Environmental Engineering Reference
In-Depth Information
hydro-glycolysis, aminolysis, methanolysis, or acid cleavage. Examples of
some of the potential types of reactions for feedstock recycling can be
illustrated for PET as follows:
Figure 9.7
Basic recovery options available for plastics waste.
Hydrolysis:Hydrolysisofplastics(Lopez-Fonsecaetal.,2009)withwateror
dilutealkaliyieldsmonomersorothercompounds.Thermosetpolyurethane
foam for instance is hydrolyzed into polyols and amines by superheated
steam at 230-315°C in about 15 min (Lonescu, 2005).
Similarly, PET can be hydrolyzed under acidic or basic conditions to yield
terephthalic acid (Carvalho et al., 2006; Paszun and Spychaj, 1997; Sato et
al., 2006).
