CN101357755B - Production process of potassium dihydrogen phosphate - Google Patents

Production process of potassium dihydrogen phosphate Download PDF

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CN101357755B
CN101357755B CN2008100461074A CN200810046107A CN101357755B CN 101357755 B CN101357755 B CN 101357755B CN 2008100461074 A CN2008100461074 A CN 2008100461074A CN 200810046107 A CN200810046107 A CN 200810046107A CN 101357755 B CN101357755 B CN 101357755B
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mother liquor
potassium
dihydrogen phosphate
primary phosphate
hydroxide solution
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CN101357755A (en
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何锡容
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Abstract

The invention discloses a production method for potassium dihydrogen phosphate, which essentially comprises: A. yellow phosphorus and oxygen combust in a combustion chamber; B. potassium hydroxide solution and/or the mother liquor for producing potassium dihydrogen phosphate absorb phosphorous pentoxide in a hydration tower under negative pressure, generating a mixture of phosphoric acid and potassium dihydrogen phosphate after concentration; C. the mixture is sent to a reaction crystallizer, potassium hydroxide solution is added to the reaction crystallizer to adjust the pH value; the mixture is cooled and crystallized to separate potassium dihydrogen phosphate; the separated mother liquor is returned to the step B to be as the absorbent of the phosphorus pentoxide. The method has the essential advantages of solving the problem of consuming a large amount of energy in the process of concentrating potassium hydroxide solution and producing potassium dihydrogen phosphate mother liquor of the existing production method for potassium dihydrogen phosphate, greatly reducing production cost, saving resources and improving production environment.

