Table 3.
Comparison of environmental impact and economic effect with different methods, each experiment was repeated for three times.
| SOSFMRDa |
SOSFMD |
SFME |
MHD |
HD |
||
|---|---|---|---|---|---|---|
| Power-consuming apparatus | Microwave oven | Rotating motor | Microwave oven | Microwave oven | Microwave oven | Heating jacket |
| Electric power (W) | 650 | 25 | 650 | 700 | 700 | 500 |
| Energy consumption time (min) | 38 | 38 | 38 | 38 | 180 | |
| Electricity consumption (kW h) | 0.43 | 0.41 | 0.44 | 0.44 | 1.5 | |
| Yield of essential oil (mean ± SD, mL/kgDW) | 21.68 ± 1.02 | 20.23 ± 0.85 | 18.34 ± 0.79 | 17.55 ± 0.81 | 15.64 ± 0.61 | |
| Yield of essential oil per kilowatt hour (mean ± SD, mL/kgDW/kWh) | 50.42 ± 2.37 | 49.34 ± 2.07 | 41.68 ± 1.80 | 39.89 ± 1.84 | 10.43 ± 0.41 | |
| Environmental impact (g CO2 rejected) | 342.00 | 329.33 | 354.67 | 354.67 | 1200 | |
a
SOSFMRD: salting-out solvent-free microwave rotary distillation; SOSFMD: salting-out solvent-free microwave distillation; SFMD: solvent-free microwave distillation; MHD: microwave hydrodistillation; HD: hydrodistillation.