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All Journal Jurnal Bestari Reaktor International Journal of Science and Engineering (IJSE) International Journal of Renewable Energy Development TEKNIK MEDIA KOMUNIKASI TEKNIK SIPIL METANA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Bahan Alam Terbarukan Waste Technology Eksergi: Chemical Engineering Journal Techno: Jurnal Penelitian Bulletin of Chemical Reaction Engineering & Catalysis Journal of Engineering and Technological Sciences Majalah Ilmiah MOMENTUM ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika International Journal of Artificial Intelligence Research Jurnal Ekonomi dan Bisnis Indonesian Journal of Chemistry Jurnal Aplikasi Teknologi Pangan Indonesia Journal of Halal PRoMEDIA Journal of Innovation in Business and Economics Andalas obstetrics and gynecology journal ASEAN Journal of Chemical Engineering Budimas : Jurnal Pengabdian Masyarakat Jurnal Teknik Kimia Indonesia Jurnal Pengabdian dan Peningkatan Mutu Masyarakat (JANAYU) Jurnal Ilmu Sosial Indonesia (JISI) Jurnal Energi Baru dan Terbarukan Journal of Bioresources and Environmental Sciences Jurnal Riptek Eduvest - Journal of Universal Studies Jurnal Profesi Insinyur Indonesia Journal of Bioresources and Environmental Sciences International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis JURNAL REKAYASA KIMIA & LINGKUNGAN
. Widayat
Chemical Engineering Department, Faculty Of Engineering, Diponegoro University, Jl. Prof. Soedarto, SH, Tembalang, Semarang 50275
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Journal : International Journal of Renewable Energy Development

 1 
Evaluation and Modification of Processes for Bioethanol Separation and Production P Sitompul, Johnner; Widayat, Widayat; H. Soerawidjaja, Tatang
International Journal of Renewable Energy Development Vol 1, No 1 (2012): February 2012
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.1.1.15-22

Abstract

This paper concerns on process evaluation and modification for bioethanol separation and production by applying pinch technology. Further, the paper is also focused on obtaining a most energy-efficient process among several processes. Three basic process configurations of bioethanol separation and production were selected for this study. The three separations and production systems are Othmer process, Barbet process and a separation process that operates under vacuum condition. Basically, each process is combination of Danish Distilleries process with a separation system yielding 95% (v/v) bioethanol. The production capacity of the plant is estimated about 4 x 107 litre of bioethanol 95% (v/v) per year. The result of the studies shows that the most energy efficient process among the three processes evaluated is the Othmer process, followed by the Barbet process and the process involving vacuum operation. The evaluation also shows that further energy saving can be carried for Barbet and Othmer process configuration when Tmin = 10oC for heat exchange possible.
Potency of Microalgae as Biodiesel Source in Indonesia Hadiyanto, Hadiyanto; Widayat, Widayat; Cahyo Kumoro, Andri
International Journal of Renewable Energy Development Vol 1, No 1 (2012): February 2012
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.1.1.23-27

Abstract

Within 20 years, Indonesia should find another energy alternative to substitutecurrent fossil oil. Current use of renewable energy is only 5% and need to be improved up to 17%of our energy mix program. Even though, most of the area in Indonesia is covered by sea, howeverthe utilization of microalgae as biofuel production is still limited. The biodiesel from currentsources (Jatropha, palm oil, and sorghum) is still not able to cover all the needs if the fossil oilcannot be explored anymore. In this paper, the potency of microalgae in Indonesia was analysed asthe new potential of energy (biodiesel) sources.
Ultrasound Assisted Esterification of Rubber Seed Oil for Biodiesel Production Widayat, Widayat; Fajar Tamtomo Kiono, Berkah
International Journal of Renewable Energy Development Vol 1, No 1 (2012): February 2012
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.1.1.1-5

