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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

Author-ID : 415198

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PENINGKATAN KUALITAS DAN PROSES PEMBUATAN BIODIESEL DARI BLENDING MINYAK KELAPA SAWIT (PALM OIL) DAN MINYAK KELAPA (COCONUT OIL) DAN BANTUAN GELOMBANG ULTRASONIK Satriadi, Hantoro; Nafiega, Favian; Widayat, W.; Dipo, Rheza
TEKNIK Vol 35, No 2 (2014): (Desember 2014)
Publisher : Diponegoro University

Keterbatasan solar sebagai sumber energi bahan bakunya tidak dapat diperbaharui menuntut adanya bahan baku alternatif yang dapat diperbaharui dan ramah lingkungan untuk pembuatan biodiesel. Reaksi utama produksi biodiesel adalah esterifikasi dan transestirifikasi yang berlangsung lambat dan membutuhkan banyak katalis dan alkohol. Reaksi yang terjadi belum sempurna dan belum memenuhi standar SNI dan ASTM. Untuk memperbaiki mutu biodiesel serta menghasilkan yield maksimal, maka dilakukan blending bahan baku antara minyak kelapa sawit dan minyak kelapa dan dengan bantuan gelombang ultrasonic. Penelitian ini bertujuan untuk mempelajari pengaruh variabel perbandingan volume minyak kelapa sawit dan minyak kelapa, perbandingan volume methanolminyak, dan persentase berat katalis terhadap minyak terhadap hasil atau yield biodiesel. Alat utama yang digunakan adalah reaktor yang dilengkapi pembangkit gelombang ultrasonic dengan temperature 60 oC, tekanan 1 atm, volume 3 liter, dan frekuensi 28 kHz. Variabel proses pada penelitian ini adalah perbandingan volume minyak sawit dan kelapa 2:1, 3:1, dan 4:1, pebandingan volume metanol-minyak 0,2:1, 0,25:1, dan 0,3:1, dan persentase berat katalis KOH terhadap minyak 0,3%, 0,5%, dan 0,7%. Hasil penelitian didapat konversi tertinggi dicapai pada variabel perbandingan volume minyak sawit dan kelapa 3:1, perbandingan volume metanol/minyak 0,25:1, dan persentase berat katalis terhadap minyak dengan yield 97,26%.[A Improvement of Quality and Process for Biodiesel Production from Palm Oil and Coconut Oil Blends with Ultrasound Assisted] Limitations of solar energy as a source of raw material cannot be renewed demands for alternative raw materials that are renewable and environmentally friendly for the manufacture of biodiesel. The main production of biodiesel reaction is esterification and transestirifikasi which runs slow and requires a lot of alcohol and a catalyst. Reactions that happen yet perfect, and has not met the standard of SNI and ASTM. To improve the quality of biodiesel as well as produce maximum yield, then do the blending of raw materials between Palm oil and coconut oil and with the help of ultrasonic waves. This research aims to study the influence of variable ratio of the volume of palm oil and coconut oil, methanol-oil volume ratio, and the percentage of weight of the catalyst to oil to biodiesel results or yield. The main tool used by the reactors are equipped with ultrasonic wave generator temperature 60 oC, pressure 1 atm, 3 liters of volume, and frequency 28 kHz. Process variables in this study is a comparison of the volume of palm oil and coconut 2:1, 3:1 and 4:1, ratio volume of methanol-oil 0.2:1, 0.25:1, and 0,31:1, and the percentage of weight of KOH catalyst to oil 0.3%, 0.5% and 0.7%. Results of the study had the highest conversion achieved at variable volume ratio of palm oil and coconut 3:1, a comparison of the volume of methanol/oil 0.25:1, and the percentage of the weight of oil with the catalyst to yield 97,26%.Copyright (c) by Fakultas Teknik, Undip. All right reserved.

PROSES PRODUKSI KATALIS ZEOLIT X DAN UJI AKTIFITAS DALAM PROSES PENUKARAN ION KALSIUM Widayat, Widayat; Sadikky DP, A.; Anggraeni, H.
TEKNIK Volume 33, Nomor 1, Tahun 2012
Publisher : Diponegoro University

Zeolie is a material that used in chemical process industry. Zeolite commonly used as catalyst, adsorbent adnion exchanger.Zeolite can be obtained from natural resources and synthetic in industry. The type of zeolitethatused as ion exchanger zeolite X. Zeolite X can produced hy uding hydrogel process and clay process. Thisreasearch was study influencing of temperature and ratio sodium hydroxide (NaOH) to water glass in zeolite Xpreparation. Crystallity of zeolite X was analyzed with X-ray diffraction (XRD) and the activity was used asion exchanger. Response variabel in this research is weight of zeolite X and the capability as ion exchanger.Ion exchange test that used for exchange of calsium. Calsium ion was analizyed by using complexometrymethod. The results of this research shown that zeolit X was obtained in temperature 100oC and rationweight of sodium hidroxide (NaOH) to water glass 1:2. The zeolite X can be used as ion exchanger especiallyfor calsium ion.

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

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

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.

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

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 (Î”Tmin). Hasil analisa menunjukkan bahwa pada Î”Tmin 10K diperoleh maximum energy recovery (MER) yang tinggi dan total harga produksi H2 yang paling rendah.

Sintesis, Karakterisasi dan Pengujian Katalis CaO-MgO/Fe2O3 dari Dolomit dan Pasir Besi untuk Pembuatan Biodiesel dari Minyak Goreng Bekas Widayat, Widayat; Arman, Mhd. Adithia Perdana; Syarief, Elijah; Buchori, Luqman; Sulardjaka, Sulardjaka
TEKNIK Vol. 45, No. 1 (2024): May 2024
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v45i1.56423

Pengembangan katalis CaO-MgO/Fe2O3 dari dolomit dan pasir besi dilakukan pada penelitian ini. Penelitian bertujuan untuk mengetahui karakteristik kimia dan fisika katalis CaO-MgO/Fe2O3 serta kinerjapada produksi biodiesel. Sintesis katalis dilakukan dengan metode impregnasi, dimana fasa CaO-MgO terlebih dahulu didapatkan dari dolomit dengan metode kalsinasi. Fe2O3 dihasilkan dari pasir besi dengan metode ko-presipitasi yang melibatkan larutan asam dan basa. Pengaruh komposisi CaO-MgO dan Fe2O3 terhadap yield biodiesel dikaji dengan melakukan variasi rasio CaO-MgO : Fe2O3 sebesar 1:1, 2:1 dan 3:1. Variasi temperatur kalsinasi katalis dilakukan pada 800oC, 900oC dan 1000oC untuk mengetahui pengaruh karakteristik fisik terhadap produksi biodiesel. Karakterisasi katalis dengan menggunakan metode SEM-EDX menunjukkan struktur morfologi dan komposisi elemen pada katalis. Biodiesel yang diproduksi dengan katalis CaO-MgO/Fe2o3 memiliki standar mutu sesuai SNI 7182: 2015. Katalis dengan rasio CaO-MgO : Fe2O3 sebesar 3:1 yang dikalsinasi pada temperatur 900oC menghasilkan yield biodiesel tertinggi yaitu 54,2%. Katalis CaO-MgO/ Fe2O3 dapat digunakan dalam produksi biodiesel dengan reaksi esterifikasi dan trans esterifikassi secara simultan dan dibutuhkan peningkatan kinerja lebih lanjut sehingga lebih ekonomis.

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 Nuâ€™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 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 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 Khoirun Nisa Kurdianto Kurdianto Kurnia, Atik Kusmiyati, K 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 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 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

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