Multistage recrystallization for superpurifying crystallizable substances
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United States of America Patent
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Jul 7, 1992
Issued Date -
N/A
app pub date -
Mar 13, 1991
filing date -
Jul 28, 1988
priority date (Note) -
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Abstract
A method and apparatus are provided for superpurifying crystallizable substances to a purity level of 99.999 percent. Included is controlling the reflux ratio by controlling and/or metering transfers of crystals and mother liquor at selected locations and by maintaining a steady state of transfers between a plurality of stages that carry out similar operations.
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