Energy Consumption for Patchouli Oil Extraction Using Ohmic Heating

Abstract

Currently, the process of releasing patchouli oil is carried out by extraction, water-steam distillation, and hydrodistillation. A new method for extracting patchouli by hydro distillation using electric voltage by ohmic heating has not been widely used. This paper aims to determine the energy requirements for extraction using ohmic heating. The method used is to make an extraction tool using electricity and extract the dried patchouli leaves. The electricity used for extraction is AC electricity with voltages of 90 V, 100 V, and 110 V. The ratio of patchouli to water is 1:12. Observations were made on changes in voltage and electric current during the extraction process, the length of the extraction process, and the yield of patchouli oil. As a comparison, water distillation extraction method was used using an electric stove heater. The experimental results show that the energy consumption during the extraction process starting from the lowest is 3584.7 kJ (voltage 90 V), 3488.96 kJ (voltage 100 V), 3313.77 kJ (voltage 110 V) and 4386.69 kJ (voltage 220 V). The highest oil yields were 5.10 g (voltage 100 V); 3.15 g (voltage 90 V); 2.00 g (voltage 110 V); and 1.00 g (voltage 220 V). Patchouli oil extraction using ohmic heating provides higher yields and lower energy than electric stove heating.