CN104003362A - Production method of dipotassium phosphate - Google Patents
Production method of dipotassium phosphate Download PDFInfo
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- CN104003362A CN104003362A CN201410213888.7A CN201410213888A CN104003362A CN 104003362 A CN104003362 A CN 104003362A CN 201410213888 A CN201410213888 A CN 201410213888A CN 104003362 A CN104003362 A CN 104003362A
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- hydrogen phosphate
- dipotassium hydrogen
- ureaphil
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Abstract
The invention relates to the technical field of chemical engineering and particularly relates to a production method of dipotassium phosphate. The method comprises the following step: carrying out a reaction on urea phosphate and potassium hydroxide in a stirring manner for 20 to 70 minutes by controlling a reaction temperature within 50 DEG C to 90 DEG C and controlling a pH (Potential Of Hydrogen) value at a final point of the reaction within 8 to 9.5 so as to prepare the dipotassium phosphate product. The produced dipotassium phosphate product completely conforms to the standard of food-grade dipotassium phosphate by controlling the whole process conditions, i.e., the content of the dipotassium phosphate is between 98.15% and 98.31%, the pH (10g/L of solution) is between 8.9 and 9.2, the content of water insoluble matters is between 0.11% and 0.17%, the content of fluorides is between 8.04mg/kg and 9.13mg/kg, the content of arsenic is between 2.03mg/kg and 2.71mg/kg, the content of heavy metal is between 8.9mg/kg and 9.4mg/kg as well as the loss on drying is between 1.64% and 1.82% according to physical and chemical indexes in a manner of sampling analysis.
Description
Technical field
The present invention relates to chemical technology field, especially a kind of production method of dipotassium hydrogen phosphate.
Background technology
Dipotassium hydrogen phosphate can be used as in foodstuffs industry the gentle alkaline agent, yeast food of agent for fermentation, seasonings, raising agent, milk-product etc.; Also can be used as bacteria culture medium, manufacture raw material, the liquid fertilizer of potassium pyrophosphate, the inhibiter of ethylene glycol antifreeze, make feed nutrition supplement etc.; In national product, be widely used.At present, dipotassium hydrogen phosphate is mainly to adopt thermal phosphoric acid or Wet Phosphoric Acid Market to make raw materials for production, thermal phosphoric acid is because energy consumption is high in process of production, pollute greatly, along with energy shortage, environmental pollution is more and more serious, thermal phosphoric acid is prepared dipotassium hydrogen phosphate and will be progressively eliminated, the purification of phosphoric acid by wet process is because operational path is long, and plant construction investment is large, causes adopting purifying phosphoric acid to prepare dipotassium hydrogen phosphate cost compare high; Production method for dipotassium hydrogen phosphate mainly contains neutralisation, salt of wormwood method.
Neutralisation is that solid potassium hydroxide is made into 30% aqueous solution, to after clear soln metering, add in corrosion-resistant retort, under agitation slowly add appropriate phosphoric acid solution (phosphorus acid content is 50%), at 90～100 ℃, carry out neutralization reaction, indicator (is made just till aobvious redness with phenolphthalein in control of reaction end point pH8.5～9.0; Be heated to 120～124 ℃ and concentrate, after strength of solution reaches claimed range, remove by filter insolubles; Clear filtrate is through being cooled to crystallization below 20 ℃, then through centrifugation, dry, makes dipotassium hydrogen phosphate finished product; Mother liquor after filtering Returning process is used; Its reaction principle equation is: H
3pO
4+ 2KOH → K
2hPO
4+ 2H
2o.
Salt of wormwood method: under constantly stirring, solution of potassium carbonate is added in 30% phosphoric acid solution and reacts, in and during terminal pH value be 8.5～9.0 (phenolphthalein indicator is aobvious redness just); Neutralizer removes by filter insolubles after being concentrated into 120～124 ℃, is then cooled to 20 ℃ of following crystallizations; Centrifugation, the dry product that to obtain, during mother liquor is delivered to and operation recycle; Its reaction principle equation is: K
2cO
3+ H
3pO
4→ K
2hPO
4+ H
2o+CO
2↑.
