Recycling Of Poly Lactic Acid Into Lactic Acid
With High Temperature And High Pressure Water
Author(s)
M. Faisal1, T. Saeki, H. Tsuji, H. Daimon & K. Fujie
Abstract
The converting of poly L-lactic acid into its monomer (lactic acid) was
performed using high temperature and high pressure water at the temperature
range of 250-350°C and for a period of 30 minutes. The results show that
temperature and reaction time affected the recycling efficiency and optical
selectivity. Under the tested conditions, the highest amount of lactic acid (yield
of 90.7-92.5%) was obtained at temperature of 250°C and reaction time of 10-20
min. The remains were an un-harmful byproduct. A study on the effect of
temperature on the optical purity of lactic acid product demonstrated L-lactic
acid was predominant at a low range temperature of 250-260°C. At higher
temperature, racemic mixture was observed. Based on our experimental results,
the method was found to be simple and promising for recycling of poly lactic
acid into its monomer, lactic acid.
1 Introduction
The replacement of highly biodegradation-resistant and petroleum-based plastics
with biodegradable ones, such as poly lactic acid (PLA), is of interest to
researchers. PLA can be synthesized from renewable resources (e.g. corn, wheat,
potato or sugar beat) by fermentation. Due to its biocompatibility and
biodegradability, PLA has widespread potential use in medicine, agriculture, and
packaging applications [1,2]. Recently, Cargill Dow LLC has started to operate
the PLA plant producing of 140,000 t/year in November 2001. They are planning
to increase annual output up to 450,000t in 2010 [3].
Keywords
Related Book
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