System for treating natural gas adapted for operation in offshore platform and method of treatment of natural gas.

摘要

The present invention relates to the treatment of natural gas. In particular, the present invention relates to systems and methods useful for treating natural gas adapted for operation in offshore platform. This is a new system and method for treating natural gas adapted for operation in offshore platform.The system generates a stream of compressed natural gas, dry (20), which is fed to a condensing unit (140).The stream of compressed natural gas, dry (20) is cooled in the heat exchanger (142) of the unit.Expanded through the turboexpansor (144) of the unit to produce a fluid stream of multiple stages so cold that is separated in the separation vessel (146) of the unit in a stream of liquid phase, which contains liquid CO2 and natural gas liquids and a gas stream containing Earlier, methane and CO2.The stream of liquid phase is used as a heat sink for compressed natural gas dried in the heat exchanger (142). The turboexpansor (144) is the only source of active cooling required to produce two currents in the condensing unit.A unit of gas separation membrane (150) separates the gas stream into a stream of retentado enriched in methane and a flow of permeate enriched in carbon dioxide (50L).