Patent ID: 11938467
Assignee: PTT EXPLORATION AND PRODUCTION PUBLIC COMPANY LIMITED
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 8:
9. A method for producing cyclic carbonates which comprises reacting epoxide-based compounds with carbon dioxide (CO2) in the presence of a catalyst system comprising:
a pre-catalyst; and
a co-catalyst
wherein said pre catalyst is BiCl3 and said co-catalyst is selected from tetra-n-butylammonium bromide (TBAB), tetra-n-butylammonium iodide (TBAI), tetra-n-butylphosphonium bromide (Pbu4Br), tetra-n-butylphosphonium iodide (Pbu4I) or mixtures thereof; and
wherein said method is performed using a mole ratio of the pre-catalyst:the co-catalyst:the epoxide-based compound of 1:2:50; at a pressure of carbon dioxide in the range of 1 to 100 bar; a temperature in the range of 10 to 200° C.; and a reaction time in the range of 1 to 8 hours.