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Method for treating perfluoro ammonium caprylate in waste water for PTFE dispersion resin production

A polytetrafluoroethylene and perfluorooctanoic acid technology, which is applied in water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of high concentration of ammonium perfluorooctanoate, no energy saving advantage, complicated process, etc. Achieve the effect of low cost, easy operation and simple process

Active Publication Date: 2008-09-24
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods generally require a high concentration of ammonium perfluorooctanoate in the recovered liquid, the process is complicated, the cost is high, and there is no energy-saving advantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add a total of 48360g mother liquor, 50g calcium chloride (CaCl 2 ), stirred for half an hour each time, stopped stirring, settled for half an hour, and separated the upper and lower layers. Dehydrate the sediment in the lower layer, dry it, and acidify it with industrial sulfuric acid (98% WT) to make pH = 5; finally, purify it by rectification under reduced pressure. After removing water, 4.8 g of perfluorooctanoic acid can be recovered. 96% purity.

Embodiment 2

[0025] Add a total of 42948g mother liquor, 45g magnesium chloride (MgCl 2 ), stirred for half an hour each time, stopped stirring, settled for half an hour, and separated the upper and lower layers. Dehydrate the sediment in the lower layer, dry it, and acidify it with industrial sulfuric acid (98% WT) to make pH = 5; finally, purify it by rectification under reduced pressure, and 4.5 g of perfluorooctanoic acid can be recovered. 96% purity.

Embodiment 3

[0027] In the coagulation kettle, add mother liquor in ten times and add up to 51878g, 60g zinc chloride (ZnCl 2 ), after stirring for half an hour each time, settling for one hour, and separating the upper and lower layers. Dehydrate the sediment in the lower layer, dry it, and acidify it with industrial sulfuric acid (98% WT) to make pH = 4; finally, purify it by rectification under reduced pressure. After removing water, 5.8 g of perfluorooctanoic acid can be recovered. 95% purity.

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PUM

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Abstract

The invention is a method of processing ammonium perfluoro octoate in the waste water of teflon dispersion resin production, belonging to the field of processing waste water of teflon dispersion resin production, adopting deposition process to process the waste water, using bivalent metal salts as precipitator and trivalent metal salts as flocculant, processing the waste water by different metallic ions and in different proportions, able to make the concentration of ammonium perfluoro octoate in the obtained clear solution is below 10mg / L, reaching the secondary pollutant effluent concentration (the primary standard 10mg / L ) and completely able to meet the effluent requirements. And the recovered ammonium perfluoro octoate has purity up to 95%, and can be reused in polymerization or act as other fluorine-containing organic matter intermediates.

Description

technical field [0001] The invention relates to a method for recovering ammonium perfluorooctanoate in polytetrafluoroethylene dispersed resin production wastewater, and belongs to the technical field of polytetrafluoroethylene production wastewater treatment. Background technique [0002] PTFE resin is known as the "King of Plastics" because of its excellent properties such as heat resistance, weather resistance, chemical corrosion resistance, low friction, and good electrical insulation resistance. It has been widely used in national Economic sphere. [0003] There are two methods for the production of polytetrafluoroethylene resin (PTFE), namely the suspension method and the dispersion method. The dispersion method is to carry out polymerization at the interface formed by the dispersant. During the polymerization process, a certain amount of ammonium perfluorooctanoate (APFOS) should be added as the dispersant. After the polymerization is completed, the resin will be for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C53/21C07C51/42C02F1/58
Inventor 张恒宋学章孙百开隋晓媛
Owner SHANDONG DONGYUE POLYMER MATERIAL
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