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ABSTRACT
A rotary disk contactor (RDC) has been used to investigate the mass recovery of essential oil (EO) in the waste water from hydro-distillation of the spearmint plant by using n-hexane. Amount of mass recovery indicates a proper performance of the RDC. Results show that an increase in rotor speed, dispersed phase flow rate, and nozzle size lead to the mass recovery enhancement. A new correlation has been developed adopting response surface methodology through a Box–Behnken design for the prediction of the mass recovery as a function of rotor speed, dispersed phase flow rate, and nozzle size.
Nomenclature
| N | = | Rotor speed (rpm) |
| dr | = | Rotor diameter (m) |
| ds | = | Inner stator diameter (m) |
| D | = | Column diameter (m) |
| H | = | Column height (m) |
| hc | = | Compartment height (m) |
| di | = | Drop size (mm) |
| Vc | = | Superficial velocity of continuous phase (m/s) |
| Vd | = | Superficial velocity of dispersed phase (m/s) |
| Q | = | Volumetric flow rate |
| ω | = | Mass fraction |
| Mw | = | Molecular weight |
Subscript
| C | = | Continuous phase |
| D | = | Dispersed phase |
| I | = | Component number |
| * | = | Final concentration or saturated value of concentration |
Greek letters
| Φ | = | Hold-up |
| Ρ | = | Density (kg/m3) |
| Σ | = | Interfacial tension between two phases (N/m) |