	US 11,938,467 B2
	Catalyst system for producing cyclic carbonates and method related thereto
Taradon Piromchart, Bangkok (TH); and Valerio D'Elia, Rayong (TH)
Assigned to PTT EXPLORATION AND PRODUCTION PUBLIC COMPANY LIMITED, Bangkok (TH)
Filed by PTT EXPLORATION AND PRODUCTION PUBLIC COMPANY LIMITED, Bangkok (TH)
Filed on Mar. 18, 2021, as Appl. No. 17/206,077.
Application 17/206,077 is a continuation of application No. PCT/TH2019/000041, filed on Sep. 18, 2019.
Claims priority of provisional application 62/732,987, filed on Sep. 18, 2018.
Prior Publication US 2021/0205798 A1, Jul. 8, 2021
Int. Cl. B01J 31/02 (2006.01); B01J 21/08 (2006.01); B01J 23/18 (2006.01); B01J 31/12 (2006.01); B01J 35/12 (2006.01); B01J 37/04 (2006.01); B01J 37/08 (2006.01); C07F 7/18 (2006.01); C07D 317/36 (2006.01)

CPC B01J 31/0268 (2013.01) [B01J 21/08 (2013.01); B01J 23/18 (2013.01); B01J 31/0239 (2013.01); B01J 31/0279 (2013.01); B01J 31/0298 (2013.01); B01J 31/121 (2013.01); B01J 35/12 (2013.01); B01J 37/04 (2013.01); B01J 37/08 (2013.01); C07F 7/1804 (2013.01); C07D 317/36 (2013.01)]

16 Claims

1. 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 BiCl₃and 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 in the range of 1:1:10 to 1:3:50; 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.