, and hygroscopicity is extremely strong, so its production difficulty is large. Do not see at presentTo having about the bibliographical information that carries out in batches a large amount of production acid potassium phosphates.
Summary of the invention
In order to solve above-described deficiency, the invention provides the production method of acid potassium phosphate.
The production method of a kind of acid potassium phosphate of the present invention, is specially and adopts phosphoric acid and potassium dihydrogen phosphate to prepare acid phosphorusAcid potassium. And carry out as follows:
A, phosphoric acid is heated in reactor to 65 DEG C～95 DEG C.
B, potassium dihydrogen phosphate is slowly added in reactor, and continue to be heated to 80 DEG C in the process adding～150 DEG C.
The above-mentioned phosphoric acid adding and potassium dihydrogen phosphate are 1:1 in molar ratio.
C, continuous heating to potassium dihydrogen phosphate dissolve completely; Obtain lysate.
Lysate is inserted in crystallizer, carry out cooling and crystallization, then through separating, dry to obtain acid potassium phosphate.
The production method of acid potassium phosphate as above, further illustrate into, described lysate is after Crystallization SeparationThe mother liquor producing reclaims after concentrated, and adds reactor utilization.
The production method of another kind of acid potassium phosphate of the present invention, is specially and adopts phosphoric acid and potassium hydroxide to prepare acid phosphorusAcid potassium.
The production method of above-mentioned a kind of acid potassium phosphate, carry out as follows:
A, phosphoric acid is heated in reactor to 65 DEG C～95 DEG C.
B, potassium hydroxide is slowly added in reactor, and continue to be heated to 80 DEG C in the process adding～150 DEG C.
The above-mentioned potassium hydroxide adding and phosphoric acid are 1:2 in molar ratio.
C, continuous heating, to abundant reaction, obtain neutralizer.
D, the spray-dried acid potassium phosphate that makes of neutralizer.
Beneficial effect of the present invention:
The invention solves acid potassium phosphate (potassium polyphposphate) suitability for industrialized production problem.
The present invention adopts conventional chemical industry equipment, industrial chemicals, produces acid potassium phosphate, because acid potassium phosphate hasSpecific functionality, so this method has been filled up the blank of domestic market.
Brief description of the drawings
Fig. 1 is the process chart that adopts phosphoric acid and potassium dihydrogen phosphate production acid potassium phosphate.
Fig. 2 is the process chart that adopts phosphoric acid and potassium hydroxide production acid potassium phosphate.
Detailed description of the invention
Production principle of the present invention is as follows: in potassium hydroxide and phosphoric acid, be dried and generate acid potassium phosphate (polyphosphoric acid with sprayingPotassium):
KOH＋2H3PO4→KH2PO4·H3PO4＋H2O
Phosphoric acid and potassium dihydrogen phosphate heating generate acid potassium phosphate (potassium polyphposphate):
KH2PO4＋H3PO4→KH2PO4·H3PO4
The reactor using in the present invention is enamel or stainless steel making, in the time of the reactor that uses stainless steel to make,Add phosphoric acid finish after with add potassium dihydrogen phosphate before, the heating-up temperature of reactor can not exceed 95 DEG C.
The speed of throwing in potassium dihydrogen phosphate in the phosphatase reaction still to being equipped with after heating is unsuitable too fast, in launch process, stirsMix and can not stop, heating-up temperature can not exceed 150 DEG C.
Dryer is vibrating fluid bed dryer, and has cooling section, and in drying course, temperature is controlled at 50 DEG C～75 DEG C.
Spray dryer is made of stainless steel, and hot blast inlet temperature is controlled at 250 DEG C～350 DEG C, and exhaust temperature is controlled at130℃～150℃。
Below in conjunction with accompanying drawing and by specific embodiment, the invention will be further described.
Embodiment mono-:
Be used in phosphoric acid and potassium dihydrogen phosphate and prepare the way of acid potassium phosphate, as Fig. 1, its process is as follows:
Process 1:
In reactor, add phosphoric acid 3000kg (85% phosphoric acid) to be heated to 80 DEG C, slowly add potassium dihydrogen phosphate3545kg, heating while stirring in the process adding, after 3 hours, temperature is raised to 130 DEG C, in reactor, clarifiesViscous liquid, puts into crystallizer through cooling, crystallization, separation, the oven dry of 4 hours, obtains acid potassium phosphate (polyphosphoric acidPotassium) product 3485kg.
Its quality is:
Potassium dihydrogen phosphate is the phosphoric acid rate of recovery 57.24% for the first time of the rate of recovery 57.23%, 85% for the first time.
