Effect of neutralization on the properties of methyl ester dielectric liquid

Latif, Siti Nabilah (2021) Effect of neutralization on the properties of methyl ester dielectric liquid. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Previously, waste cooking oil methyl ester have been produced via transesterification process [I. S. Chairul, N. Abu Bakar, M. N. Othman, S. A. Ghani, and M. N. Deraman, “Development Of waste cooking oil methyl ester as potential electrical insulating fluid for power transformer,” ARPN J. Eng. Appl. Sci., vol. 13, no. 20, 2018]. However, its acidity is more than the standard requirement of 0.06 mgKOH/g. Thus, this study aim to firstly lower the oil acidity so that it can achieve the standard. Therefore, this research proposes to neutralize waste cooking oil with caustic soda (normality: 3.0 N) for develop methyl ester using sodium hydroxide (NaOH) with percentage of NaOH are 0.2%, 0.4%, 0.6%, 0.8%, 1.0% and 1.2%. It will reduce usage of mineral transformer oil as insulants for industrials, power transmission and distribution transformers insulation system. The waste cooking oil was neutralized using caustic soda with normality 3.0 N at a temperature of 70° and stirring speed at 400 rpm for 5 minutes before do the transesterification process. The suitable weight for NaOH is 0.6% or 3 g in the 500 ml of neutralized WCO and 125 ml of methanol because lowest acidity was achieved for neutralized WCOME. The acidity of neutralized WCOME is 0.2320 mgKOH/g and WCOME from the previous research is 0.25652 mgKOH/g. The WCOME with neutralization and without neutralization effect in acidity measure. The results show that neutralization process give effect in the acidity of the oil. But as for the requirement new natural ester fluid, the acidity of neutralized WCOME not achieve the standard which is 0.06 mgKOH/g. Furthermore, the breakdown voltage of oil was achieve the standard requirement which is more than 20 kV. The neutralization process also change the colour of the oil from dark brown to clear yellowish. As for the transesterification process, the weight of NaOH give influence the yield of oil.

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