the present invention relates to a process of recovering aromatic dicarboxylic acids with low metal contaminants from manufactured articles , such as beverage bottles , fibers and films , comprising aromatic polyesters , whether or not those articles are contaminated with pvc or chlorinated compounds , or from waste from processing of these polyesters . in particular , the invention relates to the recovery of terephthalic acid , isophthalic acid and 2 , 6 - naphthalene dicarboxylic acid from bottles for recycling which are made of pet , pen or aromatic polyester copolymers .