CN102923685A - Production method of sodium monofluorophosphate - Google Patents
Production method of sodium monofluorophosphate Download PDFInfo
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- CN102923685A CN102923685A CN2012104932167A CN201210493216A CN102923685A CN 102923685 A CN102923685 A CN 102923685A CN 2012104932167 A CN2012104932167 A CN 2012104932167A CN 201210493216 A CN201210493216 A CN 201210493216A CN 102923685 A CN102923685 A CN 102923685A
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- sodium
- alkali
- phosphoric acid
- polymerization
- phosphorus
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Abstract
The invention relates to the technical field of preparation of chemicals and particularly relates to a method for reducing sodium monofluorophosphate synthesis temperature. The method is characterized in that phosphoric acid, alkali and sodium fluoride are taken as raw materials, the proportion of the phosphoric acid to the alkali is as follows: the mole ratio of sodium to phosphorus is 1:(1+/-0.5), and the proportion of polymerized sodium phosphate generated by the phosphoric acid and the alkali is as follows: the mole ratio of the phosphorus to fluorine is 1:(1+/-0.02). The production method has the beneficial effects that the process operation is simple, phosphoric acid, alkali and sodium fluoride are taken as raw materials, sodium monofluorophosphate with high added value can be produced, the production cost is lowered greatly, the economical and social values are good, and the method is easy to popularize and use.
Description
Technical field
The present invention relates to the manufacturing technology field of chemical, be specifically related to a kind of production method of sodium monoflurophosphate.Background technology
Sodium monoflurophosphate (MFP) is a kind of fluorine-containing inorganic fine chemicals of high added value, main as prevention of dental caries toothpaste with fluoride additive, also can be used as sanitas, sterilant, solubility promoter, oxidation on metal surface thing clean-out system, foodstuff additive, inhibiter, tap water fluoridize, regulate postmenopausal women blood fat and lipoprotein metabolism and increase bone amount, releasing osteoporosis etc.The method of traditional mode of production sodium monoflurophosphate has following several:
1, liquid phase neutralisation: be that raw material carries out liquid phase neutralization with phosphoric acid, hydrofluoric acid, yellow soda ash or sodium hydroxide, along with neutralizer evaporation, concentrated, crystallization, drying, can obtain the sodium monoflurophosphate product.But because hexafluorophosphoric acid corrodibility is extremely strong, special to device structure and material requirement, and production process control is difficult, and the production equipment investment is high, and corrosion product easily makes product introduce impurity.
2, gaseous fluoridizing method: take solid-state trisodium phosphate or Sodium phosphate dibasic as raw material, carry out reacting by heating by flow of hydrogen fluoride, just can make sodium monoflurophosphate.But the difficult control hydrogen fluoride of this method if the time that air-flow passes into is oversize, can react with sodium monoflurophosphate.
Summary of the invention
The objective of the invention is the defective for above-mentioned prior art, the defective that the object of the invention is to overcome prior art is provided, provide a kind of and can reduce the sodium monoflurophosphate synthesis temperature, thereby reduction production energy consumption, save production cost, and the product purity of producing out is high, the easy-operating method that reduces the sodium monoflurophosphate synthesis temperature of technique.
For achieving the above object, the present invention has adopted a kind of method that reduces the sodium monoflurophosphate synthesis temperature, take phosphoric acid, alkali and Sodium Fluoride as raw material, the ratio of phosphoric acid and alkali is: the mol ratio of sodium/phosphorus is 1: 1 ± 0.5, and the polymerization of sodium phosphate that phosphoric acid and alkali generate and the ratio of Sodium Fluoride are: the mol ratio of phosphorus/fluorine is 1: 1 ± 0.02.
Specifically may further comprise the steps:
A. with raw material phosphor bronsted lowry acids and bases bronsted lowry dry 12～28min under 420～520 ℃ of temperature, cooling, drying, polymerization generate polymerization of sodium phosphate;
B. even to polymerization of sodium phosphate adding Sodium Fluoride and ground and mixed;
C. the mixture with polymerization of sodium phosphate and Sodium Fluoride adds warm stove, frit reaction 15～20min under 590～650 ℃ temperature;
D. after reaction finishes, with melts cooling, pulverizing and screening, make the sodium monoflurophosphate product.
Described phosphoric acid, alkali and Sodium Fluoride all can adopt technical grade according to the needs to product purity.
The invention has the beneficial effects as follows:
Technological operation of the present invention is simple, is raw material with phosphoric acid, alkali and Sodium Fluoride, can produce the sodium monoflurophosphate of high added value, and production cost reduces greatly, has good economic worth and social value, is easy to promote the use of.
Description of drawings
The present invention is described in detail below in conjunction with embodiment and accompanying drawing, wherein:
Fig. 1 is preparation process schematic diagram of the present invention.
Embodiment
The employing raw material is as follows
Phosphorus acid content 99% technical grade
Alkali content 98.8% technical grade
Sodium Fluoride content 98.5% technical grade
Its preparation process specifically may further comprise the steps:
A kind of method that reduces the sodium monoflurophosphate synthesis temperature specifically may further comprise the steps take phosphoric acid, alkali and Sodium Fluoride as main raw material:
The dry 25min under 400～520 ℃ of temperature with raw material phosphoric acid 120kg and alkali 57kg, cooling, dry, polymerization generation polymerization of sodium phosphate;
Even to polymerization of sodium phosphate adding Sodium Fluoride 22.5kg and ground and mixed;
The mixture of polymerization of sodium phosphate and Sodium Fluoride is added warm stove, frit reaction 17min under 590～640 ℃ temperature;
After reaction finishes, with melts cooling, pulverizing and screening, make the sodium monoflurophosphate product.
Claims (1)
1. method that can reduce the sodium monoflurophosphate synthesis temperature, it is characterized in that: take phosphoric acid, alkali and Sodium Fluoride as raw material, the ratio of phosphoric acid and alkali is: the mol ratio of sodium/phosphorus is 1: 1 ± 0.5, and the polymerization of sodium phosphate that phosphoric acid and alkali generate and the ratio of Sodium Fluoride are: the mol ratio of phosphorus/fluorine is 1: 1 ± 0.02; Specifically may further comprise the steps:
A. with raw material phosphor bronsted lowry acids and bases bronsted lowry dry 10～30min under 400～520 ℃ of temperature, cooling, drying, polymerization generate polymerization of sodium phosphate;
B. even to polymerization of sodium phosphate adding Sodium Fluoride and ground and mixed;
C. the mixture with polymerization of sodium phosphate and Sodium Fluoride adds warm stove, frit reaction 15～18min under 590～640 ℃ temperature;
D. after reaction finishes, with melts cooling, pulverizing and screening, make the sodium monoflurophosphate product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104932167A CN102923685A (en) | 2012-11-28 | 2012-11-28 | Production method of sodium monofluorophosphate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104932167A CN102923685A (en) | 2012-11-28 | 2012-11-28 | Production method of sodium monofluorophosphate |
Publications (1)
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| CN102923685A true CN102923685A (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2012104932167A Pending CN102923685A (en) | 2012-11-28 | 2012-11-28 | Production method of sodium monofluorophosphate |
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| CN (1) | CN102923685A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1548366A (en) * | 2003-05-20 | 2004-11-24 | 蹇启贤 | Production process of sodium monofluorophosphate |
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- 2012-11-28 CN CN2012104932167A patent/CN102923685A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1548366A (en) * | 2003-05-20 | 2004-11-24 | 蹇启贤 | Production process of sodium monofluorophosphate |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20130213 |