CN102285649A - Method for preparing monopotassium phosphate - Google Patents
Method for preparing monopotassium phosphate Download PDFInfo
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- CN102285649A CN102285649A CN2011101591630A CN201110159163A CN102285649A CN 102285649 A CN102285649 A CN 102285649A CN 2011101591630 A CN2011101591630 A CN 2011101591630A CN 201110159163 A CN201110159163 A CN 201110159163A CN 102285649 A CN102285649 A CN 102285649A
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Abstract
The invention discloses a method for preparing monopotassium phosphate, which comprises the following steps: adding phosphoric acid and potassium hydroxide into a reaction kettle according to stoichiometric amount for neutralization; keeping the reaction temperature less than or equal to 90 DEG C; at the end of the neutralization, regulating a terminal pH value to 4.0 to 4.6 and density to 1.35 to 1.40kg/m<3>, adding active carbon into prepared materials, stirring for 30 to 40 minutes, decolorizing, filtering to obtain filtrate, and adding obtained filtrate into a concentration kettle for concentration and crystallization under a concentration pressure of less than or equal to 0.05MPa; when the total volume of the concentrated solution is two fifths of that of the added liquid, discharging into a centrifuge for dewatering; allowing the dewatered material to flow through a fluidized bed and drying at 80 to 100 DEG C; and thus, obtaining a monopotassium phosphate product, and at the same time returning dewatered mother solution to a reaction kettle for circular use. In the invention, the process is simple, the product quality is high, the industrial use is convenient, and the cost is reduced by returning the dewatered mother solution to a reaction kettle for circular use.
Description
Technical field:
The present invention relates to a kind of preparation method of potassium primary phosphate.
Background technology:
Potassium primary phosphate is phosphorus and all higher phosphoric acid salt of potassium content, and with regard to present production method, as complex process such as double decomposition, extraction process, integrated processs, flow process is long, and quality product is not high.Neutralisation technology is simple, Production Flow Chart short, and quality product height, but cost height pollute heavy.
Summary of the invention:
The object of the invention is exactly in order to remedy the defective of prior art, to provide a kind of cost lower, and technology is simple, and mother liquor refluxes and uses, and the quality product height is convenient to the preparation method of the potassium primary phosphate of industrial application.
The present invention is achieved by the following technical solutions:
A kind of preparation method of potassium primary phosphate is characterized in that this method may further comprise the steps:
A. phosphoric acid and potassium hydroxide are dropped into reactor by stoichiometry and carry out neutralization reaction, control reaction temperature≤90 ℃, when reaction finished, regulating the terminal point pH value was 4.0-4.6, specific gravity control is at 1.35-1.40;
B. in the material that the A step makes, add gac, stir, decolour, again after filtration, gained filtrate is dropped into concentrated, crystallization in the concentration kettle, concentrate pressure≤0.05Mpa, blowing is gone into centrifuge dewatering, and dehydration back material carries out drying through fluidized-bed with 80 ℃-100 ℃, makes potassium dihydrogen phosphate product;
C. the mother liquor after dehydration returns A step reaction still and recycles.
The every circulation of the mother liquor that recycles among the described preparation method is discarded for 5 times.
When the concentrated solution cumulative volume be about drop into liquid long-pending 2/5ths the time, blowing is gone into centrifuge dewatering.
This method principal reaction formula is:
Advantage of the present invention is:
Technology of the present invention is simple, and the quality product height is convenient to industrial application, and returns reactor by the mother liquor that will dewater and recycle and reduced cost.
Description of drawings:
Fig. 1 is a process flow sheet of the present invention.
Embodiment
A kind of preparation method of potassium primary phosphate is characterized in that this method may further comprise the steps:
A. phosphoric acid and potassium hydroxide are dropped into reactor by stoichiometry and carry out neutralization reaction, control reaction temperature≤90 ℃, when reaction finished, regulating the terminal point pH value was 4.0-4.6, adds water management proportion at 1.35-1.40;
B. in the material that the A step makes, add gac by 3 kilograms/ton, stirred 30-40 minute, decolour, again after filtration, gained filtrate is dropped into concentrated, crystallization in the concentration kettle, concentrate pressure≤0.05Mpa, when the concentrated solution cumulative volume be about drop into liquid long-pending 2/5ths the time, blowing is gone into centrifuge dewatering, and dehydration back material carries out drying through fluidized-bed with 80 ℃-100 ℃, makes potassium dihydrogen phosphate product;
Mother liquor after dehydration returns A step reaction still and recycles 5 times.
Claims (3)
1. the preparation method of a potassium primary phosphate is characterized in that this method may further comprise the steps:
A. phosphoric acid and potassium hydroxide are dropped into reactor by stoichiometry and carry out neutralization reaction, control reaction temperature≤90 ℃, when reaction finished, regulating the terminal point pH value was 4.0-4.6, specific gravity control is at 1.35-1.40;
B. in the material that the A step makes, add gac, stir, decolour, again after filtration, gained filtrate is dropped into concentrated, crystallization in the concentration kettle, concentrate pressure≤0.05Mpa, blowing is gone into centrifuge dewatering, and dehydration back material carries out drying through fluidized-bed with 80 ℃-100 ℃, makes potassium dihydrogen phosphate product;
C. the mother liquor after dehydration returns A step reaction still and recycles.
2. the preparation method of a kind of potassium primary phosphate according to claim 1 is characterized in that: the every circulation of the mother liquor that recycles among the described preparation method 5 times is discarded.
