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Method for recovering fluorinated emulsifiers from aqueous phases

A technology in emulsifier and water phase, which is applied in the field of wastewater treatment and can solve problems such as blockage of exchange towers

Inactive Publication Date: 2004-04-14
德弘两合有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The latex particles are anion-stabilized and thus coagulate within the anion-exchange resin, thereby causing blockage of the exchange column (column)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Process waste water (polymerization mother liquor) to be treated comes from the polymerization process of tetrafluoroethylene, hexafluoroethylene and vinylidene fluoride terpolymer, wherein polymer latex particles account for 0.3% by weight, and perfluorooctanoic acid accounts for 0.1% by weight. p-Octylphenol-ethoxylate commercially available under the trade name TRITON X 100 (Rohm & Haas, CAS-Nr. 9002-93-1) was used.

[0030] Concentration of TRITON® (ppm)

[0031] The concentration of PFOA near breakthrough shows a "run-out" at higher concentrations of nonionic surfactant. At higher concentrations of nonionic surfactants, the ion exchange capacity tends to decrease.

Embodiment 2

[0033] The example was repeated except that commercially available fatty alcohol polyglycol ether(R) GENAPOL X 080 (Hoechst AG) was used as the nonionic surfactant.

[0034] Concentration of GENAPOL (ppm)

Embodiment 3

[0036] The steps of Example 2 were repeated, but the treated process wastewater (polymerization mother liquor) was from the polymerization process of a copolymer of tetrafluoroethylene and perfluoro(n-propyl-ethyl) ether. This wastewater contained 0.1% by weight of PFOA and 0.4% by weight of polymer latex particles.

[0037] Concentration of GENAPOL (ppm)

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Abstract

The invention relates to a method for recovering fluorinated emulsifiers from an aqueous phase containing small quantities of fluoro-polymer particles. According to the inventive method, the aqueous phase is treated with a small quantity of a non-ionic surface-active agent, the treated aqueous phase is brought into contact with an anionic exchanger resin, and the adsorbed emulsifier is separated from the exchanger resin. The fine particle fluoro polymer can be quantitatively precipitated in the untreated aqueous phase or the eluate using flocculant.

Description

technical field [0001] The invention relates to a wastewater treatment method, mainly a treatment method for slightly polluted wastewater containing a fluorinated emulsifier. Since fluorinated monomers are not telogenic, fluorinated emulsifiers are used in the polymerization of fluorinated monomers. Preference is given to using salts of perfluorinated or partially fluorinated alkylcarboxylic acids or alkylsulfonic acids, preferably alkali metal or ammonium salts. These compounds are produced by electrofluorination or telomerization of perfluorinated monomers and are thus costly. Therefore, there is still a lack of experiments on the recovery of such valuable substances from wastewater. Background technique [0002] US-A-5 442 097 describes a process for recovering fluorinated carboxylic acids in a feasible manner from contaminated raw materials. In this method, the fluorinated carboxylic acid is liberated, if necessary, from a feedstock in an aqueous medium with an acid o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D15/04B01D17/12B01J41/04C02F1/42C02F1/54C02F101/36C07C51/47C07C53/21
CPCC07C51/47C02F1/42B01J41/04C02F1/547C07C53/18
Inventor G·伯卡德K·欣策G·洛尔
Owner 德弘两合有限公司