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All Journal GEMA TEKNOLOGI
Mohamad Endy Yulianto
Jurusan Teknik Kimia PSD III Teknik, UNDIP Semarang Jl. Prof Sudarto SH, Pedalangan Tembalang, Semarang 50239

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MODEL PERPINDAHAN MASSA SISTEM CAIR-CAIR DALAM TANGKI BERPENGADUK DENGAN PENDEKATAN TEORI LAPISAN FILM

GEMA TEKNOLOGI Vol 15, No 1 (2006): Periode April - Oktober 2006
Publisher : GEMA TEKNOLOGI

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Abstract

Zainal Abidin, Wahyuningsih, Mohamad Endy Yulianto, in paper model of mass transfer system of liquid in churn tank with coat film theory approach explain that Mass transfer in the liquid-liquid phase is an important phenomena in the extraction process. Mass transfer coefficient is one of the factors that influence the rate of mass transfer. Nowadays, in the extraction process of free fatty acid from palm oil with methanol, there’s no data of mass transfer coefficient. The goal of this research was todetermine and develop correlation of mass transfer coefficient on the extraction process of palm oil’s free fatty acid with methanol, as the solvent. Therefore, the research was held in two major steps. The first step was held a liquid-liquid extraction in the laboratory, and the second step was develop an empirical correlation for mass transfer coefficient in the term of dimensionless groups. Batch extraction was conducted in an agitated vessel. The variables that is studied in the process include temperature process, solvent to feed weight ratio, and impeller speed. Based on the data that was obtained from the experiment, the correlation equation that can be used to calculate the mass transfer coefficient was expressed by Sherwood number and could be correlated turbine Reynolds number, Schmidt number, (dp/dT) and (L/S). The result by of Sh = 6,648x10-4 Re0,194 Sc0,333 (dp/dT)0,140 (L/S)0,183The averege deviation of the equation is 9,67 % if it is intended to account for mass transfer coefficient. These dimensionless groups are developed in the range of 3169 to 11750, 6321 to 9897, 0,0007 to 0,0013, and 0,333 to 1 in the Reynolds number, Schmidt number, (dp/dT), and (L/S), respectively.Key words : extraction, mass transfer

MODEL PERPINDAHAN MASSA PROSES STEAMING INAKTIVASI ENZIM POLIFENOL OKSIDASE DALAM PENGOLAHAN TEH HIJAU

GEMA TEKNOLOGI Vol 15, No 1 (2006): Periode April - Oktober 2006
Publisher : GEMA TEKNOLOGI

Show Abstract | Original Source | Check in Google Scholar | Full PDF (80.264 KB)

Abstract

Mohamad EndyYulianto, Didik Ariwibowo, Fahmi Arifan, Heni Kusumayanti, F.S. Nugraheni, Senin, in paper mass transfer model in inactivation steaming process of ocsidase polifenol enzim at green tea processing explain that tea is natural herbs for freshner and maintain body’s heart drinking because it contains catechin the bioactives agent that can prevent cancer, heart failure, myocardial infarction, eases the bowel movement, prevent infection of mouth, gum and so on. Because of it’s the high catechin is needed. The get high catechin the enzymatic oxidation of polifenol must be undergone. For the reason its needed to study an inactivated process of polifenol oxsidase enzyme by steaming. However, this process will depend on mass transfer behavior and pattern of steam penetration into tea leaves. It is effident because of its properties will influence catechin contain in fresh tea leaves. Mass transfer model of inactivation for polifenol oxsidase enzyme in high catechin green tea processing by steamingKey word : mass transfer, steaming, green tea