Process for the manufacture of alkylene carbonates
AssigneeMontedison S.p.A.
InventorsCarlo Venturello, Rino D'Aloisio
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Abstract
A new process is disclosed for the synthesis of alkylene carbonates having from 2 to 4 carbon atoms in the chain, starting from a corresponding halohydrin having the formula: ##STR1## wherein R.sub.a, R.sub.b, R.sub.c and R.sub.d are independently hydrogen or alkyl, aryl, alkylaryl or arylalkyl radicals and where X is a halogen, characterized in that said halohydrin is reacted with a bicarbonate of a quaternary -onium compound, where "-onium" means ammonium, phosphonium, arsonium or stibonium, preferably using an organic solvent as diluent and operating in the presence of carbon dioxide.
Claims22
A process for the manufacture of alkylene carbonates, starting from a corresponding vicinal halohydrin of the formula:
- ##STR6## wherein R.sub.a, R.sub.b, R.sub.c, and R.sub.d, which can be the same or different, are hydrogen or alkyl, aryl, alkylaryl or arylalkyl radicals and X is a halogen, comprising reacting said halohydrin, in the presence of carbon dioxide and of an organic diluent, with the bicarbonate of a quaternary -onium compound, where "-onium" means ammonium, phosphomium, arsonium, or stibonium.
A process for synthesizing propylene carbonate, starting from propylene chlorohydrin, bromohydrin or iodohydrin, and in the presence of a diluent and of carbon dioxide, wherein said halohydrin is reacted with the bicarbonate of a quaternary -onium compound, using as said diluent an organic solvent.
Dependencies are inferred from the claim text.