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All Journal Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir CHEMICA Jurnal Teknik Kimia Teknisia Communications in Science and Technology Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri Prosiding University Research Colloquium Jurnal Sosial dan Sains Manufaktur: Publikasi Sub Rumpun Ilmu Keteknikan Industri
Malik Musthofa
Universitas Muhammadiyah Surakarta
Aerospace Engineering Humanities Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Physics

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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.
Pemanfaatan Limbah Pati Aren sebagai Bahan Alternatif Pembuatan Bioetanol Oktaviani, Anggun; Isnaini, Nur; Putri, Elok Kharisma; Musthofa, Malik
Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri 2025: Prosiding Simposium Nasional Rekayasa Aplikasi Perancangan dan Industri
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Bioetanol merupakan salah satu sumber energi terbarukan yang berpotensi menggantikan bahan bakar fosil sekaligus dapat dimanfaatkan sebagai campuran bensin. Penelitian ini bertujuan memanfaatkan limbah pati aren dari industri mie soun di Desa Daleman, Klaten, sebagai bahan baku produksi bioetanol serta menentukan kadar selulosa, glukosa hasil hidrolisis, dan etanol hasil fermentasi. Limbah pati aren dipreparasi melalui proses delignifikasi menggunakan ayakan 60 mesh dan larutan H2SO4 untuk memecah kandungan lignin. Proses hidrolisis dilakukan dengan variasi waktu 24-120 jam, pH 4-6, dan suhu 35-45°C, sedangkan proses fermentasi dilakukan selama 5, 9, dan 13 hari. Analisis kadar selulosa dan lignin menggunakan metode Chesson-Datta menunjukkan kadar selulosa sebesar 6,786% dan lignin 0,714%. Pengujian glukosa dengan spektrofotometer UV-Vis menghasilkan kadar tertinggi sebesar 82,224% pada kondisi pH 4, suhu 40°C, dan waktu hidrolisis 120 jam. Sementara itu, analisis etanol menggunakan refraktometer menunjukkan kadar tertinggi sebesar 1,3392% dengan volume 7,2 mL pada hari ke-9 fermentasi. Hasil ini menunjukkan bahwa limbah pati aren memiliki potensi sebagai bahan baku produksi bioetanol yang ramah lingkungan dan berkelanjutan.
Co-Authors Agus Haerudin Agus Haerudin, Agus Anisa Ur Rahmah Ayuningtyas, Pratiwi Brilianti, Wahyu Annisa Mega Dewi, Esti Tri Kusuma Eggy Juan Prasetyo Eni Budiyati Fadilla, Nayandra Dias Fauzi, Nur Ahmad Habibburohman, Mohammad Sofyan Herry Purnama Herry Purnama, Herry Hikmat, Moh. Cecep Cepi Ibnu Saputra, Dwi Luhur Jaka Rachmadetin Kalingga, Dwi Tanjung Lalu Makrup Luthfiyah S Fikri Mirawaty, Mirawaty Nur Hidayati Nur Hidayati Nur Isnaini, Nur Oktaviani, Anggun Prasetyo, Eggy Juan Putri, Elok Kharisma Risdiyana Setiawan, Risdiyana Rizky Bellyana Noermitha Rizqi, Muhammad Aliefiana Suharyatmo Ur Rahmah, Anisa Utami, Riska Jati Wahyu Annisa Mega Brilianti Wasi, Muhammad Azim Wisnu Erlangga Wulandari, Adinda Dwi Yuli Purwanto, Yuli