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US 2015/0087869 A1Published application
Capture of trifluoromethane using molecuar sieves
AssigneeE. I. Du Pont de Nemours and Company
InventorsDavid Richard Corbin, Mark Brandon Shiflett
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Abstract
A method for capturing trifluoromethane from a gaseous mixture in a vent stream from a chlorodifluoromethane manufacturing process is described. In the method, the gaseous mixture is contacted with a molecular sieve, such as a zeolite or activated carbon, having a pore opening of at least about 5 Angstroms and a Sanderson electronegativity of less than or equal to about 2.75. The method is useful for reducing emissions of trifluoromethane, which has a high global warming potential.
Claims9
A method for capturing trifluoromethane from a gaseous mixture comprising the step of:
- contacting the gaseous mixture with at least one molecular sieve at a pressure of about 0.1 MPa to about 4.8 MPa and a temperature of about 273 K to about 323 K for a period of time sufficient for the molecular sieve to remove at least a portion of the trifluoromethane;
- wherein:
- (a) the gaseous mixture is a vent stream from a chlorodifluoromethane manufacturing process, said gaseous mixture consisting essentially of trifluoromethane and nitrogen, oxygen, argon, and/or carbon dioxide;
- and
- (b) the molecular sieve has a pore opening of at least about 5 Angstroms and has a Sanderson electronegativity of less than or equal to about 2.75.
2 more elements
Dependencies are inferred from the claim text.