A process for producing various organic carbonates by performing
transesterification and disproportionation reactions in dual vapor/liquid
phase mode preferably in the presence of solid catalyst composition
selected from the group consisting of oxides, hydroxides, oxyhydroxides
or alkoxides of two to four elements from Group IV, V and VI of the
Periodic Table supported on porous material which has surface hydroxyl
groups and the method of reactivating catalyst deactivated by polymer
deposition by contacting the deactivated catalyst with a solution of
hydroxy containing compound in a solvent such as benzene or THF.