Chemical Recycling Of PET By Alkaline
Hydrolysis In The Presence Of Quaternary
Phosphonium And Ammonium Salts As Phase
Transfer Catalysts
Author(s)
R. López-Fonseca, M. P. González-Marcos,
J. R. González-Velasco & J. I. Gutiérrez-Ortiz
Abstract
Chemical or tertiary recycling of waste polymers including PET, poly(ethylene
terephthalate), is the only method according to the principles of Sustainable
Development, since it leads to the formation of the raw materials (monomers)
from which the polymer is made of. This work has been focused on the
determination of the kinetics of the depolymerisation of PET by means of
alkaline hydrolysis and on the identification of the catalytic behaviour, if any, of
a series of phosphonium and ammonium salts as phase transfer catalysts (9 salts
with varying alkyl groups, central cation (N or P) and anion (Cl-, Br-, I-, OH-)).
Among the catalysts tested tributylhexadecylphosphonium bromide
(3Bu6DPB) is found to be the most effective catalyst. Complete conversion of
PET with considerably low catalyst concentration and temperature can be
achieved. The selected phase transfer catalyst fulfils the requirements of having
enough character in order to be lipophilic, while small enough in order to avoid
steric hindrance. The time for complete hydrolysis (>90% conversion) of solid
PET under alkaline conditions with 3Bu6DPB at 80 ºC is 1.5 hours and 10 hours
without 3Bu6DPB.
Keywords: chemical recycling, PET, alkaline hydrolysis, kinetics, phase transfer
catalysts.
Keywords
chemical recycling, PET, alkaline hydrolysis, kinetics, phase transfer
catalysts.
Related Book
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