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All Journal IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Journal of Applied Engineering and Technological Science (JAETS) SRIWIJAYA JOURNAL OF ENVIRONMENT Jurnal Locus Penelitian dan Pengabdian
Sri Haryati
Universitas Sriwijaya
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Environmental Science Industrial & Manufacturing Engineering Mathematics Public Health

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Upgrading vacuum residue by swelling of CO2 gas and catalytic cracking process by using Al2O3 catalyst. Aditya Retno Utami; Deby Ansyory; Sri Haryati; Muhammad Djoni Bustan
Sriwijaya Journal of Environment Vol 5, No 2 (2020): NEW ENVIRONMENTAL ISSUES
Publisher : Program Pascasarjana Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (439.885 KB) | DOI: 10.22135/sje.2020.5.2.69-75

Abstract

Vacuum residue is a waste of the production process in the petroleum refining industry. Even though vacuum residue is waste, it still contains hydrocarbon compounds that can be reused as a petroleum derivatives products that have commercial value. Improving the quality of vacuum residue from waste to commercial products is carried out in several stage of the process. In this research, we applied the swelling process as an initial step to weaken and break the long chain carbon of vacuum residue in order to reduce energy consumption. Furthermore, the swelling products will be reprocessed in the catalytic cracking processes to improve the quality and quantity of the product yield. The application of the swelling process can reduce operating conditions temperatures up to 350ºC, and the use of Al2O3 catalyst in the cracking process can produces the product yield that have a good quality after performing the GC-MS analysis test. The content of hydrocarbons in this vacuum residue shows the dominance of aromatic compounds with high octane numbers. The optimum composition of 5%-wt catalyst showed chromatogram composition of 166 compounds with the highest peak at 3.26 retention time owned by toluene with an octane number of 91.
Synthesis and Characterization of CaO-Zeolite Catalyst by Sonochemical Engineering Method Widyarini Widyarini; Muhammad Djoni Bustan; Sri Haryati
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 7, No 3 (2022): October 2022
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v7.i3.113

Abstract

Calcium Oxide (CaO) loaded on zeolite was categorized as a heterogeneous catalyst. The utilization of CaO catalyst could be implemented in catalytic pyrolysis enhance gaseous production. In this paper, CaSO4.2H2O is an active site embedded in natural zeolite, and the activity of the CaO-Zeolite catalyst is synthesized by a sonochemical impregnation-assisted drying process and calcination. The stirrer impregnation method was used as a control. CaO-Zeolite catalyst characterization and properties were identified via Scanning Electron Microscopy- Energy Dispersive X-Ray (SEM-EDX).The activation experiments were performed at an oven temperature of 120oC for 5 h and a calcination temperature of 300oC for 2 h. The synthesized catalysts of sonochemical were performed at 20 minutes, 20 kHz, and 1200 Watt, and the synthesized catalyst of stirrer were performed at 120 minutes, 1500 rpm, and 1000 watts. The experimental results revealed that the characterization of the catalysts prepared by the sonochemical method was better than that of the stirrer. Specifically, obtained CaO-Zeolite catalyst with Ca wt % increased from 0.86 wt% NZ (natural zeolite)  to (11.3 wt%, 14.15 wt% and 23.48 wt%) of sonochemical and (11.82wt%, 13.95 wt% and 20.64wt%) of stirrer. The results demonstrated that Ca wt%  by sonochemical in 20 minutes dispersed at support surface (zeolite)  more effective than stirrer in 120 minutes. These results were impacted by acoustic cavitation and shockwave of ultrasonic on solid-liquid transport and distribution. On the other side, sonochemical assisted the activation technique to minimize particle size and allowed metal oxide (CaSO4.2H2O) to be dispersed uniformly into the pores structure of the zeolite. The utilization of sonochemical in CaO-Zeolite synthesizing enhanced catalyst activity. Keywords: CaO/Zeolite catalyst, Calcination, Drying, Sonochemical Impregnation, Ca weight percentage, Characterization
Triglycerides of Crude Palm Oil to Biokerosene: Studies on Electrolysis and Electromagnetic Effect Sri Rizki Putri Primandari; Krismadinata Krismadinata; Dori Yuvenda; Remon Lapisa; Andre Kurniawan; Mulianti Mulianti; Muhammad Djoni Bustan; Sri Haryati; Gusni Sushanti; Tarig Elshaarani; Yus Donald Chaniago
Journal of Applied Engineering and Technological Science (JAETS) Vol. 5 No. 1 (2023): Journal of Applied Engineering and Technological Science (JAETS)
Publisher : Yayasan Riset dan Pengembangan Intelektual (YRPI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37385/jaets.v5i1.3127