Description

A kind of production method of potassium primary phosphate
Technical field:
The present invention relates to a kind of production method of potassium primary phosphate, particularly the mother liquor with potassium hydroxide solution and/or production potassium primary phosphate absorbs the method that five oxygen, two phosphorus are produced potassium primary phosphate.
Background technology:
At present, the production method of potassium primary phosphate is to adopt the traditional potassium hydroxide and the neutralisation of thermal phosphoric acid, though this method technology is simple, with short production cycle, quality product is high, investment is little; But because employed potassium raw material is 48%, 50% potassium hydroxide that unconcentrated 30% potassium hydroxide of ashery or ashery secondary processing concentrated, need evaporate a large amount of water aborning, the energy consumption height, pollution is heavy, the cost height.And other certain methods as: although cost of material such as extraction process, double decomposition, integrated process are lower, complex process, flow process is long, the energy consumption height, pollution is heavy, and raw material availability is low, equipment corrosion can't solve, and must consider the production of by product, is difficult to receive the ideal effect.
Up to now, do not see the mother liquor that adopts potassium hydroxide solution and/or produce potassium primary phosphate as yet and absorb the report that Vanadium Pentoxide in FLAKES is produced the potassium primary phosphate document.
Summary of the invention:
The objective of the invention is in order to overcome the deficiency of existing production technology, provide a kind of mother liquor to absorb the method that Vanadium Pentoxide in FLAKES is produced potassium primary phosphate with potassium hydroxide solution and/or production potassium primary phosphate, utilize yellow phosphorus burning, Vanadium Pentoxide in FLAKES and potassium hydroxide are participated in the heat of vaporization potassium hydroxide solution of chemical reaction release or the water in the production potassium primary phosphate mother liquor, and utilize potassium hydroxide solution or produce water and Vanadium Pentoxide in FLAKES and potassium hydroxide reaction production potassium primary phosphate in the potassium primary phosphate mother liquor, solved and needed a large amount of water of evaporation in the existing potassium primary phosphate production process, the problem that energy consumption is high, reduced production cost, save resource, reduced pollution.
The object of the present invention is achieved like this:
Production principle of the present invention is as follows: yellow phosphorus and oxygen burning generate Vanadium Pentoxide in FLAKES, and water, Vanadium Pentoxide in FLAKES, potassium hydroxide reaction generate phosphoric acid and potassium primary phosphate, and discharge a large amount of heat.
Figure G2008100461074D00011
Figure G2008100461074D00012
The production method of a kind of potassium primary phosphate of the present invention, it comprises: yellow phosphorus generates Vanadium Pentoxide in FLAKES with airborne oxygen burning in the combustion chamber, the mother liquor reaction of potassium hydroxide solution that Vanadium Pentoxide in FLAKES is sent here with recycle pump in the hydration tower and/or production potassium primary phosphate generates the mixture of phosphoric acid and potassium primary phosphate, utilize yellow phosphorus burning, Vanadium Pentoxide in FLAKES and potassium hydroxide to participate in reaction institute liberated heat simultaneously, concentrate the mother liquor of potassium hydroxide solution or production potassium primary phosphate in the hydration tower under negative pressure; Phosphoric acid and potassium primary phosphate mixture filtrate after filtering after concentrating are sent into reaction crystalizer, and the hydro-oxidation potassium solution is adjusted pH value, and cooling then, crystallization, separation obtain potassium dihydrogen phosphate product, and mother liquor returns circulation groove and sends in the hydration tower through recycle pump.Therefore, technical characterictic of the present invention comprises:
A. yellow phosphorus and oxygen are burning Indoor Combustion;
B. the mother liquor with potassium hydroxide solution and/or production potassium primary phosphate absorbs five oxidations under the negative pressure in the hydration tower
Two phosphorus, the mixture of generation phosphoric acid and potassium primary phosphate;
C. said mixture is sent into reaction crystalizer, the hydro-oxidation potassium solution is adjusted pH value in reaction crystalizer, cooling, crystallization, isolate potassium primary phosphate, and dry, analyze, pack potassium dihydrogen phosphate product, mother liquor returns the absorption agent that B makes Vanadium Pentoxide in FLAKES.
Above-mentioned hydration tower is made of stainless steel, the quantity combusted of control yellow phosphorus, and the consumption of adjustment water coolant make the temperature in the hydration tower remain on 80 ℃～95 ℃, moisture content with in the mother liquor of guaranteeing potassium hydroxide solution and/or production potassium primary phosphate obtains evaporation in the hydration tower under negative pressure;
Vacuum tightness is by adjusting the rate of air sucked in required control of vacuum pump in the above-mentioned hydration tower, and vacuum tightness is 66.64 * 10 3～86.64 * 10 3Pa;
The above-mentioned phosphoric acid and the mixture density of potassium primary phosphate are controlled at 1.60 * 10 3～1.70 * 10 3Kg/m 3
The mixture reaction temperature of potassium hydroxide solution and phosphoric acid and potassium primary phosphate is controlled at 80 ℃～95 ℃ in the above-mentioned reaction crystalizer, pH value 4.3～4.7, density 1.45 * 10 3～1.50 * 10 3Kg/m 3
