Method for defluorinating fluorine-containing hydrochloric acid

A fluorine-containing hydrochloric acid and defluorination technology, which is applied in chemical instruments and methods, halogen/halogen acid, chlorine/hydrogen chloride purification, etc., can solve the problems of bringing in metal ions, long defluorination time, and low defluorination rate. Achieve the effects of large operating flexibility, high defluorination efficiency, and reduced production costs

Inactive Publication Date: 2017-06-23
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that this method needs to chlorinate the intermediate product in the regeneration process to generate trialkylchlorosilane for reuse, and the process is complicated
The disadvantage is that this method has the defect of long defluorination time
The disadvantage is that this method will bring in metal ions
The disadvantage is that this method brings in nearly 1% soluble matter, and the defluorination rate is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Weigh 300 g of fluorine-containing hydrochloric acid (hydrogen chloride mass percentage concentration is 16%, fluorine ion mass percentage concentration is 0.198%) and add it to a 500ml flask, add boric acid and potassium chloride 0.75g and 0.90g respectively, and stir the reaction at 30°C After 60 minutes, the reaction solution was distilled at atmospheric pressure to obtain the bottom liquid and 280 g of defluorinated hydrochloric acid, and the fluoride ion content in the defluorinated hydrochloric acid was determined to be 56 ppm.

Embodiment 2

[0036] Weigh 300 g of fluorine-containing hydrochloric acid (hydrogen chloride mass percentage concentration 16%, fluoride ion mass percentage concentration 0.198%) and add it to a 500ml flask, add boric acid and potassium chloride 5.0 g and 3.0 g respectively, stir and reflux at 100°C After 30 minutes, the reaction solution was subjected to atmospheric distillation to obtain the bottom liquid and 282 g of defluorinated hydrochloric acid, and the fluoride ion content in the defluorinated hydrochloric acid was determined to be 57 ppm.

Embodiment 3

[0038] Weigh 300 g of fluorine-containing hydrochloric acid (hydrogen chloride mass percent concentration 16%, fluoride ion mass percent concentration 0.198%) and add it to a 500ml flask, add boric acid and potassium chloride 2.5g and 6.0g respectively, and stir and react at 40°C for 120min , The reaction solution was distilled at atmospheric pressure to obtain the bottom liquid and 282g defluorinated hydrochloric acid, and the fluoride ion content in the defluorinated hydrochloric acid was measured to be 57ppm.

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Abstract

The invention discloses a method for defluorination of fluorine-containing hydrochloric acid. A soluble inorganic boron-containing compound and a soluble inorganic potassium-containing compound are added as defluorination agents to fluorine-containing hydrochloric acid for reaction, and the obtained reaction solution is distilled to obtain defluorination hydrochloric acid products. The invention has the advantages of simple process, high operating flexibility, high defluorination efficiency, and environmental protection.

Description

technical field [0001] The invention relates to a treatment method of fluorine-containing hydrochloric acid, in particular to a method for defluorination of fluorine-containing hydrochloric acid. Background technique [0002] A large amount of fluorine-containing hydrochloric acid containing hydrogen fluoride will be produced in the production process of fluorine chemical industry. Due to the existence of hydrofluoric acid, the application value of hydrochloric acid is greatly reduced, and it is easy to cause environmental protection problems and cause potential harm to the environment. Some enterprises even treat it as waste acid, which seriously affects economic benefits. Therefore need to seek the method for effectively removing hydrogen fluoride in hydrochloric acid. [0003] Patent US5122356 discloses a purification method of hydrochloric acid, which includes: a step of contacting a silane compound with hydrochloric acid containing hydrogen fluoride; and a step of rege...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07
CPCC01B7/0712
Inventor 杨仲苗吴奕姜志田
Owner JUHUA GROUP TECH CENT
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