	US 12,325,675 B2
	Dehydration method for fluorine-based hydrocarbon compound
Yuusuke Etou, Osaka (JP); and Shingo Nakamura, Osaka (JP)
Assigned to DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed by DAIKIN INDUSTRIES, LTD., Osaka (JP)
Filed on May 25, 2022, as Appl. No. 17/824,463.
Application 17/824,463 is a continuation of application No. PCT/JP2020/044095, filed on Nov. 26, 2020.
Claims priority of application No. 2019-215296 (JP), filed on Nov. 28, 2019.
Prior Publication US 2022/0281786 A1, Sep. 8, 2022
Int. Cl. C07C 17/389 (2006.01)

CPC C07C 17/389 (2013.01)

8 Claims

1. A method for dehydrating a composition containing a fluorine-based hydrocarbon compound,

wherein the fluorine-based hydrocarbon compound contains 1,1,1,2-tetrafluoroethane (HFC-134a),

the method comprising bringing the composition into contact with a zeolite having a ratio of silica to alumina (SiO₂/Al₂O₃) of 5 or more to dehydrate the composition, and to remove 1,1,2,2-tetrafluoroethane (HFC-134) from the composition,

wherein the composition after dehydration has a moisture content of less than 3 ppmwt, and has an HFC-134 content of less than 3 ppmwt.