Journal
ENERGY & FUELS
Volume 23, Issue 5-6, Pages 3307-3312Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ef900143u
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Funding
- National Basic Research Program of China [2007CB210205]
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Effective separation methods must be developed to generate fractions of similar polarity and to concentrate the undistillable compounds before bio-oils are to be a source of chemicals production. Phase separation is one effective pathway to realize initial separation of bio-oil. By adding a little salt (3 wt % of bio-oil) or aqueous salt solution (10 wt % of bio-oil) including LiCl, CaCl2, FeCl3, (NH4)SO4, K2CO3, and Fe(NO3)(3), the pyrolysis bio-oil of rice husk would quickly form two phases (40-80 wt % of the upper phase, 20-60 wt % of the bottom phase). On the basis of elemental analysis, C-13 NMR integrations and GC/MS analysis, it has been demonstrated that some major components in the bio-oil are concentrated in upper/bottom phases respectively. The upper layers exhibit high contents of water, acetic acid, and water-soluble compounds; low density, viscosity, and calorific values; and high distillable substances (up to 65%). The bottom layer consists of low water content, high lignin-pyrolysis compounds, and low distillable substances (< 10%), with high viscosity and calorific values. The physiochemical properties of two phases from the phase separation depend on the nature and dosage of salt added.
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