The acid number in a biodiesel is used to determine the level of free fatty acids, processing acids or degradation by-products not normally found in petroleum-derived diesel
High acid numbers have been shown to increase fueling system deposits, possibly increasing the likelihood of corrosion.
Increased recycle temperatures in new fuel may accelerate degradation, which could result in high acid numbers and increased filter plugging potential.
The Titrando from Metrohm UK is described as the perfect autotitrator for trouble-free routine analysis of biodiesel.
Acid number.
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.
Regulators require non-aqueous potentiometer 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 (1mol/L).
The Metrohm Titrando of 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.
Iodine number in fatty acids and fatty acid methyl esters.
The iodine number is a measure for the number of double bonds in a sample.
It is the amount of iodine (in g/100g sample) that can be added to the sample under the given conditions.
An aliquot of the biofuel 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 thiosulphate solution.
Metrohm's Titrando will automate this solvent addition and titration so that accurate and safe iodine numbers are generated every time.
Titrando is the central building block of a flexible titration system that, aside from the titrator itself, includes dosing systems, stirrers and other accessories for communication and automation.
Titrando is powerful, intelligent and flexible - yet simple to use.
Methods are easy to program with the new Touch Control; menus are intuitive, and electronic alphanumeric keys make for quick data entry.
Dosing of the titrant and additional reagents is performed using either Metrohm Exchange Units or Dosinos.
One-touch operation.
Once the system is programmed, simply press the Start button to begin operation.
Titrando detects and alerts you to setup errors, and it can remind you to enter in vital information such as sample size and identification before the titration begins.
Data that is created with Titrando can be stored internally on a data card or on a PC; alternatively, it can be transferred directly to Lan - eliminating the need for a local PC.
