Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 114, Issue 6, Pages 3561-3565Publisher
WILEY
DOI: 10.1002/app.30981
Keywords
polyester; recycling; ionic liquid; hydrolysis; degradation
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The hydrolysis of poly(ethylene terephthalate) (PET) was studied using ionic liquid 1-n-butyl-3-methylimidazolium chloride ([Bmim][Cl]) as solvent and acid-functionalized ionic liquid 1-methyl-3-(3-sulfopropyl)-imidazolium hydrogen sulfate ([HSO3-pmim][HSO4]) as catalyst. The effects of temperature, time, and dosages of solvent and catalyst on hydrolysis results were examined. Under the optimum conditions of m(PET) m(H2O) : m([Bmim][Cl]) : m([HSO3-pmim][HSO4]) = 3 4 : 6 : 0.6, reaction temperature 170 degrees C and time 4.5 h, the conversion of PET and the yield of terephthalic acid (TPA) were almost 100% and >= 88%, respectively. After easily separated from the product, the ionic liquids could be reused eight times without obvious decrease in the conversion of PET and yield of TPA. Hence, an environmental friendly strategy for chemical recycling of PET was developed. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 114: 3561-3565, 2009
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