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All Journal JURNAL SAINS DAN TEKNOLOGI INDONESIA JURNAL TEKNOLOGI LINGKUNGAN Jurnal Energi dan Lingkungan (Enerlink) Jurnal Teknologi Lingkungan
Yusnitati Yusnitati
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Education Energy Engineering Environmental Science

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PREFACE Yusnitati, Yusnitati
Jurnal Energi dan Lingkungan (Enerlink) Vol 7, No 1 (2011)
Publisher : Jurnal Energi dan Lingkungan (Enerlink)

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Abstract

IDENTIFIKASI PRODUK TURUNAN HYDROPROCESSING MODEL MINYAK SINTETIS BATUBARA MENGGUNAKAN GC-FID/NPD/MS Hanif, Muhammad; Yusnitati, Yusnitati; Nataadmadja, Nasikin
Jurnal Energi dan Lingkungan (Enerlink) Vol 6, No 1 (2010)
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An analysis of identifying a derivative product of liquefied coal modelhydroprocessing was conducted. For that purpose, an integration gaschromatography flame ionization-nitrogen phosphorous detector and massspectrometry (GC-FID/NPD/MS) was used. Hydroprocessing process wasperformed by vibrating micro autoclave tipe batch using Ni-W/Alumina catalystunder initial hydrogen pressure 6 MPa, reaction temperature 375oC and one hourretention time. The analysis result showed that the predominant reaction werehydrogenation, hydrodenitrogenation (HDN) and hydrodeoxygenation (HDO).The HDO of methyl phenol and ethyl phenol took place faster than the otherhydroprocessing reactions such as HDN of quinoline and aromatic hydrogenation(butyl benzene, naphthalene, phenanthrene dan pyrene). This indicates that thehydrogenation reaction or the cleavage of C-O bonding took place very fast thatalkyl could not be detected in the oil. The HDN reaction or the cleavage of C-Ntook place slower but the the nitrogen containing compound vanished faster dueto selective adsorption of the catalyst. However the hydrogenation reaction ofmono-aromatic took place faster than poly-aromaticKata kunci: gas chromatography, identifikasi senyawa, model minyak sintetis
Table of Content Yusnitati, Yusnitati
Jurnal Energi dan Lingkungan (Enerlink) Vol 7, No 1 (2011)
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EFEKTIVITAS PENAMBAHAN NIKEL PADA PENCAIRAN BATUBARA PERINGKAT RENDAH MENGGUNAKAN KATALIS ALAMI LIMONIT Yusnitati, Yusnitati
Jurnal Energi dan Lingkungan (Enerlink) Vol 2, No 1 (2006)
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Abstract

Coal liquefaction of brown coal from South Banko coal was conducted using 5 Lautoclave batch reactor. the effect of nickel addition on the activity of naturallimonite catalyst from Soroako was investigated by comparing the amount ofnickel addition to the reaction.Tthis study showed that original nickel ferritepresent in natural limonite did not play a significant role in increasing the activityof iron compounds in limonite. This study was also pointed out that ironcompound (α-FeOOH) was the major compound for obtaining high oil yield inliquefaction of low rank coal.Kata kunci: liquefaction, low rank coal, nickel ferrite, soroako limonite
PENGEMBANGAN PROSES UPGRADING MINYAK BATUBARA: Pengaruh Temperatur, Tekanan dan Space Velocity Hanif, Muhammad; Faizal, M; Yusnitati, Yusnitati
Jurnal Energi dan Lingkungan (Enerlink) Vol 7, No 1 (2011)
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Abstract

Minyak batubara cair dengan titik didih 70-360oC, diperoleh dari proses pencairan batubara Tanito Harum menggunakan NEDOL Process skala pilot berkapasitas 150 ton/hari. Minyak batubara cair tersebut diupgrade untuk mengklarifikasi pengaruh temperatur reaksi, tekanan hidrogen, dan liquid hourly space velocity (LHSV) terhadap aktifitas hidrodenitrogenasi. Pengujian dilakukan dalam reactor fixed bed kontinyu berdiameter 8.5 mm menggunakan katalis Ni- W/Alumina pada temperatur 300-375oC, tekanan hidrogen 8-12 MPa, LHSV 0.75-3.0 hr-1 dan rasio hydrogen/oil 1000 NL/L. Hasil pengujian menunjukkan bahwa aktifitas hidrodenitrogenasi meningkat dengan peningkatan temperature reaksi dan tekanan hidrogen. Pada tekanan hidrogen 8 MPa, deaktifasi katalis terjadi lebih cepat dibandingkan dengan tekanan hydrogen 12 MPa selama 15 hari waktu operasi. Selain itu, ditunjukkan pula bahwa pada operasi dengan LHSV yang lebih rendah dan tekanan hidrogen yang lebih tinggi akan lebih efektif untuk menurunkan atau menghilangkan senyawa nitrogen dalam proses upgrading minyak batubara cair. Sehingga, operasi pada tekanan hidrogen 12 MPa diharapkan dapat menghasilkan produk minyak batubara cair dengan kandungan nitrogen yang rendah untuk waktu operasi lebih dari satu tahun pada skala komersial. Kata Kunci: hidrodenitrogenasi, katalis Ni-W/Alumina, minyak batubara cair, upgrading
KARAKTERISTIK PROSES HIDROKONVERSI KATALITIK DENGAN BAHAN BAKU BITUMEN Yusnitati, Yusnitati; Hanif, Muhammad; Adiarso, Adiarso
Jurnal Energi dan Lingkungan (Enerlink) Vol 6, No 2 (2010)
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The effects of bitumen types in a hydro-conversion catalytic process to producesyntethic liquid fuels was investigated. Three samples of natural solid bitumenobtained from three different sampling points in Riau Province are used in thisstudy. Preliminary technical feasibility of the natural solid bitumen as a feedstockof synthetic fuel oil using this process is also investigated. Experimental runs arecarried out using a 1 liter stirred batch autoclave reactor under the standardconditions: reaction temperature of 450oC, initial hydrogen pressure of 12 MPafor 1 hour and atomic ratio of sulfur to iron at 2.0. This process condition issimilar to direct coal liquefaction process using heavy oil solvent produced fromBench Scale Unit (BSU) 100 kg/hour input in Takasago, Japan. The resultsindicate that the oil yield increases with the decrease of liquid bottom yield. TotalCO+CO2 and hydrocarbon gases products are almost equal at all bitumensamples. Due to their high ash content, the oil yield (LO, MO and HO) of bitumensamples relatively lower than the oil yield of coal liquefaction process. It was alsofound that O/C and H/C atomic ratio in bitumen samples vary significantly withtheir sampling point, but the H/C ratio of bitumen relatively higher than typicalcoal. The higher of H/C ratio, the easier of bitumen to be converted to syntheticfuel oil and leading to the more efficiently use of gaseous hydrogen. Inconclusion, the natural solid bitumen has a possibility as a feedstock of syntheticfuel oil, if it is fed to the process in the form of a dried-ash-free-bitumen (hyperbitumen).Kata kunci: bitumen, hidrokonversi katalitik, BBM sintetis
PERBANDINGAN KARAKTERISTIK PENCAIRAN BATUBARA BANKO DAN YALLOURN SEBAGAI EFEK DARI PERUBAHAN SUPLAI HIDROGEN Artanto, Yuli; Yusnitati, Yusnitati
Jurnal Energi dan Lingkungan (Enerlink) Vol 4, No 1 (2008)
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Abstract

