Method for purifying potassium iodide from perfluoroalkylethyl acrylate byproduct

A technology of perfluoroalkyl ethyl acrylate and potassium iodide, which is applied in chemical instruments and methods, purification of alkali metal halides, preparation of carboxylate, etc. It can solve the problem of large C-F bond energy, high environmental pressure, residual organic matter, etc. Problems, to achieve high added value, cost savings, avoid waste and pollution effects

Active Publication Date: 2019-07-12
SICHUAN XIAIFU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process not only consumes a lot of energy, but also produces a large amount of highly corrosive hydrofluoric acid. At the same time, due to the large C-F bond energy, there will be residual organic matter in the system, and even the highly toxic substance perfluoroisobutylene will be produced.
Therefore, the safety is poor, the pressure of environmental protection is high, the product quality is poor, and the cost is high

Method used

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  • Method for purifying potassium iodide from perfluoroalkylethyl acrylate byproduct
  • Method for purifying potassium iodide from perfluoroalkylethyl acrylate byproduct

Examples

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Embodiment 1

[0033] A method for purifying potassium iodide from the by-product of perfluoroalkyl ethyl acrylate, the method comprising the following steps:

[0034] (1) Washing:

[0035] Take 100 kilograms of by-products from the synthesis reaction of perfluoroalkyl ethyl acrylate, and add crude potassium iodide with 75% potassium iodide content to a 500-liter enamel stirred tank, then add 150 kilograms of absolute ethanol, turn on the stirring, and jacket heating steam. When the temperature in the kettle reaches 78°C, the system will reflux, and continue stirring for 1 hour under reflux;

[0036] (2) Centrifugal:

[0037] After refluxing for 1 hour, stop heating, and pass cooling water into the jacket to cool the crude potassium iodide solution in the enamel stirred tank. When the temperature of the materials in the enamel stirred tank drops to 60°C, put the materials in the centrifuge for centrifugal filtration. Obtain refined potassium iodide solid I and filtrate I;

[0038] (3) Drying:

[0039...

Embodiment 2

[0044] A method for purifying potassium iodide from the by-product of perfluoroalkyl ethyl acrylate, the method comprising the following steps:

[0045] (1) Washing:

[0046] Take 100 kilograms of by-products from the synthesis of perfluoroalkyl ethyl acrylate and add crude potassium iodide with 75% potassium iodide content to a 500-liter enamel stirred tank, then add 150 kilograms of absolute ethanol, turn on the stirring, and jacket heating steam. When the temperature in the kettle reached 78°C, the system refluxed, and stirring was continued for 1 hour under reflux.

[0047] (2) Centrifugal:

[0048] After refluxing for 1 hour, stop heating, and pass cooling water into the jacket to cool the crude potassium iodide solution in the enamel stirred tank. When the temperature of the material in the enamel stirred tank drops to 60°C, put the material in the centrifuge for centrifugal filtration. Obtain refined potassium iodide solid I and filtrate I;

[0049] (3) Re-washing and centrifug...

Embodiment 3

[0057] A method for purifying potassium iodide from the by-product of perfluoroalkyl ethyl acrylate, the method comprising the following steps:

[0058] (1) Washing:

[0059] Take 100 kilograms of by-products from the synthesis of perfluoroalkyl ethyl acrylate and add crude potassium iodide with 75% potassium iodide content to a 500-liter enamel stirred tank, then add 150 kilograms of absolute ethanol, turn on the stirring, and jacket heating steam. When the temperature in the kettle reached 78°C, the system refluxed, and stirring was continued for 1 hour under reflux.

[0060] (2) Centrifugal:

[0061] After refluxing for 1 hour, stop heating, and pass cooling water into the jacket to cool the crude potassium iodide solution in the enamel stirred tank. When the temperature of the material in the enamel stirred tank drops to 60°C, put the material in the centrifuge for centrifugal filtration. Obtain refined potassium iodide solid I and filtrate I;

[0062] (3) Re-washing and centrifug...

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PUM

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Abstract

The invention discloses a method for purifying potassium iodide from a perfluoroalkylethyl acrylate byproduct. The method comprises the following steps: washing, centrifugal filtration, and drying forobtaining the finished refined potassium iodide solid. The method for purifying potassium iodide has the advantages of simplicity in process operation, realization of the purity of the purified potassium iodide of 99%, no generation of three wastes in the whole process, safety ensuring and low energy consumption.

Description

Technical field [0001] The invention belongs to the technical field of potassium iodide purification, and particularly relates to a method for purifying potassium iodide from a by-product of perfluoroalkyl ethyl acrylate. Background technique [0002] Perfluoroalkyl ethyl acrylate and other products are important chemical raw materials, which can be transformed into various fluorine-containing intermediates such as corresponding alcohols, mercaptans and sulfonyl chlorides to further synthesize various fluorine-containing surfactants and fluorine-containing Finishing agents and other fluorine-containing fine chemicals. Such fluorine-containing products have excellent properties such as high heat resistance, high chemical stability, and water and oil repellency. The fluorine-containing fabric finishing agent made from it has the characteristics that traditional fabric finishing agents can’t match. Textiles have a variety of excellent properties, so they have attracted the attentio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/12C01D3/18C07C29/80C07C31/08C07C17/383C07C21/18C07C67/54C07C69/54
CPCC01D3/12C01D3/18C01P2006/80C07C17/383C07C29/80C07C67/54C07C31/08C07C21/18C07C69/54
Inventor 张金刚周廷廷李瑞涛腾岩王鸿飞万仁军王顺好杨建全
Owner SICHUAN XIAIFU TECH
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