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Purification of phosphoric acid in a gravity wash column
Author(s) -
Chen Aimei,
Chen Kui,
Zhu Jiawen,
Wu Bin,
Ji Lijun
Publication year - 2013
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.21757
Subject(s) - phosphoric acid , suspension (topology) , separator (oil production) , impurity , chromatography , crystallization , chemistry , materials science , chemical engineering , thermodynamics , engineering , organic chemistry , mathematics , physics , homotopy , pure mathematics
A gravity wash column is a common type of continuous solid–liquid separator, which can be applied in the final step in the suspension crystallisation process of purifying phosphoric acid. In this work, a mathematical model based on material balance was presented for the purification process in a gravity wash column, and the experimental data of suspension crystallisation of phosphoric acid hemi‐hydrate were correlated. The developed purification model can be used to calculate concentration profiles of impurities along the column axis and to predict the effect of operating conditions on the purity of the product stream of phosphoric acid. The model parameters were also estimated by fitting the model with experimental data. © 2012 Canadian Society for Chemical Engineering