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Method for co-production of propylene glycol during production of boron trifluoride

A boron trifluoride and propylene glycol technology, which is applied in the field of producing boron trifluoride gas to co-produce propylene glycol, can solve the problems of high impurity content of boron trifluoride gas, large environmental pollution, equipment corrosion, etc., and achieves improved utilization rate of by-products , The effect of reducing production cost and improving purity

Active Publication Date: 2015-02-18
SHANDONG HEYI GAS CO LTD DONGYING CITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The disadvantage of the above method is that the boron trifluoride gas has high impurity content, low purity, solid residues that are difficult to remove remain in the reactor, large amount of sulfuric acid, serious corrosion of equipment, sulfuric acid residues in the reaction, difficult to handle, and environmental pollution. very big

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) 0.8mol boric acid and 0.1mol water are dropped into reaction vessel, stir, fully mix;

[0033] (2) Add 1mol hydrofluoric acid to the mixture obtained in step (1), and stir until the mixture is completely converted into liquid;

[0034] (3) Slowly drip 0.8mol propylene oxide into the liquid obtained in step (2), and propylene oxide undergoes a hydrolysis reaction in the presence of boron trifluoride, and ring-opening generates propylene glycol, while obtaining boron trifluoride, boron trifluoride The yield is 95%.

[0035] (4) Use a purifier to purify the prepared boron trifluoride gas, adjust the temperature of the boron trifluoride gas to 25°C to 80°C, and the pressure to 0.02Mpa to 15Mpa, then fill the boron trifluoride in the steel cylinder, three The purity of boron fluoride is 99.98%.

[0036] (5) The remaining material in the reaction vessel is crude propylene glycol with a purity of 95%. The propylene glycol is rectified to obtain a finished product of prop...

Embodiment 2

[0038] (1) 0.8mol boric acid and 0.5mol water are dropped into reaction vessel, stir, fully mix;

[0039] (2) Add 0.53mol hydrofluoric acid to the mixture obtained in step (1), and stir until the mixture is completely converted into liquid;

[0040] (3) Slowly drip 1.4mol propylene oxide into the liquid obtained in step (2), the propylene oxide undergoes a hydrolysis reaction in the presence of boron trifluoride, ring-opening generates propylene glycol, and simultaneously obtains boron trifluoride, boron trifluoride The yield is 98.5%.

[0041] (4) Use a purifier to purify the prepared boron trifluoride gas, adjust the temperature of the boron trifluoride gas to 25°C to 80°C, and the pressure to 0.02Mpa to 15Mpa, then fill the boron trifluoride in the steel cylinder, three The purity of boron fluoride is 99.95%.

[0042] (5) The remaining material in the reaction vessel is crude propylene glycol with a purity of 97.5%. The propylene glycol is rectified to obtain a finished p...

Embodiment 3

[0044] (1) 1.5mol boric acid and 0.1mol water are dropped into reaction vessel, stir, fully mix;

[0045] (2) Add 0.63mol hydrofluoric acid to the mixture obtained in step (1), and stir until the mixture is completely converted into liquid;

[0046](3) Slowly drip 0.8mol propylene oxide into the liquid obtained in step (2), and propylene oxide undergoes a hydrolysis reaction in the presence of boron trifluoride, and ring-opening generates propylene glycol, while obtaining boron trifluoride, boron trifluoride The yield is 96%.

[0047] (4) Use a purifier to purify the prepared boron trifluoride gas, adjust the temperature of the boron trifluoride gas to 25°C to 80°C, and the pressure to 0.02Mpa to 15Mpa, then fill the boron trifluoride in the steel cylinder, three The purity of boron fluoride is 99.95%.

[0048] (5) The remaining material in the reaction vessel is crude propylene glycol with a purity of 96.5%. The propylene glycol is rectified to obtain a finished product of ...

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Abstract

The invention discloses a method for the co-production of propylene glycol during the production of boron trifluoride. Boric acid, hydrofluoric acid, water and propylene oxide are used as raw materials, and the method comprises the following steps of hydrolyzing the propylene oxide in the presence of boron trifluoride, performing ring opening reaction on the propylene oxide to generate propylene glycol, and preparing boron trifluoride at the same time. According to the method, the adoption of sulfuric acid as a reaction raw material is avoided, so that corrosion to production equipment is reduced, and the environmental pollution is avoided; the prepared boron trifluoride does not contain impurities such as HF, SO3 and SO2, so that the purity of the boron trifluoride is obviously improved; the problem of existence of waste sulfuric acid difficult to treat in a byproduct produced by the production of boron trifluoride is solved, and the technical problem of serious corrosion to the production equipment is solved; propylene glycol is co-produced during the production of the boron trifluoride, and can be used for production after being rectified, so that the production cost is greatly lowered, and the utilization rate of the byproduct is increased.

Description

technical field [0001] The invention discloses a method for producing boron trifluoride gas and co-producing propylene glycol. Background technique [0002] High-purity 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 halides of inorganic acid metals without causing undesired side reactions. As a catalyst, boron trifluoride can be used in various forms, such as in the gaseous state alone, or in combination with many types of inorganic and organi...

Claims

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Application Information

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IPC IPC(8): C01B35/06C07C31/20C07C29/10
Inventor 刘喜民于景东张斌周士蒿张桂新
Owner SHANDONG HEYI GAS CO LTD DONGYING CITY
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