NOVELTY - Gas processing facility (100) comprises gas separation unit (130) with fractionation vessel and gas inlet for receiving gas mixture comprising methane, adsorbent material for contaminants, outlet for releasing methane-rich gas stream (140); high-pressure expander cycle refrigeration system (150) to compress methane-rich gas stream to 1000 psia, providing compressed gas feed stream; cooler for producing compressed, cooled gaseous feed stream; and first expander for expanding cooled, compressed, gaseous feed stream to form product stream having liquid fraction and remaining vapor fraction.    USE - For producing natural gas by liquefaction of gaseous fluids such as hydrocarbon gases produced in remote locations.    ADVANTAGE - The present facility has more compact and more efficient design than conventional liquefied natural gas (LNG) facilities, and thus the facility is ideally suited for LNG facilities that are offshore or are located in remote locations e.g. on floating platform or gravity-based platform offshore. The systems and methods allows for the formation of LNG using facility having less weight than conventional facilities; and also permits rapid tool-up for offshore production operations.    DETAILED DESCRIPTION - Gas processing facility (100) for liquefaction of natural gas feed stream comprises gas separation unit (130) with fractionation vessel having gas inlet for receiving natural gas mixture comprising methane, adsorbent material which has kinetic selectivity for contaminants over methane greater than 5, such that the contaminants become kinetically adsorbed within adsorbent material, and gas outlet for releasing methane-rich gas stream (140); and high-pressure expander cycle refrigeration system (150) comprised of first compression unit to receive substantial portion of methane-rich gas stream and to compress methane-rich gas stream to about 1000 psia (6895 kPa), and providing compressed gas feed stream; first cooler configured to cool compressed gas feed stream to form compressed, cooled gaseous feed stream; and first expander configured to expand cooled, compressed, gaseous feed stream to form product stream having liquid fraction and remaining vapor fraction. An INDEPENDENT CLAIM is included for liquefying natural gas feed stream involving receiving natural gas feed stream at gas processing facility; passing the natural gas feed stream through dehydration vessel (120) to remove portion of water from natural gas feed stream; releasing dehydrated natural gas feed stream to gas separation unit as dehydrated natural gas feed stream in the gas separation unit; passing the dehydrated natural gas feed stream through series of adsorbent beds in order to separate methane gas from contaminants in dehydrated natural gas feed stream using adsorptive kinetic separation; releasing methane-rich gas stream from gas separation unit; directing methane-rich gas stream into high-pressure expander cycle refrigeration system; compressing the methane-rich gas stream to form compressed gas feed stream; cooling the compressed gas feed stream to form compressed, cooled gaseous feed stream; expanding the cooled, compressed, gaseous feed stream to form product stream having liquid fraction and remaining vapor fraction.    DESCRIPTION OF DRAWING(S) - The figure shows schematic flow diagram of facility for producing liquefied natural gas (LNG).    Gas processing facility (100)    Dehydration vessel (120)    Gas separation unit (130)    Methane-rich gas stream (140)    High-pressure expander cycle refrigeration system (150)