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All Journal Swara Patra : Majalah Ilmiah PPSDM Migas LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI Scientific Contributions Oil and Gas
A.S. Nasution
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Education Energy Environmental Science Mechanical Engineering

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PROSES REFORMASI KATALITIK A.S. Nasution; Oberlin Sidjabat; Abdul Haris; Morina Morina
Swara Patra Vol 1 No 2 (2011): Swara Patra
Publisher : Pusat Pengembangan Sumber Daya Manusia Minyak dan Gas Bumi

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Abstract

Proses separasi minyak bumi adalah proses pertama untuk pemisahan minyak bumi menjadi fraksi-fraksinya. Proses ini meliputi proses distilasi atmosfer dan distilasi vakum, yang menghasilkan nafta, kerosin, distilat vakum dan residu (residu atmosferik dan residu vakum).Dalam rangka meningkatkan nilai tambah fraksi minyak bumi tersebut, maka dilakukan proses tahap kedua, yaitu: konversi, baik berupa proses termal maupun proses katalitik. Bensin mempunyai kisaran titik didih dari 40oC sampai 220oC yang mengandung grup hidrokarbon parafin, olefin, naftena, dan aromatik dengan variasi nilai angka oktananya cukup besar
Efektivitas Katalis Padat Berpori pada Proses Hidrokonversi a.s. Nasution; E. Jasjfi
Lembaran Publikasi Minyak dan Gas Bumi Vol. 40 No. 1 (2006): LPMGB
Publisher : BBPMGB LEMIGAS

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Efektivitas katalis padat berpori pada proses hidrokonversi dipengaruhi oleh ukuran molekul umpan dan ukuran butir katalis- Molekul umpan dan butir katalis, yang berukuran besar dapat menurunkan laju difusi umpan dari fase bulk ke dalam pori katalis sehingga efektivitas katalis tersebut menjadi rendah (F <1)- Penurunan energi aktivasi reaksi dengan katalis berukuran besar menunjukkan suatu indikasi adanya pengaruh laju diffusi umpan dari fase bulk ke dalam pori katalis tersebut.- Efektivitas katalis padat berpori dapat mendekati (F  1), jika kecepatan difusi umpan dari fase bulk ke dalam pori katalis lebih besar daripada kecepatan reaksi umpan pada inti-inti aktif katalis.
Gas Oil Components And The Effects Of The Changing Gas Oil Quality Requirement A.S. Nasution; E. Jasjfi
Scientific Contributions Oil and Gas Vol 21 No 1 (1998)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.21.1.949

Abstract

The survey of gas oil production and impact of more stringent specification on the catalyst performance of ASEAN refineries conducted in 1996 revealed that a total feedstock of 5,673 MBPSD are processed into 1,131 MBPSD gas oil. This consist of the following product distribution: straight-run gas oil 85.44%, thermal cracked gas oil 2.52% cat. Cracked gas oil 3.50% and hydrocracked gas oil 8.54% on total gas oil products. About 50% of this total gas oil is processed in hydrotreating processes to improve the performanceof diesel oil.This paper reviews the production of gas oil components in ASEAN and the effect of the changing gas oil quality requirement on hydrotreating catalyst performance.
Hydroconversion Of Heavy Distillate Into Lube Base Stock Using Bi-Functional Catalysts A.S. Nasution; E Jasjfi
Scientific Contributions Oil and Gas Vol 21 No 2 (1998)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.21.2.956

Abstract

Hydroconversion process replaces the furfural stage and dewaxing part of conventional processs of lube base stock production. To study the ability of this hydroconversion process to weed low viscosity index component out of heavy distillate fraction to produce high viscosity index lube base stock,  an experiment has been carried out on the hydroconversion of three feedstock types, I,e,: non-paraffinic vacuum distillate (NPVD), paraffinic vacuum distillate (PVD) and paraffin-wax (WAX), using three bifunctional catalysts having low, medium abd high acidities. The experiment was done at the following operating conditions: temperature from 380° to 420°C, pressure: 100 kg/cm² and H₂/HC ratio: 1000 L/L using a Catatest Unit operated in continuous system.The experimental data shows that at 50% by wt. feedstock conversion, the yields and viscosity index of lube base stock product are 20.7% by wt. and 118; 25.5% by wt. and 136; and 29.5% by wt. and 164 for NPVD, PVD and high acidity bifunctional catalysts, respectively. By conventional process, PVD feedstock produces 10-15% by wt. lube base stock with viscosity index lube 90 to 100.The high viscosity index of lube base stock product, obtained by hydroconversion process, suggest that a part of condensed aromatics is converted into naphthenes, which are then selectivity hydrocracked into single alkyl aromatics by both the metal site and acid site of the bifunctional catalysts. With medium and high acidity bifunctional catalysts, isomerization and cyclization of wax feedstock into isoparaffins and single ring alkyl-naphthene ring of vacuum distillate feedstock into single ring alkyl-aromatic is quite dominant with medium acidity catalyst.
Co-Authors Abdul Gafar Abdul Haris Chairil Anwar E Jasjfi E. Jasjfi Evita H Legowo Evita H. Legowo Morina Morina Morina Oberlin Sidjabat Rasdinal Ibrahim