CN102249204A - Method for preparing dipotassium phosphate - Google Patents
Method for preparing dipotassium phosphate Download PDFInfo
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- CN102249204A CN102249204A CN2011101591611A CN201110159161A CN102249204A CN 102249204 A CN102249204 A CN 102249204A CN 2011101591611 A CN2011101591611 A CN 2011101591611A CN 201110159161 A CN201110159161 A CN 201110159161A CN 102249204 A CN102249204 A CN 102249204A
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- reaction
- hydrogen phosphate
- dipotassium phosphate
- dipotassium hydrogen
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Abstract
The invention discloses a method for preparing dipotassium phosphate, which comprises the following steps of: putting phosphoric acid and potassium hydroxide into a reaction kettle according to stoichiometry to perform a neutralization reaction, controlling the reaction temperature at most 90 DEG C, regulating the PH value of an end point as 8.9-9.5 while finishing the neutralization reaction, controlling the proportion between 1.50 and 1.55, adding active carbon in accordance with 3 kg/t into the prepared material and stirring for 30-40 min, decolorizing, and then filtering, putting the prepared filtrate into a concentration kettle for concentrating and crystallizing, putting the material into a centrifugal machine for dehydrating when the total volume of the concentrated solution is two fifths of the volume of the input liquid, drying the dehydrated material at a temperature between 60 DEG C and 70 DEG C through a fluidized bed to prepare the dipotassium phosphate product, meanwhile, returning the dehydrated mother solution to the reaction kettle for cycle use. The method for preparing dipotassium phosphate, disclosed by the invention, has a simple technology and high quality of the product and is convenient for industrial application; moreover, the cost is reduced through returning the dehydrated mother solution to the reaction kettle for the cycle use.
Description
Technical field:
The present invention relates generally to a kind of preparation method of dipotassium hydrogen phosphate.
Background technology:
With regard to the present production method of dipotassium hydrogen phosphate, adopt neutralisation mostly, this method 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 the quality product height is convenient to the preparation method of the dipotassium hydrogen phosphate of industrial application.
The present invention is achieved by the following technical solutions:
A kind of preparation method of dipotassium hydrogen phosphate is characterized in that this method steps comprises:
A. phosphoric acid and potassium hydroxide are dropped into reactor by stoichiometry and carry out neutralization reaction, control reaction temperature≤90 ℃, when neutralization reaction finished, regulating the terminal point pH value was 8.9-9.5, specific gravity control is at 1.50-1.55;
B. in the material that the A step makes, add gac and stir 30-40min, decolour, again after filtration, gained filtrate is dropped into concentrated, crystallization in the concentration kettle, 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 60 ℃-70 ℃, makes the dipotassium hydrogen phosphate product;
C. the mother liquor after dehydration returns A step reaction still and recycles.
The preparation method of described a kind of dipotassium hydrogen phosphate is characterized in that: the mother liquor that recycles among the described preparation method is discarded when percentage concentration surpasses 50ppm.
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 after the dehydration 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 dipotassium hydrogen phosphate is characterized in that this method steps comprises:
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 8.9-9.5, water addition ratio heavily is controlled at 1.50-1.55;
B. in the material that the A step makes, add gac and stir 30-40min by 3kg/t, decolour, again after filtration, gained filtrate is dropped into concentrated, crystallization in the concentration kettle, when the mass crystallization particle occurring, blowing is gone into centrifuge dewatering, and dehydration back material carries out drying through fluidized-bed with 60 ℃-70 ℃, makes the dipotassium hydrogen phosphate product;
Mother liquor after dehydration returns A step reaction still and recycles.The mother liquor that recycles is discarded when percentage concentration surpasses 50ppm.
Claims (2)
1. the preparation method of a dipotassium hydrogen phosphate is characterized in that this method steps comprises:
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 8.9-9.5, specific gravity control is at 1.50-1.55;
B. in the material that the A step makes, add gac and stir 30-40min, decolour, again after filtration, gained filtrate is dropped into concentrated, crystallization in the concentration kettle, when the mass crystallization particle occurring, blowing is gone into centrifuge dewatering, and dehydration back material carries out drying through fluidized-bed with 60 ℃-70 ℃, makes the dipotassium hydrogen phosphate product;
C. the mother liquor after dehydration returns A step reaction still and recycles.
2. the preparation method of a kind of dipotassium hydrogen phosphate according to claim 1 is characterized in that: the mother liquor that recycles among the described preparation method is discarded when percentage concentration surpasses 50ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101591611A CN102249204A (en) | 2011-06-15 | 2011-06-15 | Method for preparing dipotassium phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101591611A CN102249204A (en) | 2011-06-15 | 2011-06-15 | Method for preparing dipotassium phosphate |
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| Publication Number | Publication Date |
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| CN102249204A true CN102249204A (en) | 2011-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101591611A Pending CN102249204A (en) | 2011-06-15 | 2011-06-15 | Method for preparing dipotassium phosphate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN106241766A (en) * | 2016-08-16 | 2016-12-21 | 湖北兴发化工集团股份有限公司 | A kind of without burnt high-pure anhydrous dipotassium hydrogen phosphate production system and technique |
| CN108408706A (en) * | 2018-04-13 | 2018-08-17 | 江苏瑞丰医药有限公司 | A kind of preparation method of food-grade anhydrous disodium hydrogen phosphate |
-
2011
- 2011-06-15 CN CN2011101591611A patent/CN102249204A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2597117C1 (en) * | 2015-07-14 | 2016-09-10 | Открытое акционерное общество "Реатэкс" (ОАО "Реатэкс") | Method of producing disubstituted potassium 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 |
| 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 |
| 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 |
| CN106241766A (en) * | 2016-08-16 | 2016-12-21 | 湖北兴发化工集团股份有限公司 | A kind of without burnt high-pure anhydrous dipotassium hydrogen phosphate production system and technique |
| CN108408706A (en) * | 2018-04-13 | 2018-08-17 | 江苏瑞丰医药有限公司 | A kind of preparation method of food-grade anhydrous disodium hydrogen phosphate |
| CN108408706B (en) * | 2018-04-13 | 2021-12-24 | 江苏瑞丰医药有限公司 | Preparation method of food-grade anhydrous disodium hydrogen phosphate |
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Application publication date: 20111123 |