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A kind of preparation method of vinyl bromide

A technology of vinyl fluoride and fluoroethane, which is applied in the field of preparation of fluoroethylene bromide compounds, can solve problems such as high bromination temperature, easy decomposition, and instability of fluoroethane, achieve low bromination temperature, improve utilization rate, reduce The effect of energy consumption

Active Publication Date: 2016-12-07
中化蓝天氟材料有限公司 +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first step bromination temperature of this method is too high, at this temperature, fluoroethane is unstable and easy to decompose, so the reaction yield is low

Method used

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  • A kind of preparation method of vinyl bromide
  • A kind of preparation method of vinyl bromide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～14

[0026] Embodiment 1~14 prepares 1,1-dibromo-1-fluoroethane

[0027] (1) First-stage thermal bromination reaction

[0028] Pass fluoroethane gas into liquid bromine at 52-58°C, and the resulting mixed gas continuously passes through the quartz reactor placed in the tubular heating furnace. By changing the reaction temperature and the molar ratio of raw materials, the outlet material of the quartz reactor is collected. After washing with water, washing with alkali and rectifying, 1-bromo-1-fluoroethane and 1,1-dibromo-1-fluoroethane were obtained respectively.

[0029] (2) The second-stage thermal bromination reaction is passed into liquid bromine at 52-58°C, and the mixed gas produced is continuously passed through the quartz reactor placed in the tubular heating furnace for secondary bromination, and the outlet material of the quartz reactor is collected. After washing with water, washing with alkali and rectifying, 1,1-dibromo-1-fluoroethane is obtained.

[0030] The test r...

Embodiment 15

[0032] Example 15 Preparation of 1-bromo-1-fluoroethylene

[0033] Add 84g of potassium hydroxide and 196g of water into a 500ml reaction bottle with a rectification device, raise the temperature to 70°C while stirring, add 220g of 1,1-dibromo-1-fluoroethane dropwise at a constant speed, and keep the temperature after the dropwise addition After 2-3 hours of reaction, 125.3 g of the product 1-bromo-1-fluoroethylene was collected during the reaction, and the yield was 94.2%.

Embodiment 16

[0034] Example 16 Preparation of 1-bromo-1-fluoroethylene

[0035] Add 93g of potassium hydroxide and 217g of water into a 500ml reaction bottle with a rectification device, heat up to 80°C under stirring, add 264g of 1,1-dibromo-1-fluoroethane dropwise at a constant speed, and keep the temperature after the dropwise addition After 2-3 hours of reaction, 148.1 g of the product 1-bromo-1-fluoroethylene was collected during the reaction, and the yield was 92.5%.

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Abstract

The invention discloses a preparation method of 1-bromo-1-fluoroethylene.The preparation method comprises: two-stage bromination reaction and hydrogen bromide removal reaction; and has the characteristics of easily-available raw materials, low temperature of hot bromination reactions, high reaction yield, low cost, green, and environment-friendliness.

Description

technical field [0001] The invention relates to a preparation method of bromofluoroethylene compound. Background technique [0002] 1-Bromo-1-fluoroethylene is an important intermediate of fluorine-containing compounds, which can be used as an intermediate of various fluorine-containing fine chemicals for the synthesis of fluorine-containing medicines; it is also a monomer of fluorine-containing polymers , can be used as a fluoropolymer monomer to improve the processing performance of fluoropolymers and produce special properties. [0003] For the preparation method of 1-bromo-1-fluoroethylene, following reports are arranged: [0004] In 1978, Kazuya Edamura of Japan invented a method to obtain 1-bromo-1-fluoroethylene by using vinyl fluoride as a raw material through a two-step reaction. The method is firstly a bromine addition reaction. 159.8g (1.0mol) bromine is put into the reactor, the reaction temperature is controlled at 0-5°C, and vinyl fluoride gas is continuously...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C21/18C07C17/25C07C19/14C07C17/10
Inventor 项文勤韩国庆徐卫国盛楠陈明炎肖恒侨
Owner 中化蓝天氟材料有限公司