A retro fitted unit to an existing simple refrigerated natural gas plant that substantially increases the amounts of propane, butanes and natural gasoline, or ethane, propane, butanes and natural gasoline recovered from the natural gas in the existing gas treatment plant, wherein in one embodiment...http://www.google.co.uk/patents/US5687584?utm_source=gb-gplus-sharePatent US5687584 - Absorption process with solvent pre-saturation