3. the preparation method of a kind of potassium primary phosphate according to claim 1 is characterized in that: when the concentrated solution cumulative volume be about drop into liquid long-pending 2/5ths the time, blowing is gone into centrifuge dewatering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101591630A CN102285649A (en) | 2011-06-15 | 2011-06-15 | Method for preparing monopotassium phosphate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101591630A CN102285649A (en) | 2011-06-15 | 2011-06-15 | Method for preparing monopotassium phosphate |
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| CN102285649A true CN102285649A (en) | 2011-12-21 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103879981A (en) * | 2014-03-19 | 2014-06-25 | 钟林 | Method for preparing potassium dihydrogen phosphate by using extraction residual acid of phosphoric acid |
| CN105883739A (en) * | 2016-05-26 | 2016-08-24 | 河南精康制药有限公司 | Preparation method of medicinal potassium dihydrogen phosphate |
| CN105948011A (en) * | 2016-05-06 | 2016-09-21 | 四川安达农森科技股份有限公司 | Preparation method of potassium dihydrogen phosphate |
| CN107188146A (en) * | 2017-07-18 | 2017-09-22 | 禄丰天宝磷化工有限公司 | A kind of production technology of feed grade potassium dihydrogen phosphate |
| CN107311134A (en) * | 2017-07-18 | 2017-11-03 | 禄丰天宝磷化工有限公司 | A kind of phosphoric acid method produces the production technology of feed grade potassium dihydrogen phosphate |
| CN107804832A (en) * | 2017-11-16 | 2018-03-16 | 达州瓮福蓝剑化工有限责任公司 | A kind of neutralized by the heating of dense mother liquor obtains the method for potassium dihydrogen phosphate |
| CN108264030A (en) * | 2018-03-16 | 2018-07-10 | 连云港西都生化有限公司 | A kind of preparation method of food grade phosphoric acid hydrogen dipotassium |
| CN110681487A (en) * | 2019-09-27 | 2020-01-14 | 瓮福达州化工有限责任公司 | Iron removing system and preparation process thereof |
| CN113336209A (en) * | 2021-04-07 | 2021-09-03 | 山东鼎欣生物科技有限公司 | Method for preparing monopotassium phosphate by constant pH |
-
2011
- 2011-06-15 CN CN2011101591630A patent/CN102285649A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103879981A (en) * | 2014-03-19 | 2014-06-25 | 钟林 | Method for preparing potassium dihydrogen phosphate by using extraction residual acid of phosphoric acid |
| CN103879981B (en) * | 2014-03-19 | 2016-02-17 | 钟林 | A kind of method utilizing phosphoric acid raffinate to prepare potassium primary phosphate |
| CN105948011A (en) * | 2016-05-06 | 2016-09-21 | 四川安达农森科技股份有限公司 | Preparation method of potassium dihydrogen phosphate |
| CN105883739A (en) * | 2016-05-26 | 2016-08-24 | 河南精康制药有限公司 | Preparation method of medicinal potassium dihydrogen phosphate |
| CN105883739B (en) * | 2016-05-26 | 2018-03-06 | 河南精康制药有限公司 | A kind of preparation method of pharmaceutical grade potassium dihydrogen phosphate |
| CN107311134A (en) * | 2017-07-18 | 2017-11-03 | 禄丰天宝磷化工有限公司 | A kind of phosphoric acid method produces the production technology of feed grade potassium dihydrogen phosphate |
| CN107188146A (en) * | 2017-07-18 | 2017-09-22 | 禄丰天宝磷化工有限公司 | A kind of production technology of feed grade potassium dihydrogen phosphate |
| CN107804832A (en) * | 2017-11-16 | 2018-03-16 | 达州瓮福蓝剑化工有限责任公司 | A kind of neutralized by the heating of dense mother liquor obtains the method for potassium dihydrogen phosphate |
| CN108264030A (en) * | 2018-03-16 | 2018-07-10 | 连云港西都生化有限公司 | A kind of preparation method of food grade phosphoric acid hydrogen dipotassium |
| CN108264030B (en) * | 2018-03-16 | 2021-04-20 | 连云港西都食品配料有限公司 | Preparation method of food-grade dipotassium hydrogen phosphate |
| CN110681487A (en) * | 2019-09-27 | 2020-01-14 | 瓮福达州化工有限责任公司 | Iron removing system and preparation process thereof |
| CN113336209A (en) * | 2021-04-07 | 2021-09-03 | 山东鼎欣生物科技有限公司 | Method for preparing monopotassium phosphate by constant pH |
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Application publication date: 20111221 |