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All Journal Reaktor CHEMICA Jurnal Teknik Kimia Eksergi: Chemical Engineering Journal Journal of Engineering and Technological Sciences DINTEK Chemistry Indonesian Journal of Chemical Research Jurnal Rekayasa Proses
I Dewa Gede Arsa Putrawan
Institut Teknologi Bandung
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Statistical Evaluation of Non-Agglomerating Coating for Granulated Natural Asphalt Samadhi, Tjokorde Walmiki; Putrawan, I Dewa Gede Arsa; Prabowo, Bambang Eko; Dwitawidi, Alinda
Journal of Engineering and Technological Sciences Vol 43, No 1 (2011)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (586.67 KB) | DOI: 10.5614/itbj.eng.sci.2011.43.1.4

Abstract

Agglomeration of granulated Buton natural asphalt during storage is of major concern in its large-scale commercial application. This work develops a simple test method to evaluate the performance of agglomeration-resistant coating for granulated Buton asphalt, consisting of water-based polymeric primary coating and mineral-based secondary coating. The method uses a static load cell to measure the agglomerated granule count fraction under simulated storage conditions. A 24-1 fractional factorial experiment with two replications is employed to evaluate the effect of coating drying temperature, drying time, asphalt to secondary coating mass ratio, and secondary coating type on the agglomerated count fraction at ambient temperature and 60 oC. The test is able to measure a statistically significant increase in agglomeration resistance when the coating is applied, with an agglomerated fraction of 17.5% at 60 oC. The test identifies asphalt to secondary coating weight ratio as a significant factor, with an ANOVA p-value much lower than other effects. A decrease in this mass ratio from 5:1 to 5:2 increases the agglomeration, which is hypothesized to be attributed to the hydrated cementitious phase between granular external surfaces. More work is needed to identify the acceptable fraction of agglomerated granules.
Ekstraksi Asam Lemak Bebas dari Minyak Dedak Padi Menggunakan Etanol-Air dalam Tangki Pengaduk I Dewa Gede Arsa Putrawan; Rizkyanto Nugroho; Reza Anggara
Reaktor Volume 17 No. 3 September 2017
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (338.045 KB) | DOI: 10.14710/reaktor.17.3.166-176

Abstract

Abstract EXTRACTION OF FREE FATTY ACID FROM RICE BRAN OIL USING ETHANOL-WATER IN A STIRRED TANK. This research was aimed to study the extraction of free fatty acid (FFA) from rice bran oil (RBO) in a stirred tank. Fatty acid mixtures derived from RBO were used as FFAs and aqueous ethanol as solvent. First, the distribution coefficients of FFAs were measured through equilibrium experiments. The experiments were carried at 25°C with ethanol concentration in the solvent and FFA concentration in RBO in the ranges of 85-95%-w and 10-30%-w, respectively. In general, the distribution coefficient of FFA was linearly dependent on ethanol concentration. A constant distribution coefficient of 0.9 for FFA RBO, however, is a fairly acceptable assumption with a deviation range of 20-30%. In addition, FFA mixtures in RBO could be represented by a pseudo-component. Extraction experiments were proposed to measure the mass transfer coefficient of FFA, with experimental variations including solvent to feed ratio, ethanol concentration in the solvent, stirring rate, and FFA concentration in RBO. The mass transfer coefficient was in the range of (0.5-1.9)10-3 kg·m-2·s-1. Increasing solvent to feed ratio, ethanol concentration in the solvent, stirring rate, or FFA concentration in RBO increased mass transfer coefficient. The mass transfer coefficient data could be correlated well using the dimensionless equation of Skelland-Xien. Keywords: free fatty acid; extraction; rice bran oil; stirred tank  Abstract Penelitian ini diarahkan untuk mengkaji ekstraksi asam lemak bebas (ALB) dari minyak dedak padi (MDP) dalam sebuah tangki pengaduk. Campuran asam lemak yang diturunkan dari MDP (ALB MDP) digunakan sebagai ALB dan etanol-air sebagai pelarut. Pertama, koefisien distribusi ALB diukur melalui percobaan kesetimbangan. Percobaan dilakukan pada temperatur 25°C dengan konsentrasi etanol dalam pelarut dan konsentrasi ALB dalam MDP masing-masing pada rentang 85-95%-berat dan 10-30%-berat. Secara umum, koefisien distribusi ALB terhubungkan secara linier dengan konsentrasi etanol. Walaupun demikian, koefisien distribusi ALB MDP tetap sebesar 0,9 merupakan asumsi yang cukup dapat diterima dengan rentang galat 20-30%. Tambahan pula, ALB MDP dapat digambarkan sebagai komponen semu. Percobaan ekstraksi diarahkan untuk mengukur koefisien perpindahan massa ALB, dengan variasi percobaan meliputi rasio pelarut terhadap umpan, konsentrasi etanol dalam pelarut, laju putaran pengaduk, dan konsentrasi ALB dalam MDP. Koefisien perpindahan massa yang diperoleh berada pada rentang (0,5-1,9)10-3 kg·m-2·s-1. Kenaikan rasio pelarut terhadap umpan, konsentrasi etanol dalam pelarut, laju putaran pengaduk, atau konsentrasi ALB dalam MDP meningkatkan koefisien perpindahan ALB. Data koefisien perpindahan massa dapat dikorelasikan dengan baik menggunakan persamaan tak berdimensi dari Skelland-Xien. Kata kunci: asam lemak bebas; ekstraksi; minyak dedak padi; tangki pengaduk
Comparative Study of Grinding Machines Processes on Laboratory Scale and Production Scale in the Printing Ink Industry Khanif Eko Prasetyo; I Dewa Gede Arsa Putrawan
CHEMICA: Jurnal Teknik Kimia Vol 7, No 1 (2020): Juni 2020
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26555/chemica.v7i1.13369

