The production of glycerol from biodiesel by-product that was obtained from waste cooking oil has low purity.Â This crude glycerol contains impurities such as methanol, catalyst, soap and water. Analysis result shows thatÂ crude glycerol contains 67.7% water, 16.7% ash with density 1.1217 g/mL. The impurities were able to beÂ adsorbed using bentonite which was activated in sulphuric acids 1.5 M and characterized by SEM-EDX. TheÂ purified glycerol after being treated with bentonite at 60 ï°C for 75 minutes was fulfilled The SNI 06-1564-1995Â requirement i.e. 89.5% glycerol, 4.3% water, 3.6% ash and density 1.2212 g/mL. From the experiment can beÂ concluded the activated bentonite showed a capacity in adsorbing and removing impurities in waste cooking oil.
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