Synthesis of PCC by Carbonation of Waste Calcium Chloride Solution via Gas-Liquid Reaction

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IJEP 44(5): 454-464 : Vol. 44 Issue. 5 (May 2024)

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Prashant Shrivastava1*, Rajeev Singh2 and Susanta Kumar Jana3

1. Institute of Technology and Management, Department of Chemical Engineering, Gwalior – 475 001, Madhya Pradesh, India
2. Institute of Technology and Management, Department of Chemistry, Gwalior – 475 001, Madhya Pradesh, India
3. Malviya National Institute of Technology, Department of Chemical Engineering, Jaipur – 302 017, Rajasthan, India

Abstract

A bubbling reactor was employed to synthesize precipitated calcium carbonate (PCC) by carbonating CaCl2, considering the huge discharge of its waste solution from different industries. The maximum conversion of CaCl2 obtained was about 99% and was found to increase with an increase in the superficial gas velocity and CO2 concentration in the feed gas. However, it decreased with an increase in the concentration of CaCl2 in the feed solution. The products were characterized by XRD, SEM and FTIR analyses. In the lower range of superficial gas velocity and CO2 concentration, uniform rhombohedral calcite particles were obtained, while at higher values of these variables, irregular fractured PCC was formed. The average size of product particles was found to be about 2-3 µm. Limitations of synthesis of PCC with the use of a micro-porous gas distributor or by merely mixing the distiller waste with residual mother liquor generated in a soda-ash plant, were also systematically evaluated.

Keywords

Waste calcium chloride solution, Bubbling reactor, Carbonation, Precipitated calcium carbonate, Calcite

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