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Reaktor
Published by Universitas Diponegoro
ISSN : 08520798     EISSN : 24075973     DOI : https://doi.org/10.14710/reaktor.xx.x.xx-xx
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Materials Science & Nanotechnology
Reaktor invites contributions of original and novel fundamental research. Reaktor publishes scientific study/ research papers, industrial problem solving related to Chemical Engineering field as well as review papers. The journal presents paper dealing with the topic related to Chemical Engineering including: Transport Phenomena and Chemical Engineering Operating Unit Chemical Reaction Technique, Chemical Kinetics, and Catalysis Designing, Modeling, and Process Optimization Energy and Conversion Technology Thermodynamics Process System Engineering and products Particulate and emulsion technologies Membrane Technology Material Development Food Technology and Bioprocess Waste Treatment Technology
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 8 Documents
 1 
Search results for , issue "Volume 11, Nomor 1, Juni 2007" : 8 Documents clear
Pembuatan Kalsium Karbonat Dari Bittern Dan Gas Karbondioksida Secara Kontinyu Soemargono Soemargono; Mu`tasin Billah
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (885.946 KB) | DOI: 10.14710/reaktor.11.1.14-21

Abstract

Kalsium karbonat yang digunakan dalam industry-industri cat, karet dan kertas harus mempunyai mutu yang tinggi, terutama kemurnian dan kehalusannya. Untuk itu, Indonesia masih mendatangkan kalsium karbonat murni dari luar negeri dalam jumlah yang cukup besar. Bittern meruppakan bahan buangan industry garam yang disebut juga air tua, mengandung senyawa kalsium. Karbondioksida biasanya berasal dari hasil pembakaran yang masuk ke udara. Kandungannya di udara kecil, tetapi berpotensi sebagai pencemar. Dengan mereaksikan kalsium yang terkandung dalam bittern dengan CO2 akan membentuk CaCO3 dalam suasana basa. Pembentukan kalsium karbonat dilakuakan dengan proses kontinyu dalam reactor kolom bersekat miring.  Dari hasil penelitian diperoleh bahwa pengendapan magnesium dengan larutan ammonia menyebabkan kandungan kalsium ikut terdegradasi. Hasil terbaik diperoleh pada kondisi pH awal, kecepatan alir gas CO2, kecepatan alir cairan dan suhu masing-masing pada 8,7; 2265 ml/menit; 10 ml/menit, dan 303 K, dengan konversi sebesar 38,40%. Produk berupa CaCO3 yang diperoleh memiliki kemurnian sebesar 21,34%.Kata kunci : kalsium karbonat, bittern, reactor sekat miring
Solid And Liquid Pineapple Waste Utilization For Lactic Acid Fermentation Abdullah Abdullah
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2330.194 KB) | DOI: 10.14710/reaktor.11.1.50-52

Abstract

The liquid and solid pineapple waste contain mainly sucrose, glucose,fructose, and other nutrients. It therefore can potentially be used as carbon source for fermentation to produce organic acid. Recently, lactic acid has been considered to be an important raw material for production of biodegradable lactate polymer, the experiments were carried out in batch fermentation using the liquid and solid pineapple waste to produce lactic acid. The anaerobic fermentation of lactic acis were performed at 40 0C, ph 6, 5% inocolum, and 50 rpm. Initially results show that the liquid pineapple waste by using Lactobacillus delbrueckii can be used as carbon source for lactic acid fermentation. The production of lactic acid are found to be 79% yield, while only 56% yield was produced y using solid waste.Keywords : Lactic acid fermentation, Pineapple waste, Lactobacillus delbrueckii
Distribusi Aliran Dalam Reactor Berkanal Mikro Y. W. Budhi; E. Restiawaty; subagjo Subagjo
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4758.051 KB) | DOI: 10.14710/reaktor.11.1.1-7

Abstract

Reactor mikro telah menempatkan diri pada posisi yang diminati dalam pengembangan teknologi reactor modern yang memiliki karakteristik pokok dalam hal  percepatan laju perpindahan massa dan panas yang berlipat ganda. Dengan dimensi yang berskala mikron, distribusi aliran dari pipa induk menuju masing-masing kanal merupaka salah satu persoalan penting untuk menjamin keseragaman aliran di setiap kanal. Makalah ini mengkaji distribusi aliran dalam lima model reactor dan shift converter yang mengkonversi CO menjadi CO2 agar tidak meracuni katalis dalam sel bahan bakar. Selanjutnya pada model reactor dengan distribusi terbaik, karakteristik cold start up ditelaah lebih mendalam melalui teknik reaksi kimia tak tunak. Hasil studi menunjukkan bahwa start up pada shift converter dapat dilakukan dalam waktu yang sangat singkat yang menunjukkan bahwa secara praktis unit reactor mikro ini dapat diterapkan.Kata kunci : reactor mikro, pemodelan dan simulasi, shift converter, miniaturisasi
Re-ignition of multi-species soot clouds in building fires T. Poespowati; B. Moghtaderi
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6251.7 KB) | DOI: 10.14710/reaktor.11.1.22-29

Abstract

The re-ignition potential of multi-species soot clouds in building fires were investigated  based on their extinction characteristics. The investigation was carried out theoretically using the adaptation of Semenov`s thermal explotion theory. The critical sizes of soot particles in the cloud were found to be strongly effected by  the particle temperature., shape, and reactivity, as the mass fraction of each species, and ambient conditions. The clous shape, cloud particle number density, fuel mass fraction and soot reactivity were identified as the major parameters impacting upon the cloud extinction potential. Our analysis indicate that blending of a base soot with a less reactive soot generally increases extinction potential of the cloud ( i.e. likelihood of extinction) while addition of a more reactive secondary soot to the base one minimizes the probability of cloud extinction.Keywords: extinction, clouds, re-ignition, soot
Fabrication and characterization of polyimide/ polyethersulfone-fumed silica mixed matrix membrane for gas separation A. F. Ismail; T. D. Kusworo
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5912.568 KB) | DOI: 10.14710/reaktor.11.1.30-37

