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All Journal LEMBARAN PUBLIKASI MINYAK DAN GAS BUMI Scientific Contributions Oil and Gas
E Jasjfi
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Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Energy Environmental Science

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Pengoptimalan Aktivitas Katalis Perengkah dengan Deaktivasi Uap A.S Nasution; E Jasjfi; Evita H Legowo; Hono Witono
Lembaran Publikasi Minyak dan Gas Bumi Vol. 36 No. 1 (2002): LPMGB
Publisher : BBPMGB LEMIGAS

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Abstract

Proses perengkahan katalitik umpan fraksi berat dan residu melibatkan serentetan reaksi konsekatif, sehingga konversi umpan dengan selektivitas optimal untuk menghasilkan bensin sebagai produk utama dipengaruhi oleh keoptimalan aktivitas katalis perengkah (katalis ekuilibrium). Deaktivasi uap terhadap katalis perengkah baru dapat mengendalikan aktivitas katalis perengkah sampai tingkat optimalnya sehingga produk utama bensin dapat dihasilkan secara optimal dengan suatu konversi umpan rendah. Untuk meneliti aktivitas optimal dari katalis perengkah, telah dilakukan suatu penelitian deaktivasi uap katalis perengkah alumina-silika () pada suhu 500-700°C dan waktu deaktivasi 4-10 jam. Penelitian aktivitas katalis dilakukan dengan memakai alat Micro Activity Test (MAT) dengan umpan standar. Berdasarkan hasil pengamatan aktivitas optimal katalis menghasilkan konversi umpan 36,5% berat dengan produk utama bensin 32,5% berat. Katalis perengkah baru memberikan konversi umpan 45.0% berat, tetapi dengan persentase produk bensin hanya 20,6% berat. Katalis beraktivasi optimal ini memberikan kenaikan selektivitas sebesar 43,27% berat daripada yang dapat dihasilkan oleh katalis baru. Pengaruh deaktivasi uap katalis perengkah dari proses konversi umpan dan produk bensin dari proses perengkahan katalitik dan mekanisme reaksi perengkahan katalitik disajikan dalam makalah ini.
1982 3rd Ascope Laboratories Test Correlation Programme On C.F.R. Engine Bustani Mustafa; E Jasjfi
Scientific Contributions Oil and Gas Vol 6 No 1 (1983)
Publisher : Testing Center for Oil and Gas LEMIGAS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29017/SCOG.6.1.904

Abstract

During the 2nd Workshup on the ASCOPE Laboratory Test Correlation Programme which was, held in Kuala Lumpur 17 - 18 August 1981, the following consensus was reached among participating laboratories : • The frequency of the correlation test programme should be increased to twice a year. • Testing should be carried out at the same day and time specified by the Programme coordinator. • Testing should be carried out according to the same procedure (bracketing Method). Member countries taking part in this correlation programme are Indonesia as coordinator with seven laboratories participating, Malaysia with one laboratory, Thailand and the Philip- pines with two laboratories each. The coordinator in this correlation programme is respon- sible in preparing the correlation samples and sending them by air to each participating laboratory. The first part of this programme (3rd Correlation Programme) was started by sending samples in January 1982 and the second part (4th Correlation Programme) was starting by sending samples in March 1982. It will appear in the next publication. After being tested by the participating laboratories, the test result are to be sent to the coordinator for the determination of the standard deviation and other statistical data. Based on these results, conclusions can be drawn about the deviation of laboratory test results and about outliers to be rejected. For better analysis of the results, for each of the samples for correlation it is also required to report physical and chemical tests such as specific gravity, R.V.P., distillation and lead (TEL) content in the receiving laboratories. This is necessary in order to take into account any possible changes in the sample properties which might have occured during transporta- tion and storage. Also to be observed are ambient and engine operating conditions during the correlation tests. The results of this analysis can then be used as a base for deviations the occurence of outliers and recommendation of remedial steps to be taken. d The method used for testing the samples is the bracketing method, while for rounding the value of the member found during the tests the ASA rules for rounding are used. SADIM The Grubb's rejection criteria with the use of "T" factors is used in evaluating the possible outliers. • Presented by the Indonesian Technical Committee to the Workshop on ASCOPE Laboratory held in Bangkok, Thailand, 9- 11 October 1982.
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 A.S Nasution A.S. Nasution Bustani Mustafa Evita H Legowo Hono Witono