| http://www.w3.org/ns/prov#value | - to separate oxygen, nitrogen, argon, and/or carbon dioxide; and/or to remove water, volatile organic compounds (including aromatic hydrocarbon compounds, such as benzene, cumene, xylene, toluene, and styrene; alkanes such as butane; cycloalkanes; halogenated hydrocarbons such as trichloroethylene, methylene chloride, and Freon; alcohols; esters; aldehydes such as formaldehyde; ketones; ethers; gly
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