Crystal purification

Details Crystal purification Crystal purification

1982-01-04

1983-12-20

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568749, 568755, 585800, 100117, C07C 3784

Patent

active

044219377

ABSTRACT:
Mixtures of crystals and a liquid, ordinarily comprising the mother liquor of the crystals are continuously separated by feeding the mixture into a screw type press having drainage apperatures, thereby subjecting the crystals with the mother liquor entrapped therein to pressures sufficient to substantially reduce the interstitial space between crystals. Reduction of the interstitial space causes the mother liquor to be forced out of the drainage aperatures thus purifying the crystals. This achieves a more effective separation of mother liquor from the crystals than can be achieved by gravity or the use of a device such as a centrifuge and eliminates the need for a foreign solvent to wash the mother liquor from the crystals.

REFERENCES:
patent: 3113161 (1963-12-01), Schmalenbach
patent: 3523799 (1970-04-01), Rigby

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