As the demand for biodiesel grew, so did the amount of glycerol produced as a by-product. Purifying crude glycerol and converting it into a more valuable product takes time and effort. Crude glycerol as a by-product could not be isolated from the rise in biodiesel production. One of these is by the acetylation process, which converts glycerol into triacetin, which can be utilised as a bio additive in gasoline. The goal of this research is to see how the concentration and kind of acid used in glycerol purification affect the results. Acidification, adsorption, filtration, distillation, and evaporation were used to purify the water. H3PO4, H2SO4, and HCl were used in the acidification processes in percentages of 0.5 percent, 1 percent, 2.5 percent, 5 percent, 7.5 percent, and 10%. The purified glycerol was analysed for glycerol content, water content, density, and viscosity before being converted using Ni/Zeolite as a catalyst in an acetylation reaction. The reaction products were analysed using a NaOH titration to determine the amount of unreacted acetic acid that was converted to reaction conversion. It can be concluded that the addition of 5% H3PO4 resulted in the highest glycerol concentration, with a glycerol content of 79.59 percent and a glycerol conversion in the acetylation reaction of 82.39 percent. It can also boost the Octane Number of commercial gasoline by 6.5 percent when used as a bio additive.

Author (S) Details

H. Dewajani
Chemical Engineering Program, Politeknik Negeri Malang, Jalan Sukarno Hatta 9, Malang, 65141, Indonesia.

T. Susanti
Chemical Engineering Program, Politeknik Negeri Malang, Jalan Sukarno Hatta 9, Malang, 65141, Indonesia.

D. Pratiwi
Chemical Engineering Program, Politeknik Negeri Malang, Jalan Sukarno Hatta 9, Malang, 65141, Indonesia.

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