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Recycling Acetic Acid from Polarizing Film of Waste Liquid Crystal Display Panels by Sub/Supercritical Water Treatments
journal contribution
posted on 2015-05-19, 00:00 authored by Ruixue Wang, Ya Chen, Zhenming XuWaste liquid crystal
display (LCD) panels mainly contain inorganic
materials (glass substrate) and organic materials (polarizing film
and liquid crystal). The organic materials should be removed first
since containing polarizing film and liquid crystal is to the disadvantage
of the indium recycling process. In the present study, an efficient
and environmentally friendly process to obtain acetic acid from waste
LCD panels by sub/supercritical water treatments is investigated.
Furthermore, a well-founded reaction mechanism is proposed. Several
highlights of this study are summarized as follows: (i) 99.77% of
organic matters are removed, which means the present technology is
quite efficient to recycle the organic matters; (ii) a yield of 78.23%
acetic acid, a quite important fossil energy based chemical product
is obtained, which can reduce the consumption of fossil energy for
producing acetic acid; (iii) supercritical water acts as an ideal
solvent, a requisite reactant as well as an efficient acid–base
catalyst, and this is quite significant in accordance with the “Principles
of Green Chemistry”. In a word, the organic matters of waste
LCD panels are recycled without environmental pollution. Meanwhile,
this study provides new opportunities for alternating fossil-based
chemical products for sustainable development, converting “waste”
into “fossil-based chemicals”.