Title:
CRYSTAL REFINING APPARATUS
Document Type and Number:
WIPO Patent Application WO/1991/004777
Kind Code:
A1
Abstract:
A crystal refining apparatus of a vertical type, wherein a plurality of screw vanes are provided, the screw vanes have crystal refining tubes rotating in directions opposite to each other, and contained solid crystalline materials are refined and transferred upwardly. The apparatus provides a high reflux ratio of quantity of an impurity-containing separated solution to the flow rate of the solid crystalline materials thus obtaining a highly pure product. Chambers for removing the impurity-containing separated solution are provided for removing the impurity containing separated solution at the bottom ends and/or the sides of the crystal refining tubes, this or these chambers for removing the impurity-containing separated solution have means for connecting the chambers to a depressurized line, thereby offering a high reflux ratio.
Inventors:
SAITOH SHIGERU (JP)
Application Number:
PCT/JP1990/001283
Publication Date:
April 18, 1991
Filing Date:
October 04, 1990
Export Citation:
Assignee:
SAITOH SHIGERU (JP)
International Classes:
B01D9/00; B01D9/02; C30B7/08; (IPC1-7): B01D9/00
Foreign References:
| JPS594401A | 1984-01-11 | |||
| JPS58199002A | 1983-11-19 | |||
| JPS62244402A | 1987-10-24 | |||
| JPS6025504A | 1985-02-08 | |||
| JPS5680202U | 1981-06-29 |
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