Process 2:
Centrifugation mother liquor out in process 1 is returned in reactor and heated after concentrated 3 hours, add phosphatase 11 500kg(85% phosphoric acid) is heated to 80 DEG C, slowly adds potassium dihydrogen phosphate 1773kg, heating while stirring in the process adding, warpAfter spending 2.5 hours, temperature is raised to 140 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer through 4.5 hoursCooling, crystallization, separation, oven dry, obtain acid potassium phosphate (potassium polyphposphate) product 3264kg. Its quality is:
Potassium dihydrogen phosphate for the second time the rate of recovery 107.58%, 85% phosphoric acid for the second time in rate of recovery 107.19%(process 1 fromThe heart is isolated the potassium dihydrogen phosphate in mother liquor, 85% phosphoric acid part enters product).
Process 3:
Centrifugation mother liquor out in process 2 is returned in reactor and heated after concentrated 3 hours, add phosphatase 11 500kg(85% phosphoric acid) is heated to 80 DEG C, slowly adds potassium dihydrogen phosphate 1773kg, heating while stirring in the process adding, warpAfter spending 2.5 hours, temperature is raised to 132 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer through 4 hoursCooling, crystallization, separation, oven dry, obtain acid potassium phosphate (potassium polyphposphate) product 3064kg. Its quality is:
Potassium dihydrogen phosphate for the third time the rate of recovery 100.62%, 85% phosphoric acid for the third time in rate of recovery 100.99%(process 1 fromThe heart is isolated the potassium dihydrogen phosphate in mother liquor, 85% phosphoric acid part enters product).
Process 4:
Centrifugation mother liquor out in embodiment 3 is returned in reactor and heated after concentrated 3 hours, add phosphoric acid1500kg (85% phosphoric acid) is heated to 87 DEG C, slowly adds potassium dihydrogen phosphate 1773kg, in the process adding while stirringHeating, after 3 hours, temperature is raised to 143 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer through 4Hour cooling, crystallization, separation, oven dry, obtain acid potassium phosphate (potassium polyphposphate) product 3022kg. Its quality is:
The 4th rate of recovery 99.60% of phosphoric acid of the 4th rate of recovery 99.24%, 85% of potassium dihydrogen phosphate.
Process 5:
Centrifugation mother liquor out in process 4 is returned in reactor and heated after concentrated 3.5 hours, add phosphoric acid1800kg (85% phosphoric acid) is heated to 95 DEG C, slowly adds potassium dihydrogen phosphate 2127kg, in the process adding while stirringHeating, after 3.5 hours, temperature is raised to 138 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer processCooling, crystallization, separation, the oven dry of 4.5 hours, obtain acid potassium phosphate (potassium polyphposphate) product 3485kg. Its quality is:
The 5th rate of recovery 95.39% of phosphoric acid of the 5th rate of recovery 95.41%, 85% of potassium dihydrogen phosphate.
Process 6:
Centrifugation mother liquor out in process 5 is returned in reactor and heated after concentrated 3.5 hours, add phosphoric acid1800kg (85% phosphoric acid) is heated to 89 DEG C, slowly adds potassium dihydrogen phosphate 2127kg, in the process adding while stirringHeating, after 3 hours, temperature is raised to 128 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer processCooling, crystallization, separation, the oven dry of 4.5 hours, obtain acid potassium phosphate (potassium polyphposphate) product 3585kg. Its quality is:
The 6th rate of recovery 98.14% of phosphoric acid of the 6th rate of recovery 98.13%, 85% of potassium dihydrogen phosphate.
Process 7:
Centrifugation mother liquor out in process 6 is returned in reactor and heated after concentrated 3 hours, add phosphatase 11 800kg(85% phosphoric acid) is heated to 84 DEG C, slowly adds potassium dihydrogen phosphate 2127kg, heating while stirring in the process adding, warpAfter spending 3.5 hours, temperature is raised to 142 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer through 4.5 hoursCooling, crystallization, separation, oven dry, obtain acid potassium phosphate (potassium polyphposphate) product 3523kg. Its quality is:
The 7th rate of recovery 96.45% of phosphoric acid of the 7 seven rate of recovery 96.43%, 85% of potassium dihydrogen phosphate.
Process 8:
Centrifugation mother liquor out in process 7 is returned in reactor and heated after concentrated 3.5 hours, add phosphoric acid1800kg (85% phosphoric acid) is heated to 98 DEG C, slowly adds potassium dihydrogen phosphate 2127kg, in the process adding while stirringHeating, after 3 hours, temperature is raised to 132 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer processCooling, crystallization, separation, the oven dry of 4.5 hours, obtain acid potassium phosphate (potassium polyphposphate) product 3418kg. Its quality is:
The 8th rate of recovery 93.57% of phosphoric acid of the 8th rate of recovery 93.56%, 85% of potassium dihydrogen phosphate.
