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Sihombing, Rony Pasonang
Jurusan Teknik Kimia, Politeknik Negeri Bandung
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Karakteristik Sifat Fisikokimia Etil Levulinat Sebagai Zat Aditif Bahan Bakar Menggunakan Katalis Heterogen Berbasis Biomassa Zafarina, Alizza Asry; Fitriani, Desti; Ramadan, Naufal Alip Cahya; Fajriati, Ramadhana Suci; Sihombing, Rony Pasonang
Prosiding Industrial Research Workshop and National Seminar Vol. 14 No. 1 (2023): Vol 14 (2023): Prosiding 14th Industrial Research Workshop and National Semina
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v14i1.5412

Abstract

Pencemaran udara semakin meningkat dari tahun ke tahunnya. Hal tersebut mampu berdampak buruk bagi kesehatan maupun lingkungan. Emisi transportasi memiliki persentase yang cukup tinggi dalam penyebab pencemaran udara yaitu sebesar 80-85%. Oleh karena itu, diperlukan zat aditif pada bahan bakar yang mampu mengurangi pencemaran udara tersebut. Salah satu zat aditif yang dapat digunakan yaitu Etil Levulinat. Etil Levulinat merupakan senyawa kimia yang dihasilkan dari lignoselulosa yang dapat digunakan di berbagai bidang khususnya sebagai zat aditif bahan bakar yang baik dalam mengurangi emisi gas Cox dan NOx. Zat aditif tersebut harus memiliki karakteristik sifat fisikokimia yang baik agar mampu berdampak secara maksimal. Sifat fisikokimia yang dapat mengidentifikasi zat aditif tersebut antara lain densitas, viskositas dan titik didih. Sintesis Etil Levulinat melalui proses Esterifikasi antara Asam Levulinat dan etanol dengan rasio mol 1:12. Pada proses ini menggunakan katalis loading dengan variasi 5%, 10% dan 15%. Analisa pengujian kandungan Etil Levulinat dilakukan menggunakan GC-MS. Karakterisasi terbaik didapatkan pada percobaan rasio mol 1:12 dengan penggunaan katalis loading 10%. Percobaan ini memiliki nilai densitas 0,9736; nilai viskositas 1,57; dan titik didih 92 yang hampir mendekati karakteristik Etil Levulinat pada umumnya.
Sintesis Asam Levulinat Melalui Metode Esterifikasi dengan Etanol 96% menggunakan Katalis Heterogen Berbasis Biomassa untuk Pembuatan Zat Aditif Bahan Bakar Suminar, Dian Ratna; Anindita, Faradila; Fajriati, Ramadhana Suci; Sihombing, Rony Pasonang
Prosiding Industrial Research Workshop and National Seminar Vol. 14 No. 1 (2023): Vol 14 (2023): Prosiding 14th Industrial Research Workshop and National Semina
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v14i1.5433

Abstract

Indonesia menjadi negara dengan polusi udara terbesar di asia tenggara, penyebab polusi udara salah satunya ialah asap kendaraan, oleh karena itu perlu dilakukannya solusi untuk mengurangi masalah tersebut. Etil levulinat merupakan senyawa kimia yang dihasilkan dari lignoselulosa yang dapat digunakan di berbagai bidang khususnya sebagai zat aditif bahan bakar yang bagus untuk mengurangi emisi gas Cox dan NOx. Pembuatan etil levulinat dari asam levulinat dan etanol dilakukan melalui metode esterifikasi menggunakan katalis heterogen karbon sulfonat. Katalis didapat dari sekam padi yang telah melalui proses karbonisasi dengan suhu 550oC selama ± 75 menit, yang dilanjutkan dengan proses sulfonasi menggunakan asam sulfat 98% dengan suhu 150oC selama 4 jam. Proses sintesis dilakukan dengan variasi waktu 3 jam, 6 jam, dan 9 jam, rasio molar asam levulinat dan etanol (1:4, 1:8, dan 1:12), dan jumlah katalis (5%,10%, dan 15%). Dihasilkan konversi optimum sebesar 85% Pada waktu 6 jam perbandingan rasio mol 1:12 dengan katalis loading 10%.
Signifikansi Kadar Kafein pada Kopi Kerinci Robusta dalam Berbagai Interval Waktu Soeswanto, Bambang; Yusuf, Yusmardhany; Sihombing, Rony Pasonang; Suryadi, Joko; Luviana, Angely; Asyari, Restu Adji Alif; Adhitasari, Alfiana
Eksergi Vol 20, No 3 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i3.10353

