Question

Name 3 different technologies utilized for NGL recovery at an LNG plant.

Accepted Answer

Three different technologies utilized for NGL (Natural Gas Liquids) recovery at an LNG plant are: 1) Cryogenic Distillation: This process uses low-temperature separation to condense and separate NGLs from the natural gas stream. The gas is cooled to cryogenic temperatures, causing the NGLs (ethane, propane, butane, etc.) to condense into a liquid phase, while methane remains in the gas phase. These liquids are then separated via distillation columns. 2) Absorption: In this method, a lean oil (typically a heavier hydrocarbon liquid) is used to absorb the NGLs from the natural gas stream. The rich oil, now containing the absorbed NGLs, is then sent to a stripping column where the NGLs are separated from the oil by heating. The lean oil is then recycled back to the absorber. 3) Joule-Thomson Expansion: This involves expanding the natural gas stream through a valve or expander, causing a pressure drop and a corresponding temperature drop due to the Joule-Thomson effect. The cooling effect causes some of the NGLs to condense, which can then be separated from the gas stream. This method is typically used for smaller-scale NGL recovery or as a pre-cooling step in conjunction with other NGL recovery technologies.

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Name 3 different technologies utilized for NGL recovery at an LNG plant.