Visible, in preparation process for dipotassium hydrogen phosphate in prior art, adopt phosphoric acid to react and produce product with potassium hydroxide or salt of wormwood, in this process due to the corrosion of phosphoric acid to equipment, therefore the material for equipment requires comparatively strict, meanwhile, in production process, can need a large amount of water, and adopt high temperature concentrated product, need to expend larger energy, make in the production process of whole dipotassium hydrogen phosphate product cost higher, seriously polluted, do not there is preferably economic benefits and the value of environmental protection.
Summary of the invention
In order to solve the above-mentioned technical problem existing in prior art, the invention provides a kind of Ureaphil that uses higher degree and potassium hydroxide or salt of wormwood as raw material production dipotassium hydrogen phosphate product, can reduce the consumption of water, do not need with high temperature concentrated product slip simultaneously, reduced energy consumption, by product in whole production process (urea soln) the raw materials for production Ureaphil that is recycled, the ER for emission rate that has reduced waste gas, waste residue, waste water is the dipotassium hydrogen phosphate production method with significant economic benefits and the value of environmental protection.
Specifically be achieved by the following technical programs:
A production method for dipotassium hydrogen phosphate, adopts Ureaphil to react with potassium hydroxide, and to control temperature of reaction be 50 ℃-90 ℃, stirring reaction 20-70min, and control endpoint pH is 8-9.5, makes dipotassium hydrogen phosphate product.
Specifically comprise the following steps:
(1) preparation of Ureaphil solution: Ureaphil is placed in to dissolving tank, adds a certain amount of water, stir by the speed of 30r/min, obtain Ureaphil solution, and be warming up to 45 ℃;
(2) add potassium hydroxide synthetic: with transferpump, Ureaphil solution to be delivered in reactive tank, and be 1:(1.95-2.05 according to the mol ratio of Ureaphil and potassium hydroxide) ratio be metered into potassium hydroxide and its hybrid reaction, and control temperature of reaction and maintain 50 ℃-90 ℃, according to the stirring velocity stirring reaction 20-70min of 30r/min, when control terminal pH value is 8-9.5, obtain dipotassium hydrogen phosphate slip;
(3) crystallisation by cooling centrifugation: dipotassium hydrogen phosphate slip is transported in crystallizer and is cooled to below 40 ℃ with transferpump, crystallisation by cooling, after crystallize out, dipotassium hydrogen phosphate slurry pipeline transport to whizzer is carried out to centrifugation, obtain filtrate and filter cake, filtrate is urea soln, is sent to production of urea phosphate line; Filter cake is dipotassium hydrogen phosphate product, and it is dry with 90 ℃ in drying machine, obtains dipotassium hydrogen phosphate product.
Described Ureaphil reacts with potassium hydroxide, for Ureaphil solid reacts with potassium hydroxide solution.
Described Ureaphil reacts with potassium hydroxide, for Ureaphil solution reacts with potassium hydroxide solution.
Described Ureaphil reacts with potassium hydroxide, is Ureaphil solution and potassium hydroxide solid reaction.
Described temperature of reaction is 60-80 ℃.
Described temperature of reaction is 70 ℃.
The described stirring reaction time is 30-60min.
The described stirring reaction time is 40-50min.
The described stirring reaction time is 45min.
Described Ureaphil and the mol ratio of potassium hydroxide are 1:(1.95-2).
Described Ureaphil and the mol ratio of potassium hydroxide are 1:(2-2.05).
Described Ureaphil and the mol ratio of potassium hydroxide are 1:(2-2.03).
Described Ureaphil and the mol ratio of potassium hydroxide are 1:(1.98-2).
Described Ureaphil and the mol ratio of potassium hydroxide are 1:2.
Described endpoint pH is 8.5-9.
Described endpoint pH is 8.8.
Described dipotassium hydrogen phosphate product, its physical and chemical index is that dipotassium hydrogen phosphate content is that 98.15-98.31%, pH (10g/L solution) are that 8.9-9.2, water-insoluble are that 0.11-0.17%, fluorochemical are that 8.04-9.13mg/kg, arsenic content are that 2.03-2.71mg/kg, heavy metal content are 8.9-9.4mg/kg, and loss on drying is 1.64-1.82%.
