Patent ID: 9546147
Date: 2017-01-17
CPC Classifications: B01J,C07C,C07D

Claim:
1. A method of producing 6-membered cyclic carbonates comprising the steps of: a. providing a polyol and a dialkyl carbonate or a diphenyl carbonate; b. forming a mixture of a polyol and dialkyl carbonate or a diphenyl carbonate, said mixture having a dialkyl carbonate or the diphenyl carbonate ratio to the polyol of 0.1-3000 wt %; c. optionally adding a solvent; d. adding as an adsorbent molecular sieves to said mixture; and e. heating the mixture to a temperature of 100° C. or more to obtain 6-membered cyclic carbonates, wherein no metal catalyst is used in producing the 6-membered cyclic carbonates, the dialkyl carbonate is dimethyl or diethyl carbonate, and the weight ratio of molecular sieves to polyol is 2:1 or more.