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A Mathematic Model for Direct Causticization of Na 2 CO 3 with TiO 2 in a Semi‐batch Reactor
Author(s) -
Zeng Le,
Van Heiningen Adriaan R. P.
Publication year - 2002
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450800518
Subject(s) - fluidized bed , sodium carbonate , yield (engineering) , diffusion , batch reactor , materials science , carbonate , batch processing , constant (computer programming) , thermodynamics , chemical engineering , chemistry , sodium , metallurgy , engineering , computer science , physics , catalysis , biochemistry , programming language
A mathematic model was developed for direct causticization of sodium carbonate with titanium dioxide in a semi‐batch reactor. The model predictions of the titanate yield and pentatitanate yield showed a reasonable agreement with the experimental data from a pilot‐scale fluidized bed operating in semi‐batch mode. The rate constant of the present model was generally consistent with those obtained from the small‐scale batch experiments in the literature. A new rate constant considering carbonate conversion to pentatitanate was introduced. All the results provided support that the solid‐state direct causticization of sodium carbonate with titanium dioxide in a semi‐batch fluidized bed follows the shrinking‐core diffusion model.