Environmental Engineering Reference
In-Depth Information
Glycolysis: Reacting PET with excess ethylene glycol in the presence of
sodium sulfate yielded BHET (see below) as the primary product (Shukla et
al., 2009; Viana et al., 2011; Wang et al., 2009).
Aminolysis of PET with ethanolamine yields bis(2-hydroxy ethylene)
terephthalamide (BHETA) (Shukla and Harad, 2006).
Alcoholysis of PET via methanolysis or ethanolysis yields dimethyl
terephthalate and diethyl terephthalate respectively (Jie et al., 2006;
Kurokawa et al., 2003). The reaction can also be carried out under
supercritical conditions (Castro et al., 2006; Goto, 2009).
Selected chemolysis processes for PET are illustrated in Figure 9.8 and
tabulated in Table 9.6 . These reactions yield either the original monomers
or products that can be converted to other monomers. Hydrolysis can be
effectively used with PET and polyurethane waste plastics in feedstock
recovery (Zia et al., 2007). Reaction conditions employed are varied and
these selected references do not cover them exhaustively. Aromatic
polyesters, PET and poly(butylene terephthalate), have been studied
intensively for feedstock recovery. PET is extensively used in soda bottles
and less than 30% of the product is mechanically recycled.
 
 
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