CN103832989A - Preparation method of high-purity disodium hydrogen phosphate - Google Patents
Preparation method of high-purity disodium hydrogen phosphate Download PDFInfo
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- CN103832989A CN103832989A CN201210526009.7A CN201210526009A CN103832989A CN 103832989 A CN103832989 A CN 103832989A CN 201210526009 A CN201210526009 A CN 201210526009A CN 103832989 A CN103832989 A CN 103832989A
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- disodium hydrogen
- purity
- hydrogen phosphate
- phosphoric acid
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Abstract
The invention discloses a preparation method of high-purity disodium hydrogen phosphate. The preparation method comprises the following steps: (A) slowly adding sodium hydrogen carbonate (NaHCO3) into phosphoric acid (H3PO4) solution, carrying out neutral reaction, controlling the reaction temperature to 80-100 DEG C for 2 hours, controlling pH value to 8.7-9.2, and then naturally cooling, thereby obtaining a disodium hydrogen phosphate solution; (B) carrying out centrifugal dewatering on the obtained disodium hydrogen phosphate solution, evaporating, concentrating, spraying a product quickly for one time by use of deionized water so as to remove absorbed impurity molecules on the surface of precipitate, and carrying out centrifugal dewatering, thereby obtaining a disodium hydrogen phosphate crystal; (C) feeding the obtained disodium hydrogen phosphate into a rake type drying machine for drying with the drying conditions that the gas inlet temperature is 120 DEG C, the flowing speed of fluidized gas is 0.3m<3>/s and the drying time is 15 minutes, and finally stabilizing the process condition to obtain the disodium hydrogen phosphate with the purity of 99.6%. Compared with the prior art, the preparation method disclosed by the invention has the beneficial effects that the optimal matching ratio of the materials, the pH value and the temperature control range are determined, so that the purity of the disodium hydrogen phosphate obtained by reaction is improved.
Description
Technical field
The present invention relates to chemical technology field, especially a kind of high-purity phosphoric acid disodium hydrogen preparation method.
Background technology
Sodium phosphate dibasic, molecular formula is Na2HPO4, water white transparency monoclinic system prismatic crystal, generally there is density 1.52g/cm3,34.6 ℃ of fusing points with the form of 12 crystal water, easy-weathering in air, very easily loses five molecular crystal water and forms seven water things (Na2HPO47H2O).Water soluble, be insoluble to alcohol, the aqueous solution is slight alkalinity reaction (PH of 0.1-1N solution is about 9.0), lose crystal water at 100 ℃ and form anhydride, 250 ℃ time, decompose coking sodium phosphate, highly purified Sodium phosphate dibasic product is at functional materials, biotechnology, the demand of the aspects such as agricultural science and technology is also more and more, therefore highly purified Sodium phosphate dibasic has good economic benefit and social benefit, owing to being subject to the place of production of raw material, grade, the impact of the factors such as price, the production technique of the employing of different manufacturers is also different, the purity difference of its product is also very large, the production method of Sodium phosphate dibasic mainly contains neutralisation, extraction process, ion exchange method, double decomposition, direct method, crystallization process and electrolytic process etc., the main direct method that adopts of Sodium phosphate dibasic preparation that purity is higher.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of preparation method of direct method explained hereafter high-purity phosphoric acid disodium hydrogen is provided.
The technical solution used in the present invention is: a kind of high-purity phosphoric acid disodium hydrogen preparation method, comprises the following steps:
A, sodium bicarbonate (NaHCO3) is slowly joined in phosphoric acid (H3PO4) solution, carry out neutralization reaction, temperature of reaction is controlled at 80～100 ℃, 2h, pH value is controlled between 8.7-9.2, and then cooling naturally, obtains disodium phosphate soln.
Chemical equation:
H3PO4+NaHCO3～NaH2PO4+H2O+CO2
B, gained disodium phosphate soln is carried out to centrifuge dehydration, evaporation concentration, then with deionized water to the quick drip washing of product once, remove the absorption impurity molecule of precipitation surface, then centrifuge dehydration, obtain Sodium phosphate dibasic crystal.
