Mohammad Nasikin
Departemen Teknik Kimia, Fakultas Teknik, Universitas Indonesia, Depok, 16424, Indonesia

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KAJIAN TEKNIS FROUDE NUMBER (Fn) UNTUK PENENTUAN KECEPATAN DINAS KAPAL EKONOMIS PADA KAPAL IKAN TRADISIONAL TIPE BATANG Nasikin, Mohammad; Hadi, Eko Sasmito; Budiarto, Untung
Jurnal Teknik Perkapalan Vol 1, No 2 (2013): April
Publisher : Diponegoro University

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Abstract

Kapal yang digunakan oleh nelayan untuk melaut masih menggunakan kapal ikan tradisional yang belum memiliki perhitungan dan masih dibuat secara turun temurun berdasarkan pengalaman membangun kapal ikan. Penelitian ini bertujuan untuk menghitung tahanan total (Rt), menghitung nilai Froude number (Fn) dan pengaruhnya terhadap nilai konsumsi bahan bakar dengan variasi kecepatan kapal ikan tradisional. Penyelesaian penelitian ini menggunakan software pendukung perkapalan seperti Delftship. Penelitian ini pada analisanya membuat pemodelan yang mewakili kapal sebenarnya. Setelah permodelan langkah selanjutnya adalah menganalisa tahanan, menghitung nilai Froude number (Fn) dan konsumsi bahan bakar. Hasil perhitungan didapat nilai tahanan total (Rt) terkecil pada lunas 11 meter sebesar 3.20 KN dan nilai (Rt) terbesar pada lunas 16 meter sebesar 5.37 KN, nilai tahanan terjadi pada kecepatan 7.50 knot. Pengaruh perubahan nilai Froude number (Fn) terhadap konsumsi bahan bakar paling irit pada kapal lunas 11 meter dengan kenaikan nilai (Fn) 0.30 – 0.40 perubahan kenaikan nilai konsumsi bahan bakar sebesar 6,21 liter/jam. Nilai terbesar ditunjukan pada kapal lunas 15 meter dengan kenaikan nilai (Fn) 0.30 – 0.40 kenaikan konsumsi bahan bakar sebesar 23,53 liter/jam.
PEMBUATAN CMC DARI SELULOSA ECENG GONDOK DENGAN MEDIA REAKSI CAMPURAN LARUTAN ISOPROPANOL-ISOBUTANOL UNTUK MENDAPATKAN VISKOSITAS DAN KEMURNIAN TINGGI Pitaloka, Alia Badra; Hidayah, Nur Anis; Saputra, Asep Handaya; Nasikin, Mohammad
JURNAL INTEGRASI PROSES Volume 5, Nomor 2, Juni 2015
Publisher : JURNAL INTEGRASI PROSES

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Abstract

Eceng gondok (Eichhornia crassipes) merupakan gulma perairan yang dapat mengganggu ekosistem air.Untuk mengurangi dampak negatif yang ditimbulkan berbagai upaya telah dilakukan dan salah satunya adalah dengan pemanfaatan eceng gondok sebagai bahan bakupembuatan Carboxymethyl Cellulose (CMC).Potensi eceng gondok sebagai bahan bakuCMC cukup besar karena kandungan selulosanya yang cukup tinggi. Proses pembuatan CMC ini diawali dengan isolasi selulosa eceng gondok. Selulosa yang dihasilkan kemudian dialkalisasi dengan menggunakan larutan NaOH 10% b/v dan 35% b/v. Tahap berikutnya adalah reaksi karboksimetilasi antara alkali selulosa  dan natrium monokloroasetat (NaMCA, ClCH2COONa) dalam suatu media reaksi. Pada penelitian ini digunakan campuran larutan isopropanol dan isobutanol sebagai media reaksi dengan variasi komposisi. Dari hasil penelitian diperoleh CMC dengan kondisi optimum pada konsentrasi NaOH 10% dengan nilai derajat substitusi (DS) tertinggi sebesar 1,49pada komposisi isopropanol-isobutanol 20:80 (v/v), kemurnian tertinggi 90,9% pada komposisi isopropanol-isobutanol 80:20 (v/v), dan viskositas tertinggi 157,5 cPpada komposisi isopropanol-isobutanol 50:50 (v/v).
Utilization of Bagasse Cellulose for Ethanol Production through Simultaneous Saccharification and Fermentation by Xylanase Samsuri, M; Gozan, Misri; Mardias, R; Baiquni, M; Hermansyah, Heri; Wijanarko, Anondho; Prasetya, Bambang; Nasikin, Mohammad
Makara Journal of Technology Vol 11, No 1 (2007)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v11i1.122