Abstract

Grinding is a common process in the ink industry. This process is required to achieve a particular particle size based on specifications. To achieve an optimal condition in grinding, exploration processes are needed. However, an exploration that commenced in the production scale will require a lot of energy and resources. This research objective is to build mathematical modeling and correlate processes of laboratory and production scale grinding. The modeled result which developed in a laboratory scale is expected to be implemented on a production scale, thus exploration processes can be commenced on a laboratory scale with minimal cost. Mathematical modeling is simulated in Matlab®, while population balance is the bases of calculation. This research found that simulation can represent observation data. A correlation also formulated to predict the production scale grinding from laboratory scale evaluation.
Sintesis Dimerkaptoetil Adipat sebagai Bahan Baku Stabiliser Termal Polivinil Klorida berbasis Timah Organik Ester Balik Putrawan, I Dewa Gede Arsa; Natan, Nikanor; Syakuron, Rizal Abdan
Indonesian Journal of Chemical Research Vol 8 No 2 (2020): Edition for September
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-dwp

Abstract

This research aimed to study the synthesis of dimercaptoethyl adipate as raw materials for polyvinyl chloride thermal stabilizer from mercaptoethanol and adipic acid in a batch reactor in which water as a side product was removed by azeotropic evaporation. The study was done through comparative experimental tests where the factors studied included entrainer, mercaptoethanol excess, and reactor volume. It was found that the products obtained were liquid at room condition having clarity in the 95%-99% range, sulfhydryl content in the 23.3%-24.3% range, and yield in the 83.7%-92.1% range. Clarities, sulfhydryl contents, and yields at 20% and 40% mercaptoethanol excesses were not significantly different. At 1 L and 5 L reactor volumes, sulfhydryl contents were found to be significantly different but clarities and yields were not significantly different. Both n-hexane and cyclohexane could be used as entrainers to remove water in the synthesis of dimercaptoethyl adipate. Both entrainers gave clarities and yields that are not significantly different. n-hexane resulted in sulfhydryl content which was 0.77% higher than that of cyclohexane. However, bearing in mind health factors, cyclohexane is considered to be better than n-hexane.
Analisis tekno-ekonomi proses pemisahan fraksi jenuh dan fraksi tak jenuh dari distilat asam lemak sawit Halim, Fadhli; Indarto, Antonius; Putrawan, I Dewa Gede Arsa
Jurnal Rekayasa Proses Vol 19 No 1 (2025): Volume 19, Number 1, 2025
Publisher : Jurnal Rekayasa Proses