Described dipotassium hydrogen phosphate product, its physical and chemical index is that dipotassium hydrogen phosphate content is 98.23%, pH (10g/L solution) is 9, water-insoluble is 0.14%, fluorochemical is that 8.09mg/kg, arsenic content are that 2.37mg/kg, heavy metal content are 9.2mg/kg, and loss on drying is 1.73%.
Described dipotassium hydrogen phosphate product, its physical and chemical index is that dipotassium hydrogen phosphate content is 98.25%, pH (10g/L solution) is 8.9, water-insoluble is 0.12%, fluorochemical is that 9.02mg/kg, arsenic content are that 2.03mg/kg, heavy metal content are 8.9mg/kg, and loss on drying is 1.78%.
Described dipotassium hydrogen phosphate product, its physical and chemical index is that dipotassium hydrogen phosphate content is 98.15%, pH (10g/L solution) is 8.8, water-insoluble is 0.11%, fluorochemical is that 8.04mg/kg, arsenic content are that 2.41mg/kg, heavy metal content are 9.1mg/kg, and loss on drying is 1.82%.
Described dipotassium hydrogen phosphate product, its physical and chemical index is that dipotassium hydrogen phosphate content is 98.31%, pH (10g/L solution) is 9.1, water-insoluble is 0.17%, fluorochemical is that 9.06mg/kg, arsenic content are that 2.71mg/kg, heavy metal content are 9.4mg/kg, and loss on drying is 1.77%.
Described dipotassium hydrogen phosphate product, its physical and chemical index is that dipotassium hydrogen phosphate content is 98.26%, pH (10g/L solution) is 9.2, water-insoluble is 0.16%, fluorochemical is that 9.13mg/kg, arsenic content are that 2.22mg/kg, heavy metal content are 9.3mg/kg, and loss on drying is 1.64%.
Compared with prior art, technique effect of the present invention is embodied in:
1. by Ureaphil, replace traditional purification of wet process phosphoric acid and thermal phosphoric acid to produce dipotassium hydrogen phosphate product, simplified the technological process of production, reduced water consumption and energy consumption in traditional neutralisation and salt of wormwood method, reduced dipotassium hydrogen phosphate products production cost.
2. by technique to by product urea soln recycle and reuse raw materials for production Ureaphil product, improved raw material comprehensive utilization ratio and reduced the ER for emission rate of the three wastes, there is preferably economic benefit and the value of environmental protection.
3. by the control of whole processing condition, make the dipotassium hydrogen phosphate product of producing meet food grade phosphoric acid hydrogen dipotassium standard completely, by sampling analysis physical and chemical index, be that dipotassium hydrogen phosphate content is that 98.15-98.31%, pH (10g/L solution) are that 8.9-9.2, water-insoluble are that 0.11-0.17%, fluorochemical are that 8.04-9.13mg/kg, arsenic content are that 2.03-2.71mg/kg, heavy metal content are 8.9-9.4mg/kg, loss on drying is 1.64-1.82%.
Accompanying drawing explanation
Fig. 1 is equipment flowsheet of the present invention.
1-dissolving tank 2-reactive tank 3-crystallizer 4-whizzer.
Embodiment
Below in conjunction with accompanying drawing and concrete embodiment, technical scheme of the present invention is done to further restriction, but claimed scope is not only confined to done description.
Noun explanation:
Ureaphil (Urea pHospHate, UP), is for No. CAS 4861-19-2, and molecular formula is CH
7n
2o
5p, can be expressed as CO (NH
2)
2h
3pO
4:
It is a kind of fine chemical product that is widely used in the fields such as livestock industry, industry, agricultural, its solid is white crystals or crystalline powder, and soluble in water and alcohol is insoluble to ethers, toluene and tetracol phenixin, it is acid that the aqueous solution is, and starts to decompose to emit carbonic acid gas and ammonia during melting.
