Scaling Up of Liquid Soap Production from Recycled Frying Oil

Susinggih Wijana, Dodyk Purnomo, M. Y. Taslimah


The aim of this study was to know the effect of the increasing volume in saponification process on the 88 l reactor on the soap quality and efficiency of the process. The experiment consisted of 2 sub-experiments. The first sub-experiment was the factorial experiment with 2 factors, the time of stirring (60, 90 and 120 minutes) and the ratio of water to soap (2:1; 3:1, and 4:1 w/w). The second sub-experiment was scaling up with mixed material volume of 5, 15 and 25 liters.  The effectiveness index showed that the best soap quality for laboratory scale obtained at 90 minutes stirring time and ratio of water to soap of 2:1 (w/w).  Meanwhile, scaling up showed that the increasing volume tended to decrease the quality of the product, although it still met the industrial standard of liquid soap.

Keywords: scaling up, recycled frying oil, liquid soap

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