METHOD OF LIQUEFACTION OF THE STREAM OF THE NATURAL GAS RICH WITH THE HYDROCARBONS WITH SIMULTANEOUS EXTRACTION OF THE C/C-RICH FRACTION Russian patent published in 2007 - IPC F25J3/02 

FIELD: natural gas industry; other industries; methods of liquefaction of the streams of the natural gas rich with the hydrocarbons with simultaneous extraction of the С₃/С₄- rich fraction.

SUBSTANCE: the invention presents the method of liquefaction of the stream of the natural gas with simultaneous extraction of the С₃/С₄- rich fraction at the expense of the heat-exchange of the natural gas stream rich with the hydrocarbons at least with one cooling agent and-or one mixture of the cooling agents and feeding of the being liquefied natural gas stream after its preliminary cooling into the separation column, in which from the liquefied stream of the natural gas separate the highest hydrocarbons with the subsequent cooling and liquefaction. At that in the capacity of the wet refluxes feed into the separation column С₂₊-rich fraction extracted from the natural gas stream at its subsequent cooling. С₄/С₅-rich fraction (20, 35) is fed directly and-or indirectly as the refluxes into the separation column in the point, which is disposed in the upper part of the separation column (Т1) or coincides with the point feeding in it of С₂₊-rich fraction.

EFFECT: the invention ensures the increased efficiency of the method of liquefaction of the streams of the natural gas rich with the hydrocarbons with simultaneous extraction of the С_З/С₄- rich fraction.

7 cl, 2 dwg