Principle explanation:
The present invention adopts Ureaphil directly to react with potassium hydroxide and prepare dipotassium hydrogen phosphate product, and the principle equation of its reaction is:
CO(NH
2)
2·H
3PO
4+2KOH＝K
2HPO
4+CO(NH
2)
2+2H
2O
It is Ureaphil elder generation and potassium hydroxide generation neutralization reaction production potassium primary phosphate specifically, amount increase along with potassium hydroxide, potassium primary phosphate reacts with potassium hydroxide again produces dipotassium hydrogen phosphate, it is dipotassium hydrogen phosphate slip, by controlling endpoint pH, temperature of reaction and reaction times, make the steady quality of this product, the by product simultaneously producing in whole production process is urea soln, can be recovered to production of urea phosphate line cyclic production Ureaphil product, also can be sent to chemical fertilizers production line direct crystallization and generate urea product; Visible, whole process, without the discharge of the three wastes, has the significant value of environmental protection.
Meanwhile, the present invention also directly adopts salt of wormwood to react with Ureaphil and produces dipotassium hydrogen phosphate product, and the principle equation of its reaction is:
CO(NH
2)
2·H
3PO
4+K
2CO
3＝K
2HPO
4+CO(NH
2)
2+H
2O+CO
2
This method has solved the source unicity of potassium hydroxide raw material in first method, makes the abundant raw material of potassium dihydrogen phosphate product preparation process, further for the supply of potassium element provides safeguard, has reduced dipotassium hydrogen phosphate production cost.
Be illustrated in figure 1 equipment flowsheet of the present invention.Ureaphil being added in dissolving tank 1 to water is mixed with after Ureaphil solution, by transferpump, be transported in reactive tank 2 again, and according in the certain situation of the mol ratio of Ureaphil and potassium hydroxide, in reactive tank 2, add potassium hydroxide solution, make it that neutralization reaction occur, and by controlling reaction times and temperature of reaction, adjust endpoint pH, making it generate dipotassium hydrogen phosphate slip, is exactly Rhodiaphos DKP slip; By after dipotassium hydrogen phosphate slip proceeded to crystallizer 3 lowering the temperature, dipotassium hydrogen phosphate crystal is separated out, again dipotassium hydrogen phosphate slip is proceeded to and in whizzer 4, carry out centrifugation, obtain filtrate and filter cake, the solution that filtrate being contained carboxamide, sent to the synthetic production line of Ureaphil, carried out recycle; Filter cake is dipotassium hydrogen phosphate product, sends in drying machine and adopts certain drying temperature to carry out drying treatment, obtains dipotassium hydrogen phosphate product, meets the standard of food grade phosphoric acid hydrogen dipotassium product completely.
Embodiment 1
A production method for dipotassium hydrogen phosphate, specifically comprises the following steps:
(1) preparation of Ureaphil solution: Ureaphil solid is placed in to dissolving tank, a certain amount of water is added to dissolving tank, adopt the speed of 30r/min at the uniform velocity to stir, obtain Ureaphil solution, and be heated to 45 ℃;
(2) add potassium hydroxide synthetic: with transferpump, the Ureaphil solution after heating to be delivered in reactive tank, and the ratio that is 1:1.95 according to the mol ratio of Ureaphil and potassium hydroxide adds the potassium hydroxide solid after metering in reactive tank, adopt the stirring velocity of 50r/min to stir simultaneously, and temperature of reaction is controlled to 50 ℃, reaction 20min, the pH value of controlling terminal is 8.2, obtains dipotassium hydrogen phosphate slip;
(3) crystallisation by cooling centrifugation: dipotassium hydrogen phosphate slurry pipeline transport is cooled at 40 ℃ in crystallizer with transferpump, crystallisation by cooling, after crystallize out, dipotassium hydrogen phosphate slurry pipeline transport to whizzer is carried out to centrifugation, obtain filtrate and filter cake, filtrate is urea soln, is sent to the synthetic production line of Ureaphil; Filter cake is dipotassium hydrogen phosphate product, and it is dry with 90 ℃ in drying machine, obtains dipotassium hydrogen phosphate product.
