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All Journal Current Biochemistry Journal IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)
Rizka Mulyawan
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Biochemistry, Genetics & Molecular Biology Chemistry Education Environmental Science

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Characteristic Study of Biodiesel from Used Cooking Oil using Nipah Skin Ash as a Heterogeneous Catalyst Zainuddin Ginting; Rizka Mulyawan; Meriatna Meriatna; Tata Tirani; Asnadia Asnadia; Luthfi Mughni Anisa Haryono
IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) Vol 8, No 1 (2023): February 2023
Publisher : IJFAC (Indonesian Journal of Fundamental and Applied Chemistry)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24845/ijfac.v8.i1.34

Abstract

One type of renewable alternative energy that has great potential to be developed is biodiesel. Biodiesel is a fuel consisting of a mixture of mono-alkyl esters of long-chain fatty acids made from renewable sources such as vegetable oils or animal fats. Such as vegetable oils or animal fats. One of the vegetable oil products that can be used as feedstock for biodiesel production is used cooking oil. Used cooking oil is used oil. The purpose of this research is to study the characteristics of the effect of catalyst mass, the ratio of used cooking oil mole to methanol mole, and the effect of adding THF 1:1 co-solvent on the purity of biodiesel using heterogeneous catalyst ash derived from Nipah fruit skin calcined at 500°C for 4 hours. The process variables were transesterification reaction time 60, 90, 120, and 150 minutes, a mole ratio of methanol to oil 1:19, 1:21, and 1:23 with the addition of THF: methanol v/v 1:1 co-solvent. Biodiesel properties such as density, viscosity, moisture content, and acid number were evaluated and compared with the Indonesian National Standard (SNI). The characteristics of biodiesel were obtained with a density of 860.2 Kg/m3 and a viscosity of 2.37 mm2/s. They contained 44.14% Palmitic acid and 43.04% Octadecenoic acid (oleic), following the Indonesian National Standard (SNI). The maximum yield obtained was 93.3598% using a mole ratio of oil: methanol 1:23 at 60°C for 120 minutes, TFT 1:1, and 3% catalyst mass. The results obtained in this study indicate that heterogeneous catalysts made from kapok skin can be used to produce biodiesel. Adding TFT co-solvent can increase biodiesel production and methyl ester yield so that high purity is obtained.
Stress Simulation Analysis on 316L Stainless Steel Bone Plate for Biomaterial Applications Ahmad Fikri; Agam Muarif; Rizka Mulyawan; Nursakinah
Current Biochemistry Vol. 10 No. 1 (2023)
Publisher : IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/cb.10.1.3

Abstract

Biomaterial adalah material yang digunakan untuk mengganti struktur biologis yang hilang atau sakit. Material ini harus dapat diterima oleh tubuh. Salah satu biomaterial yang paling banyak digunakan untuk aplikasi bone plate adalah stainless steel 316L. Saat diaplikasikan pada tubuh pasien, material ini akan mendapatkan beban sejajar permukaan. Beban ini merupakan beban yang cukup dominan diterima oleh bone plate stainless steel 316L. Beban yang diterima bone plate stainless steel 316L akan berubah dan bervariasi. Sehingga perlu dilakukan simulasi tegangan degan memberikan gaya tekan pada bone plate stainless steel 316L. Simulasi tegangan dilakukan dengan menggambar dan menganalisis tegangan dengan menggunakan Autodesk Fusion 360. Selanjutnya material tersebut diberikan beban berupa static load mulai dari 150 N sampai 2300 N. Hasil analisis tegangan menunjukkan distribusi tegangan terdapat ditengah dan ujung bone plate. Regangan dan perubahan bentuk menunjukkan peningkatan seiring dengan kenaikan nilai tegangan. Gaya tekan 150 N sampai 600 N merupakan beban yang aman karena masih dibawah titik luluh 170 MPa. Gaya tekan 700 N sampai 2300 N merupakan beban yang tidak aman karena sudah melebihi titik luluhnya. Hal ini akan menyebabkan material mengalami deformasi plastis dan patah.
Co-Authors Agam Muarif Ahmad Fikri Fikri Asnadia Asnadia Luthfi Mughni Anisa Haryono Meriatna Nursakinah Tata Tirani Zainuddin Ginting