Abstract:
The manufacture of biodiesel is usually used a transesterification reaction using an
alkaline catalyst. The alkaline catalyst used in this study was K-CaO catalyst derived
from shells of blood clams (Anadara granosa) using the sol-gel method with a ratio
between KOH: CKD: Ethylene glycol 0.5: 6: 12 calcined at 700, 800 and 900 oC. The
catalyst was characterized using XRD to determine the type of mineral in a material.
The types of minerals contained in the catalyst were calcite, portlandite and lime. The
catalyst was tested in biodiesel synthesis with variations in the weight of the catalyst (1,
2, 3, and 4 %). The maximum biodiesel yield was 92.48 %, that is, at the maximum
condition of K-CaO-700 catalyst with a catalyst weight of 2 %. The characteristics of
the biodiesel produced in this study were water content, density, viscosity, carbon
residue, acid number, soap number, iodium number and cetane number. The
characteristics of biodiesel was selected range of SNI 7182-2015 except for carbon
residue and cetane numbers.
