Decomposition of Gaseous Terephthalic Acid in the Presence of CaO

作者：Kumagai Shogo; Grause Guido; Kameda Tomohito; Takano Tatsuo; Horiuchi Hideki; Yoshioka Toshiald^*

来源：Industrial & Engineering Chemistry Research, 2011, 50(4): 1831-1836.

DOI：10.1021/ie101457k

The decomposition of PET during thermal treatment of municipal waste results in the formation of sublimating substances such as terephthalic acid (TPA) and benzoic acid, causing blockage and corrosion of pipes in the treatment facilities. To prevent these effects, TPA can be decarboxylated in the presence of calcium oxide (CaO) to obtain benzene as the main product. However, high concentrations of TPA cause the formation of large char fractions, reducing the yield of desired products. In this investigation, TPA Was decarboxylated using a fixed bed reactor filled with CaO. To increase the yield of benzene and reduce the carbonaceous residue, the effects of pyrolysis temperature and TPA feed rate were investigated. The best results were achieved at 500 degrees C and a TPA feed rate of 51 mg L(-1), yielding 67% benzene with a purity of 99.2%. and a carbonaceous residue containing 18% of the initial carbon.

• 出版日期2011-2-16