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All Journal Reaktor International Journal of Renewable Energy Development TEKNIK Rotasi METANA BERKALA FISIKA JURNAL KIMIA SAINS DAN APLIKASI JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Analisis: Jurnal Studi Keislaman Geoplanning : Journal of Geomatics and Planning Jurnal Riset Pendidikan Matematika Jurnal Riset Industri Mesin JUPE : Jurnal Pendidikan Mandala Universitas Muhammadiyah Yogyakarta Undergraduate Conference Proceeding Jurnal Sosial dan Sains International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Journal of Chemical Engineering Research Progress JURNAL REKAYASA KIMIA & LINGKUNGAN

I. Istadi

Department Of Chemical Engineering, Diponegoro University, Jl. Prof. Soedarto, Kampus UNDIP Tembalang, Semarang 50239

Author-ID : 205981

Agriculture, Biological Sciences & Forestry Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences

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KAJIAN PENGGUNAAN KARBON AKTIF DAN ZEOLIT SECARA TERINTEGRASI DALAM PEMBUATAN BIOMETHANE BERBASIS BIOGAS Harihastuti, Nani; ., Purwanto; ., Istadi
Jurnal Riset Industri Vol 8, No 1 (2014): Teknologi Proses Berbasis Efisiensi Energi
Publisher : Badan Penelitian dan Pengembangan Industri

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (107.221 KB)

Artikel ini merupakan suatu kajian dari hasil-hasil penelitian yang telah dilakukan untuk memurnikan biogas. Kandungn dalam biogas terdapat gas-gas pengotor seperti H2S, CO2, NH3, dan H2O yang apabila tidak dihilangkan dapat mempengaruhi pada proses pembakaran dan menimbulkan kerugian manusia dan lingkungan. Penelitian-penelitian yang telah dilakukan mengenai pemurnian biogas Â hanya bertujuan untuk menghilangkan satu atau beberapa komponen gas pengotor secara parsial saja, maka dilakukan kajian ini agar dapat dilakukan penelitian pemurnian biogas secara terintegrasi untuk menghilangkan komponen gas pengotor secara menyeluruh sehingga diperoleh CH4 dengan kemurnian tinggi. Tahapan proses pemurnianÂ yang dirancangadalah proses kondensasi yang terintegrasi dengan proses adsorpsi menggunakan adsorben karbon aktif dan zeolit, sehingga dihasilkan gas CH4 dengan kemurnian tinggi sebagai biomethane sumber energi terbarukan.Â Kata kunci: integrasi, adsorpsi, karbon aktif-zeolit, biogas, biomethaneÂ

MODEL HETEROGEN PENGERINGAN BUTIRAN JAGUNG DALAM UNGGUN DIAM Istadi, Istadi; Sitompul, J. P
Mesin Vol 15, No 3 (2000)
Publisher : Mesin

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This paper deals with one-dimensional dynamic modelling and simulation of deep -bed com drying by two-phase model or heterogeneous model The models consider mass and heat transfer process within grain and drying air phase. This model also considers moisture content and temperature gradient within grain. The coupled of partial differential equations developed, then solves numerically by ï¬nite difference with altemating direction implicit method algorithm. The dynamic models predict not only humidity and temperature of outlet drying air, but also grain moisture content and temperature. The simulated proï¬les are compared with expenmental data, taken from available literature. The models can describe corn grain drying process in deep -bed dryer. However, the model parameters should be modiï¬ed to get drying characteristic proï¬les that closed to the experimenal data.

UNJUK KERJA REAKTOR PLASMA DIELECTRIC BARRIER DISCHARGE UNTUK PRODUKSI BIODIESEL DARI MINYAK KELAPA SAWIT Yudhistira, Ardian Dwi; Istadi, Istadi
TEKNIK Volume 34, Nomor 2, Tahun 2013
Publisher : Diponegoro University

