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Design of a continuous crystallizer by evaporation as unit operation
Author(s) -
Chianese A.,
Fasoli U.,
Prati Gaglia M. P.
Publication year - 1984
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170190707
Subject(s) - nucleation , evaporation , crystallization , variable (mathematics) , residence time (fluid dynamics) , process (computing) , degrees of freedom (physics and chemistry) , unit (ring theory) , crystal growth , variables , thermodynamics , mechanics , mathematics , chemistry , physics , mathematical analysis , computer science , engineering , statistics , mathematics education , geotechnical engineering , operating system
We have examined the continuous crystallization by evaporation as a unit operation, a process which is normally empirically designed and dimensioned. Through the mass balances and process equations (concerning the crystal growth, the secondary nucleation, the crystals dimensional and numeric balances) six equations were obtained upon which the calculation of the operating variables depends. The resulting mathematical system offers two degrees of freedom, and by defining the two independent variables it was possible to calculate — as shown in the graphics — the trends of the other six variables. One of the chosen independent variables was the diameter of the formed nuclei (as this is basically an experimental date), whereas the other was the variable τ which defines the residence time.