Acid value diesel fuel

Official methods of chemical analysis of conventional diesel are often not adequate to characterize biodiesel. Tests for the levels of sulfur and aromatic components in biodiesel are useful but usually reveal that the concentrations of compounds containing these atoms or functional groups are very low. Analysis of biodiesel chemistry can reveal characteristics conferred by the source of the oU, the method of manufacture, and duration of storage (20, 21). For example, free and bound glycerol is measured to ascertain if biodiesel has been completely formed during synthesis. Fatty acid content, residual soaps, iodine value, peroxide value, and fatty acid composition all may reflect the quality of biodiesel (Table 1) but are unimportant and inapplicable in conventional diesel fuel quality determination. 

The oil was produced from non-contaminated soft wood from Spain. Due to the low pH-value, acid proof materials had to be used in the fuel supply system. The pure biooil need to be preheated up to 50 °C to achieve a sufficient viscosity. Bio-oil from pyrolysis contain considerable amount of water between 20 to 30 per cent. However, combustion in the gas turbine was not hampered by the presence of water as the ignition of the bio-oil was initiated by the pilot flame burning diesel fuel. 

As a minimum, waste oil should be burned for its fuel value, a practice in some automobile servicing shops. Waste cooking oil can serve as a feedstock for diesel engine fuel. Generally, this is done by chemical treatment and esterification of the fatty acids from cooking oils and fats (see Chapter 17). Some enterprising individuals fuel their diesel-powered vehicles directly with waste oil scavenged from restaurants. 

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