Adsorption process for recovery of solvents
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United States of America Patent
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Sep 28, 1999
Grant Date -
N/A
app pub date -
May 15, 1998
filing date -
May 15, 1998
priority date (Note) -
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Abstract
Organic solvents are removed from air by adsorption on fixed beds of activated carbon. Each carbon bed is periodically regenerated by heating it in two distinct steps and then by cooling it in two steps with a circulated inert gas stream. During the first step of heating a portion of the water is removed from the inert gas by molecular sieves or preferably by chilling the inert gas to below 10.degree. C. In a second step of heating the essentially water-free liquid solvent is recovered by chilling the inert gas. The first step of cooling of a bed is overlapping with the first step of heating of another bed. The hot gas leaving the cooled bed is used to heat the other bed. Between the two stages of heating the bed is put on 'hold' till the final cooling step of another bed is completed.
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