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Preparation method of superior pure sodium fluoride

A pure sodium fluoride, high-grade technology, applied in the field of inorganic compound preparation, can solve the problems of high and high impurity content, which can only be used in welding flux, low product purity, etc., to achieve low impurity content and easy control of the reaction process , the effect of high purity

Inactive Publication Date: 2016-02-03
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-grade pure sodium fluoride is widely used as a medical antiseptic, dental anti-corrosion agent, and fluoridation treatment of drinking water. The current preparation method of sodium fluoride is the sodium fluorosilicate method, which is the reaction of sodium fluorosilicate and ammonium sulfate. Then add sodium hydroxide to generate sodium fluoride, the product has low purity and high impurity content. The product produced by this method has low purity and high impurity content, so it can only be used as a raw material for welding flux and papermaking.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of superior grade pure sodium fluoride, the steps of the preparation method are:

[0015] (1) Crystallization: 1KgNa 2 CO 3 Put into the polytetrafluoroethylene reactor, then under constant stirring, slowly add 40% hydrofluoric acid to PH=8 and then stop, use 1.25kg of 40wt% hydrofluoric acid, until no carbon dioxide escapes to be the end point, Suction and filter out the crystals;

[0016] (2) Washing: wash twice with distilled water, and dry at 35° C. to obtain high-grade pure sodium fluoride.

[0017] The sodium carbonate described in the step: the weight ratio of hydrofluoric acid (40wt%) is 1:1.25~1.30.

Embodiment 2

[0019] A preparation method of superior grade pure sodium fluoride, the steps of the preparation method are:

[0020] (1) Crystallization: 1.2KgNa 2 CO 3 Put it into a Teflon reactor, then slowly add 40% hydrofluoric acid to PH=9 under constant stirring, then stop, use up 1.3kg of 40% hydrofluoric acid, until no carbon dioxide escapes, which is the end point, Suction and filter out the crystals;

[0021] (2) Washing: wash 3 times with distilled water, and dry at 40°C to obtain high-grade pure sodium fluoride.

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PUM

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Abstract

The invention relates to a preparation method of superior pure sodium fluoride. The method comprises the steps of (1) crystallization and (2) washing. In the crystallization step, Na2CO3 is placed in a polytetrafluorine reactor; 40% hydrofluoric acid is slowly added under stirring, until the pH value is 8, wherein 40wt% of hydrofluoric acid is added, and a terminal point is reached when no carbon dioxide escapes; suction filtration is carried out such that crystals are obtained. In the washing step, the crystals are washed twice with distilled water, and are dried under a temperature of 35 DEG C, such that superior pure sodium fluoride is obtained. The preparation method provided by the invention has the advantages of simple process steps, easy-to-control reaction process, high production efficiency, low impurity content, and high superior pure sodium fluoride product purity.

Description

technical field [0001] The invention relates to the field of preparation methods of inorganic compounds, in particular to a preparation method of high-grade pure sodium fluoride. Background technique [0002] High-grade pure sodium fluoride is widely used as a medical antiseptic, dental anti-corrosion agent, and fluoridation treatment of drinking water. The current preparation method of sodium fluoride is the sodium fluorosilicate method, which is the reaction of sodium fluorosilicate and ammonium sulfate. Add sodium hydroxide again to generate sodium fluoride, the product has low purity and high impurity content, and the product produced by this method has low purity and high impurity content, so it can only be used as a raw material for welding flux and papermaking. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing superior grade pure sodium fluoride with low impurit...

Claims

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Application Information

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IPC IPC(8): C01D3/02
Inventor 胡建华
Owner TIANJIN CHEM REAGENT RES INST
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