Natural gas is then introduced into a natural gas liquefier (35), resulting in liquefaction of the natural gas.

The invention is useful for producing helium and liquid nitrogen from a natural gas liquefying residue gas.

A method for integrating a liquefied natural gas liquefier system with production of liquefied natural gas from a methane-containing gas stream.

Middlebrook invented the system in his workshop, and called it the broad-spectrum fractional sequestration combustion gas liquefier.