	US 11,897,860 B2
	Direct synthesis of cyclic carbonates using choline chloride as catalyst under mild conditions
Analette Carrasco, Missouri City, TX (US); Jerry J. Weers, Richmond, TX (US); Catherine C Blackwell, Fulshear, TX (US); Sankaran Murugesan, Katy, TX (US); Xiaofeng Wang, Katy, TX (US); Douglas Nugent, La Porte, TX (US); and Corby A. Roberts, League City, TX (US)
Assigned to Baker Hughes Oilfield Operations LLC, Houston, TX (US)
Filed by Baker Hughes Oilfield Operations LLC, Houston, TX (US)
Filed on Mar. 14, 2022, as Appl. No. 17/694,287.
Prior Publication US 2023/0286936 A1, Sep. 14, 2023
Int. Cl. C07D 317/16 (2006.01); C07D 317/38 (2006.01); B01J 31/02 (2006.01)

CPC C07D 317/38 (2013.01) [B01J 31/0239 (2013.01); C07C 2527/24 (2013.01)]

19 Claims

1. A method for direct synthesis of cyclic carbonates comprising:

reacting at least one epoxide with carbon dioxide in the presence of a choline catalyst at a temperature between about 25° C. to 150° C. and a pressure of from about atmospheric to 75 psi (0.52 MPa), in a cyclic carbonate solvent; and

recovering at least one cyclic carbonate product.