The invention has the advantages that the mother liquor replacement water that utilizes potassium hydroxide solution and/or produce potassium primary phosphate absorbs the Vanadium Pentoxide in FLAKES direct production potassium primary phosphate that yellow phosphorus burning generated, utilize the water in yellow phosphorus burning, Vanadium Pentoxide in FLAKES and potassium hydroxide participation reaction institute's liberated heat evaporation potassium hydroxide solution or the production potassium primary phosphate mother liquor simultaneously; Solved the existing production method of potassium primary phosphate, concentrate potassium hydroxide solution in process of production and need consume a large amount of energy with production potassium primary phosphate mother liquor, reduced production cost significantly, product cost per ton can descend 600 yuan, also save resource, improved production environment.
Description of drawings:
Fig. 1 is a process flow sheet of the present invention.
Specific embodiment:
The invention will be further described below in conjunction with accompanying drawing and by specific embodiment.
Embodiment 1:
Add potassium hydroxide solution 1500kg (KOH:30%) in circulation groove, send into recycle pump that spraying absorbs the Vanadium Pentoxide in FLAKES gas that yellow phosphorus burning generates in the hydration tower, the flow control of yellow phosphorus is at 150kg per hour, and vacuum degree control is 66.64 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 85 ℃ in the hydration tower, absorbs through 3 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.62 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 1220kg (KOH:30%) again, and control adding speed, make temperature remain on 80 ℃, record density 1.45 * 10 3Kg/m 3, pH value 4.5, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1557.3kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.68％ 52.04％ 0.08％ 0.18％ 34.45％ 4.53 0.02％
K 2O yield for the first time is 78.34%, P 2O 5Yield is 78.63% for the first time.
Embodiment 2:
The mother liquor that centrifugation among the embodiment one is come out returns circulation groove, sends in the hydration tower spraying with recycle pump and absorbs the Vanadium Pentoxide in FLAKES gas that yellow phosphorus burning generates, and the flow control of yellow phosphorus is at 120kg per hour, and vacuum degree control is 66.64 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 95 ℃ in the hydration tower, absorbs through 2.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.68 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 1420kg (KOH:30%) again, and control adding speed, make temperature remain on 85 ℃, record density 1.48 * 10 3Kg/m 3, pH value 4.6, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and its output is 1179.6kg, and quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.56％ 51.98％ 0.1％ 0.22％ 34.51％ 4.56 0.019％
K 2O for the second time yield is that 113.86% (embodiment one isolates the K in the mother liquor 2O partly enters product), P 2O 5For the second time yield is that 111.55% (embodiment one isolates the P in the mother liquor 2O 5Part enters product).
Embodiment 3:
The mother liquor that comes out of centrifugation among the embodiment 2 is returned circulation groove, add potassium hydroxide solution 900kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 150kg per hour, and vacuum degree control is 84.0 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 2.5 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.66 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 1330kg (KOH:30%) again, and control adding speed, make temperature remain on 80 ℃, record density 1.48 * 10 3Kg/m 3, pH value 4.6, through crystallisation by cooling, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1625kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.48％ 51.93％ 0.12％ 0.15％ 34.38％ 4.49 0.012％
K 2O yield for the third time is 99.50%, P 2O 5Yield is 98.26% for the third time.
Embodiment 4:
The mother liquor that comes out of centrifugation among the embodiment 3 is returned circulation groove, add potassium hydroxide solution 900kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 130kg per hour, and vacuum degree control is 84.0 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 2.5 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.65 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 1000kg (KOH:30%) again, and control adding speed, make temperature remain on 85 ℃, record density 1.47 * 10 3Kg/m 3, pH value 4.4, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1405kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.67％ 52.03％ 0.09％ 0.18％ 34.42％ 4.49 0.17％
K 2O the 4th yield is that 101.09% (embodiment three isolates the K in the mother liquor 2O partly enters product),
P 2O 5The 4th yield is 98.21%.
Embodiment 5:
The mother liquor that comes out of centrifugation among the embodiment 4 is returned circulation groove, add potassium hydroxide solution 700kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 150kg per hour, and vacuum degree control is 80.0 * 10 in the hydration tower 3Kpa, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 2.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.63 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 700kg (KOH:48%) again, and control adding speed, make temperature remain on 90 ℃, record density 1.46 * 10 3Kg/m 3, pH value 4.5, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1279.5kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.58％ 51.99％ 0.10％ 0.25％ 34.45％ 4.45 0.07％
K 2O the 5th yield is 96.19%, P 2O 5The 5th time yield is 96.81%.
Embodiment 6:
The mother liquor that comes out of centrifugation among the embodiment 5 is returned circulation groove, add potassium hydroxide solution 700kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 130kg per hour, and vacuum degree control is 80.0 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 3.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.68 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 1600kg (KOH:30%) again, and control adding speed, make temperature remain on 95 ℃, record density 1.47 * 10 3Kg/m 3, pH value 4.5, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1665.4kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.74％ 52.07％ 0.12％ 0.08％ 34.47％ 4.53 0.09％
K 2The 6th yield of O is 99.13%, P 2O 5The 6th time yield is 97.08%.
Embodiment 7:
