| abstract |
REMOVAL OF NITROGEN WITH RECOVERY OF LIQUIDS FROM NATURAL GAS OF OPEN ISOBARIC REFRIGERATION. It is a process for the recovery of natural gas liquids, the process including: the fractionation of a gas flow comprising nitrogen, methane, ethane and propane and other C3 + hydrocarbons in at least two fractions, including a light fraction comprising nitrogen, methane, ethane and propane, and a heavy fraction comprising propane and other C3 + hydrocarbons; separating the light fraction into at least two fractions including a nitrogen-rich fraction and a nitrogen-free fraction in a first separator; the separation of the nitrogen-free fraction into a propane-rich fraction and a propane-free fraction in a second separator; feeding at least part of the fraction rich in propane in the fractionation in the form of a reflux; recycling at least part of the propane-free fraction in the first separator. In some embodiments, the nitrogen-rich fraction can be separated in a nitrogen removal unit to produce a nitrogen-free flow of natural gas and a flow of nitrogen-rich natural gas. |