Abstract

Bagasse is a solid residue from sugar cane process, which is not many use it for some product which have more added value. Bagasse, which is a lignosellulosic material, be able to be use for alternative energy resources like bioethanol or biogas. With renewable energy resources a crisis of energy in Republic of Indonesia could be solved, especially in oil and gas. This research has done the conversion of bagasse to bioethanol with xylanase enzyme. The result show that bagasse contains of 52,7% cellulose, 20% hemicelluloses, and 24,2% lignin. Xylanase enzyme and Saccharomyces cerevisiae was used to hydrolyse and fermentation in SSF process. Variation in this research use pH (4, 4,5, and 5), for increasing ethanol quantity, SSF process was done by added chloride acid (HCl) with concentration 0.5% and 1% (v/v) and also pre-treatment with white rot fungi such as Lentinus edodes (L.edodes) as long 4 weeks. The SSF process was done with 24, 48, 72, and 96 hours incubation time for fermentation. Variation of pH 4, 4,5, and 5 can produce ethanol with concentrations 2,357 g/L, 2,451 g/L, 2,709 g/L. The added chloride acid (HCl) with concentration 0.5% and 1% (v/v) and L. edodes can increase ethanol yield, The highest ethanol concentration with added chloride acid (HCl) concentration 0.5% and 1% consecutively is 2,967 g/L, 3,249 g/L. The highest ethanol concentration with pre-treatment by L. edodes is 3,202 g/L.
Cetane Number Booster Additive for Diesel Fuel Synthesized from Coconut Oil Nasikin, Mohammad; Arbianti, Rita; Azis, Abdul
Makara Journal of Technology Vol 6, No 2 (2002)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v6i2.50

Abstract

To reduce NOx, SOx, HC, and particulates that produce because of using diesel fuel, can be done by increasing cetane number. One of methods is adding an additive to diesel fuel. 2-Ethyl Hexyl Nitrate (2-EHN) is a commercial additive that an organic nitrate. Making an additive in this research is used palm oil by nitration reaction that used HNO3 and H2SO4. Result of this reaction is methyl ester nitrate that has a structure looks like 2-EHN. IR spectra from research show that methyl ester nitrate is indicated by spectrum NO2 at 1635 cm-1. This result show that methyl ester nitrate can be synthesized by nitration reaction and yield is 74,84% volume. Loading 1% methyl ester nitrate to diesel fuel can increase cetane number from 44,68 to 47,49.
Role of K3-xHxPW12O40 as a Catalyst in Selective Catalysis of Methylamine Synthesis from Ammonia and Methanol Nasikin, Mohammad
Makara Journal of Technology Vol 7, No 3 (2003)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v7i3.73

Abstract

Synthesize of methylamine from methanol and ammonia was studied in this research work using a partially potassium heteropoly salt (K3-xHxPW12O40 abbreviated as KPW) as a catalyst. KPW was prepared from heteropoly salt and potassium carbonate by using ion exchange method. The reaction was conducted at 600 ~ 800K and at the atmospheric pressure. Reactor used was a continue flow reactor with W/F=0,1~0,9g-kat.mnt./cc.Concentration of reactants and products were analyzed by gas chromathography while catalyst structure was observed by XRD (X-ray diffraction). Isothermal adsorption method was used for determining catalyst pore size. The result showed that ion exchange between H ion in zeolit with K ion produced potassium heteropoly salt that caused the change of interstitial space. The change of interstitial space was observed by the change of the lattice constant of the catalyst crystal. Trimethylamine(TMA) has molecule size smaller than catalyst pore size but bigger than molecular size of Dimethylamine (DMA) and Monimethylamine (MMA). This phenomenon caused the suppression of TMA formation. KPW has a rigid crystal structure and stabil during reaction. On the other hand, crystal structure of a non selective catalyst (NH4)3PW12O40 was not rigid and its pore size is easy to change depending on the product molecule size.
The Effect of Ca Content on CaO-Zeolite on Nitrogen Adsorption Capacity Nasikin, Mohammad; Utami, Tania Surya; Siahaan, Agustina
Makara Journal of Technology Vol 6, No 2 (2002)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v6i2.47

Abstract

In industry, Ca zeolite is used as nitrogen selective adsorbent with the use of PSA (Pressure Swing Adsorption)/VSA (Vacuum Swing Adsorption) methods. Natural zeolite modified to be Cao-zeolite by ion exchange process using Ca(OH)2. Adsorption test was done on CaO-zeolite with different Ca concentration to understand how its adsorption phenomena on oxygen and nitrogen. Adsorption test has been done for CaO-zeolite with Ca concentration = 0,682%, 0,849% and 1,244% to oxygen and nitrogen with equal concentration seperately. Pressure variation has being done three times (5 minutes long each time) adsorption time to analyze the connection between adsorption time and how many moles of nitrogen and oxygen being adsorbed. Adsorption test showed that there is a limit of Ca concentration to make CaO-zeolite more selective to adsorb nitrogen. CaO-zeolite with Ca concentration . 1,125% adsorb nitrogen more selective than oxygen. Because the nitrogen content in air is four times the oxygen so we can conclude that the air adsorption rate by zeolite will be four times the adsorption rate by oxygen. This differences in adsorption rate will make the use for CaO-zeolite as a oxygen enrichment equipment possible.
Modelling and Simulation of Packed Bed Catalytic Converter for Oxidation of Soot in Diesel Powered Vehicles Flue Gas Nasikin, Mohammad; Wulan, Praswasti; Andrianty, Vita
Makara Journal of Technology Vol 8, No 3 (2004)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v8i3.89