Process 9:
Centrifugation mother liquor out in process 8 is returned in reactor and heated after concentrated 3.5 hours, add phosphoric acid1500kg (85% phosphoric acid) is heated to 98 DEG C, slowly adds potassium dihydrogen phosphate 1773kg, in the process adding while stirringHeating, after 3 hours, temperature is raised to 142 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer processCooling, crystallization, separation, the oven dry of 4.5 hours, obtain acid potassium phosphate (potassium polyphposphate) product 3237kg. Its quality is:
In the 9th rate of recovery 106.31%(process 8 of phosphoric acid of the 9th rate of recovery 106.68%, 85% of potassium dihydrogen phosphate fromThe heart is isolated the potassium dihydrogen phosphate in mother liquor, 85% phosphoric acid part enters product).
Process 10:
Centrifugation mother liquor out in process 9 is returned in reactor and heated after concentrated 3.5 hours, add phosphoric acid1500kg (85% phosphoric acid) is heated to 92 DEG C, slowly adds potassium dihydrogen phosphate 1773kg, in the process adding while stirringHeating, after 3 hours, temperature is raised to 135 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer processCooling, crystallization, separation, the oven dry of 4.5 hours, obtain acid potassium phosphate (potassium polyphposphate) product 3107kg. Its quality is:
In the tenth rate of recovery 102.04%(process 8 of phosphoric acid of the tenth rate of recovery 102.12%, 85% of potassium dihydrogen phosphate fromThe heart is isolated the potassium dihydrogen phosphate in mother liquor, 85% phosphoric acid part enters product).
Embodiment 11:
Centrifugation mother liquor out in embodiment 11 is returned in reactor and heated after concentrated 3 hours, add phosphoric acid1500kg (85% phosphoric acid) is heated to 91 DEG C, slowly adds potassium dihydrogen phosphate 1773kg, in the process adding while stirringHeating, after 3 hours, temperature is raised to 135 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer processCooling, crystallization, separation, the oven dry of 4.5 hours, obtain acid potassium phosphate (potassium polyphposphate) product 3007kg, and its quality is:
The tenth rate of recovery 98.75% of phosphoric acid of the tenth rate of recovery 98.77%, 85% of potassium dihydrogen phosphate.
Process 12:
Centrifugation mother liquor out in embodiment 11 is returned in reactor and heated after concentrated 3 hours, add phosphoric acid1500kg (85% phosphoric acid) is heated to 87 DEG C, slowly adds potassium dihydrogen phosphate 1773kg, in the process adding while stirringHeating, after 3 hours, temperature is raised to 137 DEG C, has been the viscous liquid of clarification in reactor, puts into crystallizer processCooling, crystallization, separation, the oven dry of 4.5 hours, obtain acid potassium phosphate (potassium polyphposphate) product 2986kg. Its quality is:
The tenth rate of recovery 98.07% of phosphoric acid of the tenth rate of recovery 98.08%, 85% of potassium dihydrogen phosphate.
Above-mentioned each process also can be regarded independent embodiment as.
Embodiment bis-:
Adopt potassium hydroxide and phosphoric acid to prepare the method for acid potassium phosphate, see Fig. 2, its method is as follows:
Method 1:
In reactor, first add water 500kg, after add 48% potassium hydroxide 1018kg,, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 200 DEG C～230 DEG C, and exhaust temperature is controlled at 110 DEG C～115 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 1586kg in spray dryer. Its quality is:
The 1st rate of recovery 78.15%, this product becomes white powder, after one week of stacking, has caking phenomenon, and (spraying is dryDevice inwall has scale formation).
Method 2:
In reactor, first add water 500kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 200 DEG C～230 DEG C, and exhaust temperature is controlled at 120 DEG C～125 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 1886kg in spray dryer. Its quality is:
The 2nd rate of recovery 92.95%. This product becomes white powder, after one week of stacking, still has caking phenomenon, and (spraying is dryDry device inwall has scale formation).
Method 3:
In reactor, first add water 400kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 200 DEG C～230 DEG C. Exhaust temperature is controlled at 125 DEG C～130 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 1917kg in spray dryer. Its quality is:
The 3rd rate of recovery 94.34%. This product becomes white powder, and bulk density ratio method 1, method 2 are little, stacks a starAfter date also has caking phenomenon, (spray dryer inwall has scale formation).
Method 4:
In reactor, first add water 400kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at (200 DEG C～230 DEG C. ), exhaust temperature is controlled at (130 DEG C～135DEG C). neutralizer evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 1957kg, its quality in spray dryerFor:
The 4th rate of recovery 96.31%. This product becomes white powder, and bulk density ratio method 3 is also little, stacks a weekAfter there is no caking phenomenon,
Method 5:
In reactor, first add water 300kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at (230 DEG C～260 DEG C. ), exhaust temperature is controlled at (130 DEG C～135DEG C). neutralizer evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 1976kg, its quality in spray dryerFor:
The 5th rate of recovery 97.24%. This product becomes white powder, and bulk density and method 4 are similar, stacks a weekAfter there is no caking phenomenon
Method 6:
In reactor, first add water 300kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 260 DEG C～290 DEG C, and exhaust temperature is controlled at 130 DEG C～135 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 2045kg in spray dryer, and its quality is:
The 6th rate of recovery 100.64%, this product does not have caking phenomenon after becoming white powder to stack January.
