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All Journal Jurnal Teknologi Bahan dan Barang Teknik Equilibrium Journal of Chemical Engineering Journal of Applied Sciences, Management and Engineering Technology (JASMET)
Dyah Retno Sawitri
Universitas Islam Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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OPTIMASI KONDISI REAKSI PADA SINTESIS PLASTICIZER DARI METIL OLEAT Dyah Retno Sawitri; Amelia Anjani Harahap; Nurul Harahap
Jurnal Teknologi Bahan dan Barang Teknik Vol 11, No 1 (2021)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37209/jtbbt.v11i1.278

Abstract

Reaksi epoksidasi mengubah ikatan rangkap pada senyawa olefin menjadi ikatan epoksida atau oksiran. Metil ester dari minyak nabati dengan kandungan asam lemak tak jenuh dapat digunakan sebagai bahan baku pada reaksi epoksidasi. Epoksida berbasis minyak nabati memiliki potensi yang besar untuk digunakan sebagai plasticizer untuk pemrosesan polimer. Pada penelitian ini, reaksi epoksidasi dilakukan secara in-situ menggunakan asam asetat, hidrogen peroksida, dan asam sulfat sebagai katalis. Rancangan eksperimen dengan Taguchi digunakan untuk optimasi kondisi reaksi yang meliputi suhu reaksi serta perbandingan molar hidrogen peroksida dan asam asetat terhadap metil oleat. Hasil optimasi menunjukkan bahwa faktor yang paling berpengaruh terhadap yield adalah perbandingan molar asam asetat terhadap asam oleat. Yield maksimum sebesar 79,87% diperoleh pada suhu 60°C dengan perbandingan molar hidrogen peroksida dan asam asetat terhadap metil oleat berturut-turut sebesar 1,6 dan 0,3.
Density Evaluation of Alkyl Ester from Different Types of Alcohol and Vegetable Oil Dyah Retno Sawitri; Khusnul Azzam; Ani Chalwa Isnani; Darryl Al Husein
Equilibrium Journal of Chemical Engineering Vol 9, No 2 (2025): Volume 9, No 2 December 2025
Publisher : Program studi Teknik Kimia UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/equilibrium.v9i2.107798

Abstract

ABSTRACT. Alkyl ester, also known as biodiesel, is an alternative renewable energy source and is produced through the reaction of vegetable oil and alcohol. One of the important characteristics of biodiesel lies in the density value. This study evaluates the density value of alkyl esters from several raw materials. The raw materials used include palm oil and rice bran oil. In comparison, the types of alcohol used include methanol, ethanol, and isopropanol. The density values of palm oil ethyl ester and rice bran oil ethyl ester were measured at 30 – 100°C. The density measurement results were then compared with the simulation results using ASPEN Plus® software. The density of alkyl esters was measured over a temperature range of 30-100°C. The density measurements were then compared with the simulation results using ASPEN Plus® software. The measurement and simulation results showed that the density was higher in the order ethyl > methyl > isopropyl ester for palm oil. When viewed from the vegetable oil, the density of rice bran oil ethyl ester is higher than that of palm oil ethyl ester. The results of measuring biodiesel from rice bran oil and palm oil at 40°C show that only the isopropyl ester has a density that does not meet the quality requirements of biodiesel as defined by the Indonesian National Standard. Keywords:Biodiesel, Density, Palm oil, Rice bran oil 
Energy Analysis of the Refrigeration System and Its Impact on Process Parameter in Shortening Oil Production Hartanto Hartanto; Dyah Retno Sawitri; Sholeh Mamun
Journal of Applied Sciences, Management and Engineering Technology Vol 6, No 1 (2025)
Publisher : Institut Teknologi Adhi Tama Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jasmet.2025.v6i1.7035

Abstract

The food industry continuously evolves to meet the increasing demand for high-quality products such as shortening oil. This study analyzes the performance of refrigeration systems in shortening oil production, focusing on the effects of suction pressure on energy efficiency and product quality. Experimental results demonstrate that increasing the suction pressure from 1,2 bar to 1,6 bar leads to a reduction in cooling capacity (Qe) from 110,08 kJ/kg to 91,36 kJ/kg, heat rejection capacity (Qc) from 137,34 kJ/kg to 122,85 kJ/kg, and the Coefficient of Performance (COP) from 4,04 to 2,90. Despite these declines in system efficiency, the penetration value (Pen.V) of the final product increased from 272 mm/s to 314,4 mm/s, indicating an improvement in the texture of the shortening oil. These findings underscore the critical role of optimizing suction pressure and operational parameters to balance energy efficiency and product quality. The study highlights the importance of maintaining precise control over refrigeration system variables to enhance production sustainability and meet industry standards.
Co-Authors Amelia Anjani Harahap Ani Chalwa Isnani Darryl Al Husein Hartanto Hartanto Khusnul Azzam Nurul Harahap Sholeh Mamun