Efficiency is the biggest hurdle. According to fundamental thermodynamic laws , as the temperature drops, the work required to remove a single unit of heat increases exponentially.
In this realm, even the smallest heat leak can ruin a process. Engineers must use Multilayer Insulation (MLI) —essentially "space blankets" in a vacuum—to prevent parasitic heat from boiling off precious liquid. 2. The Heavy Lifters: Air Separation Units (ASU) Cryogenic Process Engineering
At cryogenic temperatures, materials stop behaving in "normal" ways. The kinetic energy of molecules diminishes so significantly that gases transition into compact liquid states with unique crystalline structures. Efficiency is the biggest hurdle