SoftAcid has been found to be significantly less corrosive towards carbon steel and other metals than formic acid. SoftAcid also reduces the evaporation of organic acids, which leads to an increased efficiency over time.
Reduction in Corrosivity
SoftAcid has been found to be significantly less corrosive towards carbon steel and other metals than formic acid (see Figure 1). This is because the aggressive nature of organic acids is reduced by the presence of lignosulphonic acid. With respect to corrosion, the dissociated lignosulphonic acid anions migrate towards the positively charged solid surfaces (such as concrete and steel) to form a protective layer.
Experiments at Sintef Materials Technology showed that the corrosion rate of SoftAcid on carbon steel was reduced by more than 95% compared to pure formic acid.
Additional trials have shown a 75% reduction in corrosion rate on concrete.
Figure 1 - Corrosion on carbon steel
Reduction in Odour/Evaporation
A significant part of organic acids (15 to 20%) that are used in feed, grains and cereals are lost via evaporation. Due to their volatile nature, organic acids also emit malodours that pose great health risks to both humans and animals.
Borregaard LignoTech has developed its own method to measure organic acid evaporation rate in feed plants, and to make a comparison with SoftAcid. If you are interested in running such a trial at your plant, please contact us.
The monitoring of acid levels present in the air during the production of feed pellets containing formic acid was carried out in a commercial feed mill (see Figure 2). From the obtained data, it can be concluded that the amount of formic acid present in the work environment was greatly reduced when formic acid was replaced by SoftAcid. A corresponding reduction in odour was also observed.
SoftAcid reduces the evaporation of organic acids, which leads to an increased efficiency over time.
Figure 2 - Evaporation of acid