Method to produce liquefied natural gas (LNG) at midstream natural gas liquids (NGLs) recovery plants
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United States of America Patent
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Apr 28, 2020
Grant Date -
Jun 20, 2013
app pub date -
Dec 20, 2012
filing date -
Dec 20, 2011
priority date (Note) -
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Abstract
A method for production of liquid natural gas (LNG) at natural gas liquids (NGLs) recovery plants that maximizes NGLs recovery by producing LNG and using the produced LNG as an external cooling source to control the operation of a de-methanizer column at the NLG recovery facility. In at least one embodiment, LNG is added from an LNG overhead receiver by direct mixing to control the temperature profile in the NGL de-methanizer column. The temperature in an overhead product of the de-methanizer column is controlled by controlling addition of LNG as a reflux stream. The temperature in an expanded feed gas to the de-methanizer column is controlled by controlling addition of LNG as a tempering gas, while stripping of carbon dioxide from an NGL product stream is controlled by controlling the addition of LNG as stripping gas.
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