Article Per Year (5 Year)
p-Index From 2020 - 2025
1.318
P-Index
This Author published in this journals
All Journal Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains
Zuchra Helwani
Unknown Affiliation
Engineering

Published : 60 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 60 Documents
Search
Journal : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

 2   3   4   5   6 
Densifikasi Produk Karbonisasi Pelepah Sawit Menjadi Briket Menggunakan Crude Gliserol Produk Samping Biodiesel Sebagai Filler Arief Maulana Ilham; Zuchra Helwani; Warman Fatra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Palm frond has been utilized only for raw source of animal feed, compost and organic fertilizer in plantation area. Oil palm fronds has calorific value of 17.200 kJ/kg. Calorific value can be enhanced by carbonization followed by densification. By carbonization, the elements of smoke maker is able to be minimalized, so it will produce the green exhaust gases. Biomass densification aims to increase density and decrease handling issue such as storage and transportation. Calorific value of densification product can be enhanced more by adding filler like crude glycerol that has calorific value of 25.932,75 kJ/kg. This research aims to produce bricket using densification form palm fronds, to know the impact of particle size, filler composition and pressing pressure in product forming also to know the resulted calorific value and compressive strength of resulted product. Particle size used were 60, 80 dan 100 mesh. Filler composition used were 90 : 10, 80 : 20 dan 70 : 30. Pressing pressure used were 80, 90 dan 100 bar. Highest calorific value resulted was 27.359 kJ/kg at 100 mesh particle size, filler composition of 90:10 and pressing pressure of 100 bar. Highest compressive strength resulted was 37,2 Kg/cm2 at 60 mesh particle size, filler composition of 90:10 and pressing sressure of 100 bar. The most affecting factor to calorific value and compressive strength are filler composition and pressing pressureKeywords: Densification, Carbonization, Compressive Strength, Calorific Value, Oil Palm Fronds
Bahan Bakar Padat Dari Pelepah Sawit Menggunakan Proses Karbonisasi Dengan Variasi Ukuran Bahan Baku Dan Suhu Qurotullaili Qurotullaili; Komalasari Komalasari; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 4, No 1 (2017): Wisuda Februari Tahun 2017
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Palm frond so far only used as a source of raw materials for animal feed, compost and organic fertilizer in the plantation. Palm frond has a calorific value of 15,184.05 kJ/kg. Utilization of palm frond as main material of solid fuel production with carbonization process can reduce the problem of oil palm plantations waste and can be increased the calorific value of product. The aims of this study is to produce solid fuel from palm fronds by using carbonization process and analyze solid fuel quality from palm frond with variation of raw material size and temperature. Variation of carbonization temperature were 450°C, 500°C and 550°C. Variation of raw material size 1.68 – 2.38 mm (-8 +10 mesh), 0.84 – 1 mm (-16 +20 mesh) and 0.42 – 0.5 mm (-32 +35 mesh). Water content were 3.66 – 4.86%, ash were 9.39 – 16.17%, volatile were 9.45 – 28.60% and fixed carbon were 57.26 – 70.01%. The highest caloric value was 28,410.94 kJ/kg for 550°C of carbonization temperature and 0.42 – 0.5 mm (-32 +35 mesh) of raw material size.Keywords : biomass, caloric value,carbonization, palm frond