Abstract

Kopi Kerinci Robusta merupakan salah satu kopi yang digemari masyarakat Indonesia yang tumbuh di daerah Kerinci. Selama ini masyarakat hanya mengenal kopi ini untuk dinikmati saja, tanpa memperhitungkan jumlah kandungan kafein yang akan terkonsumsi. Penelitian ini bertujuan untuk mengetahui rasio terbaik pada ekstraksi kopi Kerinci Robusta menggunakan pelarut etil asetat. Rasio umpan: pelarut (b/v) yang digunakan adalah 1:5; 1:7.5; 1:10; 1:12.5. Pelarut yang digunakan dalam penelitian ini adalah etil asetat. Metode penelitian yang digunakan adalah metode ekstraksi dengan kondisi operasi 50⁰C selama 2 jam dengan interval pengambilan sampel setiap 20 menit. Kadar kafein hasil penelitian diukur dengan menggunakan spektrofotometri pada panjang gelombang 273 nm. Hasil penelitian menunjukkan bahwa rasio optimum adalah rasio 1:5 yang menghasilkan kadar kafein sebesar 3737.41 ppm.
Effect of Fruit Ripening Level and Roasting Temperature on Robusta Coffee Bean Quality Muhari, Emma Hermawati; Sihombing, Rony Pasonang; Sarungu, Yunus Tonapa; Marlina, Ari; Leoanggraini, Unung; Hariyadi, Tri
Jurnal Internasional Penelitian Teknologi Terapan Vol 4 No 1 (2023): April 2023
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v4i1.88

Abstract

The purpose of this study is to determine the effect of roasting temperature on the chemical content of Robusta coffee at various levels of Robusta coffee maturity. The research will be conducted at roasting temperatures of 190℃, 200℃, 210℃, 220℃ and chemical content analysis is carried out bygravimetric method and UV-VIS spectrophotometry on fresh beans, green beans and coffee beans at each temperature variation and the maturity level of Robusta coffee. Maturity of coffee beans will be classified visually and use an RGB meter to help and facilitate the selection of coffee beans in accordance with the level of maturity. The variables taken and observed in the study are the temperature of the roasting process, the time required at the time of roasting, as well as the mass, chemical content and physical parameters of robusta coffee beans observed before and after the roasting process. Chemical content was observed in the form of water content, fat content, caffeine, and antioxidants, then the physical parameters observed were aroma, color, shape, taste, and characteristics of coffee beans at each level of robusta coffee fruit maturity. The results obtained value of the chemical content and organoleptic test at each level of maturity of the coffee fruit and roasting temperature variations because basically the roasting temperature will produce coffee beans that have their own characteristics and flavors. This study also determines the value of the mass transfer coefficient and heat transfer in the drying process by the roasting method.
Characterization of Banana Peel Corrosion Inhibitor by Vacuum Microwave Assisted Extraction (VMAE) Method in 2% HCl Environment binti Jamaluddin, Jamarosliza; Paramitha, Tifa; Salsabila, Iva Najwa; Luviana, Angely; Ramadhan, Muhammad Zikri; Putri, Angelina; Nurbaits, Alisya; Sihombing, Rony Pasonang
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 1 (2024): February 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i1.144

