Patent ID: 6596894
Filing Date: 2003-07-22
Classification: B01D,C07C,Y02P

Abstract:
A method for the continuous manufacturing of aromatic carbonates comprising providing a single distillation column comprising a lower reactive section having a top and bottom subsection, and an upper rectification section having a top subsection; feeding to the top subsection of the reactive section a first stream comprising an aryl alcohol and a catalyst; feeding to the bottom subsection of the reactive section a second stream containing a dialkylcarbonate, wherein the first and second streams are fed in sufficient quantities such that the weight ratio between the dialkyl carbonate and aryl alcohol fed into the distillation column is between 4 and 6, and a temperature at the bottom of the column is between 220Â° C. and 240Â° C., wherein an operating pressure of the column measured at the top of the column is from 3 to 6 kg/cm2 Gauge, and wherein the reaction is carried out in the presence of a catalyst based on alkoxides or aryl oxides of titanium, wherein said catalyst is present in a quantity of from 0.5 to 1.0 molar percent based on the aryl alcohol.