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S Suprihatin
Chemical Enggineering Department, Faculty Of Engineering, Universitas Pembangunan Nasional “Veteran” Surabaya, East Java, Indonesia
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KINETICS STUDY OF AMMONIUM SULFATE FORMATION FROM BLEACHING EARTH INDUSTRIAL WASTEWATER USING AMMONIUM HYDROXIDE Yusup Fatkhul Mu’is; Andi Safira Larasati Syamhari; Caecilia Pujiastuti; Silvana Dwi Nurherdiana; Suprihatin Suprihatin
JURNAL INTEGRASI PROSES Vol 15, No 1 (2026)
Publisher : JURNAL INTEGRASI PROSES

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62870/jip.v15i1.39320

Abstract

The increasing generation of sulfuric acid-rich liquid waste from bleaching earth activation poses significant environmental concerns due to its high acidity and potential ecological impact. This study presents a kinetic analysis of ammonium sulfate formation from bleaching earth waste, which has not been widely reported, particularly regarding the determination of reaction orders and activation energy. The reaction was carried out by neutralization with ammonium hydroxide, with no variation in reactant concentration. Experiments were conducted by varying the reaction time (5–25 minutes) and temperature (30–70 °C) to evaluate their effects on the reaction rate. Kinetic analysis was performed by testing zero-, first-, and second-order models using linear regression in Microsoft Excel. The results indicate that the first-order model best represents the experimental data, with R² values ranging from 0.97 to 0.99. The Arrhenius plot of ln k versus 1/T showed a linear relationship with R² = 0.9826, yielding an activation energy (Ea) of 10.611 kJ/mol. The rate constant (k) increased with temperature, confirming the temperature dependence of the reaction. The maximum sulfuric acid conversion achieved was 94.54% at 70 °C and 25 minutes. These findings demonstrate that the developed kinetic model provides a reliable basis for reactor design and process scale-up. The results highlight the potential of converting sulfuric acid waste into value-added ammonium sulfate, contributing to sustainable and economically viable waste management practices.
Co-Authors Adinda Putri Cahyani Adji, Nafisa Tera Lintang Alia Febrianti Muliina Alif Julian Andi Safira Larasati Syamhari AR Yelvia Bambang Wahyudi Wahyudi Caecilia Pujiastuti Caecilia Pujiastuti Caecillia P udjiastuti Dona Avrilia Kristanti Dwi Ayu Febrianti Erwan Adi Saputro Fidela Lathifa Haryati Halim, Muhammad Dani Ika Nawang Puspitawati Ima Putriana Karangan, Adam Ketut Sumada Kindriari Nurma Wahyusi Krisna Kumara Dewa L Edahwati Labib, Ahmad Nauval Lucytasari, Silvia Dyah Meiska Dyah Meutia Familya Mohamad Nabhan Putra Redian Mohammad Iqbal Mr. Sutiyono Muhammad Fikri Muhammad Hilmi Marzuqi Muhimatur Rosida Muliawan, Alvin Rizky Mutasim Billah Nana Roudlotul Fitri Nandini , Atika Novel Karaman Nur Aini Fauziyah Nur Aini Fauziyah Nurul Widji Triana Puspa Prima Andini Putri Sinta Dewi Sinaga Ramjani, Muhammad Rifki Retno Dewati Sani Selvia Sofi Yanti Septiyafani, Ayu Silvana Dwi Nurherdiana Silviana Ariana Sintha Soraya Santi Siswati, Nana Dyah Sri Muljani SRIE MULJANI Suprianti, Lilik Susilowati Susilowati Trianna, Nurul Widji Yusup Fatkhul Mu’is