Optimasi Proses Pembuatan Arang Batang Sawit Melalui Proses Karbonisasi Menggunakan Response Surface Methodology Mia Afriyenti; Zuchra Helwani; Warman Fatra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5, No 1 (2018): Wisuda April Tahun 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Palm oil trunk until this date is a waste which still not been used maximally, so palm oil trunk have potential to be used as alternative energy resource of solid fuel with the way of increasing its calorific value through carbonization process. Carbonization is converting process of biomass to become charcoal at temperature range 300-600 oC in inert condition. The objective of this research is to study the characteristics of resulted solid fuels. Palm oil carbonization used tube furnace as reactor within operating conditions of temperature (350, 400 and 450 oC), residence time (90, 120 and 150 minutes) and feed size (2, 4 and 6 cm). The analized responses were calorific value and volatile matter content. Obtained result for calorific value amounts 24,426.300-28,929.100 kJ/kg and volatile matter content amounts 8-19 %. The obtained analysis is processed using Design Expert v7.0.0 Trial Version. Processing data begins with using first order to see the degree of curvature. Degree of curvature obtained indicate the model to use is second order. Level of significance between variables can be observed from the value of P-value < 0,05 and lack of fit > 0,05, which indicate that model is suitable with the obtained data. R2 obtained for Y1 = 0.9486 and Y2 = 0.9704. The most influential factors to all responses are carbonization temperature followed with residence time and feed size. At optimum operating conditions (temperature 449,99 °C during 149,96 minutes with feed size 2 cm), the value of optimum responses obtained are Y1= 28.282,2 kJ/kg and Y2 = 9,234 %.Keywords : biomass, carbonization, optimization, palm oil trunk, rsm, solid fuel
Produksi Biodiesel Dari Minyak Sawit Off Grade Menggunakan Katalis Na2O/Fe3O4 Pada Tahap Transesterifikasi Widya Yoesepha; Zuchra Helwani; Edy Saputra
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Palm oil off grade is one of feedstock biodiesel from preparation of over done and decomposed palm oil. This palm oil off grade have >5% free fatty acid composition, therefore need two process to produce biodiesel that is esterification dan transesterification. The purpose of this research is to produce heterogen basic catalyst from iron powder impregnation with Na2O and study the effect of condition process variation. The variation of transesterification process is temperature (50oC, 60oC and 70oC), mole ratio of oil : methanol (1:6, 1:8 and 1:10) and catalyst concentration (1%-wt, 2%-wt and 3%-wt) as long as 3 hours. The result of this research was processed with Response Surface Methodology (RSM) and the number of steps was determined by Central Composite Design (CCD). The highest yield of biodiesel is 79,52% at temperature60oC, mole ratio oil : methanol 1:8 and catalyst concentration 2%-wt. The result showed that the catalyst concentration influencing the yield of biodiesel.Keywords: biodiesel, heterogen catalyst, palm oil off grade, response surface methodology, transesterification
Pemanfaatan Gliserol Produk Samping Biodiesel Menjadi Triacetin Melalui Proses Esterifikasi Menggunakan Katalis Fly Ash Nur Khairiati; Zuchra Helwani; Khairat Khairat
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 1 (2016): Wisuda Februari Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Glycerol is a by-product of biodiesel that produced 10% of the total volume of biodiesel products. Glycerol can be processed into economic product such as triacetin . Triacetin made by estherification process of glycerol and acetic acid with the aid of flya ash as catalyst. This study aims to determine the characteristics of the catalyst fly ash and determine the influence of process variables (concentration of catalyst, reactant mole ratios and estherification time) on glycerol conversion. Catalyst concentration used were 1%, 2% and 3%. The mole ratio of glycerol: Acetic acid were 1:5, 1:7 and 1:9. Estherification time used were 1. 2 and 3 hours. Characteristic of fly ash catalyst such as surface area, the acidity and degree of crystallinity increased after activation. The highest conversion obtained was 53,33% at the operating conditions of catalyst concentration 3%, the mole ratio of reactant 1:9 and estherification time 3 hours. The increasing of catalyst concentration, mole ratio of reactant and estherification time increased the conversion of glycerol.Keywords: biodiesel, estherification, fly ash, glycerol, triacetin.