Abstract

Banana peel is a waste that is very abundant in Indonesia. The utilization of banana peel can be used for corrosion inhibitors. The type of environment applied in this study is an acidic environment, which is carried out in 2% HCl solution media. The purpose of this study is utilize banana waste extract obtained from the VMAE method. The extract was obtained by VMAE method at 150 watts, 300 watts and 450 watts for 10 minutes using ethanol solvent. The ratio of feed and solvent used was 1:10 (b/v). The results of the extract were subjected to phytochemical tests using Dragendroff, Wagner and Mayer reagents. After that, the extract was applied to the media for corrosion rate test and GC-MS. The results of the study showed that the lowest corrosion rate was obtained at a concentration of 1500 ppm non-aerated which was 0.7347 mmpy. While based on the GC-MS test results, terpenoid compounds and vitamin E can be detected from banana peel extract, where these two compounds are antioxidant substances that can be utilized as corrosion inhibitors.
Turmeric (Curcuma longa) Extract Characterization for Corrosion Inhibitor using Microwave-Assisted Extraction Paramitha, Tifa; Luviana, Angely; Putri, Angelina; Reynaldi, Randi; Azzahra, Rafila Chika; Paramitha, Tika; Sihombing, Rony Pasonang
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 9, No 1 (2024): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v9i1.79249

Abstract

Metallic corrosion, the deterioration process induced by the interaction between metals and corrosive environments, poses a significant challenge to material integrity and longevity. Corrosion inhibitors have been identified as an effective approach among various mitigation strategies. Natural extracts, such as those derived from turmeric/Curcuma longa, have garnered attention for their potential as eco-friendly corrosion inhibitors. This study endeavors to extract, characterize, and evaluate turmeric extract's efficacy as a corrosion inhibitor within a 30% acetic acid solution. Employing microwave-assisted extraction with a 96% ethanol solvent facilitated the isolation of the extract, which was subsequently subjected to qualitative analysis through phytochemical screenings and Gas Chromatography-Mass Spectrometry (GC-MS). These analyses confirmed the presence of antioxidative phytochemicals, including alkaloids, terpenoids, turmeronoids, curcumin, sesquiterpenoids, and phenols. The corrosion inhibitory properties of turmeric extract were assessed via immersion and flow loop experiments, revealing a notable reduction in corrosion rates—from 0.1540 mm/year to 0.0801 mm/year in immersion tests and from 5.3747 mm/year to 2.9369 mm/year in flow loop tests. Such outcomes underscore turmeric extract's potential as a viable corrosion inhibitor, attributed primarily to the chemical interactions facilitated by curcumin's phenolic and carbonyl groups with the metal surface, thereby enhancing protective efficacy. The inhibitor efficiency was quantified at 47.9743% and 45.3565% for immersion and flow loop tests, highlighting the extract's substantial inhibitory performance.
Impact of Cathode Variations on the Mechanical Properties of Hard Anodizing in Sulfuric Acid 15% and Phosphoric Acid 1% Sihombing, Rony Pasonang
Jurnal Internasional Penelitian Teknologi Terapan Vol 5 No 3 (2024): October 2024
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i3.194

Abstract

Aluminum 1100 could be used as domestic appliances material, especially on kitchen equipment. The purpose of this research was to improve the properties of aluminum 1100. In order to improve the physical and mechanical properties, a hard anodizing process was conducted. In the hard anodizing process, 1100 aluminum workpieces are sanded, decreased in alkaline solution and neutralized in acidic solution. The hard anodizing process is carried out by placing the workpiece on the positive pole and the electrode on the negative pole (cathode) of the direct current source. The hard anodizing process of 1100 aluminum alloy was carried out in a mixture of 15% sulfuric acid and 1% phosphoric acid solution, current density of 3A/dm2, anodizing time of 30 minutes, temperature of 5 °C, and cathode variation (Al and Pb). The results showed the formation of an oxide layer on the metal surface consisting of two types of layers, called the barrier layer and the porous layer. The barrier layer has no pores because it has conductive microstructure properties and reaches the maximum thickness. The porous layer formed can increase the overall thickness of the oxide layer, while the barrier layer remains a constant thickness and increases the hardness level of the aluminum. This study resulted in a process efficiency of 83.04% with the best oxide layer thickness of 11.43 μm and the highest hardness of 144.25 HVNoxide layer thickness of 11.43 μm and the highest hardness of 144.25 HVN.
Adsorption of Methylene Blue Using Activated Carbon Bioadsorbent Coffee Grounds and Reed Grass Without Flow Rate Hidayatulloh, Irwan; Kurnia, Dianty Rosirda Dewi; Anggorowati, Heni; Muhari, Emma Hermawati; Kharisma, Luthfiana; Sari, Radianti Novita; Paramitha, Tifa; Sihombing, Rony Pasonang
Fluida Vol. 17 No. 2 (2024): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v17i2.6269

