Process for preparing diaryl carbonates where the catalyst is thermically activated in a separated aparatus

摘要

A process for the production of an aromatic carbonate comprises reaction of an aromatic hydroxyl compound with CO and O2 in the presence of a catalyst system comprising at least two metal compounds with preheating of at least a portion of the reaction mixture in a first apparatus prior to reaction at a higher temperature and for a longer time in a second apparatus. A process for the production of an aromatic carbonate of formula ROC(O)OR (I) comprises reaction of an aromatic hydroxyl compound ROH (II) of formula with CO and O2 in the presence of a catalyst system comprising compounds (III) of Ru, Os, Rh, Ir, Ni, Pd and/or Pt and compounds (IV) of Sc, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Fe, Ni, Co, Cu, Ag, Au, Zn, Cd, Hg, Ga, In, Tl, Ge, Sn, Sb, Bi and/or Pb for a time t1 at an average temperature T1 in a first reactor whereby at least a portion of the aromatic hydroxyl compound (II) and catalyst components (III) and (IV) are heated together for a time t2 of less than 50% of t1 at a temperature T2 that is on average at least 15 K below T1 in the presence of CO and O2 in a second apparatus. R : aromatic group.