1. Evaluation of microwave pre-treatment
in the extraction of Spirulina Platensis
oils by supercritical carbon dioxide.
17.09.2019
ICCPE'19
Lisbon, Portugal
Hugo Fabian Lobaton
Hugo Alexander Martinez
5. State of art
• Extraction with super critical CO2 (ScCO2)
• No toxic
• Free solvent
• Temperature (31°c) and pressure (74 bars)
6. Materials and methods
Run Pre treatment Extraction conditions
1 Control Flow: 20g/min (18g CO2 + 2 g
ethanol-Polar lipids)
Extraction time: 3 hours
Temperature: 60°
Pressure: 360 bar
Spirulina weight 30 g
2 420 W, 5 min
3 420 W, 10 min
7. Kinetic model
𝑒1 = 𝑞 × 𝑦𝑠 0 ≤ 𝑞 ≤ 𝑞 𝑐 (1)
𝑒2 = 𝑥 𝑢 1 − 𝐶1 × 𝑒𝑥𝑝 −𝐶2 × 𝑞 𝑞 > 𝑞 𝑐 (2)
Sovová (Sovová, 2005)
Parameter
𝑒1 1st Phase, control by equilibrium
and external mass transfer
𝑞 Amount of solvent in certain time
𝑞 𝑐 Amount of solvent- end 1st
period
𝑦𝑠 Phase equilibrium constant
𝑒2 2 Phase, control by internal mass
transfer
𝑥 𝑢 Solute concentration
C1,C2 Model constants
8. Kinetic model
𝑟 = 1 − 𝐶1 × 𝑒𝑥𝑝
−𝐶2 × 𝑞 𝑐
2 (3)
𝑘 𝑠 𝑎 𝑠 = 1 − 𝑟 × 1 − 𝜀 × 𝑄 ×
𝐶2
𝑁 𝑚
(4)
𝐺 =
𝑒 𝑞 𝑐
𝑥 𝑢
(5)
Sovová (Sovová, 2005)
Parameter
r Pretreatment efficiency
𝒌 𝒔 𝒂 𝒔 Internal mass transfer
coefficient
𝑮 % open cells
𝑄 Volumetric flow
𝜀 Porosity
𝑁 𝑚 Solute mass fraction
𝑥 𝑢 Insoluble mass of solid
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