MODE OF LIQUEFACTION OF NATURAL GAS BY WAY OF COOLING AT THE EXPENSE OF EXPANSION Russian patent published in 2005 - IPC

FIELD: the invention refers to the mode of liquefaction of a flow of compressed gas rich in methane.

SUBSTANCE: at the first stage of the process the first fraction of the flow of the compressed fed gas is set aside preferably at the pressure more than 11000 kPa and its entropic expansion until to more lower pressure is made for cooling and at least to partial liquefaction of the set aside first fraction. The multistep expansion of the second fraction is made until to more lower pressure. At that at least partially the second fraction of the gas flow is liquefied. The liquefied second fraction is removed out of the process as a flow of compressed air at the temperature of more than -112°C and the pressure equal to the pressure at the point of beginning of boiling and higher.

EFFECT: the invention allows to improve the mode of liquefaction of natural gas.

24 cl, 6 dwg, 1 tbl, 1 ex