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All Journal KOVALEN: Jurnal Riset Kimia JC-T (Journal Cis-Trans): Jurnal Kimia dan Terapannya Jurnal Pengelolaan Laboratorium Pendidikan FLUIDA Fullerene Journal of Chemistry Jurnal Offshore: Oil, Production Facilities, and Renewable Energy Jurnal Teknik Kimia dan Lingkungan Journal of Green Science and Technology
Andrijanto, Eko
Politeknik Negeri Bandung
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Transportation

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Pengaruh Temperatur Kalsinasi Terhadap Kapasitas Ion Katalis Asam Heterogen Berbasis Silika dan Aplikasinya pada Sintesis Metil Oleat: The Effect of Calcination Temperature on the Ion Capacity of Heterogeneous Silica-Based Acid Catalysts and Its Application in the Synthesis of Methyl Oleate Joko Suryadi; Nanda Nabila; Syafa Neiska Bayhaqi; Eko Andrijanto
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 2 (2023): August Edition
Publisher : Chemistry Department, Mathematics and Natural Science Faculty, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/kovalen.2023.v9.i2.16457

Abstract

Sulfated silica catalyst is a solid acid catalyst which in its application is used to accelerate esterification reactions. The purpose of this study was to determine the effect of calcination temperature and increasing the amount of catalyst on the effectiveness of silica as a catalyst in the formation of methyl oleate through esterification reactions. The synthesis of sulfuric acid catalyst from rice husk ash went through several stages, including preparation of raw material for rice husk ash, production of silica using the sol-gel method, manufacture of silica-based acid catalysts and characterization of the sulfated silica catalyst. The acid catalyst was prepared using impregnation method with sulfuric acid and calcined at various temperatures of 500, 600, 700 and 800oC. The characterization of the acid catalyst formed includes ionic capacity, catalyst performance in the esterification reaction, and the determination of the bond characteristic functional groups using FTIR. The results of ion capacity analysis showed that the highest acidity value was found in the sulfated silica catalyst calcined at 600oC of 0.372 mmol/gram. Testing the performance of the catalyst in the esterification reaction with a ratio of 4:1 (methanol:oleic acid) obtained an ester conversion of 38.89% using a catalyst of 30% of the amount of oleic acid. Identification results using FTIR show that sulfate ions have chemically interacted with silica at around 1103.28 cm-1
Utilization of Agricultural Waste Substrates with Inorganic Salt Medium as Nutrient Enhancer for Biosurfactant Production by MEOR-Oriented Bacterial Consortia Nanda Ravenia Amanda; Eko Andrijanto; Bevi Lidya
Jurnal Offshore: Oil, Production Facilities and Renewable Energy Vol. 9 No. 1 (2025): Jurnal Offshore: Oil, Production Facilities and Renewable Energy
Publisher : Universitas Proklamasi 45

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30588/jo.v9i1.2330

Abstract

The decline in oil recovery during secondary processes has led to the exploration of tertiary methods such as Microbial Enhanced Oil Recovery (MEOR). This study investigates biosurfactant production by Pseudomonas aeruginosa and Bacillus subtilis in a co-culture system, optimizing fermentation media and evaluating effectiveness in oil recovery. Seven media were tested based on optical density (OD600), emulsification index (E24), oil displacement area (ODA), and yield of wet crude biosurfactant, observed over five days. The highest E24 value, 89.66% was recorded on day two using used lubricant as the water-immiscible phase. The best ODA values were 44.49 cm² for supernatant (ODA SNT) and 55.86 cm² for wet crude biosurfactant (ODA CBS). The optimized production medium contained 2% (v/v) waste cooking oil, 1% (w/v) molasses, and 1% (v/v) tofu wastewater. Partial purification of the culture broth through acid precipitation and solvent extraction yielded the highest wet crude biosurfactant on day three, reaching 155 g/L. The co-culture system at a 1:1 P/B ratio effectively reduced oil-water interfacial tension, as demonstrated by the high ODA values, particularly in the purified crude biosurfactant. This highlights the eco-friendly potential of biosurfactants for MEOR applications.
Enhancement Of Salt Quality with Recrystallization Method from Crude Salt Raw Material on a Laboratory Scale Joko Suryadi; Saifa Haikal Witcaksono; Putri Widad Salsabila; Eko Andrijanto; Yohana Fransiska Ferawati; Retno Dwi Jayanti; Kardian Rinaldi; Haryadi Haryadi
Journal of Green Science and Technology Vol 9 No 3 (2025): Journal of Green Science and Technology Vol. 9 No. 3 December 2025 Special Editio
Publisher : Faculty of Engineering, Universitas Swadaya Gunung Jati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33603/jgst.v9i3.10609

Abstract

Indonesia has significant maritime potential, particularly in salt production. However, national salt production has not yet met domestic demand, especially for industrial-grade salt, which requires a minimum NaCl content of 97%. Crude salt produced using traditional methods often contains only 88-94% NaCl and includes impurities such as Ca, Mg, and sulfate. This research aims to produce recrystallized salt that meets industrial standards and to determine the optimal conditions in a laboratory-scale simulator. The experimental method was conducted by simulating evaporation on a recrystallization table. Salt solutions were prepared from crude salt with varied concentrations of 22%, 25%, and 30%. The observed parameters included solution density, evaporation rate, and the content of NaCl, total hardness, and sulfate in the salt product. The results showed that recrystallization significantly increased the NaCl content and reduced impurities. Optimal conditions were achieved with a 22% salt solution, where crystal formation produced recrystallized salt with an NaCl content of 99.33%, total hardness of 0.47%, and sulfate content of 8.56 ppm. This quality has the potential to meet industrial salt standards. This study can serve as a reference for industrial salt production on a larger scale.
Co-Authors Ade Rifqi Maulana Alfiana Adhitasari Anindya Indrita Putri Anisa Dwi Febriani Bevi Lidya Dhea Nurul Elizabeth, Lidya Hani Hanifah Haryadi Haryadi Jayanti, Retno Dwi Kardian Rinaldi Mentik Hulupi Nanda Nabila Nanda Ravenia Amanda Oki Putra Paramitha, Tifa Putri Widad Salsabila Raihan Nurfauziah Rispiandi Rispiandi Rusdan Fadila Sabinna Azahra Sulaeman Saifa Haikal Witcaksono Saripudin Saripudin Saripudin Setyaningrum, Sinta Shafira Salsabilla Shafira Yulianthina Sudrajat Harris Abdulloh Suminar, Dian Ratna Suryadi, Joko Syafa Neiska Bayhaqi Yohana Fransiska Ferawati Zulfa Rahmah Fadillah