Sampling analysis, its physical and chemical index is that dipotassium hydrogen phosphate content is 98.25%, pH (10g/L solution) is 8.9, water-insoluble is 0.12%, fluorochemical is that 9.02mg/kg, arsenic content are that 2.03mg/kg, heavy metal content are 8.9mg/kg, and loss on drying is 1.78%.
Embodiment 2
A production method for dipotassium hydrogen phosphate, specifically comprises the following steps:
(1) preparation of Ureaphil solution: Ureaphil solid is placed in to dissolving tank, a certain amount of water is added to dissolving tank, adopt 30r/min to stir, obtain Ureaphil solution, and be warming up to 45 ℃;
(2) add potassium hydroxide synthetic: with transferpump, Ureaphil solution to be delivered in reactive tank, and the ratio that is 1:2.05 according to the mol ratio of Ureaphil and potassium hydroxide adds the potassium hydroxide solid after metering in reactive tank, adopt the stirring velocity of 60r/min to stir simultaneously, and temperature of reaction is controlled to 90 ℃, reaction 70min, controlling terminal pH value is 9.5, obtains dipotassium hydrogen phosphate slip;
(3) crystallisation by cooling centrifugation: dipotassium hydrogen phosphate slip is transported in crystallizer and is cooled to below 35 ℃ with transferpump, crystallisation by cooling, after crystallize out, dipotassium hydrogen phosphate slurry pipeline transport is carried out to centrifugation to whizzer, obtain filtrate and filter cake, filtrate is urea soln, is sent to production of urea phosphate line; Filter cake is dipotassium hydrogen phosphate product, it is adopted in drying machine 90 ℃ be dried, and obtains dipotassium hydrogen phosphate product.
Sampling analysis, its physical and chemical index is that dipotassium hydrogen phosphate content is 98.15%, pH (10g/L solution) is 8.8, water-insoluble is 0.11%, fluorochemical is that 8.04mg/kg, arsenic content are that 2.41mg/kg, heavy metal content are 9.1mg/kg, and loss on drying is 1.82%.
Embodiment 3
A production method for dipotassium hydrogen phosphate, specifically comprises the following steps:
(1) preparation of potassium hydroxide solution: potassium hydroxide solid is placed in dissolving tank, adds dissolving tank by a certain amount of water, adopts 30r/min to stir, and obtains potassium hydroxide solution;
(2) add Ureaphil synthetic: to adopt transferpump to be delivered in reactive tank potassium hydroxide solution, and the ratio that is 1:2 according to the mol ratio of Ureaphil and potassium hydroxide adds Ureaphil solid and its hybrid reaction after metering, adopt the speed of 55r/min to stir simultaneously, and control temperature of reaction at 70 ℃, reaction 50min, controlling endpoint pH is 8.5, obtains dipotassium hydrogen phosphate slip;
(3) crystallisation by cooling centrifugation: adopt transferpump to be transported in crystallizer dipotassium hydrogen phosphate slip and be cooled to below 30 ℃, crystallisation by cooling, after crystallize out, dipotassium hydrogen phosphate slurry pipeline transport to whizzer is carried out to centrifugation, obtain filtrate and filter cake, filtrate is urea soln, is sent to production of urea phosphate line; Filter cake is dipotassium hydrogen phosphate product, and it is dry with 90 ℃ in drying machine, obtains dipotassium hydrogen phosphate product.
Sampling analysis, its physical and chemical index dipotassium hydrogen phosphate content is 98.31%, pH (10g/L solution) is 9.1, water-insoluble is 0.17%, fluorochemical is that 9.06mg/kg, arsenic content are that 2.71mg/kg, heavy metal content are 9.4mg/kg, and loss on drying is 1.77%.
