Titration system determines acid in biodiesel

Metrohm UK has developed Titrando, a safe and efficient way to add the necessary solvents and then automatically titrate the sample to determine the acid value of biodiesels.

Metrohm UK has developed Titrando, a titration system to determine the acid number of biodiesel.

High acid numbers have been shown to increase fueling system deposits, possibly increasing the likelihood of corrosion.

Increased recycle temperatures in fuel may accelerate degradation, which could result in high acid numbers and increased filter plugging potential.

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 bio fuel.

The smaller the value, the higher the quality.

Regulators require non-aqueous potentiometer acid-base titration for determining the acid number.

This involves dissolving the sample in a bio ethanol/diethyl ether mixture and titrating it with potassium hydroxide dissolved in 2-propanol (1 mol/L).

The Metrohm Titrando is a safe and efficient way to add the necessary solvents and then automatically titrate the sample to determine the exact acid value.

The Metrohm Solvotrode electrode, an excellently shielded combined pH glass electrode, has been specially developed for non-aqueous titrations like acid value.

The separable ground-joint diaphragm guarantees stable potentials and is easy to clean.

The iodine number is a measure for the number of double bonds in a sample.

It is the amount of iodine (in g/100 g sample) that can be added to the sample under the given conditions.

An aliquot of the bio fuel sample is dissolved in a mixture of cylcohexane/glacial acetic acid and treated with Wijs reagent.

After a defined time has elapsed, potassium iodide and water are added.

The released elemental iodine is then titrated with sodium thiosulfate solution.

Metrohm's Titrando will automate this solvent addition and titration so that accurate and safe iodine numbers are generated everytime.

Back to top