Method of Recovering Aqueous N-methylmorpholine-N-Oxide Solution Used in Production of Lyocell Fiber
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United States of America Patent
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Issued Date -
Sep 22, 2011
app pub date -
Jun 18, 2010
filing date -
Mar 16, 2010
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Abandoned
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Abstract
A method of recovering an aqueous N-methylmorpholine-N-oxide (NMMO) solution used in production of Lyocell fiber includes: decoloring the aqueous NMMO solution by mixing the same with activated carbon using an agitation blower and by alternately energizing and de-energizing the agitation blower to contact the activated carbon with the aqueous NMMO solution thoroughly in an energy-efficient manner; filtering the aqueous NMMO solution which has been decolored through coarse filtration followed by ultrafiltration to remove the activated carbon and impurities from the aqueous NMMO solution; and concentrating the aqueous NMMO solution which has been filtered using one of a mechanical vapor recompression evaporator and a triple effect evaporator to remove water from the aqueous NMMO solution.
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