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All Journal CHEMICA Jurnal Teknik Kimia Communications in Science and Technology
Ur Rahmah, Anisa
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Chemical Engineering, Chemistry & Bioengineering Energy Engineering

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Glycerol Acetylation: Effect of Graphene Oxide Catalyst Mass Percentage on Glycerol Conversion and Acetin Selectivity Hidayati, Nur; Prasetyo, Eggy Juan; Brilianti, Wahyu Annisa Mega; Purnama, Herry; Musthofa, Malik; Ur Rahmah, Anisa
CHEMICA: Jurnal Teknik Kimia Vol. 10 No. 2 (2023): August 2023 [Available online since October 02, 2023]
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v10i2.25909

Abstract

Glycerol, a byproduct of the transesterification reaction has a wide range of applications. Acetylation is a promising method for converting surplus glycerol into mono-, di-, and tri-acetin, which is used in the cosmetic, pharmaceutical, polymer, and fuel additive sectors. The kind of catalyst and reaction conditions influence glycerol conversion and acetylation selectivity. Acetylation of glycerol was performed in this study by reacting acetic acid and glycerol with a graphene oxide catalyst produced using the Hummers method. The amount of graphene oxide catalyst (3%, 5%, and 7%) in the reaction mixture was adjusted to see how it affected glycerol conversion and reaction product selectivity. Other variables such as the glycerol:acetic acid mole ratio of 1:9, reaction temperature of 120oC, stirring speed of 1000 rpm, and reaction time of 120 minutes were held constant. Glycerol conversion improves with increasing catalyst mass in the reaction mixture, with the highest conversion (92.1%) achieved when employing a 7% catalyst mass, with its selectivity to monoacetin, diacetin, and triacetin being 70.2%, 4.2%, and 25.6%, respectively.
Green Polyols from Tamanu Seed Oil: Reaction Kinetics and Process Optimization Budiyati, Eni; Habibburohman, Mohammad Sofyan; Fauzi, Nur Ahmad; Wasi, Muhammad Azim; Musthofa, Malik; Ur rahmah, Anisa
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1749

Abstract

Using methanol, this study examined the hydroxylation process of epoxidized tamanu seed oil (ETSO), with an oxirane number of 3.92 to 4.04 mmol/g, under the catalyzation of sulfuric acid (H2SO4). The objectives of this study were, first, to synthesize polyol from ETSO, and, second, determine how temperature and catalyst concentration play a role in the hydroxylation process. During the experiment, a second-order reaction kinetic model was used for analysis. The hydroxylation process was conducted in a batch reactor for 4 hours under constant temperatures and stirring speed. During the experiment, the samples were taken every 30 minutes. The oxirane number of ETSO and the concentration of polyols were used to the reaction rates. The optimal conditions were found at a temperature of 65°C, with a methanol-to-epoxide mole ratio of 4:1 and a catalyst concentration of 3%. The pre-exponential factor (A) and the calculated activation energy (Ea) were found to be 59,041.74 g.mmol-1.min-1 and 44.69 kJ/mol, respectively. This research, therefore, has successfully identified the optimal conditions for the synthesis of bio-based polyols from tamanu oil.
Co-Authors Brilianti, Wahyu Annisa Mega Eni Budiyati Fauzi, Nur Ahmad Habibburohman, Mohammad Sofyan Herry Purnama, Herry Musthofa, Malik Nur Hidayati Prasetyo, Eggy Juan Wasi, Muhammad Azim