A comparison of liquefaction characteristic of two brown coals (South Banko andYallourn coals) was studied. A 5L autoclave batch reactor was used under thecondition with temperature at 450 oC , reaction holding time 60 minutes. Theinitial hydrogen pressure was varied to compare the effect of different reactionpressure on the product perolehans. The oil yield for Banko Selatan and Yallournincreased 6% and 18%, respectively, by increasing initial hydrogen pressurefrom 10 MPa to 15 MPa. However in accordance with increasing pressure from15 MPa to 20 MPa, the yield did not change remarkably. On the other hand, theCLB perolehan was significantly decreased for both coals when the pressure wasincreased from 10 to 15MPa. Moreover, the CLB yield was abruptly decreasedwhen the hydrogen pressure drastically change to 20Mpa. It was found that theincreasing reaction pressure only affected to the yield of hydrocarbon gas slightlybut remarkably influenced the CO and CO2 gas production for Yallourn coal butnot for South Banko coal.Kata Kunci: coal liquefaction, south banko coal, yallourn coal, oil yield
PENGARUH WAKTU REAKSI TERHADAP KARAKTERISTIK PENCAIRAN BATUBARA BANKO SELATAN Artanto, Yuli; Yusnitati, Yusnitati
Jurnal Energi dan Lingkungan (Enerlink) Vol 2, No 1 (2006)
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Abstract

Investigation of Limonite for catalyst on South Banko coal liquefaction werecarried out under standard condition which has developed by BPPT.Limonite Soroako is a natural mineral that found at Nickel Mining onSoroako, South Sulawesi. Four samples of limonite was examined using 5Lautoclave at our coal liquefaction laboratory in order to investigate theisactivities to produce high distillate yield at standard condition (450oC, 9MPacold H2). The results showed that limonite SYY-E-MY gave a higher distillateyield than those of other limonite (difference about 10-30%daf coal or%bkta). Further investigations were conducted to compare with othercatalysts: synthetic g –FeOOH and pyrite (FeS2). Again, the activity of limonitS99-E-MY was still superior compared to those of synthetic and pyritecatalysts. The yield difference was about 10-16%daf coal or %bkta).Experiment revealed that the factor of FeOOH critically affected the coalliquefaction reaction to improve the distillate yield and to reduce CLB yield.Besides, the representative of Co metal in the limonite (≥5-10 %bk) couldgive synergism effect with FeOOH to improve the activity of limonite.
FRONT COVER Yusnitati, Yusnitati
Jurnal Energi dan Lingkungan (Enerlink) Vol 7, No 1 (2011)
Publisher : Jurnal Energi dan Lingkungan (Enerlink)

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Abstract

EFEK KATALITIK Natrium-AlO2 PADA PROSES PENCAIRAN BATUBARA TANPA PELARUT HIDROGEN DONOR Artanto, Yuli; Yusnitati, Yusnitati
Jurnal Energi dan Lingkungan (Enerlink) Vol 2, No 2 (2006)
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Abstract

Indonesian brown coal, South Banko coal, was liquefied into oil in the presence ofcarbon monoxide and water using alkali base catalyst, NaAlO2. Liquefaction testwas carried out using microautoclave in the absence of donor solvent. Experimentwas conducted at 365oC and 400oC in order to examine the effect of temperatureon coal conversions.Kata kunci: south banko, brown coal, liquefaction, catalyst, donor solvent
Co-Authors Adiarso Adiarso Adiarso, Adiarso Adiarso, Adiarso Artanto, Yuli Artanto, Yuli Faizal, M Faizal, M Hartiniati Hartiniati M Faizal Muhammad Hanif Muhammad Hanif Murti, Sri Djangkung Sumbogo Murti, Sri Djangkung Sumbogo Nasikin Nataadmadja Nataadmadja, Nasikin Nataadmadja, Nasikin Sri Djangkung Sumbogo Murti Yuli Artanto