Contact us
1. Acidity
The acids are present in oil in the form of:
Organic acids
Inorganic acid
Due to additives in new oil
2. Alkalinity:
The alcaline is added and in the new oil to neutralize the products produced by the oxidation of the oil when used.
3. Acid and alkali index:
Acid index (AN, TAN):
HA + KOH => KA + H2O
The number of mg KOH needed to neutralize acid contained in 1 gram of oil.
Alkalinity index (BN, TBN)
MOH + HC1 => MC1 + H2O
The mg KOH ratio is equivalent to the amount of HC1 (or HC1O4) acid needed to neutralize the bases contained in 1 gram of oil.
Unit AN, BN: mg KOH / g of oil
4. Purpose of determination:
Know the properties of new oil.
Monitor oil degradation during use.
0% <S <1% => TBN <10
1% <S <2% => TBN = 25 -30
2% <S <3.5% => TBN = 30 – 40
3.5% <S <5% => TBN = 40 – 80