Abstract

Production of biodiesel is currently shifting from the first to the second generation inwhich the raw materials are mostly from non-edible type oils and fats. Biodiesel production iscommonly conducted under batch operation using mechanical agitation to accelerate masstransfers. The main drawback of oil esterification is the high content of free fatty acids (FFA) whichmay reduce the yield of biodiesel and prolong the production time (2-5 hours). Ultrasonificationhas been used in many applications such as component extraction due to its ability to producecavitation under certain frequency. This research is aimed to facilitate ultrasound system forimproving biodiesel production process particularly rubber seed oil. An ultrasound unit was usedunder constant temperature (40oC) and frequency of 40 Hz. The result showed that ultrasound canreduces the processing time and increases the biodiesel yield significantly. A model to describecorrelation of yield and its independent variables is yield (Y) = 43,4894 – 0,6926 X1 + 1,1807 X2 –7,1042 X3 + 2,6451 X1X2 – 1,6557 X1X3 + 5,7586 X2X3 - 10,5145 X1X2X3, where X1 is mesh sizes, X2ratio oil: methanol and X3 type of catalyst.
Multi-Feedstocks Biodiesel Production from Esterification of Calophyllum inophyllum Oil, Castor Oil, Palm Oil and Waste Cooking Oil Hadiyanto, H; Aini, Apsari Puspita; Widayat, Widayat; Kusmiyati, Kusmiyati; Budiman, Arief; Roesyadi, Achmad
International Journal of Renewable Energy Development Vol 9, No 1 (2020): February 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.1.119-123

Abstract

Biodiesel can be produced from various vegetable oils and animal fat. Abundant sources of vegetable oil in Indonesia, such as Calophyllum inophyllum, Ricinus communis, palm oil, and waste cooking oil, were used as raw materials. Multi-feedstock biodiesel was used to increase the flexibility operation of biodiesel production. This study was conducted to determine the effect of a combination of vegetable oils on biodiesel characteristics. Degumming and two steps of esterification were applied for high free fatty acid feedstock before trans-esterification in combination with other vegetable oils. Potassium hydroxide was used as a homogenous catalyst and methanol as another raw material. The acid value of C. inophyllum decreased from 54 mg KOH/gr oil to 2.15 mg KOH/gr oil after two steps of esterification. Biodiesel yield from multi-feedstock was 87.926% with a methanol-to-oil molar ratio of 6:1, temperature of 60 ℃, and catalyst of 1%wt. ©2020. CBIORE-IJRED. All rights reserved
Biodiesel Production from Rubber Seed Oil via Esterification Process Widayat, Widayat; Suherman, S
International Journal of Renewable Energy Development Vol 1, No 2 (2012): July 2012
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.1.2.57-60

