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Preparation method of large-particle sodium bifluoride

A technology of sodium bifluoride and large particles, which is applied in the shape preparation of alkali metal halides and alkali metal fluorides, etc. It can solve the problems of difficulty in finding cooling equipment, increasing operation difficulty and production costs, and high energy consumption in the preparation process, achieving good economy Effects of benefits and social benefits

Active Publication Date: 2018-12-18
福建省漳平市九鼎氟化工有限公司
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Problems solved by technology

Although this method can produce large-particle sodium bifluoride products, it also has obvious disadvantages: first, anhydrous hydrogen fluoride is a highly dangerous material, and special protective measures need to be taken during transportation, storage and use, which greatly increases the difficulty of operation and production costs
In addition, because the reaction is carried out at high temperature, the energy consumption of the preparation process is high; and sodium bifluoride has a large solubility at high temperature, in order to reduce material loss, the material must be cooled after the reaction is completed
However, sodium bifluoride solution at high temperature is very corrosive, and it is difficult to find suitable cooling equipment
Therefore, this method is more difficult to produce in large quantities in industry.

Method used

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  • Preparation method of large-particle sodium bifluoride

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preparation example Construction

[0019] The present invention relates to a kind of preparation method of large particle sodium bifluoride, and described preparation method comprises the following steps:

[0020] (1) sodium carbonate solution preparation: sodium carbonate is dissolved in water with mass concentration 20~30wt%, obtains sodium carbonate solution;

[0021] (2) Synthetic reaction of sodium bifluoride: add an appropriate amount of sodium bifluoride seed crystals in the reactor, and slowly add the sodium carbonate solution and hydrofluoric acid obtained in step (1) into the reactor under stirring, and continue to stir the reaction after the addition, to obtain Suspension liquid; wherein, the molar ratio of sodium bifluoride: sodium carbonate: hydrogen fluoride is 0.1~0.2:1:4; the mass concentration of the hydrofluoric acid is 20~30wt%;

[0022] (3) Filtration: filter the suspension obtained in step (2) to obtain a sodium bifluoride filter cake;

[0023] (4) drying: drying the sodium bifluoride filt...

Embodiment 1

[0031] (1) preparation of sodium carbonate solution: take by weighing 54.0g (0.5mol) sodium carbonate and join in 216.0g water, stirring and dissolving, obtain the sodium carbonate solution of mass concentration 20wt%;

[0032] (2) Synthetic reaction of sodium hydrogen fluoride: add appropriate amount (100ml) sodium hydrogen fluoride mother liquor in reactor, add 6.2g (0.1mol) particle size again and be 100 purpose sodium hydrogen fluoride seed crystals, start stirring, the sodium carbonate solution obtained in step (1) Be that the hydrofluoric acid (containing hydrogen fluoride 2mol) of 30wt% with 133.4g concentration is added in the reactor simultaneously, by regulating the drop rate of two kinds of solutions in the feeding process, control sodium carbonate in the reactor when feeding simultaneously: the mol ratio of hydrogen fluoride is 1 : 4.1~4.2. After adding the hydrofluoric acid, all the remaining sodium carbonate solution was added to the reactor. The feeding time of...

Embodiment 2

[0036] (1) Sodium carbonate solution preparation: take by weighing 54.0g (0.5mol) sodium carbonate and join in 162.0g water, stir and dissolve, get the sodium carbonate solution of mass concentration 25wt%;

[0037] (2) Synthetic reaction of sodium hydrogen fluoride: add appropriate amount (100ml) sodium hydrogen fluoride mother liquor in reactor, then add 4.65g (0.075mol) particle size and be 80 purpose sodium hydrogen fluoride seed crystals, start stirring, the sodium carbonate solution obtained in step (1) Be that the hydrofluoric acid (containing hydrogen fluoride 2mol) of 25wt% with 160.0g concentration is added in the reactor simultaneously, by regulating the drop rate of two kinds of solutions in the feeding process, control sodium carbonate in the reactor when feeding simultaneously: the mol ratio of hydrogen fluoride is 1 : 4.1~4.2. After adding the hydrofluoric acid, all the remaining sodium carbonate solution was added to the reactor. The feeding time of hydrofluor...

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Abstract

The invention provides a preparation method of large-particle sodium bifluoride. The method comprises the following steps: (1) preparing a sodium carbonate solution dissolving sodium carbonate in water to obtain the sodium carbonate solution; (2) carrying out a synthesis reaction on the sodium bifluoride: adding an appropriate amount of sodium bifluoride seed crystals into a reactor, adding the sodium carbonate solution, obtained in the step (1), and hydrofluoric acid into the reactor at the same time while stirring, and continuously stirring for carrying out a reaction after the end of feeding so as to obtain suspension; (3) filtering: filtering the suspension obtained in the step (2) so as to obtain a sodium bifluoride filter cake; (4) drying: drying the sodium bifluoride filter cake obtained in the step (3) so as to obtain the large-particle sodium bifluoride product. The method provided by the invention solves the problems that the sodium bifluoride product prepared by the traditional preparation method is fine in particles, high in drying difficulty and poor in operating environment.

Description

technical field [0001] The invention relates to a preparation method of sodium hydrogen fluoride, in particular to a preparation method of large particle sodium hydrogen fluoride. Background technique [0002] Sodium bifluoride is white crystal or powder, mainly used as food protectant, animal and plant specimens and anatomical specimens preservative and preservative, also used in acid-resistant cement, masonry cleaner, disinfectant, glass etchant, leather treatment agent, welding , Brazing flux, starch protective agent, stainless steel pickling, tinplate production and textile processing, etc., are widely used. [0003] At present, the preparation method of sodium bifluoride is mostly to add hydrofluoric acid solution in the reactor, then add a theoretical amount of sodium carbonate solution under stirring to obtain sodium bifluoride slurry, and then filter and dry to obtain sodium bifluoride product. This preparation method of sodium bifluoride has an obvious shortcoming,...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01D3/24
CPCC01D3/02C01D3/24C01P2004/60
Inventor 喻鼎辉沈甫原李杰朱云陈克强
Owner 福建省漳平市九鼎氟化工有限公司
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