Fe(Ⅲ)EDTA as an efficient redox cocatalyst for oxidative carbonylation of phenol to diphenyl carbonate
Fe(III)EDTA作为氧化羰化苯酚合成碳酸二苯酯一种有效的氧化还原催化助剂

The synthesis of diphenyl carbonate (DPC) by oxidative carbonylation of phenol was studied. Fe(Ⅲ)EDTA was found to be efficient in PdCl2/Fe(Ⅲ)EDTA/1,4-benzoquinone (BQ)/ tetrabutylammonium bromide (TBAB) catalyst system. The role of each component in the catalyst system was discussed. A catalytic mechanism was proposed. The optimum reaction temperature for oxidative carbonylation of phenol to DPC was 100℃～120℃. When the reaction was catalyzed over PdCl2/Fe(Ⅲ)EDTA/BQ/Bu4NBr, at 100℃,pCO=2.0MPa,pO2=0.5MPa,phenol 0.5 mol, PdCl2 0.28mmol, n(PdCl2)∶n(redox cocat.)∶n(BQ)∶n(Bu4NBr)=1∶1∶10∶40, 4 A molecular sieve 5.0 g, 4 h, the yield and selectivity of DPC were 8.35% and 97.5% respectively. High pressure was favorable for the production of DPC.