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Natural gas, a vital energy resource, is often liquefied for efficient storage and transportation, especially for remote areas. This article delves into the technologies behind liquefied natural gas (LNG) production, focusing on purification methods such as absorption, adsorption, membrane separation, and cryogenic separation. The discussion also covers liquefaction processes, including nitrogen and methane expander cycles, as well as multi-refrigerant schemes. Factors such as capacity, location, and market demands significantly influence the choice of LNG technology. Ultimately, the selection process involves balancing technical, economic, and environmental considerations to meet diverse project needs.