Purification of phosphoric acid in a gravity wash column

Authors

  • Aimei Chen,

    1. Chemical Engineering Research Center, East China University of Science and Technology, Meilong Road 130, 200237 Shanghai, China
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  • Kui Chen,

    Corresponding author
    1. Chemical Engineering Research Center, East China University of Science and Technology, Meilong Road 130, 200237 Shanghai, China
    • Chemical Engineering Research Center, East China University of Science and Technology, Meilong Road 130, 200237 Shanghai, China.
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  • Jiawen Zhu,

    1. Chemical Engineering Research Center, East China University of Science and Technology, Meilong Road 130, 200237 Shanghai, China
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  • Bin Wu,

    1. Chemical Engineering Research Center, East China University of Science and Technology, Meilong Road 130, 200237 Shanghai, China
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  • Lijun Ji

    1. Chemical Engineering Research Center, East China University of Science and Technology, Meilong Road 130, 200237 Shanghai, China
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Abstract

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

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