METHOD OF LIQUEFACTION OF THE STREAM OF THE NATURAL GAS RICH WITH THE HYDROCARBONS WITH THE SIMULTANEOUS EXTRACTION OF C RICH FRACTION WITH THE HIGH YIELD Russian patent published in 2008 - IPC F25J1/02 F25J3/00 

FIELD: natural gas industry; other industries; methods of liquefaction of the rich with the hydrocarbons gaseous stream with the simultaneous extraction of С₃₊-rich fraction.

SUBSTANCE: the invention presents the method of liquefaction of the rich with the hydrocarbons stream, first of all the stream of the natural gas with the simultaneous extraction of С₃₊ - rich fraction with the high yield at the expense of the heat-exchange of the rich with the hydrocarbons stream at least with three having the different composition mixed cooling agents of the cascade correspondingly consisting of at least three refrigeration cycles. According to the invention the rich with the hydrocarbons stream (1, 1') is exposed to dilation (X) before its division into C_2-- the rich fraction and С₃₊ - the rich fraction. The exposed to dilation the rich with the hydrocarbons stream (2)is fed to the stage of absorption (Т1) of the hydrocarbons C₃₊ , dividing it at this stage into the fed for liquefaction (Е2, ЕЗ) С_2- - rich fraction (3) and into the first condensate fraction (8). The fed for liquefaction C_2-- rich fraction (3) is compressed (V) before its liquefaction (Е2, ЕЗ). The first condensate fraction (8) in the heated up (E) state is fed to the stage of the topping (Т2) of the hydrocarbons С₂. In the capacity of the vat residue formed at the stage of the topping (Т2) of the hydrocarbons С₂, they receive with the high yield the second fraction, С₃₊ - the rich condensate fraction (11). In the capacity of the head faction formed at the stage of the topping (Т2) of hydrocarbons С₂, take out C_3- - rich gaseous fraction, which is partially condensed (E), and the received condensate is fed (10) into the stage of absorption (Т1) of the hydrocarbons С₃ as the absorbing agent. Usage of the invention will allow to ensure along with the liquefaction of the stream of the natural gas simultaneously to receive together with the rich yield of hydrocarbons С₃₊ - rich fraction.

EFFECT: the invention ensures along with the liquefaction of the stream of the natural gas simultaneous production of the rich yield of hydrocarbons С₃₊ - rich fraction.

9 cl, 2 dwg