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The Tannins, with a “Pyrogallol” group whose chemical structure (particularly the – OH group’s position) is similar to that of phosphate.
Thanks to the “Pyrogallol” group, Tannins have certain advantages over phosphates.
As all-natural products, Tannins contain some impurities that block their advantages.
Since then, SERVIVAP chemists have developed a method of purifying Tannins powder. The result of this purification produced a significant increase in the Tannins’ performance. From then on, a very thin and dynamic protective film was formed on the metal (0.01 – 0.1 mm).
Some “activators” increase the Tannins’ performance on hardness stabilisation. These activators are biodegradable natural activators.
The unpurified tannin, commonly used in the boiler water treatment industry, contains these impurities preventing the formation of a homogeneous film on the boiler’s metal. Without a homogeneous film, protection against corrosion and scaling remains incomplete.
This method of production allows us to give our MK 3100 range its extraordinary performance. The products in this range have been tested and used by our clients for the past fifteen years without question.
The NEOTANNIN is all at ones a:
The main reactions are Pyrogallole and Brenzcatechine group reacting with Oxygen. The residues in terms of oxygen reduction in a boiler are Tropolones and Quinones.
The substances formed in reaction a) and b) are non-volatile, non-toxic and not dangerous to a boiler, either in the steam or the environment.
Our molecules inhibit scaling phenomena by stabilization and precipitation of limescale (Ca2+ & Mg2+).
Chemically, the residues in terms of hardness stabilization in a boiler are Complex or Chelate of lignins with Ca2+, Mg2+.
Silica is rejected and held in suspension in the water. Its concentration can be high without any risks to the process.
In the case of a turbo generator, the preparation of the boiler's feed water should be optimal and without silica.
A small quantity of silica is found in all steam produced by the boiler. The replacement of a "conventional product" with our Neotannin will cause silica to drop in the steam from 20 to 40% without changing the key parameters of the boiler's water.
Our tannic acid reacts with the metal surface by forming a Tannate of iron, creating a monomolecular dynamic film by adsorption and desorption. See more information below.
The new generation of tannin provides more powerful cleaning, and protection reactions compare to conventional treatment. The cleaning and protection reactions occur continuously and simultaneously during boiler operation. On the cleaning phase, as a solubiliser and dispersant, the tannic acid reacts with the existing deposits or sludge, and remove them from the metal. Once the surface is free, the tannic acid reacts with the metal to form iron tannate, creating a 0.01 - 0.1 mm dynamic film by adsorption and desorption. The difference with conventional treatment, the structure of the film composed only of iron tannate is homogenous (monomolecular) and remains homogenous in time, even in extreme conditions. The homogenous characteristic is the essential source of the efficiency and the saving generated of our treatment. The oxygen and hardness cannot get in contact with the metal, and instead, react with the iron tannate molecules. The sacrificed molecules are then detached from the surface and replaced by a tannic acid keeping the structure of the film homogenous.
DIAGRAM OF A CONVENTIONAL FILM MECHANISM
Boiler water treated with classic molecules, forming their conventional, multi-layer film WITHOUT cleaning the metal surface.
DIAGRAM OF A DYNAMIC FILM MECHANISM
All our Neotannin-based products (after a few days/weeks after the start of our treatment) eliminate the scale particles through solubilisation by "catching" the ions of calcium and magnesium. However, the degradation of the ferric particles (rust, FeOOH and Magnetite, Fe3O4) takes several months, especially in the case of magnetite, which is chemically very stable. The degradation mechanism of ferric particles is similar to the one of scale: the iron is "captured" by tannins, which solubilise and remove particles.
The solubilisation of deposits or particles by our tannins does not change the quantity of iron or calcium in the water. It's instead a neutralisation by our tannins capturing those elements. It does not mean that those metals disappear from the water but that they are transformed from an unfavourable/dangerous form (scale, rust, …) to a favourable/harmless form for the installation and human health (iron tannates, calcium tannates, …)
The boiler surface is coated with a film after the elimination of the deposits and rust. After 3 to 6 month, the metal surface is free from existing deposit and rust. The impurities are dissolved and trapped by the purge. The tannic acid is reacting with the metal creating the iron tannate of which the <0.1 mm homogenous protection film is composed. Compare to conventional chemical, this film is monomolecular due to adsorption and desorption phenomena.
The impurities will react with the iron tannate which will be removed and replaced by a new iron tannate. This continuous adsorption/desorption reactions define the dynamic property of our film and explain the reason why the film remains homogenous.
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