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All Journal International Journal of Science and Engineering (IJSE) Seminar Nasional Teknik Kimia Kejuangan
Mahreni Mahreni
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Engineering Environmental Science

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ESTER ASAM KARBOKSILAT DAN ISOPROPIL ALKOHOL UNTUK BAHAN DASAR BIOPELUMAS Mahreni Mahreni; Faizah Hadi; Renung Reningtyas; Gemal Kurniawan; Maulana Fahdlurahman Al Abdillah
Prosiding Seminar Nasional Teknik Kimia "Kejuangan" 2017: PROSIDING SNTKK
Publisher : Seminar Nasional Teknik Kimia Kejuangan

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Abstract

ESTERIFICATION OF OLEIC ACID, STEARIC ACID AND ISOPROPIL ALCOHOL FOR LUBRICANT BASE.Uncontrolled spill of petroleum base lubricant has been polluted the environment. An alternative of biodegradable and environmental friendly lubricant is needed to substitute petroleum based lubricant. Biolubricant can be made from plant or animal oil, or synthetic lubricant that meets biodegradability criteria and nontoxic to human and environment. The aim of this research is to produce ester from Oleic acid, Stearic acid and Isopropyl alcohol as a base stock for lubricant. Range of time in reaction was set 3,4, and 5 hour. Stearic acid was varied 11-15 gram, Oleic acid 85- 89 ml, and IPA 10-15 ml. The resulting products of ester were confirmed by FTIR. Kinematic viscosity, Pour point, Freezing pont are evaluated by ASTM analyses. Ester produced from 12 gr oleic acid, 88 ml of oleic acid and 5 mil of IPA at room temperature is still in liquid phase, with kinematic viscosity at 100oCis larger than 4,099 mm2/s, Pour point 24oC and Freezing point = 12oC.This ester is potential to be used as biolubricant base stock.
The Characteristic of Heat Pump Dehumidifier Drier in the Drying of Red Chili (Capsium annum L) Tjukup Marnoto; Endang Sulistyowati; Mahreni Mahreni; M. Syahri
International Journal of Science and Engineering Vol 3, No 1 (2012)
Publisher : Chemical Engineering Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (324.017 KB) | DOI: 10.12777/ijse.3.1.22-25

Abstract

Preservation of agricultural products have a very important to avoid the dropped of selling price when the harvest season arrives. Agricultural products are perishable because of high water content approximately 80 % which if the moisture content above 10% encourages proliferation of spoilage microorganisms in the material and cause the short shelf life. One way that has been done to preserve agricultural products such as red chili is dried using direct sunlight. Weakness of the sun drying can not reduce the water content to below 10% so spoilage microorganisms can live and breed, cause the short self life. Drying using Heat Pump Humidification Technology (HPD) is one solution to overcome the disadvantages of the direct sun drying. HPD can reduce the moisture content up to or below 10% will increase the self life and make easier to crush and to produce a chili powder. The purpose of this study to determine the appropriate mathematical model of the drying phenomena. The constant of the model equations are determined by Sum Square Error (SSE). Before being dried chilies dipped in hot water to remove the wax. PHD is used as an air dehumidifier that circulate in the dryer. Humidity difference causes the displacement of water from the chilies to dry air and lower the moisture content of chili. Moisture content of chili every 5 minutes is analyzed using gravimetric method. The results showed that the texture of the chili is very fragile with a moisture content of less than 10% and in the best conditions, the moisture content of chili is 6:35 wt%. From the research found that the appropriate model is Lewis model and the constant of the models obtained (k = 0.0056). Due to the moisture content of the product below 10 wt%, PHD can be considered as an agricultural product dryer. Keywords — Chili, drying, heat pump, hpd
Co-Authors Endang Sulistyowati Faizah Hadi Gemal Kurniawan M. Syahri Maulana Fahdlurahman Al Abdillah Renung Reningtyas Tjukup Marnoto