Process for removing fluorinated compounds from an aqueous phase originating from the preparation of fluoropolymers

A fluorinated compound, a technology in water phase, applied in the field of partially fluorinated polymers, can solve problems such as reducing the efficiency of anion exchange technology, and achieve the effect of high removal efficiency

Inactive Publication Date: 2010-03-31
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These oligomers tend to bind weaker to anion exchange resins than perfluoroemulsifiers and are easily displaced by competing salt anions, reducing the efficiency of the anion exchange technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0150] Example 1: Removal of APFO by precipitation

[0151] 1.2 ml of an aqueous solution of Lupasol P (BASF) (0.1% by weight) was added with gentle stirring to 100 ml of an APFO solution (containing 95 ppm APFO) at a pH of about 7, resulting in 101.2 ml of an aqueous phase in which a precipitate formed. The precipitate was removed by filtering through a filter device (0.2 μm in pore size) for 30 minutes. The APFO concentration in the filtrate was 16 ppm; the APFO removal efficiency was about 83%.

example 2

[0152] Example 2: Removal of APFO by precipitation

[0153] The different amounts of flocculants shown in the table below were added to 100 ml of APFO solution (containing the amount of APFP shown in the table below) with a pH value of about 7 under gentle stirring. The resulting precipitate was removed from the aqueous phase after 30 minutes of filtration through a filter device (pore size 0.2 μm). APFO content and APFO efficiency are also shown in the table below.

[0154] APFO starting concentration

example 3

[0155] Example 3: Recycling APFO

[0156] 6 kg of an aqueous solution containing 0.35 wt % APFO was treated with 30 g of an aqueous solution containing 20.0 wt % PDADMAC. 17 g APFO was removed by precipitation. Add the precipitate to 200 ml MeOH, 100 ml water and 10 ml conc. 2 SO 4 in a mixture; the entire reaction mixture was worked up under reflux and after 2 hours the resulting ester was removed by distillation. 16.5 g of methyl perfluorooctanoate were recovered. The methyl ester was converted to the ammonium salt by addition of ammonia and simultaneous water / methanol distillation.

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Abstract

A process of removing fluorinated compounds from an aqueous phase originating from the preparation of fluoropolymers said process comprising the use of polycationic polymers.

Description

technical field [0001] The present invention relates to a process for the removal of fluorinated compounds, especially partially fluorinated polymers such as elastomers, from aqueous phases, preferably waste water. Background technique [0002] Fluoropolymers are polymers with a fluorinated backbone that have long been known and used in a variety of applications due to their desirable properties such as heat resistance, chemical resistance, weather resistance, UV stability, etc. . A variety of fluoropolymers are described, for example, in "Modern Fluoropolymers" (ed. John Scheirs, Wiley Science 1997). Fluoropolymers may have a partially fluorinated backbone, typically at least 40% by weight fluorinated or fully fluorinated backbone. Specific examples of fluoropolymers include polytetrafluoroethylene (PTFE), copolymers of tetrafluoroethylene (TFE) and hexafluoropropylene (HFP) (so-called FEP polymers), perfluoroalkoxy-containing copolymers containing Fluoropolymers (so-cal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/237C08F214/18C01B25/16C08F14/18C08F8/00
CPCC08F6/22C08F6/16C08F114/18C08F14/18C08F214/18C08L27/12C08F2/10
Inventor 克劳斯·欣策迈克尔·尤尔根斯安德烈亚斯·R·毛雷尔沃尔那·施韦特费格蒂尔曼·C·齐普莱斯凯·H·洛哈斯哈拉尔德·卡斯帕
Owner 3M INNOVATIVE PROPERTIES CO
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