Effect of Additional Concentration of ATMP Inhibitor on The Formation of 40% Phosphoric Acid Scale

Abstract:

Calcium sulfate (CaSO₄) scale formation during the phosphoric acid (H₃PO₄) production process presents significant operational challenges. Key variables influencing scale formation include temperature, pressure, stirring speed, and supersaturation. This study aims to evaluate the effect of varying concentrations of ATMP inhibitors on the mass of CaSO₄ scale in a 40% phosphoric acid solution and to analyze the composition of the resulting scale. The experimental procedure involved the addition of ATMP inhibitors at different concentrations, while temperature and stirring speed were varied. The solution was circulated through a sample housing for two hours, after which the mass of the formed scale was measured, and X-Ray Fluorescence (XRF) analysis was performed. The optimal concentration of ATMP inhibitors was found to be 9 ppm at a temperature of 40°C and a stirring speed of 235 rpm. Results indicated that the composition of the CaSO₄ scale produced with ATMP inhibitors was significantly lower than that of samples without inhibitors, with XRF analysis revealing an 8% reduction in CaSO₄ levels

• Periodical: Engineering Chemistry (Volume 10)
• Pages: 43-56
• DOI: https://doi.org/10.4028/p-72XsbZ
• Online since: August 2025
• Authors: Daril Ridho Zuchrillah*, Lily Pudjiastuti, Fatima Az Zahra, Hilmy Dzaky Edo Pratama, Indah Asmaul Chusna, Aulia Zalsabila
• Keywords: ATMP, Phosphoric Acid, Scale

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