Process for vapor emission control
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United States of America Patent
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Aug 30, 2016
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N/A
app pub date -
Oct 15, 2014
filing date -
Oct 15, 2014
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Abstract
A vapor emission control system for recovering hydrocarbon vapors displaced as vessels are loading consisting of two stages of carbon adsorption vapor recovery units. The first stage with two or more parallel carbon beds recovers the heavier C4-C6+ hydrocarbons on a first carbon bed which are then removed as a gas via vacuum and then converted into a liquid product via a vapor-to-liquid conversion unit. Lighter C2-C3 hydrocarbon vapor discharged from the first stage is recovered on two or more parallel carbon beds of the second stage. The vapor is then removed via vacuum as a concentrated gas for use as fuel or sent to a flare. The hydrocarbon lean first portion of the off-gas from each vacuum desorption is recycled to the other in-parallel carbon bed. The load and regeneration cycles alternate for the two carbon beds in each of the two stages based on an optimized time cycle.
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