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An engineering study of the rotary drum crystallizer
Author(s) -
Chaty John C.,
O'Hern Harold A.
Publication year - 1964
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690100124
Subject(s) - drum , impurity , chemistry , coolant , naphthalene , xylene , volume (thermodynamics) , rotational speed , subcooling , benzoic acid , chromatography , analytical chemistry (journal) , materials science , chemical engineering , thermodynamics , organic chemistry , boiling , mechanical engineering , physics , engineering , benzene
In the rotary drum crystallizer, solids are deposited from a molten liquid mixture on the cooled surface of a drum. Rotation of the drum carries the solids from the melt to a scraper blade which removes the crystal deposit in a liquid free, convenient form. The object of this investigation was to obtain data on the separation of binary mixtures over a range of melt temperature, drum coolant temperature, drum rotational rate, concentration of impurity in the liquid, and agitation of the liquid. Four systems were studied: naphthalene‐benzoic acid, beta‐naphthol‐naphthalene, p ‐xylene‐ m ‐xylene, water‐sodium chloride. The experimental results show that separation improved with increasing agitation, increasing coolant temperature, decreasing drum speed, and decreasing liquid impurity. For the naphthalene‐benzoic acid system, the major system studied, the maximum stage efficiency was 96%. The results indicate that the vigor of agitation and the drum coolant temperature are the two most important variables which affect the separation. It was possible to calculate the rate of solid deposition with heat transfer data. The rotary drum crystallizer appears to be an effective device for industrial separation of organic chemicals.