Embodiment 4
A production method for dipotassium hydrogen phosphate, specifically comprises the following steps:
(1) preparation of potassium hydroxide solution: potassium hydroxide solid is placed in dissolving tank, by adding dissolving tank after a certain amount of water metering, adopts 30r/min to stir, and obtains potassium hydroxide solution;
(2) add Ureaphil synthetic: to adopt transferpump to be delivered in reactive tank potassium hydroxide solution, and add Ureaphil liquid and its hybrid reaction after the ratio that is 1:2.03 according to the mol ratio of Ureaphil and potassium hydroxide metering, by the speed of 65r/min, stir simultaneously, and control temperature of reaction at 80 ℃, reaction 40min, controlling endpoint pH is 9, obtains dipotassium hydrogen phosphate slip;
(3) crystallisation by cooling centrifugation: adopt transferpump to be transported in crystallizer dipotassium hydrogen phosphate slip and be cooled to below 38 ℃, crystallisation by cooling, after crystallize out, dipotassium hydrogen phosphate slurry pipeline transport to whizzer is carried out to centrifugation, obtain filtrate and filter cake, filtrate is urea soln, is sent to production of urea phosphate line; Filter cake is dipotassium hydrogen phosphate product, it is adopted in drying machine 90 ℃ be dried, and obtains dipotassium hydrogen phosphate product.
Sampling analysis, its physical and chemical index is that dipotassium hydrogen phosphate content is 98.26%, pH (10g/L solution) is 9.2, water-insoluble is 0.16%, fluorochemical is that 9.13mg/kg, arsenic content are that 2.22mg/kg, heavy metal content are 9.3mg/kg, and loss on drying is 1.64%.
Embodiment 5-8
A kind of production method of dipotassium hydrogen phosphate, other concrete steps are with embodiment 1-4, when salt of wormwood and potassium hydroxide all react with Ureaphil, first according to salt of wormwood, add and react with the mol ratio of Ureaphil 0.55:1, adopt again potassium hydroxide to react with its mixing solutions, add the molar weight of potassium hydroxide for consistent with salt of wormwood add-on, then can make dipotassium hydrogen phosphate product by stirring reaction.
Embodiment 9-12
A production method for dipotassium hydrogen phosphate, other concrete steps are with embodiment 1-4, when salt of wormwood and potassium hydroxide all react with Ureaphil, first according to the mol ratio of salt of wormwood and Ureaphil 0.45:1, add, and stir while adding, controlling temperature of reaction is 60 ℃, after stirring reaction 40min; Adopt potassium hydroxide to react with its mixing solutions, the molar weight that adds potassium hydroxide is for consistent with salt of wormwood add-on again, then by stirring reaction 20min, and to control endpoint pH be 8.8, can make dipotassium hydrogen phosphate product.
Embodiment 13-16
A production method for dipotassium hydrogen phosphate, other concrete steps are with embodiment 1-4, when salt of wormwood and potassium hydroxide all react with Ureaphil, first according to the mol ratio of salt of wormwood and Ureaphil 0.5:1, add, and stir while adding, controlling temperature of reaction is 80 ℃, after stirring reaction 30min; Adopt potassium hydroxide to react with its mixing solutions, the molar weight that adds potassium hydroxide is for consistent with salt of wormwood add-on again, then by stirring reaction 10min, and to control endpoint pH be 9.2, can make dipotassium hydrogen phosphate product.
At this, it is important to point out: above embodiment only limits to understand technical scheme of the present invention is further elaborated; and can not be interpreted as technical scheme of the present invention is done to further restriction; those skilled in the art is in the scope of above-described embodiment and technical scheme of the present invention; that makes does not have outstanding substantive distinguishing features and significant progressive improvement with the present invention, still belongs to protection category of the present invention.
Claims (10)
1. a production method for dipotassium hydrogen phosphate, is characterized in that: adopt Ureaphil to react with potassium hydroxide, and to control temperature of reaction be 50 ℃-90 ℃, and stirring reaction 20-70min, control terminal pH value is 8-9.5, makes dipotassium hydrogen phosphate product.
