Multistage countercurrent recrystallization process and apparatus for performing same
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United States of America Patent
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-
Aug 31, 1993
Grant Date -
N/A
app pub date -
Jan 25, 1991
filing date -
Jan 25, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multistage process for the separation and purification of a desired crystalline material by repeated dissolution and recrystallization, wherein crystals and solvent move countercurrent to one another through the stages. A fluid temperature gradient is maintained within each recrystallization unit to make use of convection to facilitate or accelerate concurrent dissolution and recrystallization within a single vessel. Solid recrystallized material is moved from one unit to the next unit. An automated apparatus and a manually operated apparatus for carrying out the process are also described.
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