Abstract

Methylene blue adsorption research has been conducted using bioadsorbents from activated carbon of coffee grounds and reeds. Coffee grounds and reeds contain carbon and cellulose that are effective for binding dyes. This study aims to determine the characteristics of activated carbon from coffee grounds and reeds based on SNI-06-3730-1995 and assess the color reduction of wastewater referring to the Decree of the Minister of Environment No. 51/MENLH/1995, which sets the maximum methylene blue content in industrial wastewater at 5-10 mg/L. The research method includes bioadsorbent preparation, characterization, and adsorption process with UV-Vis spectrophotometric analysis. Mass ratio variation was conducted on each adsorbent at each contact time variation and methylene blue concentration variation. The results of the analysis showed that the activated carbon of coffee grounds and reeds fulfills SNI-06-3730-1995 which is characterized by values that are below the maximum value in each parameter. The effectiveness of methylene blue adsorption by coffee grounds and reeds activated carbon reached 98.15% at a ratio of coffee grounds and reeds activated carbon 0:1 (w/w) for 120 minutes at a concentration of 25 mg/L. The adsorption capacity using the Freundlich isotherm method on reed activated carbon was 1.100 mg/g and coffee grounds activated carbon was 1.019 mg/g. The adsorption process of coffee grounds and reeds activated carbon has no effect on the carbon and cellulose structure of coffee grounds and reeds contained in activated carbon, namely O-H, C-H, C=C, and C=O.
Efektivitas Ekstrak Bunga Telang (Clitoria ternate L.) sebagai Inhibitor Korosi Ramah Lingkungan dalam Media Asam Ferawati, Yohana Fransiska; Sajida, Gita Nur; Krista, Gustin Mustika; Sari, Hermin Kartika; Taufiqurohim, Teguh; Sihombing, Rony Pasonang
Jurnal Serambi Engineering Vol. 10 No. 3 (2025): Juli 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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

Abstract

Corrosion is an indicator of metal quality degradation. One method to prevent corrosion is by using corrosion inhibitors. Corrosion inhibitors are compounds added to corrosive media to reduce the rate of corrosion. The use of environmentally friendly natural inhibitors such as butterfly pea flower extract can serve as an alternative to hazardous chemical inhibitors. This study aims to evaluate the performance of natural inhibitors derived from butterfly pea flower extract in preventing corrosion of low-carbon steel plates. The experiment was conducted in 0.25 N and 0.5 N HCl media with inhibitor concentrations ranging from 100 to 1000 ppm. The steel plates were immersed for 7 days. The parameters studied were corrosion rate and inhibitor efficiency. The results showed that higher inhibitor concentrations led to lower corrosion rates in both acidic media. The lowest corrosion rate was obtained at 1000 ppm inhibitor concentration, with a value of 228.70 mdd and an efficiency of 32.12% in 0.5 N HCl solution, while in 0.25 N HCl solution, the lowest corrosion rate was 156.69 mdd with an efficiency of 30.66%. This study indicates that butterfly pea flower extract has potential as an effective corrosion inhibitor for low-carbon steel plates in an acid medium. This finding supports its application as a sustainable alternative for corrosion control.
The Effect of Solvent-to-Coffee Ratio on Caffeine Content in Ethyl Acetate Extracts of Arabica Gayo Coffee Beans Soeswanto, Bambang; Sihombing, Rony Pasonang; Suryadi, Joko; Hariyadi, Tri; Paramitha, Tifa; Yusuf, Yusmardhany; -, Alfiana Adhitasari
KOVALEN: Jurnal Riset Kimia Vol. 9 No. 3 (2023): December 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.i3.16573

