PROCESS OF LIQUEFACTION OF GAS FLOW (VARIANTS) Russian patent published in 2004 - IPC

FIELD: production of compressed liquid products. SUBSTANCE: invention describes process of liquefaction of natural gas for production of compressed liquid product with temperature above 112 C with use of two mixed coolants in two closed cycles, one coolant displaying low level of temperature for cooling and liquefaction of natural gas and another coolant with high level of temperature for cooling of coolant displaying low level of temperature. After usage for liquefaction of natural gas coolant with low level of temperature is a) heated by heat exchange in countercurrent flow with another flow of coolant with low level of temperature and by heat exchange with first flow of coolant with high level of temperature, b) compressed to increased pressure and c) overcooled by external cooling medium. Coolant with low level of temperature is then cooled by heat exchange with second flow of coolant with high level of temperature and by heat exchange with coolant displaying low level of temperature. Coolant with high level of temperature is heated by heat exchange with coolant displaying low level of temperature, is compressed to increased pressure and overcooled by external cooling medium. EFFECT: potential for updating of cooling plant producing compressed liquefied natural gas. 6 cl, 1 dwg, 1 tbl