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A kind of method for improving the production capacity of device in the synthesis of bromine-containing fluoroalkane

A bromofluoroalkane and production capacity technology, which is applied in the field of improving device production capacity in the synthesis of bromine-containing fluoroalkane, can solve the problems of reduced reaction speed and reduced processing capacity of reaction devices, and achieve the effect of increased production capacity

Active Publication Date: 2017-11-21
ZHEJIANG JUHUA HANZHENG NEW MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the invention requires that the bromination reaction be completed in a gas phase reactor, especially the reaction rate decreases when the bromination reaction is close to the end, thus causing the problem that the processing capacity of the reaction device is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a quartz tube with an inner diameter of 27mm and a length of 400mm (volume 230ml), an external floodlight whose main wavelength is visible light is irradiated, and hexafluoropropylene and bromine vapor are introduced at a speed of 12s for the residence time of hexafluoropropylene. The molar ratio of bromine is 1.2:1, the temperature of the quartz tube is controlled at 100°C, the conversion rate of bromine at the outlet of the gas phase reactor is 97%, and the gas at the outlet of the gas phase reactor is condensed and sent to a liquid phase reactor with a volume of 11.5ml , the temperature of the reactor is controlled at 40° C., and the external floodlight is irradiated. After testing, the conversion rate of bromine at the outlet of the liquid phase reactor reaches 99.97%, and the selectivity of 1,2-dibromohexafluoropropane is 99.6%.

Embodiment 2

[0024] In a quartz tube with an inner diameter of 27mm and a length of 400mm (volume 230ml), an incandescent lamp is placed outside for irradiation, and tetrafluoroethylene and bromine steam are introduced at a rate of 18s for the residence time of tetrafluoroethylene, and the molar ratio of tetrafluoroethylene and bromine is 1.5:1 , the temperature of the quartz tube is controlled at 60°C, and the conversion rate of bromine at the outlet of the gas phase reactor is 96%. After the gas at the outlet of the gas phase reactor is condensed, it is sent into a liquid phase reactor with a volume of 35ml, and the temperature of the reactor is controlled at 30°C. Irradiated by an external incandescent lamp, it is detected that the conversion rate of bromine at the outlet of the liquid phase reactor reaches 99.98%, and the selectivity of 1,2-dibromohexafluoropropane is 99.7%.

Embodiment 3

[0029] In a quartz tube with an inner diameter of 27mm and a length of 400mm (volume 230ml), an external floodlight is placed, and hexafluoropropylene and bromine vapor are introduced at a rate of 5 seconds for the residence time of hexafluoropropylene. The molar ratio of hexafluoropropylene to bromine is 2:1, the temperature of the quartz tube is controlled at 120°C, the conversion rate of bromine at the outlet of the gas phase reactor is 95%, the gas at the outlet of the gas phase reactor is condensed and sent to a liquid phase reactor with a volume of 46ml, and the temperature of the reactor is controlled at 50°C, irradiated by an external floodlight, after testing, the conversion rate of bromine in the reaction liquid at the outlet of the liquid phase reactor reached 99.99%, and the selectivity of 1,2-dibromohexafluoropropane was 99.7%.

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Abstract

The invention discloses a method for increasing the production capacity of a device in bromine-containing hydrofluoroalkane synthesis. The method comprises the following steps: performing gas-phase bromination on hydrofluoroalkane to generate bromine-containing hydrofluoroalkane, condensing a reaction product into liquid, feeding the liquid into a liquid-phase reactor, and performing further reaction on residual bromine in the reaction product and excessive hydrofluoroalkane in the liquid-phase reactor to realize complete reaction of bromine. According to the method adopted by the invention, the bromine conversion rate can be more than 99.95%, the reaction liquid does not need to be debrominated, and the production capacity of the gas-phase reaction device is increased by 20%-40%.

Description

technical field [0001] The invention relates to a method for improving the production capacity of a device in the synthesis of bromine-containing fluoroalkanes, and the method also involves the removal of residual bromine in the gas-phase bromination reaction process of fluoroalkenes. Background technique [0002] Bromine-containing fluoroalkanes are an important class of fluorine-containing chemicals, which can be used as refrigerants, foaming agents, fire extinguishing agents, etc., and are also intermediates of medicines, pesticides, and surfactants. For example, 1,2-dibromohexafluoropropane can be used as a fire extinguishing agent to prepare organic synthesis building block 2-bromoheptafluoropropane, dibromotetrafluoroethane can be used as a fire extinguishing agent and foaming agent, and trifluoroacetic acid can be prepared after isomerization . [0003] The synthesis method of bromine-containing fluoroalkane 1,2-dibromotetrafluoroethane and 1,2-dibromohexafluoropropa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C19/14C07C17/04
Inventor 叶立峰周强
Owner ZHEJIANG JUHUA HANZHENG NEW MATERIAL
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