Preparation of sodium monofluorophosphate

A technology of sodium monofluorophosphate and sodium metaphosphate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as low efficiency, long time required, fluorine loss, etc., achieve low energy consumption and reduce production costs , the effect of less loss

Inactive Publication Date: 2008-12-24
YUNNAN JIANGLIN GROUP
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Problems solved by technology

However, in this process, the stirred reactor needs to be heated externally to provide the energy required for drying and polymerization, which takes a long time and is inefficient, and because the content of metaphosphate in the polymeric phosphate is less, when the polyphosphoric acid is melted and combined with sodium fluoride Converted to sodium metaphosphate to release water vapor to hydrolyze fluoride, resulting in the volatilization of hydrogen fluoride gas and a certain loss of fluorine

Method used

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  • Preparation of sodium monofluorophosphate
  • Preparation of sodium monofluorophosphate

Examples

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Embodiment 1、2、3、4

[0028] The preparation method of sodium monofluorophosphate as shown in the figure. First, add powdered phosphoric anhydride, sodium carbonate, and sodium fluoride into the mixer 1 with stirring according to the weight ratio of Table 1, and the temperature of the mixture slowly rises by itself. When the temperature of the mixed material rises to 250°C, air cooling is introduced into the reactor to control the temperature of the material between 250°C and 380°C, until the reaction is completed, the material temperature drops, and when the material temperature drops below 100°C, it is released The material enters the intermediate bin, and the material obtained is a mixture of sodium metaphosphate and sodium fluoride.

[0029] The mixture is fed from the mixing intermediate bin 2 into a vortex heating and melting reactor 3, the residence time of the melt is controlled by controlling the feeding rate, and the temperature of the melt is controlled by adjusting the heating power. The ou...

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Abstract

The invention relates to a preparation method of sodium monofluorophosphate which comprises the steps of: mixing and reacting phosphoric anhydride and sodium carbonate to obtain sodium metaphosphate, then mixing and heating the sodium metaphosphate and sodium fluoride to a melting state. The sodium monofluorophosphate is obtained through reacting the mixture of sodium phosphate and sodium fluoride in the melting state. The art of the invention has advantages of simply technology, low energy consumption and low content of product impurity.

Description

Technical field [0001] The invention belongs to the field of inorganic chemicals and relates to the production of fluorine-containing phosphate. Background technique [0002] Sodium monofluorophosphate is a third-generation dental caries agent used in fluoride toothpaste. It is less toxic than sodium fluoride. It is also used in metal surface treatment, drinking water fluorination and special glass manufacturing. [0003] The traditional production methods of sodium monofluorophosphate are divided into the following categories: [0004] 1. Melting method: It is obtained by melting and polymerizing sodium metaphosphate and sodium fluoride as raw materials. The preparation of sodium metaphosphate requires drying and high-temperature polymerization processes, which makes the production of sodium metaphosphate high in energy consumption and easy to introduce impurities during the production process due to corrosion problems. This method is described in US patents US343605 and US51980...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455
Inventor 万荣惠马兴良张仕平李树华龚贵生后雪松徐文林
Owner YUNNAN JIANGLIN GROUP
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