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 PdCl2/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 PdCl2/Fe(III)EDTA/BQ/Bu4NBr, at 100℃，p CO=2.0MPa，pO2=0.5MPa，phenol 0.5mol, PdCl2 0.28mmol, nPdCl2)∶n(redox cocat.)∶n(BQ)∶n(Bu4NBr)=1∶1∶10∶40, 4 A molecular sieve 5.0g, 4h, the yield and selectivity of DPC were 8.35% and 97.5% respectively. High pressure was favorable for the production of DPC.