2. the production method of dipotassium hydrogen phosphate as claimed in claim 1, comprises the following steps:
(1) preparation of Ureaphil solution: Ureaphil is placed in to dissolving tank, adds a certain amount of water, adopt the speed of 30r/min to stir, obtain Ureaphil solution, and be warming up to 45 ℃;
(2) add potassium hydroxide synthetic: Ureaphil solution is delivered in reactive tank with transferpump, and be 1:(1.95-2.05 according to the mol ratio of Ureaphil and potassium hydroxide) ratio be metered into potassium hydroxide and its hybrid reaction, and maintain temperature of reaction at 50 ℃-90 ℃, according to the stirring velocity stirring reaction 20-70min of 30r/min, when control endpoint pH is 8-9.5, obtain dipotassium hydrogen phosphate slip;
(3) crystallisation by cooling centrifugation: dipotassium hydrogen phosphate slip is transported in crystallizer and is cooled to below 40 ℃ with transferpump, crystallisation by cooling, after crystallize out, dipotassium hydrogen phosphate slurry pipeline transport to whizzer is carried out to centrifugation, obtain filtrate and filter cake, filtrate is urea soln, is sent to production of urea phosphate line; Filter cake is dipotassium hydrogen phosphate product, and it is dry with 90 ℃ in drying machine, obtains dipotassium hydrogen phosphate product.
3. the production method of dipotassium hydrogen phosphate as claimed in claim 1 or 2, is characterized in that: described Ureaphil reacts with potassium hydroxide, for Ureaphil solid reacts with potassium hydroxide solution.
4. the production method of dipotassium hydrogen phosphate as claimed in claim 1 or 2, is characterized in that: described Ureaphil reacts with potassium hydroxide, for Ureaphil solution reacts with potassium hydroxide solution.
5. the production method of dipotassium hydrogen phosphate as claimed in claim 1 or 2, is characterized in that: described Ureaphil reacts with potassium hydroxide, is Ureaphil solution and potassium hydroxide solid reaction.
6. the production method of dipotassium hydrogen phosphate as claimed in claim 1 or 2, is characterized in that: described temperature of reaction is 50-80 ℃.
7. the production method of dipotassium hydrogen phosphate as claimed in claim 1 or 2, is characterized in that: described temperature of reaction is 70 ℃.
8. the production method of dipotassium hydrogen phosphate as claimed in claim 2, is characterized in that: described Ureaphil and the mol ratio of potassium hydroxide are 1:(1.95-2).
9. the production method of dipotassium hydrogen phosphate as claimed in claim 2, is characterized in that: described Ureaphil and the mol ratio of potassium hydroxide are 1:(2-2.05).
10. the production method of dipotassium hydrogen phosphate as claimed in claim 1 or 2, it is characterized in that: described dipotassium hydrogen phosphate product, its physical and chemical index is that dipotassium hydrogen phosphate content is that 98.15-98.31%, pH (10g/L solution) are that 8.9-9.2, water-insoluble are that 0.11-0.17%, fluorochemical are that 8.04-9.13mg/kg, arsenic content are that 2.03-2.71mg/kg, heavy metal content are 8.9-9.4mg/kg, and loss on drying is 1.64-1.82%.
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| CN104249998A (en) * | 2014-09-19 | 2014-12-31 | 贵阳中化开磷化肥有限公司 | Method for co-producing composite fertilizer special for peanuts during preparation of monopotassium phosphate |
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| CN104310348A (en) * | 2014-09-19 | 2015-01-28 | 贵州大学 | Method for simultaneously preparing potassium dihydrogen phosphate and special fertilizer for Phyllostachys edulis |
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| CN104250001B (en) * | 2014-09-19 | 2016-03-16 | 贵州开磷集团股份有限公司 | A kind of production method preparing potassium primary phosphate by-product fertilizer special for tobacco |
| CN104291296B (en) * | 2014-09-19 | 2016-09-07 | 贵州开磷集团股份有限公司 | A kind of production method preparing dipotassium hydrogen phosphate by-product tomato special fertilizer |
| RU2597117C1 (en) * | 2015-07-14 | 2016-09-10 | Открытое акционерное общество "Реатэкс" (ОАО "Реатэкс") | Method of producing disubstituted potassium phosphate |
| CN106006592A (en) * | 2016-05-26 | 2016-10-12 | 河南精康制药有限公司 | Preparation technique of medicinal dipotassium hydrogen phosphate |
| CN107324301A (en) * | 2017-08-10 | 2017-11-07 | 贵阳开磷化肥有限公司 | A kind of production method of PHOSPHORIC ACID TECH.GRADE potassium dihydrogen coproduction Water soluble fertilizer |
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