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A kind of preparation method of potassium hydrogen fluoride and preparation system thereof
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A technology of potassium hydrogen fluoride and potassium hydroxide, which is applied in the field of preparation method of potassium hydrogen fluoride and its preparation system, can solve the problems of large reaction heat release, high local temperature, unstable product yield, etc., and achieve small particle size and high purity Effect
Active Publication Date: 2020-10-13
FUJIAN YONGJING TECH CO LTD
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Potassium hydroxide reacts with anhydrous hydrogen fluoride gas to generate a large amount of heat, and excessive ventilation will cause local temperature to be too high. At the same time, this method also requires a high rate ratio between potassium hydroxide and anhydrous hydrogen fluoride gas, and the yield of the product has a certain limit. instability
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Embodiment 1
[0055] The preparation of embodiment 1 potassium hydrogen fluoride
[0056] see figure 1 , the inventor also provides a system for preparing potassium hydrogen fluoride, comprising an anhydrous hydrogen fluoride tank 1, a potassium hydroxide tank 2, an anhydrous organic solvent tank 3, a reaction kettle 4, a centrifuge 5, a mother liquor tank 6, a condensation device, and a thermometer 41 and a pH meter 42;
[0057] In this embodiment, the potassium hydroxide solid is mixed with the organic solvent in the potassium hydroxide tank, and the potassium hydroxide tank is externally connected with the potassium hydroxide solid tank 21 and the organic solvent tank 22, and the potassium hydroxide solid tank is filled with the potassium hydroxide solid , the organic solvent tank is used to hold methanol, ethanol, acetonitrile, dichloromethane or their mixture, dissolve potassium hydroxide in the organic solvent, and configure the potassium hydroxide solution. The structure of the pot...
Embodiment 2
[0076] The preparation of embodiment 2 potassium hydrogen fluoride finished products
[0077] The difference between embodiment 2 and embodiment 1 is that the organic solvent used in embodiment 2 is ethanol; the mass percentage of potassium hydroxide solution is 40%.
[0078] The solubility of anhydrous hydrofluoric acid in ethanol at 25°C is 50g, and the solubility of potassium hydrogen fluoride in ethanol is less than 0.1g. Finally, a total of 565 kg of white solid potassium hydrogen fluoride was obtained, with a purity of 99.4% and a yield of 99%.
Embodiment 3
[0079] The preparation of embodiment 3 potassium hydrogen fluoride finished products
[0080] The difference between embodiment 3 and embodiment 1 is that acetonitrile is used as the organic solvent in embodiment 3; the mass percentage of potassium hydroxide solution is 30%.
[0081] The solubility of anhydrous hydrofluoric acid in acetonitrile at 25°C is 48g. The solubility of the potassium hydrogen fluoride in methanol is less than 0.1g. Finally, 566 kg of white solid potassium hydrogen fluoride was obtained. The purity is 99.8%, and the yield is 99%.
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Abstract
The invention relates to a preparation method and system of potassium hydrogen fluoride. The system comprises an anhydrous hydrogen fluoride tank, a potassium hydroxide tank, an anhydrous organic solvent tank, a reaction kettle, a centrifuge, a mother liquor tank, a condensing device, a temperature meter and a pH meter. The method comprises the following steps: dissolving potassium hydroxide intoan organic solvent, and ensuring that anhydrous hydrogen fluoride and the potassium hydroxide are reacted with each other in the organic solvent to produce potassium hydrogen fluoride; ensuring that the solubility of the anhydrous hydrogen fluoride and the potassium hydroxide in the organic solvent is higher than that of the potassium hydrogen fluoride in the organic solvent. The potassium hydrogen fluoride formed through the method is small in powder granularity and high in purity, and the organic solvent can be reused during reaction.
Description
technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing potassium hydrogen fluoride and a preparation system thereof. Background technique [0002] There are currently two methods for the preparation of potassium hydrogen fluoride. One is prepared by the reaction of potassium carbonate and aqueous hydrogen fluoride; the other is prepared by potassium hydroxide and aqueous hydrogen fluoride. Both are potassium hydrogen fluoride with crystalline hydrate obtained by cooling and crystallizing hot supersaturated solution in aqueous solution. After centrifugation and drying, a flaky crystal product is obtained. [0003] The method for dry preparation of potassium hydrogen fluoride has strict requirements on equipment, and the equipment cost is relatively high. Potassium hydroxide reacts with anhydrous hydrogen fluoride gas to generate a large amount of heat, and excessive ventilation will cause local temperature to...
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