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This study aims to optimize peppermint oil extraction process using response surface methodology (RSM). Experiments were performed for different batch sizes (1500, 1700, and 1900 kg). System performance was evaluated in terms of thermal efficiency, productivity, essential oil yield (EOY), extraction efficiency, and CO 2  emissions. Total energy consumption for 1500, 1700, and 1900 kg batch sizes are 1379.46, 1336.58, and 1286.56 kWh, while CO 2  emissions are 1104, 1069, and 1028 kg, respectively. Maximum hourly system productivity, cumulative productivity, maximum hourly thermal efficiency, maximum extraction efficiency, and maximum EOY were obtained as 8.3 L/h, 20 L, 2%, 41.5%, and 0.461% (w/w), respectively, for 1900 kg. Average increase in total productivity, extraction efficiency, and EOY was 49.25%, 1%, and 26%, increasing in batch size from 1500 kg to 1900 kg. Extraction time and batch size have important effect (p &lt; 0.001) on the extraction yield. Optimal process parameters are identified 300 min of extraction time and 1807.5 kg of batch size. The highest oil yield was 1.0614% under optimal conditions. Experiment was further performed for 1807.5 kg of batch size and the yield was found as 1.04621. Predicted and experimental results were found in good consistency with percentage deviation of 1.436. Therefore, this is helpful in conducting further research on optimizing process parameters for conventional distillation system of peppermint oil extraction.

Process optimization of conventional steam distillation system for peppermint oil extraction