Method 7:
In reactor, first add water 300kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 290 DEG C～320 DEG C, and exhaust temperature is controlled at 130 DEG C～135 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 1987kg in spray dryer, and its quality is:
The 7th rate of recovery 97.79%, this product does not have caking phenomenon after becoming white powder to stack January.
Method 8:
In reactor, first add water 300kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 320 DEG C～350 DEG C, and exhaust temperature is controlled at 130 DEG C～135 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 2018kg in spray dryer, and its quality is:
The 8th rate of recovery 99.31%. This product does not have caking phenomenon after becoming white powder to stack January.
Method 9:
In reactor, first add water 300kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 350 DEG C～380 DEG C, and exhaust temperature is controlled at 130 DEG C～135 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 2065kg in spray dryer, and its quality is:
The 9th rate of recovery 101.62%. This product becomes the increase of white powder particle, hollow, and bulk density is much smaller, 25kgPackaging bag can only fill 15kg, stack after January and there is no caking phenomenon, in spray dryer, ancient piece of jade, round, flat and with a hole in its centre fouling has and comes off.
Method 10:
In reactor, first add water 300kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 380 DEG C～420 DEG C, and exhaust temperature is controlled at 130 DEG C～135 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 2085kg in spray dryer, and its quality is:
The 10th rate of recovery 102.61%. . This product becomes the increase of white powder particle, hollow, and bulk density is much smaller,The packaging bag of 25kg can only fill 15kg, and stacking does not have caking phenomenon after January. (spray dryer in ancient piece of jade, round, flat and with a hole in its centre fouling have come off)
Method 11:
In reactor, first add water 300kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at 250 DEG C～280 DEG C, and exhaust temperature is controlled at 135 DEG C～140 DEG C. NeutralizationLiquid evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 1982kg in spray dryer, and its quality is:
The 11st rate of recovery 97.54%. This product does not have caking phenomenon after becoming white powder to stack January.
Method 12:
In reactor, first add water 300kg, after add 48% potassium hydroxide 1018kg, then add 85% phosphoric acid2000kg, and control and add speed, makes temperature remain on 85 DEG C of left and right, after abundant reaction, neutralizer is sent into a high position with pumpGroove, the hot blast inlet temperature of spray dryer is controlled at (280 DEG C-310 DEG C. ), exhaust temperature is controlled at (135 DEG C-140DEG C). neutralizer evaporates and loses water and obtain acid potassium phosphate (potassium polyphposphate) product 2017kg in spray dryer. Its qualityFor:
The tenth secondary returning yield 99.26%. This product does not have caking phenomenon after becoming white powder to stack January.
Above-mentioned each method also can be regarded independent embodiment as.
Be more than exemplary illustration, do not represent protection scope of the present invention.
Claims (3)
1. a production method for acid potassium phosphate, is specially and adopts phosphoric acid and potassium dihydrogen phosphate to prepare acid potassium phosphate; By asLower step is carried out:
A, phosphoric acid is heated in reactor to 65 DEG C～95 DEG C;
B, potassium dihydrogen phosphate is slowly added in reactor, and continue to be heated to 80 DEG C in the process adding～150 DEG C;
The above-mentioned phosphoric acid adding and potassium dihydrogen phosphate are 1:1 in molar ratio;
C, continuous heating to potassium dihydrogen phosphate dissolve completely; Obtain lysate;
Lysate is inserted in crystallizer, carry out cooling and crystallization, then through separating, dry to obtain acid potassium phosphate.
2. the production method of acid potassium phosphate as claimed in claim 1, is characterized in that, described lysate is through Crystallization SeparationThe mother liquor of rear generation reclaims after concentrated, and adds reactor utilization.
3. a production method for acid potassium phosphate, is specially and adopts phosphoric acid and potassium hydroxide to prepare acid potassium phosphate; By as followsStep is carried out:
A, phosphoric acid is heated in reactor to 65 DEG C～95 DEG C;
B, potassium hydroxide is slowly added in reactor, and continue to be heated to 80 DEG C in the process adding～150 DEG C;
The above-mentioned potassium hydroxide adding and phosphoric acid are 1:2 in molar ratio;
C, continuous heating, to abundant reaction, obtain neutralizer;
D, the spray-dried acid potassium phosphate that makes of neutralizer.
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