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Activities in the oil and gas industry have some impacts on environment through flare gas. Flare gas occurs as the combustion products of natural gas are wasted into atmosphere without further and proper treatment. These products increase carbon dioxide (CO2) and greenhouse gas (GHG) emissions which are considered as the biggest contributors to global warming. Indonesia has participated in accelerating the reduction of gas flares in oil and gas activities through the Zero Routine Flaring by 2030 initiated by the World Bank. In 2017, the volume of flare gas in Indonesia was approximately 82 MMSCFD. The object of this study is flare gas in Pertamina RU III Plaju Palembang which has three flare stacks and produces about 0.84 MMSCFD of flare gas . The flare gas, consist of hydrocarbon components (mostly butane, propane and pentane) of high economic value if it is conserved and processed further. Using Gas to Liquid (GTL) method, flare gas can be converted into Liquefied Petroleum Gas (LPG) which is of valuable use domestically. The simulation was performed using ASPEN HYSYS with three distillations and one cooler. Simulation of the separation of LPG from the flare gas unit of the Crude Distillation Gas Plant (CDGP) of 1051 barrel/day can produce propane 34.67 barrel/day, i-butane 148.98 barrel/day and n-butane 159.06 barrel/day.