The kinetics of the crystallization of barium chromate in presence of polyphosphate and phosphonates |
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| Authors: | M. N. Ramsis M. S. Antonious E. N. Rizkalla A. O. Youssef |
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| Affiliation: | (1) Chemistry Department, Faculty of Science, Ain Shams University, Abbassia, Cairo, Egypt |
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| Abstract: | Summary The inhibiting effect of polyphosphate and phosphonates on the crystallization of barium chromate for both seeded and unseeded systems has been investigated using the changes in ionic conductivity of the lattice ions in supersaturated solutions containing stoichiometric concentrations of barium and chromate at 298 K. The inhibitors studied are sodium tripolyphosphate (STP), ethylenediaminetetramethylenephosphonic acid (ENTMP), and 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP). The effect of these inhibitors on the growth of crystals has been studied at several inhibitor concentrations. The influence of these additives on barium chromate crystallization could be interpreted in terms of aLangmuir type adsorption isotherm. The crystallization retarding effect due to inhibitors is in the orderHEDP>STP>ENTMP. The inhibitors studied can be used as effective compounds for scale formation control.Deceased |
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| Keywords: | Kinetics Crystallization Barium chromate Inhibitors |
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