FIELD: gas processing, particular, processes for separation of fraction C2+B from natural gas. SUBSTANCE: method for separation of fraction of hydrocarbons C2+B from natural gas includes two stages of cooling of compressed natural gas, separation of gas-liquid flow after the second cooling stage into the liquid phase for rectification, and gas phase subjected to throttling, and then, rectification and throttling of the main product of the rectification stage in which, to increase the output of the desired product, the first stage of cooling is conducted up to 234 K. Obtained gas-liquid flow is separated into liquid phase fed after throttling for rectification, and gas phase which is supplied to the second cooling stage at temperature of 214 K. Throttling of the main product of rectification is conducted after its heat exchange with compressed natural gas at the first cooling stage with subsequent repeated passing it through this stage. EFFECT: higher efficiency.
