Oleoresin Solvents and Their Properties – Acetone Hexane Ethylene Dichloride

Oleoresin Solvents and Their Properties

The following solvents were chosen for extraction

  • Acetone
  • Hexane
  • Ethylene Dichloride

Salient properties of the solvents are given below

Properties of Acetone

Molecular formula
C6H14
Density
0.6548 g/mL, liquid
Molar mass
86.18 g/mol
Appearance
Colorless liquid
Melting point
95 ºC (178 K)
Boiling point
69 ºC (342 K)
Solubility in water
13 mg/L at 20ºC
Viscosity
0.294 cP at 25 ºC
Molecular weight
58.08
Boiling point
56.29ºC
Vapor pressure
184.5 Torr at 20ºC
Freezing point
-94.7ºC
Refractive index
1.3587 at 20?C
Density
0.7900 g/mL (6.592 lb/gal) at 20ºC 0.7844 g/mL (6.546 lb/gal) at 25ºC
Dielectric constant
20.7 at 25ºC
Dipole moment
2.69 D at 20ºC
Solvent group
6
Polarity index (P’)
5.1
Eluotropic value on alumina
0.56
Viscosity
0.36 cP at 20ºC
Surface tension
23.32 dyn/cm at 20ºC
Solubility in water
Miscible in all proportions
Flash point
-4ºF (-20ºC) by closed cup
Lower explosive limit
2.50%
Upper explosive limit
12.8%

Properties of Hexane

Molecular weight
86.18
Boiling point 68.7ºC
Vapor pressure 124 Torr at 20ºC
Freezing point -95.3ºC
Refractive index 1.3749 at 20ºC
Density 0.6594 g/mL (5.503 lb/gal) at 20ºC 0.6548 g/mL (5.464 lb/gal) at 20ºC
Dielectric constant 1.88 at 25 ºC
Dipole moment 0.08 D at 25ºC
Solvent group 0
Polarity index (P’) 0.1
Eluotropic value on alumina 0.01
Viscosity 0.31 cP at 20ºC
Surface tension 17.91 dyn/cm at 25ºC
Solubility in water 0.014% at 20º
Flash point -7ºF (-22ºC) by closed cup
Lower explosive limit 1.1%
Upper explosive limit 7.5%

The low boiling point of hexane (67ºC / 152ºF) and the high solubility of oils and fats in it are the properties exploited in the solvent extraction process

Properties of Ethylene Dichloride

Molecular weight
98.96
Boiling point
83.48ºC
Vapor pressure
83.35 Torr at 20ºC
Freezing point
-35.66ºC
Refractive index
1.4448 at 20ºC
Density
1.253 g/mL (10.46 lb/gal) at 20ºC
1.246 g/mL (10.40 lb/gal) at 25ºC
Dielectric constant
10.36 at 25C
Dipole moment
1.83 D at 25ºC
Solvent group
5
Polarity index (P’)
3.5
Eluotropic value on alumina
0.49
Viscosity
0.79 cP at 20ºC