Extracting anti-hydrate compounds contained in condensed-hydrocarbon liquid feedstock, useful in processing natural gas involves contacting feedstock with non-aqueous ionic liquid; and regenerating ionic liquid charged with anti-hydrates

摘要

Extracting (M1) anti-hydrate compounds (A1) contained in a condensed-hydrocarbon liquid feedstock involves contacting the feedstock with a non-aqueous ionic liquid (I1) so that (I1) is charged with (A1) and the feedstock is impoverished of (A1); separating the feedstock impoverished of (A1) and (I1) charged with (A1); and regenerating (I1) charged with (A1) to separate (A1) and recover (I1) impoverished of (A1). Extracting (M1) anti-hydrate compounds (A1) contained in a condensed-hydrocarbon liquid feedstock involves (A) contacting the feedstock with a non-aqueous ionic liquid (I1) of formula Q +>A ->so that (I1) is charged with (A1) and the feedstock is impoverished of (A1); (B) separating the feedstock impoverished of (A1) and (I1) charged with (A1); and (C) regenerating (I1) charged with (A1) to separate (A1) and recover (I1) impoverished of (A1). Q +>ammonium, phosphonium and/or sulfonium cation;and A ->an anion able to form a liquid salt. An independent claim is included for processing (M2) a natural gas involving (1) mixing the natural gas with (A1); (2) cooling the mixture to obtain a gas phase containing methane and ethane, a first liquid phase containing hydrocarbons and (A1), and a second liquid phase containing water and (A1); (3) separating the gas phase, the first liquid phase and the second liquid phase; and (4) treating the first liquid phase by the method (M1) where the first liquid phase corresponds to the feedstock in step (A).