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All Journal Swara Patra : Majalah Ilmiah PPSDM Migas Khazanah: Jurnal Mahasiswa
Dwita Cahaya Pratiwi
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Evaluasi Kinerja Heat Exchanger 05 (HE-05) Pusat Pengembangan Sumber Daya Manusia Minyak dan Gas Bumi Cepu (PPSDM MIGAS Cepu) Dwita Cahaya Pratiwi
Swara Patra Vol 12 No 2 (2022): Swara Patra : Majalah Ilmiah PPSDM Migas
Publisher : Pusat Pengembangan Sumber Daya Manusia Minyak dan Gas Bumi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37525/sp/2022-2/340

Abstract

The heat exchanger is one of the important units for processing petroleum which acts as a heat exchanger between fluids through solid media. The Cepu Oil and Gas Human Resources Development Center (PPSDM Migas Cepu) itself has five heat exchangers with details of three (HE-01 and HE-02) arranged horizontally and two vertically (HE-03, HE-04, and HE-05). The five HEs have shell and tube types and the same function, namely as a preheater by utilizing heat from the distillation unit before the crude oil enters the furnace. In addition to these uses, the preheater on the HE can also reduce utility costs in the form of using a heater in the production process. This study aims to observe the performance of HE-05 in PPSDM Migas Cepu and determine whether the condition of HE-05 is still considered optimal for operation. Observations were made using a quantitative approach method through the calculation of heat transfer efficiency. The results of the calculation of the efficiency of HE-05 from the residual heat capacity of 85,753 liters/day and 319,853 liters of crude oil/day are 82.52%. This efficiency indicates that heat transfer in heat exchanger 05 is still optimal for operation because it is still above 80%.
OPTIMALIZATION OF UNFEASIBLE RICE TO RICE SUGAR BY HYDROLYSIS METHOD TO ENHACE FARMER WELFARE Dwita Cahaya Pratiwi; Aliya Nurhasanah; Ghea Firsty Nur Madani
Khazanah: Jurnal Mahasiswa Vol. 13 No. 4 (2021): Abstract Proceeding Book: 2st International Conference-Labma Scientific Fair
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/khazanah.vol13.iss4.art26

Abstract

Unfeasible rice is one of the problems in food logistics in Indonesia. This unfeasible rice tends to make farmers or BULOG losers because they have to sell it at a cheaper price or turn it into animal feed. The characteristics of unfeasible rice are many breeds of rice lice, yellow in color, musty smell, and overgrown with fungus. Based on the data, in 100 grams of rice contains 0.1 grams of sucrose (C12H22O11). Sucrose is a double sugar molecule (disaccharide) that can be broken down into simple sugars (monosaccharides) through enzymatic reactions. Monosaccharides are utilized by humans as the main energy source. This shows that rice is not suitable for consumption and can be used as an alternative raw material for making sugar. Therefore, the idea of innovation of rice that is not suitable for consumption was born into sugar. This study aims to determine the enzymatic ratio and the optimum reaction time of the hydrolysis reaction of unfit rice using alpha amylase. So, it is hoped that this research can be used as an initial study to optimize agricultural yields in finding alternative raw materials for making sugar. The method used in this research is the hydrolysis method on rice that has been mashed using the amylase enzyme. Experiments were carried out with variations in the number of enzymes used and the length of time for hydrolysis. The percentages of enzymes used for one kilogram of rice were 0.8%, 0.9%, and 1% with two days of hydrolysis, three days and four days. The optimum results obtained showed that the highest glucose level was 11,769.45 ppm at a ratio of 0.9% w/w enzyme raw material on the fourth day. Keywords: Unfeasible rice, sugar, hydrolysis, amilase enzyme
Co-Authors Aliya Nurhasanah Ghea Firsty Nur Madani