Determination of the acid number of biofuels by Titration
Non-aqueous potentiometric acid-base titration
The acid number is a sum parameter for all acidic components;
at the same time it is a measure for the long-term stability
and corrosiveness of the biofuel. The smaller the value, the
higher the quality. Standard EN 14 104 stipulates
a non-aqueous potentiometric acid-base titration for determining
the acid number. This involves dissolving the sample in a
bioethanol/diethyl ether mixture and titrating it with potassium
hydroxide dissolved in 2-propanol (1 mol/L). As organic solvents
are used, the manual working steps should be reduced to a
minimum.
Non-aqueous Titrations by Metrohm
With its space-saving Dosino technology
the titrator Titrando allows fully automatic
and safe solvent addition. The Solvotrode,
an excellently shielded combined pH glass electrode, has been
specially developed for non-aqueous titrations. The separable
ground-joint diaphragm guarantees stable potentials and is
easy to clean.
Product information
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Biofuel
Analysis 
