Novel technology for recycling fluorinated surfactant in water

A technology of fluorocarbon surfactants and active agents, which is applied in the new process field of recycling fluorocarbon surfactants in water, can solve the problems of immature recovery of fluorocarbon surfactants and unusable engineering practice, etc., and achieve low energy consumption and simple process reliable effect

Active Publication Date: 2016-10-12
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the separation of this gel from water and the recovery of fluorocarbon surfactants are immature and cannot be used in engineering practice.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Recovering PFOA in Wastewater Using Modified Iron Tetroxide

[0025] Take 27.8g of ferrous sulfate heptahydrate and 39.9g of ferrous sulfate to prepare a 50mL solution, then add 200mL of ammonia solution (100mL of 28% ammonia water and 100mL of deionized water), and stir vigorously for 2h. Then transfer the mixture to a beaker, and place the beaker above the magnet, so that the magnetic ferroferric oxide quickly precipitates to the bottom of the beaker, pour off the water and impurities in the upper part, and use deionization to wash 2-3 times to obtain high-purity Fe3O4 nanoparticles. Disperse the iron ferric oxide nanoparticles into 20 mL ethanol and 80 mL ammonia water, and add 5 g tetraethyl orthosilicate to react for 2 h, then add 0.5 g aminopropyltrimethoxysilane, and then react the material for 1 h, and use a magnetic field to shake the material Recycle. Then take 2g of coated magnetic particles and add them to a mixed solution of 20mL of dichloromet...

Embodiment 2

[0026] Example 2: Utilizing modified magnetite powder to recover perfluorooctanoic acid in wastewater

[0027]Take 200g of commercially available high-purity magnetite powder with a particle size above 1000 mesh, add 50mL of 28% ammonia water, 100mL of ethanol and 400mL of deionized water, stir vigorously with mechanical stirring, and then add 20g of tetraethyl orthosilicate to iron powder Carry out modification, add 5g of triethoxypropylaminosilane after reacting for 2 hours, bring amino groups on the surface of the particles, then use a magnetic field to separate the material, then take 4 g of coated magnetite powder and add 20mL of dichloromethane and 2g of pyridine, and add 0.5g of polyethylene glycol 6000 whose terminal is substituted by chlorine, after 1 hour of reaction, add 0.5 perfluorooctanoyl chloride for 2 hours of reaction, and use the magnetic field to recover the magnetic material. Put the modified magnetic nanoparticles into wastewater containing 100ppm perfluo...

Embodiment 3

[0028] Example 3: Recovering perfluorohexanoic acid in wastewater by using modified iron ferric oxide

[0029] Take 27.8g of ferrous sulfate heptahydrate and 39.9g of ferrous sulfate to make a 50mL solution, then add 200mL of ammonia solution (100mL of 28% ammonia water and 100mL of deionized water), and stir vigorously for 2h. Then transfer the mixture to a beaker, and place the beaker above the magnet, so that the magnetic ferroferric oxide quickly precipitates to the bottom of the beaker, pour off the water and impurities in the upper part, and use deionization to wash 2-3 times to obtain high-purity Fe3O4 nanoparticles. Disperse the iron ferric oxide nanoparticles into 20 mL ethanol and 80 mL ammonia water, and add 5 g tetraethyl orthosilicate to react for 2 h, then add 0.5 g aminopropyltrimethoxysilane, and then react the material for 1 h, and use a magnetic field to shake the material Recycle. Then take 2g of coated magnetic particles and add them to a mixed solution o...

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Abstract

The invention relates to the technical field of water treatment, in particular to a novel technology for recycling a fluorinated surfactant in water. The technology comprises the steps that firstly, ferromagnetic particles are synthesized or selected, then, the surface of a magnetic material is coated with an inert material layer, and then, the surface of the magnetic material is coated with a large number of reaction species; then, polyethylene glycol and fluorocarbon with the tail end capable of reacting with the reaction species is added, and polyoxyethylene chains and fluorocarbon chains are linked to the surfaces of the particles; the particles with the surfaces covered with the polyoxyethylene chains and fluorocarbon chains are dispersed into raw water containing a fluorinated surfactant; when adsorption is saturated, a high magnetic field is utilized for extracting the particles from water, and therefore the fluorinated surfactant in water can be removed, and the treated clean water can be directly discharged. The novel technology has the advantages that the method is simple and reliable, energy consumption is low, the magnetic particles can be recycled, and the novel technology can be used for recycling fluorinated surfactant in fluorine-containing polymer production and treating wastewater of the fluorinated surfactant.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a new process for recovering fluorocarbon surfactants in water. Background technique [0002] The fluorocarbon chain of the fluorocarbon surfactant has strong hydrophobicity, and it can effectively reduce the surface tension of water under the condition of extremely low dosage. It is the most important special surfactant. At the same time, the hydrogen atoms in the carbon chain are replaced by fluorine atoms, which makes the fluorocarbon surfactant have strong chemical and thermal stability and unique oil repellency. It can be used in the environment where other surfactants are difficult to use, such as high temperature, strong acid, strong alkali and strong oxidative environment, or the use conditions of other surfactants with insufficient performance. For example, in the synthesis of fluorocarbon polymers by emulsion polymerization, fluorocarbon surfactants are not a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/32C02F1/28C02F1/48C02F101/36
CPCB01J20/02B01J20/103B01J20/26B01J20/261B01J20/28009B01J20/3219C02F1/288C02F1/488C02F2101/36
Inventor 邹伟李嘉颜杰陈炯杨虎杨益祥苏桂萍朱胜兰
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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