Abstract

Crude Palm Oil (CPO) is a potential feedstock for biokerosene. However, it is problematic when used directly because it is gummy, has a high viscosity and is degradable. Various conversion processes have been conducted that directly convert CPO into biokerosene, but it requires high temperature and pressure. Therefore, as a novelty, this study aims to develop the technology for converting triglycerides into biokerosene under relatively low operating conditions and producing similar petroleum kerosene by electrolysis-assisted and electromagnetic induction. In this study, the conversion technology process was conducted in three steps (i) converting triglycerides to Free Fatty Acids (FFA), (ii) converting FFA to alkanes, and (iii) converting alkanes to biokerosene. Step (ii) is assisted by the electrolysis process, meanwhile, step (iii) is assisted by electromagnetic irradiation. The finding showed that electrolysis obtained 73.47% yield of alkanes and electromagnetic irradiation obtained 78.02% yield of biokerosene.  Biokerosene is almost close to kerosene-based petroleum in terms of colour Saybolt, flash point and Net Heating Value. The findings of this study may provide an alternate technology approach for biokerosene synthesis and solution kerosene scarcity.
Analisis Pemanfaatan Panas Brine Separator untuk Pembangkit Listrik Siklus Rankine Organik (SRO) di PLTP Supreme Energy Rantau Dedap Jantan Manalaoon; Sri Haryati; Budi Santoso
Jurnal Locus Penelitian dan Pengabdian Vol. 5 No. 10 (2026): JURNAL LOCUS: Penelitian dan Pengabdian
Publisher : Riviera Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58344/locus.v5i10.6198

Abstract

Indonesia memiliki potensi energi panas bumi yang sangat besar, namun pemanfaatan panas dari brine keluaran separator PLTP sering belum dioptimalkan dan langsung diinjeksikan kembali ke reservoir. Penelitian ini bertujuan menganalisis potensi pemanfaatan panas brine separator PLTP Supreme Energy Rantau Dedap (SERD) untuk pembangkitan listrik menggunakan sistem Siklus Rankine Organik (SRO). Simulasi dan optimasi dilakukan menggunakan perangkat lunak Engineering Equation Solver (EES) dengan memvariasikan empat jenis fluida kerja (R123, R245fa, isobutana, dan n-pentana), laju alir massa fluida kerja, serta tekanan keluaran turbin, dengan batasan Pinch Point Temperature (TPP) minimum sebesar 5°C sebagai constraint desain heat exchanger. Hasil penelitian menunjukkan bahwa sistem SRO berpotensi menghasilkan daya listrik bersih optimum sebesar 2,832 MW dengan produksi energi listrik tahunan sebesar 22.327.488 kWh/tahun. Pemilihan fluida kerja terbukti berpengaruh signifikan terhadap performa sistem, di mana R123 menghasilkan daya listrik bersih dan efisiensi termal tertinggi (12,97%) dibandingkan tiga fluida kerja lainnya. Laju alir massa optimum diperoleh saat TPP mencapai batas minimum 5°C, sedangkan tekanan outlet turbin optimum diperoleh pada 100 kPa. Analisis keekonomian menunjukkan sistem SRO ini layak dikembangkan, dengan NPV sebesar USD 8.946.897, IRR sebesar 18%, Discounted Payback Period 6,46 tahun, dan LCOE sebesar USD 0,072/kWh yang lebih rendah dibandingkan nilai PPA sebesar USD 0,115/kWh. Penelitian ini memberikan rekomendasi teknis dan ekonomis bagi pengembangan pembangkit SRO berbasis brine panas bumi di Indonesia.
Co-Authors Aditya Retno Utami Andre Kurniawan Deby Ansyory Dori Yuvenda Gusni Sushanti Jantan Manalaoon Krismadinata Krismadinata, Krismadinata Muhammad Djoni Bustan Mulianti Remon Lapisa Santoso, Budi Sri Rizki Putri Primandari Tarig Elshaarani Widyarini Widyarini Yus Donald Chaniago