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Method and device for recovering boron trifluoride in wastewater containing boron trifluoride

A boron trifluoride and recovery method technology, applied in boron halide compounds, chemical instruments and methods, organic chemistry, etc., can solve problems such as toxicity, damage to sewage treatment systems, and no degradation and conversion of fluorine and boron, so as to reduce the impact, The effect of reducing waste

Pending Publication Date: 2021-05-28
SHANDONG HEYI GAS CO LTD DONGYING CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing sewage treatment system has no degradation and conversion effect on boron fluoride; moreover, the presence of boron fluorine compounds in wastewater is extremely toxic to biochemical bacteria in traditional sewage treatment, and a little carelessness will cause damage to the sewage treatment system
At present, there is no method for recovering boron trifluoride in wastewater

Method used

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  • Method and device for recovering boron trifluoride in wastewater containing boron trifluoride
  • Method and device for recovering boron trifluoride in wastewater containing boron trifluoride
  • Method and device for recovering boron trifluoride in wastewater containing boron trifluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] 100kg of waste water containing boron trifluoride (waste water produced in the process of preparing cefazolin) and 8.2kg of sodium hydroxide are dropped into the neutralization reaction tank 1 through the second inlet 1-7, and the agitator 1-5 is opened to carry out the acid reaction. Alkali neutralization reaction for 30min;

[0072] Inlet steam into the heating pipe inlet 1-3 provided on the outer surface of the neutralization reaction tank 1 to make the temperature of the feed liquid in the neutralization reaction tank 1 reach 80°C, close the first inlet 1-6, the second inlet 1-7 and The second outlet 1-9 feeds cooling circulating water into the cooling pipe inlet 4-1 on the outer surface of the condenser 4, opens the vacuum pump 6, and makes the vacuum degree in the neutralization reaction tank be-0.09MPa; carry out vacuum distillation, Stop the vacuum distillation when the quality of water removed from the feed liquid in the neutralization reaction tank 1 accounts ...

Embodiment 2

[0078] Recover boron trifluoride containing boron trifluoride waste water according to the method of embodiment 1, difference is, the mass ratio of boron trifluoride gas and acetonitrile is 1:6.8; The temperature of cooling crystallization is 25 ℃; Replacement reaction The temperature is 140°C.

Embodiment 3

[0080] Recover boron trifluoride containing boron trifluoride waste water according to the method of embodiment 1, the difference is that the mass ratio of boron trifluoride gas and acetonitrile is 1:6.2; the temperature of cooling crystallization is 20 ℃; replacement reaction The temperature is 160°C.

[0081] Weigh the sodium fluoroborate and boric acid total mass that embodiment 1~3 prepares, and its result is listed in table 1; Calculation embodiment 1~3 obtains the yield of sodium fluoroborate and boric acid, and its result is listed in table 1 Detect the water content of sodium fluoroborate and boric acid that embodiment 1~3 obtains according to Karl Fischer moisture detection method, its result is listed in table 1; According to GB / T22667-2008 and GB / T538-2006 detect embodiment 1~ 3 The mass percentages of sodium fluoroborate and boric acid in sodium fluoroborate and boric acid obtained, the results are listed in Table 1.

[0082] Weigh the quality of the boron trifluo...

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Abstract

The invention belongs to the technical field of wastewater treatment, and particularly relates to a method and device for recovering boron trifluoride in wastewater containing boron trifluoride. The recovery method provided by the invention comprises the following steps: mixing wastewater containing boron trifluoride with strong base to carry out acid-base neutralization reaction to obtain a neutralization reaction product, wherein the boron trifluoride contained in the wastewater is hydrolyzed into fluoboric acid and boric acid; and mixing the neutralization reaction product with fuming sulfuric acid, and carrying out a replacement reaction to obtain boron trifluoride gas. According to the method, by adding the strong base into the boron trifluoride-containing wastewater and carrying out acid-base neutralization reaction on the strong base and fluoboric acid in the wastewater, sodium fluoborate is obtained; and sodium fluoborate, boric acid and fuming sulfuric acid react to obtain the boron trifluoride gas. According to the method, boron trifluoride in the wastewater is recycled by utilizing a simple chemical reaction. The recovery method provided by the invention is simple and easy to implement; the influence of boron trifluoride on the environment and an existing wastewater treatment system is reduced; and the waste of resources is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a method for recovering boron trifluoride in waste water containing boron trifluoride and a recovery device thereof. Background technique [0002] At present, there are more and more products using boron trifluoride as a polymerization and condensation catalyst in chemical production. The amount of boron showed a sharp increase trend. With the wide application of boron trifluoride, the waste water produced after chemical reaction contains higher concentration of boron fluoride compounds. Because fluorine and boron compounds will pollute the environment, the state strictly limits the content of fluorine and boron in wastewater, and some local standards require that the content of fluoride ions in wastewater should be below 30ppm. [0003] The existing sewage treatment system has no degradation and conversion effect on boron fluoride; moreover, the prese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/06C07F5/02
CPCC01B35/061C07F5/022
Inventor 杨军
Owner SHANDONG HEYI GAS CO LTD DONGYING CITY
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