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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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PRODUCTION OF INDUSTRY SALT WITH SEDIMENTATION – MICROFILTRATION PROCESS: OPTIMAZATION OF TEMPERATURE AND CONCENTRATION BY USING SURFACE RESPONSE METHODOLOGY Widayat, Widayat
TEKNIK Volume 30, Nomor 1, Tahun 2009
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (385.648 KB) | DOI: 10.14710/teknik.v30i1.1826

Abstract

The salt of sodium chloride commonly used consumption in house , so as a raw material in industry. Thequality of salt depends on sodium chloride concentration. The objective of this research is obtained ofoptimum condition in production of salt industry by using sedimentation and microfiltration process. Theoptimization used surface response methodology and analysis by Statistica 6 software. The responseperceived is NaCl concentration in product. The experiments do by mixing stearic acid with NaOH solutionto product stearic sodium. Then, the solution mixed with sea water, so the white solid will be emerge, thereare stearic calcium and stearic magnesium. And so filtrate evaporated until to obtain salt. TheMathematical model for reduction of Ca2+ and Mg2+ are1 222 221 1 Y = 93,3185 + 1,0967 X + 0,1909 X +1,0682 X - 0,2333 X - 0,3376 X X , with maximum conversion is94,46% at temperature 82,42oC and stearic sodium concentration 14,16%(v/v). The maximum of NaClconcentration is 96,19% at temperature 81,54oC and stearic sodium concetration 13,11 %(v/v). Themathematical model for NaCl production is1 222 221 1 Y = 92,7596 - 0,3443 X - 3,3706 X + 2,9553 X - 0,9562 X - 1,9272 X X . The results of NaCl not yetfulfilled with SNI industry salt. The NaCl concetration in SNI is 98,5%. So, this process is nt aplicable forproductiob salt industry in Indonesia.
PEMBUATAN BIODIESEL DARI MINYAK GORENG BEKAS DENGAN PROSES CATALYTIC CRACKING Buchori, Luqman; Widayat, Widayat
TEKNIK Volume 28, Nomor 2, Tahun 2007
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (395.817 KB) | DOI: 10.14710/teknik.v28i2.2116

Abstract

Crude oil is a source of energy which is not be renewable. This fact motivates so much countries ineconomizing on fuel. Many researches have been done to gets another fuel substitute the crude oil.Biodiesel is represented as fuel instead of diesel fuel, and it is produced from vegetable oil. In the otherside, ex-cooking oil is waste-product from food industry, restaurant and household which is potential tobe alternative fuels because of the high contents of carbon and hydrogen atoms. Commonly the biodieselmade from vegetable oil by esterification and transesterification process. But if using esterification andtransesterification process to ex-cooking oil material, it is not economically feasible because the processmakes another reaction between alkaly catalist and oil to produce soap. One of biodiesel process iscatalytic cracking of the ex-cooking oil. This research is aimed to analyze zeolite catalist size effect(0.125mm; 0.3375mm; 0.425mm; 0.85mm; 1.18mm), and acid concentration on the product (2N; 3N;4N). This result shows that at 4N acid concentration and 0.125 mm zeolite catalist size is optimal whichcan reach diesel specification.
STUDI PENGARUH METODE PEMBUATAN DAN SUMBER BAHAN BAKU PADA PROSES PRODUKSI KATALIS DARI ZEOLIT ALAM Widayat, Widayat; Satriadi, H; Roesyadi, Achmad; Rachimoellah, H M
METANA Vol 9, No 01 (2013): Juli 2013
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (201.561 KB) | DOI: 10.14710/metana.v9i01.7206

Abstract

Abstract Indonesia has the potential for considerable natural zeolites. This natural zeolites, silica deposits typically have amounted to 60%, it also contains components of alumina. Silica and alumina oxide compound that can be used as a catalyst, particularly in the process of dehydration. This research aims to study the influence of the method of manufacture of catalysts in the production process of natural zeolite catalyst. The observed response is the surface area in comparison with silica, alumina and kristalitas. The surface area is measured by the method kristalitas and BET with XRD analysis as well as the composition of the silica-alumina with AAS. The methods used in this research is the process of exchanging ions-development with alcohol and dealuminiation process with hydrochloric acid solution. The raw materials used are natural zeolite from Malang, Lampung Province and Regency of Gunung Kidul. The results showed that dealuminasi process with hydrochloric acid produces a better surface area compared to the ion exchange process and development with alcohol. Besides the resulting catalyst with silicate dealuminasi process is a catalyst if the raw material of the Regency of Gunung Kidul and mordenite type if the raw materials used originate from Malang. Key words : Zeolite catalyst, natural zeolites, surface area, crystallite,Si/Al comparison
Efisiensi Energi dan Reduksi Harga Total Produksi Hidrogen pada Siklus Sulfur-Iodine Seksi III Skala Pilot Menggunakan Analisis Pinch Raharjo, Sonya Hakim; Winaningsih, Ima; Widayat, Widayat
TEKNIK Vol 41, No. 1 (2020): May 2020
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (749.849 KB) | DOI: 10.14710/teknik.v41i1.24409