Abstract

Diesel vehicle is used in Indonesia in very big number. This vehicle exhausts pollutants especially diesel soot that can be reduces by using a catalytic converter to convert the soot to CO2. To obtain the optimal dimension of catalytic converter it is needed a model that can represent the profile of soot weight, temperature and pressure along the catalytic converter. In this study, a model is developed for packed bed catalytic converter in an adiabatic condition based on a kinetic study that has been  reported previously. Calculation of developed equations in this model uses Polymath 5.X solver with Range Kutta Method. The simulation result shows that temperature profile along catalytic converter increases with the decrease of soot weight,  while pressure profile decreases. The increase of soot weight in entering gas increases the needed converter length. On the other hand, the increase of catalyst diameter does not affect to soot weight along converter and temperature profile, but results a less pressure drop. For 2.500 c diesel engine, packed bed catalytic converter with ellipses cross sectional of 14,5X7,5 cm diagonal and 0,8 cm catalyst particle diameter, needs 4,1 cm length.
Biogasoline Production from Palm Oil Via Catalytic Hydrocracking over Gamma-Alumina Catalyst Wijanarko, Anondho; Mawardi, Dadi; Nasikin, Mohammad
Makara Journal of Technology Vol 10, No 2 (2006)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.7454/mst.v10i2.112

Abstract

Bio gasoline conversion from palm oil is an alternative energy resources method which can be substituted fossil fuel base energy utilization. Previous research resulted that palm oil can be converted into hydrocarbon by catalytic cracking reaction with γ-alumina catalyst. In this research, catalytic cracking reaction of palm oil by γ-alumina catalyst is done in  a stirrer batch reactor with the oil/catalyst weight ratio variation of 100:1, 75:1, and 50:1; at suhue variation of 260 to 340oC and reaction time variation of 1 to 2 hour. Post cracking reaction, bio gasoline yield could be obtained after 2 steps batch distillation. Physical property test result such as density and viscosity of this cracking reaction product and commercial gasoline tended a closed similarity. According to result of the cracking products density, viscosity and FTIR, it  can conclude that optimum yield of the palm oil catalytic cracking reaction could be occurred when oil/catalyst weight  ratio 100:1 at 340 oC in 1.5 hour and base on this bio gasolines FTIR, GC and GC-MS identification results, its  hydrocarbons content was resembled to the commercial  gasoline. This palm oil catalytic cracking reaction shown 11.8% (v/v) in yield and 28.0% (v/v) in conversion concern to feed palm oil base and produced a 61.0 octane numbers biogasoline.
Synergistic Corrosion Inhibition Effect of Rice Husk Extract and KI for Mild Steel in H2SO4 Solution Pramudita, Marta; Sukirno, Sukirno; Nasikin, Mohammad
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (SCOPUS and Web of Science Indexed, December 2019)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.14.3.4249.697-704

Abstract

The corrosion inhibition of rice husk extract for bio-corrosion in mild steel in 1 M of H2SO4 solution and the effect of adding potassium iodide were investigated using the weight-loss method with a variable solution temperature and various bio-inhibitor concentrations. The addition of potassium iodide can significantly increase the efficiency of rice husk extract. The highest efficiency is 95.89% at 1,250 ppm of inhibitor concentration at a temperature of 313 K. The inhibition efficiency of rice husk extract is synergistically increased with the addition of potassium iodide. The characteristics of the adsorption inhibitors were assessed using the Langmuir isotherm adsorption approach at all studied concentrations and temperatures. The synergy of rice husk extract and potassium iodide was examined using thermodynamic and kinetic parameters. Copyright © 2019 BCREC Group. All rights reserved 
SYNTHESIS OF CUMENE (ISOPROPYL BENZENE) FROM ROSIN OIL THROUGH CRACKING AND DEHYDROGENATION Savitri, -; Nasikin, Mohammad; Rinaldi, Nino; Ramdani, Dadi
Teknologi Indonesia Vol 36, No 3 (2013)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (16.051 KB) | DOI: 10.14203/jti.v36i3.212

Abstract

Cumene has been synthesized from rosin oil through cracking and dehydrogenation reactions using modified HZSM-5 catalyst. The research has successfully modifi ed the zeolite-based solid acid catalyst by adding Cu-Niand Ni-Mo metal as promoter. Modifi ed HZSM-5 catalysts were characterized using gravimetry and FTIR-pyridine method, and the result showed that the acidity of the catalyst was decreased. Catalyst activity test for cracking anddehydrogenation reactions were carried out to obtain condition of cumene production. The fi nal products were analyzed using GC-MS. Cu-Ni/HZSM-5 catalyst was suitable for the cracking-dehydrogenation reactions of rosinoil to produce cumene with process conditions of 30 bar and 450oC.