C, gained Sodium phosphate dibasic crystal is sent into rake type drier be dried, drying conditions is 120 ℃ of inlet air temperature, fluidized gas flow velocity 0.3m3/s, 15 minutes time of drying, after last stabilization process condition potassium primary phosphate purity be 99.6%.
Raw material sodium bicarbonate purity described in aforesaid method is 99%, and phosphoric acid is technical grade.
Raw material sodium bicarbonate described in aforesaid method and the ratio of weight and number of phosphoric acid 1: 1.15.
Beneficial effect of the present invention: the present invention compared with the prior art, has determined determining and temperature controlled scope of the best proportioning of raw material and pH value, therefore reacts to such an extent that the purity of Sodium phosphate dibasic is improved.
Embodiment
Below in conjunction with specific embodiment, the present invention is further described.
Embodiment
A kind of high-purity phosphoric acid disodium hydrogen preparation method, step is as follows: A, the sodium bicarbonate that is 99% by purity slowly join in PHOSPHORIC ACID TECH.GRADE solution, ratio of weight and number is 1: 1.15, carry out neutralization reaction, temperature of reaction is controlled at 80～100 ℃, 2h, and pH value is controlled between 8.7-9.2, then cooling naturally, obtains disodium phosphate soln.
B, gained disodium phosphate soln is carried out to centrifuge dehydration, evaporation concentration, then with deionized water to the quick drip washing of product once, remove the absorption impurity molecule of precipitation surface, then centrifuge dehydration, obtain Sodium phosphate dibasic crystal.
C, gained Sodium phosphate dibasic crystal is sent into rake type drier be dried, drying conditions is 120 ℃ of inlet air temperature, fluidized gas flow velocity 0.3m3/s, 15 minutes time of drying, after last stabilization process condition Sodium phosphate dibasic purity be 99.6%, packing.
Claims (2)
1. a high-purity phosphoric acid disodium hydrogen preparation method, is characterized in that comprising the following steps:
A, sodium bicarbonate (NaHCO3) is slowly joined in phosphoric acid (H3PO4) solution, carry out neutralization reaction, temperature of reaction is controlled at 80～100 ℃, 2h, pH value is controlled between 8.7-9.2, and then cooling naturally, obtains disodium phosphate soln.
B, gained disodium phosphate soln is carried out to centrifuge dehydration, evaporation concentration, then with deionized water to the quick drip washing of product once, remove the absorption impurity molecule of precipitation surface, then centrifuge dehydration, obtain Sodium phosphate dibasic crystal.
C, gained Sodium phosphate dibasic crystal is sent into rake type drier be dried, drying conditions is 120 ℃ of inlet air temperature, fluidized gas flow velocity 0.3m3/s, 15 minutes time of drying, after last stabilization process condition potassium primary phosphate purity be 99.6%.
2. a kind of high-purity phosphoric acid disodium hydrogen preparation method according to claim 1, is characterized in that: described raw material sodium bicarbonate purity is 99%, and phosphoric acid is technical grade, the ratio of weight and number of sodium bicarbonate and phosphoric acid 1: 1.15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210526009.7A CN103832989A (en) | 2012-11-27 | 2012-11-27 | Preparation method of high-purity disodium hydrogen phosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210526009.7A CN103832989A (en) | 2012-11-27 | 2012-11-27 | Preparation method of high-purity disodium hydrogen phosphate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103832989A true CN103832989A (en) | 2014-06-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201210526009.7A Pending CN103832989A (en) | 2012-11-27 | 2012-11-27 | Preparation method of high-purity disodium hydrogen phosphate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103832989A (en) |
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2012
- 2012-11-27 CN CN201210526009.7A patent/CN103832989A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 郭小林等: "剂级磷酸氢二钠的生产控制", 《河南化工》 * |
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Application publication date: 20140604 |