A company has a process stream made up of a variety of gases and molecules. They seek effective industrial-scale technologies that separate methane from other hydrocarbons in the stream, as well as from lighter and heavier molecules. The large-scale gas streams must be separated into their constituent molecules at purity rates above 90%. Proposed solutions should address boundary conditions, required or expected pressures, operating temperatures, and compatibility with various molecules and gas stream contaminants. The technologies must also be feasible for process streams that run in the 100,000 tons per annum or greater.