Process for purifying polyether ketone ketone crude product by chelating agent
A technology of polyether ketone ketone crude product and polyether ketone ketone, which is applied in the field of purification of polyether ketone ketone crude product, can solve the problems of polyether ketone ketone viscosity decrease, product structure change, molecular weight decrease, etc., and achieve low cost and process energy saving Environmentally friendly and less toxic
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Embodiment 1
[0022] Take Al 3+ To 50 g of crude polyether ketone ketone with a content of 4300 ppm, 500 g of ethylenediamine di-o-phenylacetic acid aqueous solution with a mass concentration of 20% was added thereto, refluxed and stirred at 100° C. for 6 hours, cooled, and filtered to obtain a primary purified product.
[0023] The primary purified product was added to 1000ml of aqueous solution with pH 8 adjusted with ammonia water, and under the action of 20KHZ ultrasonic waves, ozone was refluxed at a rate of 1L / h for 3 hours, the temperature was lowered, and the secondary purified product was obtained by filtration.
[0024] The secondary purified product was added to 1000g of water, washed by reflux, filtered and dried to obtain pure white polyether ketone ketone. As detected by ICP, its Al 3+ The content is 23ppm, which meets the high-temperature use and processing requirements of polyether ketone ketone.
Embodiment 2
[0026] Take Al 3+ To 50 g of crude polyether ketone ketone with a content of 4300 ppm, 750 g of ethylenediamine di-o-phenylacetic acid aqueous solution with a mass concentration of 10% was added thereto, refluxed and stirred at 100° C. for 8 hours, cooled, and filtered to obtain a primary purified product.
[0027] The primary purified product was added to 750ml of aqueous solution with pH 9 adjusted with ammonia water, under the action of 20KHZ ultrasonic waves, ozone was refluxed at a rate of 0.5L / h for 4 hours, the temperature was lowered, and the secondary purified product was obtained by filtration.
[0028] The secondary purified product was added to 1250 g of water, washed by reflux, filtered and dried to obtain pure white polyether ketone ketone. As detected by ICP, its Al 3+ The content is 32ppm, which meets the high-temperature use and processing requirements of polyether ketone ketone.
Embodiment 3
[0030] Take Al 3+ To 50 g of crude polyether ketone ketone with a content of 4300 ppm, 1000 g of ethylenediamine di-o-phenylacetic acid aqueous solution with a mass concentration of 1% was added thereto, refluxed and stirred at 100° C. for 10 hours, cooled, and filtered to obtain a primary purified product.
[0031] The primary purified product was added to 500ml of aqueous solution with a pH of 10 adjusted by ammonia water, and under the action of 20KHZ ultrasonic waves, ozone was refluxed at a rate of 0.1L / h for 5 hours, the temperature was lowered, and the secondary purified product was obtained by filtration.
[0032] The secondary purified product was added to 1500g of water, washed by reflux, filtered and dried to obtain pure white polyether ketone ketone. As detected by ICP, its Al 3+ The content is 41ppm, which meets the high-temperature use and processing requirements of polyether ketone ketone.
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