Main > ORGANIC CHEMICALS > Aliphatics > Carbonate. > ACyclic Carbonates > Di-Alkyl Carbonates > Patent > Claims > Claim 1: Urea+1-2C Alkanol Reaction > in pres.: Quat. Ammonium Compd. > Catalyst under Pressure & Temp.= > 100-250C. Claim 2: Catalyst Select: > TetraMethylAmmonium Carbonate > Etc. Claims 3,4: Ammonia ByProdt. > Removed from the Reaction System

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