Coconut husk to reducing sugar conversion using combined ultrasound and surfactant aided subcritical water

Zuhroh, Saiyyidah Tus and Fatmawati, Akbarningrum and Widjaja, Arief (2022) Coconut husk to reducing sugar conversion using combined ultrasound and surfactant aided subcritical water. Jurnal Rekayasa Proses, 16 (2). pp. 15-22. ISSN 2549-1490

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Abstract

OBJECTIVESThe first purpose of this study was to investigate the effect of operating variables and surfactant concen- tration in subcritical water after ultrasonic process on the sugar-producing yield from coconut husk. The second purpose was to obtain the optimum operating condition of the subcritical water process. METHODS The sonication before subcritical water process was done by dispersing 40 mesh coconut husk powder in water at 60°C, and 35 kHz. The effect of sonication time was studied by comparing the material crystallinity and composition after being treated for 30 minutes. In this research, the optimization was done by using a Box-Behnken response surface methodology (RSM) experimental design with 3 factors (temperature, time, and surfactant concentration). The designed lower and upper levels were 130°C and 170°C, 40, and 80 minutes, as well as 1 and 3% (w). RESULTS The results showed that the quadratic response surface model predicted the maximum reducing sugar yield to be 12.0%, which was achieved at the optimum condition of 170°C, 77.5 minutes, and 2.3% SDS surfactant addition. CONCLUSIONS The experiment run at the obtained optimum condition resulted in a reducing sugar yield of 11.7%, which was close to that obtained from the model prediction.

Item Type:	Article
Uncontrolled Keywords:	sonication; subcritical water; surfactant; ligno- cellulose; box behnken
Subjects:	Q Science > QD Chemistry T Technology > TP Chemical technology
Divisions:	Faculty of Engineering > Department of Chemical Engineering
Depositing User:	Akbarningrum F, 61115
Date Deposited:	08 Apr 2023 21:37
Last Modified:	08 Apr 2023 21:37
URI:	http://repository.ubaya.ac.id/id/eprint/43853

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