The mother liquor that comes out of centrifugation among the embodiment 6 is returned circulation groove, add potassium hydroxide solution 800kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 130kg per hour, and vacuum degree control is 80.0 * 10 in the hydration tower 3Kpa, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 3.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.68 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is being sent into reaction crystalizer, add potassium hydroxide solution 1540kg (KOH:30%) again, and control adding speed, make temperature remain on 90 ℃, record density 1.48 * 10 3Kg/m 3, pH value 4.6, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1659.8kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.62％ 52.01％ 0.13％ 0.15％ 34.46％ 4.63 0.07％
K 2The 7th yield of O is 98.77%, P 2O 5The 7th time yield is 96.32%.
Embodiment 8:
The mother liquor that comes out of centrifugation among the embodiment 7 is returned circulation groove, add potassium hydroxide solution 1000kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 140kg per hour, and vacuum degree control is 73.3 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 3.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.66 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide alkaline solution 1175kg (KOH:50%) again, and control adding speed, make temperature remain on 90 ℃, record density 1.46 * 10 3Kg/m 3, pH value 4.4, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 2017.3kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.38％ 51.88％ 0.08％ 0.29％ 34.31％ 4.41 0.05％
K 2The 8th yield of O is 94.16%, P 2O 5The 8th time yield is 94.24%.
Embodiment 9:
The mother liquor that comes out of centrifugation among the embodiment 8 is returned circulation groove, add potassium hydroxide solution 600kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 120kg per hour, and vacuum degree control is 80.0 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 95 ℃ in the hydration tower, absorbs through 3.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.68 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 920kg (KOH:50%) again, and control adding speed, make temperature remain on 80 ℃, record density 1.50 * 10 3Kg/m 3, pH value 4.5, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1630.6kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.53％ 51.96％ 0.18％ 0.15％ 34.42％ 4.48 0.12％
K 2The 9th yield of O is that 104.50% (embodiment eight isolates the K in the mother liquor 2O partly enters product),
P 2O 5The 9th yield is that 102.76% (embodiment eight isolates the P in the mother liquor 2O 5Part enters product).
Embodiment 10:
The mother liquor that comes out of centrifugation among the embodiment 9 is returned circulation groove, add potassium hydroxide solution 1000kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 130kg per hour, and vacuum degree control is 77.3 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 3.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.66 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 820kg (KOH:48%) again, and control adding speed, make temperature remain on 90 ℃, record density 1.48 * 10 3Kg/m 3, pH value 4.6, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1668.7kg, and its quality is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.71％ 52.05％ 0.07％ 0.09％ 34.47％ 4.63 0.09％
K 2The 10th yield of O is 98.81%, P 2O 5The tenth time yield is 97.24%.
Embodiment 11:
The mother liquor that comes out of centrifugation among the embodiment 10 is returned circulation groove, add potassium hydroxide potassium solution 1000kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 130kg per hour, and vacuum degree control is 77.3 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 3.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.66 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 1300kg (KOH:30%) again, and control adding speed, make temperature remain on 95 ℃, record density 1.48 * 10 3Kg/m 3, pH value 4.5, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is that its quality of 1657.4kg is:
Project KH 2PO 4 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.48％ 51.93％ 0.08％ 0.13％ 34.41％ 4.53 0.11％
K 2The 11st yield of O is 98.48%, P 2O 5The 11 time yield is 96.36%.
Embodiment 12:
The mother liquor that comes out of centrifugation among the embodiment 11 is returned circulation groove, add potassium hydroxide solution 1000kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 130kg per hour, and vacuum degree control is 73.3 * 10 in the hydration tower 3, the flow of adjustment water coolant, temperature is controlled at 90 ℃ in the hydration tower, absorbs through 3.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.65 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 1340kg (KOH:30%) again, and control adding speed, make temperature remain on 85 ℃, record density 1.46 * 10 3Kg/m 3, pH value 4.6, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1642.6kg, and its quality is:
Project KH 2PO 4 P05 CL - H20 K20 PH Water-insoluble
Content 99.28％ 51.83％ 0.11％ 0.45％ 34.32％ 4.58 0.13％
K 2The 12nd yield of O is 95.68%, P 2O 5The tenth secondary yield is 96.00%.
Embodiment 13:
The mother liquor that comes out of centrifugation among the embodiment 12 is returned circulation groove, add potassium hydroxide solution 1000kg (KOH:30%) again, send into the Vanadium Pentoxide in FLAKES gas that spraying absorption yellow phosphorus burning generates in the hydration tower with recycle pump, the flow control of yellow phosphorus is at 130kg per hour, and vacuum degree control is 86.64 * 10 in the hydration tower 3Pa, the flow of adjustment water coolant, temperature is controlled at 95 ℃ in the hydration tower, absorbs through 3.0 hours circulations, and the density of phosphoric acid and potassium primary phosphate mixture reaches 1.68 * 10 in the circulation groove 3Kg/m 3, with recycle pump this mixture is sent into reaction crystalizer again, add potassium hydroxide solution 1300kg (KOH:30%) again, and control adding speed, make temperature remain on 90 ℃, record density 1.48 * 10 3Kg/m 3, pH value 4.5, through cooling, crystallization, centrifugation, mother liquor returns circulation groove, makes the absorption agent of Vanadium Pentoxide in FLAKES.Centrifugal work in-process drying obtains potassium dihydrogen phosphate product, and output is 1672.3kg, and its quality is:
Project KH2P04 P 2O 5 CL - H 2O K 2O PH Water-insoluble
Content 99.68％ 52.04％ 0.09％ 0.16％ 34.43％ 4.53 0.10％
K 2The 13 yield of O is 99.42%, P 2O 5The 13 time yield is 97.42%.