Abstract

This study is performed primarily to investigate the feasibility of fumed silica as inorganic material towards gas separation performance of mixed matrix membrane. In this study, polyimide/ polyethersulfone (PES)-fumed silica mixed matrix membrane were casted using dry/wet technique. The result from the FESEM, DSC and FTIR analysis confirmed that the structure and physical properties of membrane is influenced by inorganic filler. FESEM`s cross-section view indicated good compatibility  between polymer and fumed silica for all of range fumed silica used in this study. The gas separation performance of the mixed matrix membrane with fumed silica were relatively higher compared to that of the neat PI/PES membrane. PI/PES-fumed silica 5 wt% yielded significant selectivity enhancement of 7.21 and 40.47 for O2/N2, and CO2/CH4, respectively.Keywords:  gas separation membrane, mixed matrix membrane, silica
The Study Of Conversion Cpo To Polyol (Polyalcohol) F. S. Budi; z. Abidin
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3780.874 KB) | DOI: 10.14710/reaktor.11.1.8-13

Abstract

Indonesia is the second big CPO producer after Malaysia. The CPO production of Indonesia gradually increases and reaches 8.2 million tones. About two third of it is used to meet the domestic will receive little income. Therefore, it must be converted into the other product, which has the high value. The main component of it is glyceride composed of glycerol  and fatty acid. The glyceride can be converted into polyol (polyalcohol) which is the material in manufacturing polyurethane, cosmetic, lubricant etc. the process of converting of CPO into polyol is called  the hydroxylation. This research aim to study the hydroxylation process of CPO into polyol and to optimize the variable which really affect the hydroxyl number of product. Based on the experiment, the optimum condition of hydroxylation of CPO with the hydrogen peroxide (H2O2) and the formic acid (HCOOH) into polyol is got as follows: temperature 50 0C, composition of reactan 40% and time 2 hours. The polyol produced has the hydroxyl number 148.Keywords : CPO, hydroxylation, polyol
Preparasi dan karakterisasi zeolit dari abu laying batu bara secara alkali hidrotermal Jumaeri Jumaeri; w. Astuti; w. T.P. Lestari
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5614.919 KB) | DOI: 10.14710/reaktor.11.1.38-44

Abstract

Preparasi zeolit dari abu laying batu bara PLTU Suralaya secara alkali hidrotermal telah dilakukan. Preparasi dilakukan terhadap abu laying yang telah direfluks dengan HCl 1M dan tanpa refluks. Larutan NaOH dengan konsentrasi tertentu (1, 2 dan 3 M) dicampur dengan abu laying batu bara dengan rasio 10 ml larutan tiap 1 gram abu laying, ke dalam tabung Teflon 100 ml dalam suatu auto clave stainless-steel. Autoclave kemudian dipanaskan pada temperatur 80-16 0C selama 3 hari. Zeolit sintesis yang dihasilkan selanjutnya diuji secara kualitatif dengan menggunakan spektroskopi inframerah., dan Difraksi Sinar-X. Hasil penelitian menunjukkan bahwa aktivasi abu laying dengan proses alkali hidrotermal dapat material yang mempunyai struktur mirip zeolit (zeolit-like). Produk hidrotermal terdiri dari campuran zeolit ( Zeolit P, Zeolit Y) serta Kristal sodalit dan mulit. Pada temperatur 160 0C, diperoleh zeolit dengan kristalinitas lebih tinggi daripada 100 0C, baik melalui refluks atau tanpa refluks. Karakteristik zeolit yang terbentuk sangat ditentukan oleh kondisi proses, yang meliputi konsentrasi NaOH, waktu dan temperatur.Kata kunci : abu layang batu bara, alkali hidrotermal, preparasi, karakterisasi, zeolit
Optimasi Pembuatan Kitosan Dari Kitin Limbah Cangkang Rajungan (Portunus pelagicus) Untuk Adsorben Ion Logam Merkuri L. H. Rahayu; S. Purnavita
Reaktor Volume 11, Nomor 1, Juni 2007
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3746.215 KB) | DOI: 10.14710/reaktor.11.1.45-49

Abstract

Penelitian ini bertujuan untukmenentukan kondisi optimum  factor suhu dan waktu proses deatilasi dari khitin cangkang rajungan (Portunus pelagicus) menjadi khitosan dan mengetahui pengaruh pH adsorpsi dari kitosan terhadap penurunan jumlah ion merkuri (%). Proses deasetilasi dilakukan dengan memanaskan campuran khitin dengan larutan NaOH 50% (rasio 1:20 b/v) pada suhu 70 0C, 80 0C, 90 0C dan 100 0C dengan waktu proses masing-masing 30, 60, 90 dan 120 menit. Parameter respon adalah derajad deasetilasi khitosan. Hasil penelitian menunjukkan bahwa derajad deasetilasi khitosan tertinggi adalah 79,65% yang dihasilkan pada suhu 90 0C dan waktu proses 120 menit. Khitosan selanjutnya diuji kemampuan adsorpsinya terhadap ion merkuri pada pH 2, 3, 4, 5, dan 6. Hasil uji aplikasi khitosan sebagai adsorben ion logam merkuri menunjukkan bahwa semakin tinggi pH adsorpsi semakin besar penurunan jumlah ion merkuri (%), dimana hubungan keduanya ditunjukkan dengan persamaan y = 7,50x + 26,11.Kata kunci : adsorpsi, cangkang rajungan, deasetilasi, litin, khitosan

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