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Method for preparing potassium fluoride in high activity

A technology of highly active potassium fluoride and potassium fluoride, applied in directions such as alkali metal fluorides, can solve problems such as the inability to prepare highly active potassium fluoride products

Inactive Publication Date: 2007-10-10
云南云天化国际化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Highly active potassium fluoride products cannot be prepared by direct crystallization

Method used

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  • Method for preparing potassium fluoride in high activity
  • Method for preparing potassium fluoride in high activity
  • Method for preparing potassium fluoride in high activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Dissolving 1000g of potassium hydroxide in 800g of water to obtain a potassium hydroxide solution, and introducing hydrogen fluoride gas into the potassium hydroxide solution, the rate of introduction of hydrogen fluoride gas is advisable to keep the reaction temperature at 40-70°C;

[0026] 2) When the pH value of the reaction solution reaches 7.1, stop feeding the hydrogen fluoride gas, and the neutralization reaction is completed;

[0027] 3) After the reaction solution was allowed to settle for 12 hours, the supernatant was taken;

[0028] 4) Cool the supernatant to 21°C, add 0.5g potassium fluoride inducer, and the potassium fluoride aqueous solution will crystallize in an instant;

[0029] 5) After suction filtration and washing with a saturated potassium fluoride aqueous solution, put the filter cake into a vacuum oven to dry for 4 hours to obtain highly active potassium fluoride.

Embodiment 2

[0031] In the case that other conditions are the same as in Example 1, washing is carried out with absolute ethanol during the suction filtration in step 5).

Embodiment 3

[0033] In the case that other conditions are the same as in Example 1, after the instant crystallization in step 4) is completed, a certain amount of absolute ethanol is added to the crystallized potassium fluoride aqueous solution and fully stirred before suction filtration.

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Abstract

This invention relates to a method for preparing a chemical product, i.e., high-activity KF. This invention adopts the traditional method for preparing KF, i.e., neutralization method or hydrolysis method, which comprises: (1) preparing KF aqueous solution by neutralization method or hydrolysis method; (2) controlling the ratio of the raw materials to control the end pH value of the reaction as well as the final concentration of the reaction solution; (3) precipitating the reaction solution, and taking the supernatant to obtain KF aqueous solution; (4) cooling KF aqueous solution, and adding inducer to obtain KF crystal; (5) vacuum-filtering the KF crystal, and drying the filter cake to obtain high-activity KF product. The method large reduces the energy consumption for preparing high-activity KF.

Description

technical field [0001] The invention relates to a preparation method of chemical products, in particular to a preparation method of highly active potassium fluoride. Background technique [0002] Potassium fluoride is one of the most commonly used fluorinating agents. It can be said that without potassium fluoride, there would be no flourishing fluorine chemical industry. Potassium fluoride is the most important period of reactivity as a fluorinating agent. As a fluorinating agent, especially in the production and application of fine chemicals, high-activity potassium fluoride has incomparable advantages over ordinary anhydrous potassium fluoride. [0003] At present, the most commonly used process for the production of high-activity potassium fluoride is: based on the traditional production process of potassium fluoride, advanced drying and crushing processes are adopted, especially suitable surfactants are selected, and then spray-dried to obtain Highly active product. A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02
Inventor 明大增李志祥程相桂杨跃华
Owner 云南云天化国际化工有限公司
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