Abstract

One promise source of alternative energy is biodiesel from rubber seed oil, because the raw materials available in plentiful quantities and can be renewed. In addition, the rubber seed is still lack of utilization, and Indonesia is one of the largest rubbers producing country in the world. The objective of this research is to studied on biodiesel production by esterification process. Parameters used in this study are the ratio of catalyst and temperature and its influence on the characteristics of the resulting biodiesel product. Characterization of rubber seed include acid content number analysis, saponification numbers, density, viscosity, iodine number, type of free fatty acids and triglyceride oils. The results of analysis showed that rubber seed oil content obtained is 50.5%. The results of the GCMS analysis showed that a free fatty acid level in rubber seed is very high. Conversion into bio-diesel oil is obtained by at most 59.91% and lowest 48.24%.
Co-Authors A Abdullah A Abdurrakhman A. Sadikky DP Abdullah Abdullah Achmad Roesyadi Achmad Roesyadi Achmad Wildan ADE ARTA, MOCHAMAD ZAINUDIN Adi Darmawan Adit Rizky Wicaksono Afriani, Nurfika Agus Suprihanto Ahmad Juanda Ahmad Ni’matullah, Albaari Ahmad Nur Ihsan Aini, Apsari Puspita Aji Baharsyah Aji Prasetyaningrum Aji, Satriyo Akbar Asfar, A.M. Iqbal Al-Baari, Ahmad N Al-Baarri, Ahmad Ni'matullah Al-Baarri, Ahmad Ni’matullah Alfareza, Muhammad Ircham Almaas Salwa, Diah Ayu Andi Friadi Andika Pradifan Andrew Bryano Kermite, Andrew Bryano Andri Cahyo Kumoro Andri Cahyo Kumoro Andrianto, Novian Andry Anggoro Arahim Anggra Widhi Anggra Widhi Anik Sarminingsih, Anik Annisa Metantya Maharani Aprilina Purbasari Ari Eko Prasetyo Ari Eko Prasetyo Ariadi, Ariadi Arianti Nuur Annisa Arief Budiman Aris Triwiyatno Arman, Mhd. Adithia Perdana Arwan, Berriandi Aulia, Haris Nu’man B Budiyono Bacthiar, Hafni Bagus Agang Sudrajat Bakti Jos Bambang Cahyono Bambang Sudarsono Banowati, Tria Nita Berkah Fajar Tamtomo kiono Bernike Vemmialia Jonfita Budi Warsito Budianto, Irawan Arief Catur Pramono D. Ingrid A D. Soetrisnanto Dani Puji Utomo Danny Soetrisnanto DENNY SANJAYA Dessy Ariyanti Devina Ingrid A. Dita Ayu Sofiati Driastuti, Faradilla Dyah Hesti Wardhani Edward, Leonardo Ela, Hulasoh Elysia, Alvina Enda Merizki br Ginting Fauzan, O. K. Muhammad Fauzandy Husna Setyanto Favian Nafiega Ferdy D, Erbert Fistcar, Wawarisa Alnu H Hadiyanto H M Rachimoellah H Satriadi H. Anggraeni H. Hadiyanto H. Satriadi H. Satriadi Hadiyanto Hadiyanto Hadiyanto Hadiyanto Hamzah, Fazlena Hanapi bin Mat Hanapi bin Mat Handung Nuryadi Hanifa Zakiyatul Urbach Hantoro Satriadi Hantoro Satriadi Hantoro Satriado Hapsari, Farida Diyah Haris Nu'man Aulia Haris Nu’man Aulia Hasanah, Alfi Hazim, M. Syafiq Hendra Try Ardianto Hendro, Andika Herlambang, Andy Rahmadi Heru Susanto Hesti Rahayu I Nyoman Widiasa I. Hartati Ika Windrianto K. Handono Indah Hartati Iqbal Mubarak Irawan Arif Budianto Johnner P Sitompul Khoirun Nisa Kurdianto Kurdianto Kurnia, Atik Kusmiyati, K Lestari, Dwi Fitri Lukman Hakim Firdaus Luqman Buchori M. Djaeni M. Hadi M. Hadi M. Hadi Makrufah Hidayah I Manulang, Amanda Nathalia Harti Marusaha Marcelinus Christwardana Maria Siahaan Marta Chandra Anikke Putri Masyhad Masyhad Meiny Suzery Melati, Emilla Mochamad Arief Budihardjo MSK. Tony Suryo Utomo Muchammad Muchammad Muhammad Farizan Praevia Muhammad Hilmazar Hawari Muhammad Rachimoellah Muhammad Rachimoellah Muhammad Syukri Hasan Muhammad Syukri Hasan Nabilla Salma Listyawijayanti Nasir, Yahya Ndaru Okvitarini Ngadiwiyana M.Si. S.Si. Ngurah Widiantara Ni'matuzahroh Ni'matuzahroh Novianti, Khusnul Rofida Noviyanto, Sigit Nur Rokhati Nurjannah, Rifa Nurul Yaqin Pandapotan, Boris Poltak Prakoso, Satrio Budi Prakoso, Satyo Jati Prasetyo, Ahmad Wisnu Pratomo, Shendy Eko Priyosetyoko Priyosetyoko, Priyosetyoko Puja Chrisdianto Manapa Puteri, Safira Rizkya Putri, Sylvia Rahmi Rahmania, Yusi Luluk Ratnawati Ratnawati Ratnawati, Ida Razak, Habibie Rheza Dipo Ridani, Nuraida Riky Yonas Riky Yonas Riva Amrulloh Roz, Kenny S Suherman S Supriyandi salsabila, elvira Samudra, Makitta Widi Santosa, Edward Emannuel Saudale, Jeanette Mutiara Paula Sekarningtyas, Nazifa Seno, Abdi Setia Budi Sasongko Setia Budi Sasongko Setiabudi, Herma Dina Setiadi, Muhammad Irfan Sianturi, Aurelia Genesya Silviana Silviana Silviana, S Simbolon, Natalia Lydia Efrata Siti Nur Khairunisa Aroli Sonya Hakim Raharjo Sri Nastiti Andharini Sri Puji Lestari Sri Widodo Agung Suedi Sri Widodo Agung Suedy Sriatun Sriatun Striadi, H. Sugiyanto - Sulardjaka Sulardjaka Sulardjaka, S Sulastri, Cucu Sumiati Sumiati Suroso Agus Saputro Sussatrio, Hardito Syafrudin Syafrudin Syaiful . Syarief, Elijah Syifa, Viona Sylvia Rahmi Putri Tatang H. Soerawidjaja Taufiq, Akbar Teguh Purnomo, Teguh Tri Winarni Agustini Tri Winarni, Agustini Tutuk Djoko Kusworo Uray Irzandi Uray Irzandi Utama, Bobby Indra Vicky Ramadhani, Vicky widodo, anton sri Winaningsih, Ima Wira Pinem Yanuar Rifianto YS Darmanto Yudhy Dharmawan Yuliani, Kristina Wulan Yulita Arni Priastiwi Yuliyandjaja, John Philia Yusi Luluk, Rahmania