Biodiesel is one of alternative renewable energy source to substitute diesel fuel. Various biodiesel productionprocesses through transesterification reaction with a variety of catalysts have been developed by previousresearcher. This process still has the disadvantage of a long reaction time, and high energy need. DielectricBarrier Discharge (DBD) plasma electro-catalysis may become a solution to overcome the drawbacks in theconventional transesterification process. This process only needs a short time reaction and low energy process.The purpose of this study was to assess the performance of DBD plasma rector in making biodiesel such as: theeffect of high voltage electric value, electrodes gap, mole ratio of methanol / oil, and reaction time. TheResearch method was using GC-MS (Gas Cromatography-Mass Spectrofotometry) and FTIR (FourierTransform Infrared Spectrofotometry) and then it will be analysed the change of chemical bond betweenreactant and product. So, the reaction mechanism can be predicted. Biodiesel is produced using methanol andpalm oil as reactants and DBD plasma used as reactor in batch system. Then, reactants contacted by highvoltage electric. From the results of this research can be concluded that the reaction mechanism occurs in theprocess is the reaction mechanism of cracking, the higher of electric voltage and the longer of reaction time leadto increasing of product yield. The more of mole ratio of methanol / oil and widening the gap between theelectrodes lead to decreased product yield. From this research, product yield maksimum is 89,8% in the variableof rasio mol metanol/palm oil 3:1, voltage 10 kV, electrode gap 1,5 cm, and reaction time 30 seconds.

Ucapan Terima Kasih kepada Mitra Bebestari (Reviewer) Istadi, Istadi
TEKNIK Vol 35, No 1 (2014): (July 2014)
Publisher : Diponegoro University

Kinetika Reaksi Transesterifikasi Minyak Kedelai Menjadi Biodiesel Menggunakan Katalis Padat Ramah Lingkungan K2O/CaO-ZnO Aribowo, Windarto; Nugroho, Amin; Istadi, I.
TEKNIK Vol 40, No. 3 (2019): Desember 2019
Publisher : Diponegoro University

Katalis padat yang ramah lingkungan K2O/CaO-ZnO memiliki keunggulan untuk proses reaksi transesterifikasi meliputi sifat basa heterogen aktif, kelarutan rendah, kekuatan mekanik yang baik, dan dapat digunakan kembali. Penelitian ini bertujuan untuk mengkaji kinetika reaksi transesterifikasi minyak kedelai menjadi biodiesel menggunakan katalis padat K2O/CaO-ZnO untuk mendapatkan model persamaan laju reaksi heterogen. Kajian meliputi: prediksi mekanisme yang sesuai dengan data eksperimen melalui analisis ketergantungan perubahan laju reaksi terhadap perubahan masing-masing reaktan dan perumusan persamaan akhir laju reaksi. Persamaan laju reaksi yang dihasilkan dapat dipakai untuk perancangan reaktor. Hasil kajian menunjukkan bahwa mekanisme reaksi yang terjadi mengikuti mekanisme Eley-Rideal, dimana metanol yang teradsorpsi pada permukaan katalis bereaksi dengan trigliserida (minyak kedelai) pada fase cairnya menghasilkan biodiesel (fatty acid methyl ester) dan gliserol. Persamaan laju reaksi yang diperoleh digunakan dalam perancangan reaktor sehingga hubungan antara berat katalis yang dibutuhkan dengan konversi trigliserida menjadi biodiesel dan perhitungan volume reaktor yang dibutuhkan dapat dilakukan.

PERMODELAN DAN OPTIMASI HIDROLISA PATI MENJADI GLUKOSA DENGAN METODE ARTIFICIAL NEURAL NETWORK - GENETIC ALGORITHM Istadi, Istadi; Rahmayanti, Dian
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Diponegoro University

Modeling and optimization methods are commonly used, still not able to model and optimize the complexchemical processes non-linear. Hybrid method of Artificial Neural Network-Genetic Algorithm (ANN-GA) isconsidered as an effective method for resolving these problems and obtain optimum conditions globally. Theaim of this study is to develop a modeling and optimization with hybrid ANN-GA methods, which applied inprocess of making glucose from starch hydrolysis. The ANN-GA stategy consists of two steps. In the first step,an ANN-based prosess model is developed. Therefore, the input at ANN model will be optimized using GAtechnique. The optimal values of starch concentration, enzyme concentration, temperature and time with ANNGAmethod were 7,13 % (w/v), 1,47 %(w/v), 40,53ÂºC, and 166,04 min respectively with predicted glucose yieldof 6,08 mg/mL. These result differed from the secondary data (Baskar et al., 2008) which were used RSM. Itwas because R2 values of ANN-GA method was 0,9755. While RSM method was only able to achieved value ofR2 for 0,842. Modeling and optimization with the GA-ANN can be developed and used to obtain the model instarch hydrolysis into glucose and the optimal operating conditions simultaneouosly.

