Journal
CHEMICAL ENGINEERING JOURNAL
Volume 146, Issue 2, Pages 287-294Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2008.09.039
Keywords
PET; Alkaline hydrolysis; Kinetics; Shrinking core model; Phase transfer catalysts
Categories
Funding
- Spanish Ministerio de Educacion y Ciencia [CTQ2005-06247]
- Gobierno Vasco [Futures-Etortek 2007]
Ask authors/readers for more resources
The kinetics of the alkaline hydrolysis of PET in an aqueous slurry assisted by tributylhexadecylphosphonium bromide as suitable phase transfer catalyst was Studied at temperatures ranging from 60 to 80 degrees C. The results were adequately described by an unreacted shrinking core model that was first order with respect to sodium hydroxide concentration, quaternary salt concentration, and particle surface area and, hence, to the remaining particle mass raised to the 2/3 power. Temperature effects for both catalytic and non-catalytic steps were modelled with an Arrhenius equation resulting in activation energy values of 61-63 kJ mol(-1), thereby suggesting a similar mechanism for the alkaline hydrolysis with or without phase transfer catalyst. Hence, the notable enhancement in reaction rate observed when using the selected quaternary salt was mainly attributed to an increase in the concentration of the reactive hydroxide anion in the liquid-solid boundary layer. (C) 2008 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available