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Method for preparing high-purity boron trifluoride

A boron trifluoride, high-purity technology, applied in boron halide compounds and other directions, can solve the problems of ratio error affecting bonding quality, complicated process, etc., and achieve good utilization of cooling and heat, stable quality and low production cost. Effect

Inactive Publication Date: 2012-07-11
TIANJIN TAIHENG GASES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Proportion error during operation affects the bonding quality, and the process is cumbersome

Method used

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  • Method for preparing high-purity boron trifluoride
  • Method for preparing high-purity boron trifluoride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 300 grams of sodium fluoroboride and 50 grams of anhydrous boric anhydride are ground together, then the mixture is placed in a flask, 300 milliliters of concentrated sulfuric acid is added, and excess boron trifluoride is removed under reduced pressure at 130 ° C. made; see process for details figure 1 .

Embodiment 2

[0050] Grind 350 grams of sodium fluoroborate and 60 grams of anhydrous boric anhydride together, then put the mixture in a flask, add about 400 milliliters of concentrated sulfuric acid, and remove excess boron trifluoride under reduced pressure at 130°C made; see process for details figure 1 .

Embodiment 3

[0052] Such as figure 1 A method for preparing high-purity boron trifluoride is shown, including a flask, a standard conical interface, a water-cooled jacket, a piston, a washing bottle and an ampoule, the flask 1 is installed on the standard conical interface 2, and the standard conical interface A circulating water seal 8 is installed on the outside, and the circulating water seal is provided with a circulating water inlet 801 and a circulating water outlet 802, and the standard tapered interface is connected to the glass pipeline 7. A water-cooling jacket 3 is installed on the outside, and the water-cooling jacket is provided with a cold water inlet 301 And the outlet 302 of cold water, the piston 4 that is housed is connected with washing bottle 5, ampoule 6 respectively on the glass pipeline. Process for preparing high-purity boron trifluoride:

[0053] This method is based on the fluorite boric anhydride method, using cheap fluorosulfuric acid instead of expensive ...

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Abstract

The invention discloses a method for preparing high-purity boron trifluoride. The method comprises the following steps of: grinding sodium fluoborate and boron anhydrous together; putting the mixture into a flask, adding concentrated sulfuric acid, and shaking the flask to fully mixing the solid and the liquid uniformly; reducing pressure at 130DEG C to take out excessive boron trifluoride; distilling the boron trifluoride from one ampoule to another ampoule, discarding a front fraction and a rear fraction, and partially purifying the boron trifluoride. The preparation method is reasonable in process and simple in preparation, and is the most simple and ideal method for preparing the boron trifluoride.

Description

technical field [0001] The invention relates to a chemical product, in particular to a method for preparing high-purity boron trifluoride, which is suitable for producing boron trifluoride. Background technique [0002] Boron trifluoride is an important catalyst widely used in organic synthesis and petrochemical industry. It is used in many organic chemical reactions such as alkylation, polymerization, isomerization, addition, condensation and decomposition. The reason why it has such a wide range of application fields in catalytic reactions is that the boron electron layer structure has a strong tendency to form complexes, which is very important to produce catalytically active structures in the action of acidic catalysts. In many reactions, boron trifluoride-based catalysts are more active than metal halides of organic acids without causing undesired side reactions. As a catalyst, BF 3 It can be used in various forms, such as in a single gaseous state, or with many ty...

Claims

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Application Information

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IPC IPC(8): C01B35/06
Inventor 李中元
Owner TIANJIN TAIHENG GASES
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