Catalyst for making dialkyl carbonates
AssigneeCatalytic Distillation Technologies
InventorJ. Yong Ryu
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Abstract
A novel catalyst, which is a complex of organotin with a high boiling electron donor compound acting as solvent which includes bidentate ligands which form 1:1 bidentate and/or 1:2 monodentate adducts with R'.sub.2 SnX.sub.2 (X=Cl, R'O, R'COO or R'COS), R'.sub.3 SnX, R'.sub.2 SnO, Ph.sub.3-n R'SnX.sub.n or Ph.sub.4-n SnX.sub.n (wherein R'=C.sub.q H.sub.2q-1 n=0, 1 or 2 and q=2 to 12) and mixtures thereof, such as materials having the general formula RO[CH.sub.2 (CH.sub.2).sub.k CH.sub.2 O].sub.m R, wherein each R is independently selected from C.sub.1-12 alkyl, alkaryl or aralkyl moieties, k=0, 1, 2 or 3 and m=1, 2, 3, 4 or 5. The catalyst is useful in the process for producing dialkyl carbonates, such as dimethyl carbonate, from the reaction of a primary alcohol with urea.
Claims15
A homogeneous catalyst useful for reacting urea and primary alcohols to produce dialkyl carbonates comprising a complex of an organotin compound with a high boiling electron donor atom compound comprising bidentate ligand which form 1:1 bidentate and/or 1:2 monodentate adducts with R'.sub.2 SnX.sub.2 (X=Cl, R'O, R'COO or R'COS), R'.sub.3 SnX, R'.sub.2 SnO, Ph.sub.3-n R'SnX.sub.n or Ph.sub.4-n SnX.sub.n (wherein R'=C.sub.q H.sub.2q-1 n=0, 1 or 2 and q=2 to 12) and mixtures thereof.
Dependencies are inferred from the claim text.