Mechanism and inhibition of trisodium phosphate particle caking: Effect of particle shape and solubility--颗粒学报PARTICUOLOGY

Chen, M., Lin, L., Zhang, Y., Wu, S., Liu, E., Wang, K., . . . Gong, J. (2016). Mechanism and inhibition of trisodium phosphate particle caking: Effect of particle shape and solubility. Particuology, 27, 115-121. https://doi.org/10.1016/j.partic.2015.04.005

Mechanism and inhibition of trisodium phosphate particle caking: Effect of particle shape and solubility

Mingyang Chen ^a, Lanlan Lin^a, Yuqi Zhang ^a, Songgu Wu ^a, Ergang Liu ^a, Kun Wang ^a, Jingkang Wang ^{a b c}, Junbo Gong ^{a b c *}

a School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
b Key Laboratory Modern Drug Delivery and High Efficiency in Tianjin University, Tianjin 300072, China
c The Co-Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, China

10.1016/j.partic.2015.04.005

Volume 27, August 2016, Pages 115-121

Received 24 March 2015, Revised 14 April 2015, Accepted 17 April 2015, Available online 18 November 2015, Version of Record 14 June 2016.

E-mail: Junbo_gong@tju.edu.cn

Highlights

• Particles shape and solubility were studied for caking mechanism.

• The research based on theories of adhesion free energy and crystal bridge.

• Relationship between caking ratio and adhesion free energy was studied.

• Caking could be inhibited by screening rinsing liquids, and optimizing particle shape and size.

Abstract

We investigated the influence of particle shape and solubility on the caking behavior of trisodium phosphate by considering the adhesion free energy and crystal bridge theory. Caking of trisodium phosphate during the drying process under static conditions is a two-step process: adhesion followed by crystal bridge formation between particles. The adhesion free energy plays an important role in adhesion. Trisodium phosphate particles cannot adhere to each other and cake when the adhesion free energy is greater than a critical value, which varies with particle shape. Compared with granular particles, cylindrical particles have larger contact area between particles, which results in more crystal bridges forming and a higher caking ratio. Thus, the critical value is about 100 mJ/m² for cylindrical particles, but 60 mJ/m² for granular particles at 25 °C. Concerning the solubility, when particles are similar shapes and soluble in the rinsing liquid, the caking ratio has a linear relationship with adhesion free energy. However, if the particles are insoluble in the rinsing liquid, caking can be completely prevented regardless of adhesion free energy because no crystal bridges form during the growth process. Hence, caking of trisodium phosphate particles could be inhibited by screening rinsing liquids, and optimizing the particle shape and size distribution.

Graphical abstract

Keywords

DLVO; Derjaguin–Landau–Verwey–Overbeek

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