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Method for recovering and treating perfluoro ammonium caprylate for PTFE resin production by dispersion method

A technology of polytetrafluoroethylene and ammonium perfluorooctanoate, which is applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems that the oven tail gas treatment method has not been reported, and achieve high economy and Environmental benefits, simple process flow, and easy operation and control

Active Publication Date: 2007-03-28
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, manufacturers that produce PTFE are all dried in a circulating oven, but there is no report on the treatment method for the exhaust gas of the oven.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: the recovery processing method of ammonium perfluorooctanoate in the production of dispersion method polytetrafluoroethylene resin, the steps are as follows:

[0024] (1) In the production of polytetrafluoroethylene resin by the dispersion method, the mixed gas discharged by the dehumidification fan contains water vapor and ammonium perfluorooctanoate, and the mixed gas is passed into the absorption tank with a heat exchanger, and the lye in the absorption tank It is a 30% WT NaOH aqueous solution. The water vapor is condensed into water through the heat exchanger in the absorption tank, and the ammonium perfluorooctanoate is absorbed by the lye in the absorption tank. During the whole absorption process, adjust the pH value at 14 with lye. During the absorption process, use a stirrer to break up a large number of air bubbles generated.

[0025] (2) When the liquid level in the absorption tank reaches a certain height, the liquid is concentrated until the...

Embodiment 2

[0029] Embodiment 2: the recovery processing method of ammonium perfluorooctanoate in the production of dispersion method polytetrafluoroethylene resin, the steps are as follows:

[0030] (1) In the production of polytetrafluoroethylene resin by the dispersion method, the mixed gas discharged by the dehumidification fan contains water vapor and ammonium perfluorooctanoate, and the mixed gas is passed into the absorption tank with a heat exchanger, and the lye in the absorption tank It is a 35% WT KOH aqueous solution. The water vapor is condensed into water through the heat exchanger in the absorption tank, and the ammonium perfluorooctanoate is absorbed by the lye in the absorption tank. During the whole absorption process, adjust the pH value at 13 with lye. During the absorption process, use a stirrer to break up a large number of air bubbles generated.

[0031] (2) When the liquid level in the absorption tank reaches a certain height, the liquid is concentrated until the ...

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PUM

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Abstract

The invention is a method of recovering ammonium perfluoro octoate in the teflon resin production by dispersion method, belonging to chemical waste gas processing field, comprising bubbling absorbing, condensing, acidifying, and rectifying and purifying of the exhaust gas from cyclic oven, where the recovered ammonium perfluoro octoate has purity able to be up to 99% and can be reused in dispersion polymerization or other fluorine-containing organic matter intermediates. And the concentration of the ammonium perfluoro octoate in the processed gas is below 11mg / m3 (the highest allowable effluent concentration of fluoride is 11mg / m3), and can completely meet the effluent requirements.

Description

technical field [0001] The invention relates to a method for recovering and treating ammonium perfluorooctanoate in the production of polytetrafluoroethylene resin by a dispersion method, and belongs to the field of chemical waste gas 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 PTFE resin, namely suspension method and dispersion method, and the corresponding resins are suspension resin and dispersion resin. Dispersion resin is to add a certain amount of ammonium perfluorooctanoate (APFOS) as a dispersant during the polymerization process. The surface of the resulting resin has a certain amount of ammonium perfluorooctanoate. The resin is dried in an oven to sepa...

Claims

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Application Information

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IPC IPC(8): C07C53/21C07C51/42C02F1/58
Inventor 宋学章韩淑丽崔利永于康宁
Owner SHANDONG DONGYUE POLYMER MATERIAL
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