Pembuatan Komposit Serat Campuran Tandan Kosong Sawit (TKS)/E-Glass Matriks Epoxy Dengan Metode Hand Lay-Up Rivo Fernando; Warman Fatra; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 6 (2019): Edisi 2 Juli s/d Desember 2019
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Empty Fruit Bunch (EFB) is one of the palm oil plantation waste that has not been utilized optimally. EFB fiber has a good strength, low density, and it can be used for substituting synthetic fiber composite. However, the strength of EFB fibers is lower than that of synthetic fibers. In addition, EFB fibers also have a poor interface with the matrix and relatively high water absorption. Several methods can be used to increase the bonding strength between the fibers and matrix, alkaline treatment and the addition of coupling agent into the matrix. One of the coupling agent is Maleated Natural Rubber (MNR). The objective of this research is to investigate the effect of the ratio of EFB /E-Glass fibers, ratio of hybrid fibers and matrix as well as the addition of MNR on tensile strength, flexural strength and water absorption of EFB/E-Glass epoxy hybrid composite. The highest tensile strength (77.254 MPa) was obtained in the composition of 40% EFB fiber, 60% matrix and 9% MNR. The highest flexural strength (147.446 MPa) was obtained in the composition of 33.18% EFB fiber, 50% matrix and 10% MNR. The lowest water absorption (4.46%) was obtained in the composition of 40% EFB fiber, 40% matrix and 11% MNR. The results show that the tensile strength increases with the addition of EGlass. While the addition of the matrix and MNR does not significantly affect tensile strength. Flexural strength increases with increasing number of E-Glass and matrix. Keywords: Empty Fruit Bunch (EFB); Hybrid Reinforce; Alkaline Treatment; coupling agent; Maleated Natural Rubber (MNR)
Torefaksi Batang Sawit : Pengaruh Kondisi Proses Terhadap Nilai Kalor Produk Torefaksi Monika Shecilia; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 3, No 2 (2016): Wisuda Oktober Tahun 2016
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Oil palm trunk can be used as alternative energy source by torrefaction process. Torrefaction is a treatment process of biomass into solid fuel by heating within temperature range of 200-300oC in an inert environment. This research aims to result solid fuel from oil palm trunk through torrefaction, to study the effect of process variabel interaction and to study the characteristic of solid fuel resulted. Torrefaction of oil palm trunk was using fixed bed horizontal reactor with temperature (225-275oC), time (15-45 minutes) and nitrogen flow rate (50-150 ml/min). Responses resulted was calorific value and the result obtained for calorific value was 17.908 – 21.800 kJ/kg. The most affecting factor significantly towards the responses was temperature of torrefaction that followed by time and nitrogen flow rate. In optimum condition (temperature of 240,53°C for 15 minutes with nitrogen flow rate of 50 ml/menit) was obtained the optimum value of response for calorific value by 19.180,54 kJ/kg.Keywords: oil palm trunk, response surface methodology, solid fuel, torrefaction.
Studi Polimerisasi Ester Dari Asam Lemak Sawit Distilat (ALSD) Menggunakan Inisiator Benzoil Peroksida 0,4 % Fitra Annisa; Zuchra Helwani; Bahruddin Bahruddin
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Palm Fatty Acid Distillate (PFAD) is a byproduct from palm oil processing industry that used as raw material for synthesis polyester based vegetable oil. The purpose of the research is to study polymerization reaction of ester from PFAD using inisiator benzoyl peroxide 0,4%. There are three step reaction in this research that was esterification, polymerization, and polyesterification. The esterification stage was done at temperature 70oC, reaction time 2 hours, reactant ratio 1:8 (ALSD : metanol), and concentration catalyst H2SO4 1% (w/w) ALSD. Polymerization stage was done at variation of temperature 120, 130, and 140oC and variation reaction time 3, 4, and 5 hours using initiator benzoyl peroxide 0,4% (w/w) methyl ester. Polyesterification stage was done at temperature 175-200oC, reaction time 4 hours, and ratio reactant 1:1 (polymerized methyl ester : ethylene glikol). Product was analyzed by using FT-IR, GC-MS, and viscosity. The result of FT-IR showed that vinyl group was presence who indicated double bonding was presence and polymerization was not occur. The result of GC-MS showed there had no change of molecular weight. And product with temperature 130oC and reaction time 5 hours has higher viscosity value.Keyword : benzoyl peroxide, esterification, PFAD, polymerization
Sintesis Hidroksiapatit melalui Precipitated Calcium Carbonate (PCC) dari Cangkang Kerang Darah dengan Metode Hidrotermal Pada Variasi pH Dan Suhu Operasi Wahyu Syafrima; Zuchra Helwani; Zultiniar Zultiniar
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 2, No 2 (2015): Wisuda Oktober Tahun 2015
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hydroxyapatite Ca10(PO4)6(OH)2 is a calcium phosphate compound which is a bioactive ceramic material with high bioafinitas. Hydroxyapatite (HAp) materials used as bone implants, adsorbents and catalysts. Synthesis of hydroxyapatite can be made by using material which is rich of CaCO3 like PCC blood calm shell with a composition of 95.5% CaCO3. In this research, PCC blood calm shell which has calcium source was synthesized to HAp by hydrothermal process. pH of the reaction (10, 11, 12) and reaction temperature (140oC, 160oC, 180oC) was be varied. The outcome of synthesis was characterized by using FTIR, XRD, SEM. The results of FTIR analysis, synthesis of HAp with hydrothermal method showed the formation of hydroxyapatite in the presence of peaks PO43- dan OH-. The highest peak is obtained at pH 10 at reaction temperature of 140oC, 160oC and 180oC. XRD diffraction results in hydroxyapatite get the highest crystallinity obtained at pH 10 at temperature of 180oC with a hexagonal crystal structure and produce a more pure hydroxyapatite. SEM results showed morphology with clots and irregular round shape.Keywords : PCC blood calm shell, pH, temperature, hydroxyapatite, hydrothermal method.
