A cryo plant could separate them. As you cool off natural gas, the larger fractions (butane and propane) would liquify first and be removed, then ethane, and finally methane. What's left would be a mixture mostly of hydrogen with some helium, neon, and argon.
I doubt this would be the cheapest method for this components, but this is one of the processes for separating larger hydrocarbons, like heptanes and octanes.
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