Rectification of natural gas

Details Rectification of natural gas Rectification of natural gas

F - Mech Eng,Light,Heat,Weapons

25

J

162/113

F25J 3/00 (2006.01)

Patent

CA 1106751

ABSTRACT OF THE DISCLOSURE An improvement is provided in a process for separating a C2+-hydrocarbon fraction from compressed CO2-containing natural gas by rectification, wherein the compressed natural gas is, prior to rectification, subjected to partial conden- sation and engine-expansion steps to achieve the desired pres- sure and temperature conditions in the rectification column, and wherein the column is fed by resultant condensate of natural gas. The improvement includes the step of conducting the engine expansion of the natural gas to a point well above the temperature at which the CO2 would otherwise precipitate out, and recovering, from the engine-expansion step an unliquefied gaseous fraction; then passing that fraction in indirect heat exchange realtionship with engine-expanded overhead product from the column; and then feeding resultant partially condensed fraction to the top of the column. In consequence of these steps, and particularly the second step, peak cooling and partial condensation of the fraction is achieved.

339812

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