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

Claim 3:
4. A method for preparation of a catalyst system for producing cyclic carbonates according to claim 1 comprising steps of:
(a) refluxing a silane compound having formula (III) with N-methylimidazole in an organic solvent at a temperature of 100 to 150° C. for 12 to 72 hours, wherein the mole ratio between the silane compound and N-methylimidazole is in the range of 5:1 to 1:5 to obtain compound (I) according to claim 1;, wherein:
A is selected from bromide (Br−) or iodide (I−);
(b) refluxing the mixture of the compound (I) obtained from step (a) and silica (SiO2) support in an organic solvent at a temperature in the range of 100 to 200° C. for 5 to 50 hours, wherein the concentration of compound (I) is in the range of 5 to 15% v/v and the concentration of silica (SiO2) support is in the range of 10 to 20% w/v; and
(c) contacting BiCl3 with the silica support obtained from step (b) for 1 to 5 hours, wherein the concentration of BiCl3 is in the range of 5 to 10% by weight of the silica support.