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.16251

Abstract

Palm fatty acid distillate (PFAD) can be used as a raw material for two types of polyvinyl chloride (PVC) thermal stabilizers: organotin and mixed organometal. To produce high-quality thermal stabilizers, PFAD must first be separated into saturated and unsaturated fractions. This research aims to develop and analyze the techno-economics of separating these fractions from PFAD through solvent crystallization using methanol. The study began with the development of a process flow diagram, including the selection of unit operations and equipment. Mass and energy balances for the developed process were then calculated. Investment and production costs were estimated and used to determine economic indicators. These calculations were performed using Aspen Plus and Aspen Hysys software. Utility requirements were primarily driven by solvent evaporation and condensation. From an environmental perspective, higher crystallization temperatures are preferable due to reduced fuel consumption and lower CO2 emissions. However, higher crystallization temperatures resulted in a less pure unsaturated fraction, despite producing a larger quantity. The estimated investment for constructing a separation plant with the studied capacity and crystallization temperature range was between 13.6 and 13.9 million USD. Among the equipment, fired heaters and refrigeration compressors contribute the most to costs. The separation process at temperatures of -15°C and 0°C was found to be economically viable, with internal rates of return (IRR) of 36% and 49%, respectively. In contrast, the separation process at 10°C was not economically feasible. The findings of this study are expected to serve as a reference for the development of commercial-scale processes.
PEMISAHAN ASAM-ASAM LEMAK JENUH DAN TAK JENUH (SEPARATION OF SATURATED AND UNSATURATED FATTY ACIDS): 1)Fakultas Teknologi Industri, Institut Teknologi Bandung, Bandung 2)Fakultas Teknik, Universitas Muhammadiyah Maluku Utara, Ternate Rahmah, Azzah Sri; Putrawan, I Dewa Gede Arsa; Candradewi, I Dewa Ayu; Agustias, Nuke Lydia; Nugraha, Wemvy; Salahu, Husaen
DINTEK Vol. 18 No. 01 (2025): Volume 18 No.1, Maret 2025
Publisher : Fakultas Teknik UMMU

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

Abstract

bstrak: Asam lemak merupakan bahan baku penting untuk berbagai produk, seperti bahan bakar, perasa, pewangi, plastiser, stabiliser termal, sabun, kosmetik, pengemulsi, pelumas, pelapis, dan resin. Asam lemak diperoleh melalui hidrolisis minyak nabati dan lemak hewani, menghasilkan campuran asam lemak jenuh dan tak jenuh. Untuk memperoleh asam lemak dengan tingkat kejenuhan yang diinginkan, campuran asam lemak perlu dipisahkan. Berbagai metode pemisahan asam lemak jenuh dari asam lemak tak jenuh telah tersedia. Metode-metode tersebut meliputi kristalisasi biasa, distilasi, kristalisasi pelarut, kompleksasi urea, hidrofilisasi, ekstraksi superkritik, dan pemisahan membran. Meskipun masing-masing metode memiliki keterbatasan, kristalisasi biasa dan distilasi tetap banyak digunakan dalam skala komersial. Hidrofilisasi dan kristalisasi pelarut juga telah menemukan aplikasi komersial. Sementara itu, metode lain seperti kompleksasi urea, ekstraksi superkritik, dan pemisahan membran masih dalam tahap penelitian dan pengembangan. Tantangan seperti volume air limbah dalam jumlah besar, biaya investasi yang tinggi, atau keterbatasan data perancangan saat ini masih menghambat aplikasi komersial skala besar.
Mix Metal Thermal Stabilizer from Palm Fatty Acid Distillate Octavia, Yona; Putrawan, I Dewa Gede Arsa
Eksergi Vol 22 No 1 (2025)
Publisher : Prodi Teknik Kimia, Fakultas Teknik Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/eksergi.v22i1.12656

Abstract

Polyvinyl chloride (PVC) is a widely utilized material across various fields; however, it is prone to thermal degradation, even at temperatures as low as 70°C. To enhance its thermal stability, the addition of thermal stabilizers is essential. Mixed metal stabilizers are among the most environmentally friendly and effective options, composed of carboxylate acids and a combination of alkaline earth and transition metals. This study aims to synthesize a Ca/Zn-based mixed metal stabilizer using Palm Fatty Acid Distillate (PFAD), a locally available raw material with significant potential as a source of carboxylate acid. The synthesized stabilizer, termed "Ca/Zn palmat," utilizes calcium (Ca) and zinc (Zn), chosen for their non-toxic properties. FTIR analysis confirmed the successful formation of Ca/Zn carboxylate groups from PFAD. The optimal Ca:Zn ratio was determined to be 4:1, providing a PVC stability time of approximately 15 minutes based on the Congo red test. The ideal stabilizer dosage was found to be 7 phr (parts per hundred resin). Furthermore, the addition of pentaerythritol as a co-stabilizer demonstrated a synergistic effect, significantly enhancing the thermal stability of PVC
Co-Authors Agustias, Nuke Lydia Alinda Dwitawidi Bambang Eko Prabowo Candradewi, I Dewa Ayu Halim, Fadhli Indarto, Antonius Khanif Eko Prasetyo Natan, Nikanor Nugraha, Wemvy Rahmah, Azzah Sri Reza Anggara Rizkyanto Nugroho Salahu, Husaen Syakuron, Rizal Abdan Tjokorde Walmiki Samadhi