Patent ID: 11938468
Assignee: PTT EXPLORATION AND PRODUCTION PUBLIC COMPANY LIMITED
Field: Chemical engineering (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 12:
13. A method for producing cyclic carbonates from the reaction of carbon dioxide and epoxide-based compounds which comprises reacting epoxide-based compounds with carbon dioxide in the presence of a catalyst system comprising:
a pre-catalyst, which is BiCl3 having amounts in the range from 5 to 10% by weight of silica support;
a compound having formula (I), , and
a silica (SiO2) support
where:
Y is selected from bromide (Br−) or iodide (I−);
R1, R2, and R3 are methyl group or R1,R2, and R3 are taken together to form a heteroaryl ring having formula (II), wherein said method is performed using a concentration of the catalyst system in the range of 0.1 to 20 mol% relative to the epoxide-based compounds; 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 1-8 hours.