Abstract

Proses produksi hidrogen melibatkan perpindahan panas dari satu aliran proses ke aliran proses yang lain atau dari aliran utilitas ke aliran proses dan sebaliknya. Hal ini memotivasi untuk dilakukan proses efisiensi energi. Pada siklus sulfur-iodine seksi III, proses dekomposisi HI merupakan bagian penting karena merupakan proses terakhir untuk menghasilkan H2. Beberapa unit peralatan dan unit utilitas yang ada dalam sistem proses ini membutuhkan dan menghasilkan energi yang cukup besar. Ditemukan bahwa beberapa penggunaan sistem energi ini dapat dioptimalkan melalui proses analisis efisiensi energi menggunakan analisis pinch. Peneltian ini menggunakan perangkat lunak HINT untuk melakukan analisa pinch dengan variasi minimum temperature approach (ΔTmin). Hasil analisa menunjukkan bahwa pada ΔTmin 10K diperoleh maximum energy recovery (MER) yang tinggi dan total harga produksi H2 yang paling rendah.
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%.
Proses produksi triasetin dari gliserol dengan katalis asam sulfat W Widayat; Hantoro Satriado; A Abdullah; Ika Windrianto K. Handono
Jurnal Teknik Kimia Indonesia Vol 11, No 4 (2013)
Publisher : ASOSIASI PENDIDIKAN TINGGI TEKNIK KIMIA INDONESIA (APTEKIM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jtki.2013.12.1.3

Abstract

Triacetin production process from glycerol using sulfuric acid as catalyst.Glycerol can be produced from biodiesel production process with transesterification reaction. Glycerol of this reaction, not fully utilized as raw materials or as chemial products. Triacetate is a product of the esterification reaction of glycerol with acetic acid. Triacetate can be used for food and non-food. The objective of this study was to study the effect of temperature and the ratio of reactants on glycerol conversion on triacetate production process. The experiments were carried in batch process and total volume of glycerol and acetic acid 600 mL, stirring speed of 100 rpm and catalyst of sulphuric acid was 5 %-w glycerol based. The results of the qualitative analysis by means of FTIR confirmed there is Triacetate as product. Increasing of ratio molar of glycerol to acetic acid increased of glycerol conversion. The similar result obtained for temperature. The glycerol conversion was 67.6% and selectivity of triacetate 25%, where obtained using the reaction condition: mole ratio of glycerol to acetic acid 1:7, temperature 120 oC and 50 minutes.Keywords: glycerol, acetate acid, esterification, triacetin, glycerol conversion AbstrakGliserol dapat dihasilkan dari proses produksi biodiesel dari proses transesterifikasi. Gliserol dari proses ini, belum dimanfaatkan secara maksimal sebagai bahan baku maupun sebagai produk jadi. Triasetin atau gliserol triasetin merupakan produk reaksi esterifikasi gliserol dengan asam asetat. Kegunaan triasetin cukup banyak baik untuk keperluan bahan pangan maupun non pangan. Penelitian ini bertujuan untuk mempelajari pengaruh temperatur dan perbandingan reaktan terhadap konversi gliserol dalam proses produksi triasetin. Percobaan dilakukan dengan proses curah, dimana volume total gliserol dan asam asetat sebesar 600 mL, kecepatan pengadukan 100 rpm dan katalis asam sulfat adalah 5 %-b gliserol. Hasil analisis kualitatif dengan alat FTIR menunjukkan adanya produk triasetin, dimana kesesuaian dengan bahan standar triasetin cukup tinggi. Peningkatan perbandingan gliserol dengan asam asetat akan meningkatkan konversi gliserol. Demikian juga dengan peningkatan temperatur juga akan meningkatkan konversi gliserol. Hasil yang terbaik diperoleh pada perbandingan mol pereaksi gliserol dan asam asetat 1:7 temperatur 120 oC, waktu 50 menit dengan nilai konversi sebesar 67,6% dan selektivitas sebesar 25%. Kata kunci: gliserol, asam asetat, esterifikasi, triasetin, konversi gliserol
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 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 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 Budi Warsito Budianto, Irawan Arief Catur Pramono D. Ingrid A D. Soetrisnanto Dani Puji Utomo Danny Soetrisnanto DENNY SANJAYA Devina Ingrid A. Dita Ayu Sofiati Driastuti, Faradilla Dyah Hesti Wardhani Edward, Leonardo Ela, Hulasoh Elysia, Alvina Enda Merizki br Ginting 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 Hanapi bin Mat Hanapi bin Mat Handung Nuryadi Hanifa Zakiyatul Urbach Hantoro Satriadi Hantoro Satriado Haris Nu'man Aulia Haris Nu’man Aulia Hasanah, Alfi Hendra Try Ardianto Hendro, Andika Herlambang, Andy Rahmadi Heru Susanto Hesti Rahayu I. Hartati Ika Windrianto K. Handono Indah Hartati Iqbal Mubarak Irawan Arif Budianto Johnner P Sitompul Jonfita, Bernike Vemmialia Khoirun Nisa Kurdianto Kurdianto Kurnia, Atik Kusmiyati, K Listyawijayanti, Nabilla Salma Lukman Hakim Firdaus Luqman Buchori M. Djaeni M. Hadi M. Hadi M. Hadi Makrufah Hidayah I 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 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 Putri, Sylvia Rahmi Rahmania, Yusi Luluk Ratnawati Ratnawati Razak, Habibie Rheza Dipo Riky Yonas Riky Yonas Riva Amrulloh Roz, Kenny S Suherman S Supriyandi Samudra, Makitta Widi Saudale, Jeanette Mutiara Paula Sekarningtyas, Nazifa Seno, Abdi Setia Budi Sasongko Setia Budi Sasongko Setiadi, Muhammad Irfan Sianturi, Aurelia Genesya Silviana Silviana Silviana, S 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 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