Abstract

This paper studies the optimal ratio that gives the highest caffeine amount and improves the efficiency and quality of extraction from Arabica Gayo coffee beans. No previous studies have explored the best ratio of Gayo Arabica coffee beans to ethyl acetate solvent for extracting caffeine. The paper explains the method used, which has four main steps: preparing materials, extracting and measuring caffeine, and analyzing the results. The paper presents the experimental findings and discusses how different ratios affect caffeine content in Arabica Gayo coffee beans. It uses statistics to show significant differences between the ratios and compares them using Tukey tests. The paper concludes that the best solvent-to-coffee ratio for maximizing caffeine in ethyl acetate extracts is 1:5, resulting in a concentration of 1411.1 ppm. This ratio gives the best balance between caffeine yield and solvent usage.
Co-Authors -, Alfiana Adhitasari Adi Rizki Nugraha Ageng Priyambudi Ahmad Fauzan Alamsari, Jasinta Putri Alatif, Ikhsan Akmal Alfiana Adhitasari Alisya Nurbaits Althafa Muntaqin Anindita, Faradila Anisa, Vira Rizki Annisa Nurlatifah Asyari, Restu Adji Alif Azzahra, Rafila Chika Bambang Soeswanto binti Jamaluddin, Jamarosliza C. Yudha Hidayatulloh Cecep Yudha Hidayatullah Dieni Nurul Fathiyyah Fajriati, Ramadhana Suci Fatah, Khalaida Fania Fatimah Fauzan, Rizky Ferawati, Yohana Fransiska Fitriani, Desti Gunawan, Sinna Chaerunnabila Hariyadi, Tri Hidayatulloh, Irwan Ibrahim, Idham Kholid Indarti, Retno Jayanti, Retno Dwi Keryanti, Keryanti Khalisha, Keira Kharisma, Luthfiana Krista, Gustin Mustika Kurnia, Dianty Rosirda Dewi Lutfiah Rahmasari Luviana, Angely Malik, Dava Maulana Marlina, Ari Maryani, Anisya Sri Muhammad Fadly Wiryawan Kautsar, Muhari, Emma Hermawati Muhari, Emma Hermawati Muhari Mukhtar Gozali Nanda Liant Kumara Ngatin, Agustinus Nidaa’ Rihhadatul ‘Aisya Komara Nidaulhusna, Anisa Ninik Lintang Edi Wahyuni Nurbaits, Alisya Nurcahyo Nurcahyo, Nurcahyo Nurhasanah, Santy Nurulgina, Rahma Paramitha, Tifa Permanasari, Ayu Ratna Permatasari, Rahma Puspa Puspita, Nina Putri Utami Dita Cahya Putri, Angelina Rahmawati, Sri Puji Ramadan, Naufal Alip Cahya Ramadhan, Muhammad Zikri Ramadhani, Isma Afifah Renata, Calvin Aditya Restu Adji Alif Asyari Retno Indarti Reynaldi, Randi Rijal Muyasar Fahmi Risnandar, Tiara Devita Rispiandi Rispiandi Robby Sudarman Rusmana, Muchamad Raihan Surya Sajida, Gita Nur Salsabila Nisrina Junaedi Salsabila, Intan Salsabila, Iva Najwa Salsabila, Shafira Salsabilla, Iva Najwa Sari, Hermin Kartika Sari, Radianti Novita Silalahi, Rafael Leonardo Solehuddin Al-Ayubi Solehudin Al-Ayubi Sudrajat Harris Abdulloh Suminar, Dian Ratna Suryadi, Joko Tamba, Alfonsius Perdija Teguh Taufiqurohim Tika Paramitha Tri Hariyadi Unung Leoanggraini Wahyu Wibisono Wahyuni, Ninik Lintang Edi Widya Fitria Nur Fauziah Wina Maulida Yulistiani, Fitria Yunus Tonapa Sarungu Yusmardhany Yusuf Yusmardhany Yusuf Yusuf, Yusmardhany Zafarina, Alizza Asry