Turboexpander-based gas liquefaction units are noted for having the least dimensions and mass relative to their capacity, making them compact and easier to transport, particularly for small to mid-scale applications. For a theoretical installation producing approximately 5 kg of liquid methane per second, which equates to 432 tons per day, an industrial-scale solution is necessary. The discussion highlights the importance of understanding the specific gas type, as methane and propane have different liquefaction requirements. Additionally, Joule-Thomson coolers and mixed-refrigerant systems are mentioned as alternatives for ultra-portable systems, although they may offer lower efficiency. Overall, the choice of liquefaction unit depends on the scale of production and the specific gas being liquefied.