Pengaruh Kadar Asam Stearat,Mercaptodibenzothiazyldisulfide (MBTS) Dan Sulfur Terhadap Sifat Dan Morfologi Thermoset Rubber Dengan Filler Carbon Black-Abu Terbang Sawit Mery Christina; Bahruddin Bahruddin; Zuchra Helwani
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 2 (2014): Wisuda Oktober Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Crude palm oil wastes in the form of fly ash is potentially use as filler for thermoset rubber because it contains silica. This study aims to increase the mechanical and morphological properties of thermoset rubber which filled with mixture of carbon black and fly ash with particles size screened to 700-800nm. Stearic Acid, MBTS and sulfur contents were used 1; 2; 3 phr (per hundred rubber), 0.5; 1; 1.5 phr and 0.5; 1.5; 3 phr respectively. Rubber mastication process performed by a roll mill at room temperature and roll speed of 20 rpm until the texture is smooth and soft, then added minarex as a plasticizer, nanofiller, and other additives, such as ZnO as an activator, stearic acid as a co-activator, as antidegradant TMQ, MBTS as an accelerator and sulfur as a curative agent. Rubber mastication performed by a roll mill at room temperature and roll speed of 20 rpm. The overall duration of the manufacture of compound ±45 minutes. Vulcanization process using a hot press at a pressure of 200 kgf/cm2 and a temperature of 150 oC. Results showed that increased levels of stearic acid, MBTS and sulfur  is directly proportional to the tensile strength,  but yield elongation at break are varied. The best thermoset rubber in this study were obtained on samples having content of  stearic acid 3 phr, MBTS 1.5 phr and sulfur 3 phr with tensile strength values 19,05 MPa, 774.394 % elongation at break, hardness 52±5 shore A, abration 0,074 mm3/kg and 1,28% water absorption percentage. Keywords: carbon black, natural rubber, palm oil mill fly ash, vulcanizate
Co-Authors Abdullah Syafi’i Adi Maulana Putra Ahmad Fadli Al Qohyum Fernando Andi Mulya Adha Andreas Sahat Parsaulian Andry Sutanto Anna Apryana Ari Wibowo Harahap Arief Maulana Ilham Arini Puspita Ramadhanti Ayu Naluri Bahruddin Bettry Rifani Dedi Meier Silaban Delvi Yolanda Desi Ivo Andri Ari Desly Fadilla Simbolon Dwi Yuni Ernawati Edi Susanto Edy Saputra Eferius Mendrofa Febrian Adhitya Febryanto Febryanto Firman Tampubolon Fitra Annisa Ganis Kharisma Wiranti Gusti Ayu Nurjanah Hari Rionaldo Heriza Saputri Heru Kristianto Holyness Nurdin Singadimedja Ida Zahrina Jhon Fery Marihot Tua S Jimmy Anderson Khairat Khairat Komalasari Komalasari M. Wahyu Nugraha Mery Christina Mia Afriyenti Mohd Fajri Amrullah Monika Shecilia Muh. Fadlan Alfuadi Muhammad Gus Iqbal Al-Pakningi Muhammad Rahman Muhammad Rifki Aulia Rahman Mustapa Ardi Nirmala Sari Nur Khairiati Qurotullaili Qurotullaili Ramdhani Asywal Ricfan Anggriawan Rina Maryenti Rio Nanda Novendra Rivo Fernando Romie Jhonnerie Romy Romy Rozanna Sri Irianty Sherly Oktarizona, Shinta Anggraini Silvia Reni Yenti Solly Aryza Sri Helianty Syafrima Wahyu SYAIFUL BAHRI Trisuciati Syahwardini Triyana Defi Vandhe Melsa Sembiring Viqrie Wahyudi Walter Valentino Sinaga Warman Fatra, Warman Wenny Susanty Widya Yoesepha Yelmida Azis Z Zulfansyah Zultiniar Zultiniar