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Defluorination method of fluorine-containing hydrochloric acid

A technology of fluorine-containing hydrochloric acid and hydrochloric acid, which is applied in separation methods, chemical instruments and methods, halogen/halogen acid, etc., can solve the problems of inability to meet use requirements, affect the quality of hydrochloric acid, unavoidable, etc., and improve the efficiency of fluorine removal and regeneration. , The effect of good quality hydrochloric acid and convenient regeneration

Inactive Publication Date: 2018-04-10
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above methods will inevitably bring in some organic or inorganic substances and other chemical substances, which will affect the quality of the refined hydrochloric acid, and due to the limitation of the method, the fluorine content of the hydrochloric acid after defluoridation still cannot meet some use requirements, which will affect the use.

Method used

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  • Defluorination method of fluorine-containing hydrochloric acid
  • Defluorination method of fluorine-containing hydrochloric acid
  • Defluorination method of fluorine-containing hydrochloric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Weigh 200g of fluorine-containing hydrochloric acid (fluorine content 59.8ppm) into a fluoride bottle, add 1.0g of macroporous silica gel saturated with water absorption in the air, separate the silica gel after oscillating in a constant temperature oscillator at 30°C for 2 hours, and measure the fluorine content of the filtrate. The content is 15.5ppm. The separated silica gel was blotted dry with filter paper and put into a fluorinated bottle, then added 50.0 g of industrial water and oscillated in a constant temperature oscillator at 30°C for 1 hour to separate the silica gel. The fluorine content of the filtrate was determined to be 150.2 ppm.

Embodiment 2

[0032] Weigh 1.0g of macroporous silica gel saturated with water absorption in the air into a fluorinated bottle, add 20g of 2% NaOH aqueous solution, shake in a constant temperature oscillator at 30°C in a water bath for 1 hour, separate the silica gel, and then wash with deionized water to the center Dry it with filter paper and put it into a fluoride bottle, add 200g of fluorine-containing hydrochloric acid (fluorine content 59.8ppm) into the fluoride bottle, shake in a constant temperature oscillator at 30°C for 2 hours, separate the silica gel, and measure the fluorine content of the filtrate It is 7.2ppm. The separated silica gel was blotted dry with filter paper and put into a fluoride bottle, then added 50.0 g of deionized water and oscillated in a constant temperature oscillator at 30°C for 1 hour to separate the silica gel. The fluorine content of the filtrate was determined to be 183.3 ppm.

Embodiment 3

[0034] (1) Put 36 grams (50ml) of fine-pore silica gel with a particle size of 2-4mm in the air for 24 hours to absorb water until saturated, fill it into an adsorption column with an inner diameter of 15mm, and use a peristaltic pump to pump fluorine-containing hydrochloric acid (fluorine content 53.5ppm) Pour into the adsorption column from the top at a flow rate of 50ml / h, carry out adsorption defluorination at 25°C, collect the effluent wastewater from the bottom, and take samples to analyze the fluorine content. When the fluorine content of the effluent reaches about 3ppm, stop acid feeding, drain the hydrochloric acid in the adsorption column, collect the hydrochloric acid after defluorination, measure the fluorine and silicon content, and calculate the adsorption capacity.

[0035] (2) Next, regenerate with distilled water, use a peristaltic pump to pump 1500g of regenerant into the adsorption column from the top at a flow rate of 50ml / h, flow out from the bottom to coll...

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Abstract

The invention discloses a defluorination method of fluorine-containing hydrochloric acid. The method includes the following steps that 1, firstly, fluorine-containing hydrochloric acid is weighed andadded in a reaction device, silica gel is added into the reaction device so as to make the silica gel fully contact with fluorine-containing hydrochloric acid, the adsorption reaction occurs between hydrogen fluoride and silica gel in hydrochloric acid, and fluorinion is removed; 2, silica gel obtained after fluorine is adsorbed is subjected to water-bath shaking in a thermostatic oscillator for 1-2 h, the temperature of water bath is 20-30 DEG C, a regenerant is used for washing, the silica gel is treated to be neutral, after being adsorbed and dried by filter paper, the silica gel is placedin the reaction device, fluorine is separated out from the silica gel, the silica gel can be regenerated, and the silica gel obtained after regeneration is used for fluorine removal from hydrochloricacid in the next cycle. The method is simple in process, low in cost, convenient and safe to operate, high in fluoride removal efficiency, and suitable for defluoridation of low-fluorine hydrochloricacid.

Description

technical field [0001] The invention relates to a method for removing fluorine with fluorine-containing hydrochloric acid. Background technique [0002] A large amount of fluorine-containing hydrochloric acid containing hydrogen fluoride is 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 describes 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 regenerating a trialkylfluorosilane compound produced in the contact step. In thi...

Claims

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Application Information

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IPC IPC(8): C01B7/07B01D15/08B01D15/42
CPCB01D15/08B01D15/424C01B7/0718
Inventor 杨仲苗姜志田吴奕
Owner JUHUA GROUP TECH CENT
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