Back-matter and Author Guidelines Istadi, Istadi
TEKNIK Vol 36, No 1 (2015): (Juli 2015)
Publisher : Diponegoro University

PENGARUH SIFAT FISIK DAN STRUKTUR MINERAL BATU BARA LOKAL TERHADAP SIFAT PEMBAKARAN Bayuseno, Athanasius Priharyoto; Sulistyo, Sulistyo; Istadi, Istadi
ROTASI Volume 10, Nomor 2, April 2008
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Tujuan penelitian yang dilakukan adalah mengkaji secara seksama tentang potensi kualitas batubara Indonesia yang diambil dari sumber lokal dan selanjutnya menerapkan prosedur/teknologi penyiapan batubara dalam usaha meningkatkan penyalaan dan pembakaran. Sasaran utama didalam teknologi penyiapan batubara diarahkan pada peningkatan penyalaan (ignition) serta hasil pembakaran yang bersih dengan penurunan emisi karbon dioksida dan belerang. Selanjutnya penelitian ini juga mengkaji tentang prospek pengkayaan (enrichment) batubara dalam proses penyiapan batubara lokal. Metode ini diharapkan dapat menaikkan kecepatan penyalaan dan pembakaran nyala api batubara serbuk. Perubahan sifat fisik dan kimia serta struktur mineral sebelum dan setelah proses penyiapan dianalisa dengan metode XRF untuk komposisi kimia dan diffrakasi sinar-X (XRD) untuk komposisi mineral. Sementara nilai kalor batubara dianalisa dengan Bomb Kalorimeter. Pada dasarnya batubara lokal memiliki kandungan mineral utama seperti kaolinite, quartz, jarosite, illite maupun pyrite. Sementara nilai kalor yang dimiliki batubara lokal berkisar antara 4000 -6000 cal/gr dan LOI untuk empat macam batubara berkisar 97-99%. Sebaliknya pengaruh proses pencucian dengan air tidak meningkatkan nilai kalor batubara yang signifikant. Dilain pihak pelaksanaan penelitian ini juga membuat briket bahan bakar batubara dengan campuran polimer dan molase termasuk prosedur mengkaji tingkat penyalaan batubara. Hasilnya menunjukkan bahwa briket batubara dari campuran polyethelene meningkatkan nilai kalor dan mempercepat pembakaran. Dari penelitian ini dapat disimpulkan bahwa kualitas batubara produk lokal tergolong batubara dengan nilai kalor rendah dan perlu penelitian lanjutan dalam meningkatkan kualitas agar bisa kompetitif dengan produk batubara impor.

Karakterisasi Katalis CaO dan Uji Aktivitas pada Kinetika Reaksi Transesterifikasi Minyak Kedelai Pratigto, Setiarto; Istadi, Istadi; Wardhani, Dyah Hesti
METANA Vol 15, No 2 (2019): Desember 2019
Publisher : Universitas Diponegoro

Penelitian ini akan mengkaji kinetika reaksi transesterifikasi minyak kedelai dengan metanol menggunakan katalis CaO dengan parameter rasio mol reaktan terhadap konversi metil ester yang digunakan untuk menentukan persamaan kecepatan reaksi. Katalis CaO digunakan untuk reaksi transesterifikasi karena memiliki kekuatan basa yang tinggi, ramah lingkungan, kelarutan yang rendah dalam metanol. Kinetika reaksi untuk reaktor batch dihitung saat reaksi berlangsung berdasarkan rejim surface area limited yang menentukan. Tujuan penelitian ini untuk mengetahui bentuk persamaan kecepatan reaksi transesterifikasi minyak kedelai dan metanol menggunakan katalis CaO menurut metode differential reactor. Penelitian dilakukan dengan reaksi transesterifikasi minyak kedelai dan metanol dengan katalis CaO dengan variabel bebas perbandingan mol reaktan. Hasil penelitian mengemukakan metanol teradsorpsi di permukaan katalis dan trigliserida tidak teradsorpsi di permukaan katalis menunjukkan mekanisme reaksi katalitik Eley-Rideal. Persamaan kecepatan reaksi dapat digunakan dalam perancangan reaktor, sehingga hubungan antara konversi trigliserida menjadi biodiesel dengan kebutuhan berat katalis dan volume reaktor yang diperlukan dapat diprediksi.Â This study will examine the kinetics of the transesterification reaction of soybean oil with methanol using a CaO catalyst with the parameters of the mole ratio of reactants to the conversion of methyl esters used to determine the reaction velocity equation. CaO catalyst is used for transesterification reaction because it has high base strength, environmentally friendly, low solubility in methanol. The reaction kinetics for a batch reactor are calculated when the reaction takes place based on a decisive surface area limited regime. The purpose of this study was to determine the shape of the speed equation for the transesterification of soybean oil and methanol using a CaO catalyst according to the differential reactor method. The research was carried out with the transesterification reaction of soybean oil and methanol with a CaO catalyst with a free variable ratio of reactant moles. The results of the study revealed that methanol adsorbed on the surface of the catalyst and triglycerides not adsorbed on the surface of the catalyst showed an Eley-Rideal catalytic reaction mechanism. The reaction speed equation can be used in reactor design, so the relationship between the conversion of triglycerides to biodiesel with the required catalyst weight and the reactor volume required can be predicted.

