“…As one of the most important aromatic compounds, terephthalic acid (TPA) has been widely used in organic synthesis, particularly in the polyester industry. − Commercially, the majority of TPA is produced by the air oxidation of para -xylene (PX) in acetic acid at temperatures ranging from 150 to 210 °C, which is catalyzed by cobalt and manganese salts and promoted by bromine. , Currently, there are two popular oxidation processes: one is represented by Mitsubishi processes (MPCs), and the other is represented by BP Amoco processes. , It has been shown that the reaction is not effective when the oxygen concentration is higher. − Both Cao et al and Digruov et al proposed that the oxidation reaction of PX is of the zero order with respect to the oxygen concentration when the partial pressure of oxygen is above 20 kPa at 80–130 °C and 1 atm. Gai further proposed that this reaction is still a zero-order reaction with respect to the oxygen concentration when the partial pressure of oxygen is higher than 200 kPa at 216 °C under 2.47 MPa.…”