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All Journal Agrointek Jurnal Redoks REACTOR : Journal of Research On Chemistry And Engineering SAINTI: Majalah Ilmiah Teknologi Industri
Dwi Kemala Putri
Politeknik ATI Padang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Energy Engineering Industrial & Manufacturing Engineering

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Pengaruh Penambahan Gliserin dan Polivinil Alkohol Terhadap Karakteristik Biofoam dari Kulit Singkong dan Daun Angsana Melysa Putri; Dwi Kemala Putri; Alvernia Putri
REACTOR: Journal of Research on Chemistry and Engineering Vol 2, No 1 (2021): Published in June 2021
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v2i1.19

Abstract

Styrofoam is a petroleum-based and synthetic polymer that is only used once. To reduce waste and environmental damage as well as health problems, this study aims to make biofoam from cassava peel and angsana leaves using a combination of extrusion and baking methods. In this study, glycerin and polyvinyl alcohol were also added with volume variations, 10: 30 (sample 1), 20 : 20 (sample 2), and 30: 10 (sample 3) mL to improve the physical properties of biofoam. The physical characteristics observed were color, water content using the gravimetric method, and water absorption capacity of ABNT NBR NM ISO 535. Sample 1 and sample 2 were lighter in color than sample 3. The lowest water content value was found in sample 2, while sample 2 was has the ability to absorb less water is sample 3.
Potensi Ekstrak Daun Pepaya sebagai Inhibitor Korosi dalam Media Asam Klorida pada Baja ST37 Dwi Kemala Putri; Addin Akbar
REACTOR: Journal of Research on Chemistry and Engineering Vol 2, No 2 (2021): Published in December 2021
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52759/reactor.v2i2.37

Abstract

Corrosion is a decrease in the quality of a metal material caused by a reaction with the environment. Reducing the corrosion rate on steel can be done by adding an inhibitor. Papaya leaf extract (Carica papaya.L) can be used as a corrosion inhibitor by immersion method. The effect of inhibitor on corrosion rate had been studied using weight loss method, potentiodynamic polarization method, and observation of steel surface using photooptic. It was found that corrosion rate decrease with increase concentration of papaya leaves extract. The highest inhibiton efficiency is 87.8% in 0.2 M hydrochloric acid with 2% concentration of papaya leaves extract. Potentiodynamic polarization method showed that papaya leaves extract decrease corrotion current. Inhibiton efficiency reached 81.58% in 2% extract concentration in which corrosion current decrease from 0.0266 mA/cm2 to 0.0049 mA/cm2. Analysis of photooptic showed that there is difference on steel surface corroded in hydrochloric acid with inhibitor and without it.
Density Effect of Calcium Carbonate Solution on Kernel Losses in Clay Bath Unit at PT Bina Pratama Sakato Jaya Addin Akbar; Khairul Akli; Dwi Kemala Putri; Melysa Putri; Syarie Hidayah
JURNAL ILMIAH TEKNOLOGI INDSUTRI (SAINTI) Vol 19, No 2 (2022): VOL 19 NO 2 DESEMBER 2022
Publisher : Politeknik ATI Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (86.422 KB)

Abstract

Clay Bath is a tool to separate palm shells from Kernels using a calcium carbonate solution. Kernel Losses in the Clay Bath unit are a problem that can be detrimental to CPO Processing Industry. The effect of the density of the calcium carbonate solution can reduce the Kernel Losses. In this study, variations in the density of calcium carbonate solution were made starting from 1.092; 1,112 ; 1.136 ; 1.142 ; 1.150 g/mL. Based on the results of the study, the lowest Kernel Losses were found at a density of 1.150 g/mL with 2.57%.
PRE-TREATMENT TANDAN KOSONG KELAPA SAWIT SEBAGAI BAHAN BAKU BIOETANOL DENGAN BANTUAN GELOMBANG MICROWAVE Dwi Kemala Putri; Rosalina Rosalina; Reni Sutri
Jurnal Redoks Vol. 8 No. 1 (2023): REDOKS JANUARI-JUNI
Publisher : Universitass PGRI Palembang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31851/redoks.v8i1.9313

Abstract

Tandan Kosong Kelapa Sawit (TKKS) merupakan limbah perkebunan pengolahan kelapa sawit yang belum banyak dimanfaatkan secara luas. Salah satu pemanfaatan TKKS adalah sebagai bahan baku pembuatan bioethanol. Dalam peroses pembuatan bioethanol, TKKS harus melewati proses pre-treatment terlebih dahulu yang bertujuan untuk memecah lignoselulosa menjadi monomer gula. Proses pre-treatment dilakukan terhadap kandungan lignin, selulosa, dan hemiselulosa dengan menggunakan bantuan gelombang mikro (microwave). Pre-treatment dilakukan dengan penambahan aquadest dan daya microwave sebesar 400W. Perlakukan pre-treatment ini dilakukan dengan 5 variasi waktu yaitu 5”, 10”, 15”, 20”, dan 25”. Metode pre-treatment dengan penambahan gelombang mikro ini dinilai memberikan efek positif yaitu dapat meningkatkan kadar selulosa pada TKKS. Penelitian ini dilakukan dengan pengujian kadar lignin, selulosa, dan hemiselulosa, serta uji kualitatif selulosa sebelum dan sesudah treatment menggunakan XRD. Dari hasil penelitian didapatkan bahwa waktu yang baik dalam proses pre-treatment menggunakan microwave 400 W adalah dengan lama iradiasi 25 menit. Hasil yang didapatkan adalah selulosa 36.87 %, hemiselulosa 36.30 %, dan lignin sebesar 13.74 %.
UNHULLED RICE DRYING RATE IN IMPACT OF ROTARY DRYER ELEVATION ANGLE AND INLET GAS TEMPERATURE Rosalina Rosalina; Gusni Sushanti; Puji Rahayu; Dwi Kemala Putri
AGROINTEK Vol 17, No 2 (2023)
Publisher : Agroindustrial Technology, University of Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/agrointek.v17i2.13968

Abstract

Rotary Dryer is a type of dryer that uses a rotating system to prevail the contact of wet material with hot air. LPG gas is used as a heat source assisted by a blower for air circulation in the Rotary Dryer. Using a drying chamber with a diameter of 25 cm, a length of 135 cm, a rotating speed of 7.5 rotary per second and 8 flights in it. The research method used is a completely randomized design method with variations in the angle of elevation or slope of the Rotary Dryer and the inlet gas temperature of the drying chamber with unhulled rice as raw material. The elevation angle variable used 4 levels, namely 9.16o, 11.84o, 14.47o and 16.19o, while the gas inlet temperature variable has three levels, that are 110oC, 115oC and 120oC. Measurement of moisture content using a wet basis, determining the rate of drying using the graphical integration method. The highest drying rate was obtained for changes in the slope of the Rotary Dryer at the gas inlet temperature of 115oC and a slope of 9.16o as 0.140 kg.H2O/m2.hour. However, from the linear regression equation, the most linear drying rate decrease is at the gas inlet temperature of 110oC with the equation y = -0.0054x+0.1778 with a regression coefficient value of 0.9909 almost 1. The most optimal elevation angle in decreasing water content in all temperature variations is the smallest angle, which is 9.16o with the result that the product water content comply for SNI 6128_2015 standard, which is below 14%.
Co-Authors Addin Akbar Alvernia Putri Gusni Sushanti Khairul Akli Melysa Putri Puji Rahayu Reni Sutri Rosalina Rosalina Syarie Hidayah