Pengaruh Laju Molar Mn Larutan Terhadap Mikrostruktur Lapisan Tipis GaN:Mn yang Dideposisi di atas Substrat Si Menggunakan Metode Sol-Gel Sutanto, Heri; Hidayanto, Eko; Nurhasanah, Iis; Istadi, Istadi
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (306.984 KB)

A thin layer of material deposition of GaN: Mn by sol-gel method has done using spin-coating technique. Solution of gallium-citrate-amine maganese-Ga2O3 synthesized using as a source of Ga and Mn MnO2 as the source. Solution varied with the mole fraction solution of 60-80% Mn. Brown crystals that formed subsequently dissolved in ethylenediamine to form a gel. Subsequent gel superimposed on top of Si substrates with a spin-coater at a rate of 1100 rpm. Layers formed at temperatures of 900oC and then disintering in UHP N 2 gas environment to form the decomposition of GaN: Mn. The results of spectral analysis of energy dispersive X-ray (EDX) showed incorporation of Mn into the GaN mole fraction increased with the addition of a solution of Mn in the solution used. EDX Test results show that thin films of GaN: Mn impurity contained carbon (C) up to 36.71%. Image scanning electron microscopy (SEM) a thin layer of GaN: Mn shows in general have been obtained surface roughness (rms) morphology of the layer reaches the order of nanometers up to 24.36 nm. From the results already obtained show that the sol-gel deposition method has been able to produce a thin layer of magnetic semiconductors with a nearly homogeneous surface morphology. Thus the sol-gel method could be developed for alternative methods of deposition of thin layers that are economical and simple. Key words: GaN: Mn, CSD, Thin Layer, Mn incorporation.

Co-Authors Afriadie, Chandra Ajeng Riswanti Wulandari Alqurni, Wais Amalia, Rahma Amin N.A.S. Amin Amin Nugroho Aminuyati Anggun Kurniawan Anindita Indriana Aniyati Khoiriyah Anwar Muttaqien, Anwar Anwaruddin Hisyam Anwaruddin Hisyam Ardian D. Yudhistira Ardian Dwi Yudhistira Aribowo, Windarto Astri Rakhmawati Atanasius Priharyoto Bayuseno Bahrudin, Moh. Bambang Pramudono Bambang Tri Nugroho Bintang Ayu Kalimantini Chusnul Khotimah D. A. Rahmawati D. Intaningrum Daniel Setiyo Nugroho Daniel Setiyo Nugroho, Daniel Setiyo Dian Rahmayanti Didi D. Anggoro Didi D. Anggoro Didi D. Anggoro Didi D. Anggoro Didi Dwi Anggoro Dinara, Daniella Cipta Dini Wulandari Dorothy Hoo Wei Ling Dyah Hesti Wardhani Eko Hidayanto Fachmy Adji Pangestu Setiawan Fajar Astuti Febriansyar, Rosyad Adrian Haniif Prasetiawan Heri Mulyanti Heri Sutanto Herlina Hidayati Iis Nurhasanah Inshani Utami Inshani Utami Karimullah, Suud Sarim Kursius, Catherine M. Kursius, Catherine Mentaya Luqman Buchori M.C.T. Wahyu Utami Maryanto - Muhamad, Theobroma Guntur Nani Harihastuti, Nani New Pei Yee Nofi Marlini Nor Aishah Saidina Amin Nor Aishah Saidina Amin Nor Aishah Saidina Amin P Purwanto Pakpahan, Agnes J. Pakpahan, Andre W. S. Permatasari, Astrid Eka Pratiwi, A. Andini Radisya Purwanto . Purwanto Purwanto Purwanto Purwanto Putut Marwoto Qotrunnada, Novaya Aulia Rahmat Gernowo Ratna Dewi Kusumaningtyas Riyanto, Teguh Roikhatus Solikhah Roikhatus Solikhah Salsabila, Unik Hanifah Salsabilla, Alda Saputra, Roni Ade Sitompul, J. P Slamet Priyanto Suherman Suherman Sulistyo Sulistyo Teguh Riyanto Teuku Irfan Maulana Udin Mabruro Wahyu Ambikawati Wulandari, Ajeng Riswanti

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