PET could be converted into the biodegradable pyrolized at 450 �C and the resulting terephthalic acid is used as a substrate for microorganisms, which convert it finally into PHA . Similar to the aforementioned approach is the combination of nanomaterials like carbon nanotubes with powdered orange peel as a composite material.
42.
Gradually new branches of chemical engineering and chemical technology research were being developed such as reaction engineering, homogeneous catalysis, studies of Non-Newtonian fluids, dynamics and control of chemical systems etc . Most of these new topics were introduced as necessary support to a large and long-term project of development of a complete production technology of terephthalic acid a polyesters.
43.
Industrially important carboxylic acids include acetic acid ( component of vinegar, precursor to solvents and coatings ), acrylic and methacrylic acids ( precursors to polymers, adhesives ), adipic acid ( polymers ), citric acid ( beverages ), ethylenediaminetetraacetic acid ( chelating agent ), fatty acids ( coatings ), maleic acid ( polymers ), propionic acid ( food preservative ), terephthalic acid ( polymers ).
