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Method for preparing boron trifluoride

A technology of boron trifluoride and hydrogen fluoride, which is applied in the direction of boron halide compounds, etc., can solve the problems of cumbersome process and proportion error affecting the bonding quality, etc., achieve good use of cold and heat, solve the problem of unstable production, and low production cost Effect

Inactive Publication Date: 2012-05-02
TIANJIN TAIHENG GASES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 boron trifluoride
  • Method for preparing boron trifluoride
  • Method for preparing boron trifluoride

Examples

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Effect test

Embodiment 1

[0051] Boron trifluoride is prepared by continuously reacting a mixture of 400 liters / hour of boric acid and 1000 liters / hour of sulfuric acid with 100 liters / hour of hydrogen fluoride at a temperature of 700-800°C under the dehydration effect of continuous addition of 1000 liters / hour of fuming sulfuric acid. , where the volume ratio of boric acid and sulfuric acid is 1:10 to prepare boron trifluoride.

[0052] according to figure 1 The description writes out the process of preparation:

[0053] figure 1 A device for preparing boron trifluoride by reacting a mixture of boric acid and sulfuric acid with hydrogen fluoride is shown, including a separation tower, a mixer and a reaction tower. The separation tower is respectively provided with an inlet 101 of the separation tower, an outlet 102 of the separation tower, a separation The outlet two 103 of the tower, the outlet three 104 of the separation tower, the outlet two of the separation tower is connected to the inl...

Embodiment 2

[0055] Under the dehydration effect of 1200 liters / hour of fuming sulfuric acid added continuously, at 800 ℃ temperature, the mixture of 500 liters / hour boric acid and 1200 liters / hour sulfuric acid is reacted with 120 liters / hour hydrogen fluoride continuously to prepare boron trifluoride, wherein The volume ratio of boric acid and sulfuric acid is 1:10 to prepare boron trifluoride.

[0056] figure 1 A device for preparing boron trifluoride by reacting a mixture of boric acid and sulfuric acid with hydrogen fluoride as shown includes a separation tower, a mixer and a reaction tower. The separation tower is respectively provided with an inlet 101 of the separation tower, an outlet 102 of the separation tower, a separation tower The outlet two 103 of the tower, the outlet three 104 of the separation tower, the outlet two of the separation tower is connected to the inlet one 301 of the reaction tower by the pipeline, the outlet three of the separation tower is connected to ...

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Abstract

The invention discloses a method for preparing boron trifluoride by reacting a mixture of boric acid and sulfuric acid with hydrogen fluoride. The method comprises the following step of: reacting the mixture of 400 to 500 liter / hour of boric acid and 1,000 to 1,200 liter / hour of sulfuric acid with 100 to 120 liter / hour of hydrogen fluoride at the temperature of between 700 and 800 DEG C under the dehydration action of 1,000 to 1,200 liter / hour of fuming sulfuric acid to obtain a boron trifluoride crystal. The preparation method has a reasonable process, makes the boron trifluoride prepared easily and is the simplest ideal technology for preparing the boron trifluoride.

Description

technical field [0001] The invention relates to a chemical product, in particular to a technology for preparing boron trifluoride by reacting a mixture of boric acid and sulfuric acid with hydrogen fluoride, which is suitable for large-scale industrial production of 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 cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/06
Inventor 李中元
Owner TIANJIN TAIHENG GASES
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