A new process for the synthesis of diphenyl carbonate from dimethyl carbonate and phenol over heterogeneous catalysts
- 828 Downloads
The two-step synthesis of diphenyl carbonate (DPC) from dimethyl carbonate (DMC) and phenol has been compared in liquid phase and gas phase, both over heterogeneous catalysts. In the first step, equilibrium yields of methyl phenyl carbonate (MPC) in the transesterification of DMC and phenol were very low at low temperatures in the liquid phase although reaction rates were fast. This endothermic reaction was more favorable at high temperatures in the gas-phase reaction. Titanium oxide catalysts supported on SiO2 or activated carbon were found to be effective in a continuous gas flow reactor. In case of the second step, the disproportionation of MPC, selective formation of DPC was not feasible in the gas-phase reaction due to extensive side reactions. However, there was no by-product in the liquid-phase reaction over the TiO2/SiO2 catalyst. Therefore, our proposed two-step synthesis process consists of the gas-phase transesterification of DMC and phenol followed by the liquid-phase disproportionation of MPC to DPC, both over the TiO2/SiO2 catalyst.
Unable to display preview. Download preview PDF.
- Chemistry in Britain 30 (1994) 970.Google Scholar
- U. Curtius, L. Bottoenbruch and H. Schnell, US Patent 3 442 854 (1969).Google Scholar
- H. Yamana, T. Kuni, T. Furusawa, H. Nakai and Y. Hiro, US Patent 3 888 826 (1975).Google Scholar
- D. Brunelle, US Patent 4 321 356 (1982).Google Scholar
- J.B. Starr and A. Ko, US Patent 4 383 092 (1983).Google Scholar
- K. Komiya, S. Fukuoka, M. Aminaka, K. Hasegawa, H. Hachiya, H. Okamoto, T. Watanabe, H. Yoneda, I. Fukawa and T. Dozono, in: Green Chemistry: Designing Chemistry for the Environment, eds. P.T. Anastas and T.C. Williamson (Am. Chem. Soc., Washington, 1996) p. 20.Google Scholar
- S. Fukuoka, M. Tojo and M. Kawamura, US Patent 5 210 268 (1993).Google Scholar
- G.E. Harrison, A.J. Dennis and M. Sharif, US Patent 5 426 207 (1995).Google Scholar
- K. Murata, K. Kawahashi and M. Watabiki, US Patent 5 380 908 (1995).Google Scholar
- W.B. Kim, Synthesis of diphenylcarbonate over heterogeneous catalysts, MS thesis, Pohang University of Science and Technology (1998).Google Scholar
- W.B. Kim and J.S. Lee, J. Catal., submitted.Google Scholar
- W.B. Kim, J.S. Lee and Y.G. Kim, Appl. Catal. A, in preparation.Google Scholar