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All Journal Mesin JKPK (Jurnal Kimia dan Pendidikan Kimia)
Johnner P Sitompul
Department of Chemical Engineering, Bandung Institute of Technology (ITB)
Chemical Engineering, Chemistry & Bioengineering Chemistry Mechanical Engineering

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PEROLEHAN SILIKAT DARI ABU SEKAM PADI DALAM SPOUTED-BED: EFEK PERPINDAHAN MASSA Sitompul, Johnner P; Wanadri, Agus
Mesin Vol 11, No 2 (1996)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (428.644 KB)

Abstract

A 5 cm diameter spouted-bed reactor has been applied for solid-liquid reaction, paddy ash and NaOH producing Na-silicate. Hydrodinamics of spouted-bed reactor was studied by using paddy ash-water system. Correlation for minimum superfisial spouting (Ums) was determined and follows the equation. ( in cgs unit)The spouted bed (SB) operates under transition regime i.e. Reynold number particle range 7-25 or Re number fluid ranging from 19 to 254. The mass transfer is the controlling step for this system as for all solid-liquid reactions are very fast. So, a model of mass transfer has been derived and mass transfer correlation in SB follows equations Sh = 191,34 + 0,6325 Sc0.35 Re1.89 Above correlation shows high mass transfer at stagnant fluid compared to other mass transfer correlations which is due to reacting system involved.Kata kunci : sunbungan adhesives, perfonnansi kekakuan. performansi perpindahan panas.
Characterization of Biocomposites from Polylactic Acid and Cellulose of Oil Palm Empty Fruit Bunch Paramitha, Tika; Sitompul, Johnner P
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 5, No 3 (2020): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v5i3.39212

Abstract

Biocomposites are polymers reinforced with natural fibers, such as cellulose. This research aims to synthesize cellulose from Oil Palm Empty Fruit Bunch (OPEFB) and biocomposites from PLA and cellulose. In this study, cellulose was obtained through alkalization, hydrolysis, and bleaching of OPEFB. Biocomposites production was carried out by mixing PLA and cellulose using the extrusion method. In the extrusion method, PLA and cellulose of OPEFB were mixed using an extruder above the melting point of PLA of 170°C. The output product of an extruder was then pressed using a compression moulding machine to form biocomposites. The tensile strength of biocomposites had a smaller value than pure PLA, whereas the modulus young of biocomposites with 5% by weight of cellulose had a higher value than pure PLA. The decrease in the mechanical properties of biocomposites was caused by poor adhesion between PLA and cellulose. The water absorption of biocomposites was greater than pure PLA, which was influenced by cellulose's characteristics as hydrophilic and PLA is hydrophobic. Also, the higher water absorption in biocomposites accelerated the weight loss of biodegradability.
Co-Authors Tika Paramitha Wanadri, Agus