Claims (1)

1. the production method of a potassium primary phosphate is characterized in that this method comprises:
A. yellow phosphorus and oxygen are in the combustion chamber internal combustion;
B. the mother liquor with potassium hydroxide solution and/or production potassium primary phosphate remains on 80 ℃～95 ℃ in temperature, and vacuum degree control is 66.64 * 10 3～86.64 * 10 3In the hydration tower of Pa, absorb Vanadium Pentoxide in FLAKES under the negative pressure, concentrate and generate the mixture of phosphoric acid and potassium primary phosphate, phosphoric acid and potassium primary phosphate mixture density are controlled at 1.60 * 10 3～1.7 * 10 3Kg/m 3
C. said mixture is sent into reaction crystalizer, hydro-oxidation potassium solution adjustment pH value is 4.3～4.7 in reaction crystalizer, density 1.45 * 10 3～1.5 * 10 3Kg/m 3, cooling, crystallization, isolate potassium primary phosphate, the mother liquor after separating returns the absorption agent that B makes Vanadium Pentoxide in FLAKES.
CN2008100461074A 2008-09-19 2008-09-19 Production process of potassium dihydrogen phosphate Expired - Fee Related CN101357755B (en)

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CN101987727B (en) * 2009-08-05 2013-10-23 天津市化学试剂研究所 Preparation method of pH standard reagent disodium hydrogen phosphate
CN102167298B (en) * 2010-12-29 2012-08-29 武汉同源药业有限公司 Preparation method of high-purity dipotassium phosphate crude drug
CN103172040A (en) * 2011-12-23 2013-06-26 山东鼎欣生物科技有限公司 Production method of high-purity potassium dihydrogen phosphate
CN104843660B (en) * 2015-06-05 2017-08-04 连云港市德邦精细化工有限公司 A kind of preparation method of sodium dihydrogen phosphate
CN112607717A (en) * 2020-12-18 2021-04-06 胡渝涛 Preparation method and application of potassium acid phosphate

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