PEMANFAATAN MINYAK GORENG BEKAS DAN ABU KULIT BUAH KAPUK RANDU (SODA QIE) SEBAGAI BAHAN PEMBUATAN SABUN MANDI ORGANIK BERBASIS TEKNOLOGI RAMAH LINGKUNGAN

Abstract

Capok Randu (Ceiba petandra (L)) Gaerin van Indica (D.C) are most ever seen in Indonesia mainly as horticulture in Central Java, with the total areas of 95.107,17 ha. Manufacture of capok randu’s ash leather called Soda Qie and it contains 78%W of potassium. In the other hand, consumption of frying oil in Indonesia is very high and it increases annually, up to 500.000 tons/year. Ex frying oil produced still contains plenty of free fatty acid and it can be used as raw material in preparation of soap with soda qie as a source of alkaly by saponification reaction. This experiment aimed to find the optimum operation condition in soap preparation and the its reaction kinetic. This experiment is designed using RSM method (Response Surface Methodology) and software Statistica 6. Parameters in this research are ex frying oil volume of 100 ml, soda qie solution concentration of 300 g / 1000 ml, and saponification reaction time of 60 minutes. Independent variables are the reaction temperature of 30, 60, 90 oC, ratio of soda qie volume : ex frying oil volume 3:1 ; 4:1 ; 5:1 ml. Optimation is conducted at saponification reaction time variables of 30, 60, 90, 120 minutes. Observed responses are amount of Free Fatty Acid (FFA), and free alkali of the product. The optimum operation condition are gained at temperatur of 90oC, reactant ratio of 3:1. In the soap product, the number of FFA are 0,80%, and the number of free alkali are 0,08%, this is fulfill the SII.0005-72. The rate constant gained were 0,068 menit-1.