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Abatement of fluoroether carboxylic acids or salts employed in fluoropolymer resin manufacture

A technology of fluoroether carboxylic acid and polymer, applied in the field of removal of fluoroether carboxylic acid or salt used in the preparation of fluoropolymer resin, can solve the problem of expensive, recycled and reused linear fluoroether surfactant Complicated issues

Inactive Publication Date: 2011-04-13
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, recovery of linear fluoroether surfactants from this solution for reuse as disclosed in US2007 / 0015937A1 is complex and expensive

Method used

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  • Abatement of fluoroether carboxylic acids or salts employed in fluoropolymer resin manufacture
  • Abatement of fluoroether carboxylic acids or salts employed in fluoropolymer resin manufacture
  • Abatement of fluoroether carboxylic acids or salts employed in fluoropolymer resin manufacture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0103] Illustrate the method of the present invention with the polytetrafluoroethylene (PTFE) homopolymer polymerization reaction that uses branched chain fluoroether mixture, use having formula CF 3 CF 2 CF 2 OCF (CF 3 ) COOH(DA) structure as a perfluoromonoether carboxylic acid, and a mixture of perfluoropolyether carboxylic acids described above and identified in Table 2A below was used as PFPEA.

[0104] To a water-jacketed, paddle-stirred, cylindrical stainless steel reactor with a length-to-diameter ratio of approximately 1.5 and a water holding capacity of 10 gallons (37.9 L) placed horizontally, 40.6 lbs (18.4 kg) of demineralized Water, 600g paraffin, 0.05g ethoxylated alcohol 23-1, 4.3 g of succinic acid, and 15 mL of 0.02 m / v% oxalic acid in water. While stirring at a rate of 46 rpm, the reactor contents were heated to 65°C, and the reactor was evacuated and purged three times with tetrafluoroethylene (TFE). An aqueous mixture consisting of polymerizer mixture...

Embodiment 2

[0113] 300 g of wet PTFE resin was prepared and dried as in Example 1, except that during drying the waste stream leaving the 0.5 liter glass vessel was first passed into the NaOH scrubbing solution. After leaving the scrubbing solution, the exhaust gas stream is passed through a condenser to remove excess water, then passed through a heat exchanger to raise its temperature to about 60°C (this results in a relative humidity of about 50%) before entering the Activated carbon cartridge.

[0114] Based on the weight of the fluoroether by-product recovered from the cartridge, compared to the determination of all fluoroether carboxylic acids or salts present in the scrubbing solution, about 76% of the branched chain fluoroether carboxylic acid was present in the method used in this example Or the salt is decarboxylated and trapped. It is believed that less of the fluoroether carboxylic acid or salt was decarboxylated in this example than in Example 1 because the scrubber traps alm...

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Abstract

A process for making fluoropolymer resin comprising polymerizing at least one fluorinated monomer in an aqueous medium containing initiator and polymerization agent comprising fluoroether carboxylic acid or salt thereof to form an aqueous dispersion of particles of fluoropolymer. The fluoroether carboxylic acid or salt thereof employed in the process has the formula:(I) [R1-O-L-COO-] Y+ wherein R1 is a linear, branched or cyclic partially or fully fluorinated aliphatic group which may contain ether linkages; L is a branched partially or fully fluorinated alkylene group which may contain ether linkages; and Y+ is hydrogen, ammonium or alkali metal cation. Wet fluoropolymer resin is isolated from the aqueous medium. The wet fluoropolymer resin is to produce a dry fluoropolymer resin and to decarboxylate the residual fluoroether carboxylic acid or salt to produce a vapor of fluoroether byproduct. The vapor of fluoroether byproduct is captured.

Description

field of invention [0001] The present invention relates to a process for the preparation of fluoropolymer resins by dispersion polymerization of fluorinated monomers in an aqueous medium in the presence of fluoroether carboxylic acids or salts, said process comprising removal of fluoroether carboxylic acids or salts. Background of the invention [0002] A typical process for aqueous dispersion polymerization of fluorinated monomer involves feeding the fluorinated monomer into a thermal reactor containing a fluorosurfactant and deionized water. Paraffin wax is used in the reactor as a stabilizer for certain polymerization reactions, such as polytetrafluoroethylene (PTFE) homopolymer. A free radical initiator solution is used and additional fluorinated monomer is added to maintain pressure as the polymerization proceeds. Chain transfer agents are used in the polymerization of certain polymers, such as melt-processible TFE copolymers, to adjust melt viscosity. After several h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F6/16C08F14/18C08K5/06C08K5/095C08F2/16C11D1/00C09K23/42
CPCC08F214/18C08F6/16C08F14/18C08L27/12C08F2/16C07C41/18C07C41/36C08F114/26
Inventor P·D·布罗特尔斯L·H·梁S·V·甘加尔
Owner EI DU PONT DE NEMOURS & CO
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