Supercritical and subcritical carbon dioxide extraction of Indian orange peel oil

Author(s): Omprakash H.Nautiyal, Krishan Kant Tiwari

The viscosity of SC-CO2 increases rapidly in the critical region, its order of magnitude is an order less than those of liquid organic solvents even at very high pressures. Hence an attempt was made to extract the oil using SC-CO2 to study the quality, quantity and compositions of the oil. Pressures ranging from 80-150 bars with temperatures, ranging from 28-60oC were employed. SC-CO2 yielded 2.22wt%(2 h) of orange oil and hydro distillation gave 1.14wt% (9 h) of orange oil. The constituents of SC-CO2 orange oil was á-pinene 0.14, â-pinene 0.99,myrecene 2.65, limonene 88.68, terpinolene 0.55, C8 aldehyde 0.33, citronellol 0.11, and linalool 0.75 respectively.Hydro distillation yielded á-pinene 1.79, â-pinene 2.20, d-limonene 76.93,myrecene 5.18 and unidentified 14.18 respectively. Supercritical carbon dioxide extraction technology facilitates the uniform bed that allows reasonable heat and mass transfer as the surface area of the grounded orange peels either wet and/or dried increase the surface area for better penetration of the fluid under sub/supercritical conditions of set parameters. That gave the enhanced yield and extractability of the Orange peel oil constituents. Small changes in pressure or temperature have shown large changes in density and yield.

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