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Сorrosion inhibitors (Н₂S)

 The corrosion inhibitor «Unicor-3S»

The corrosion inhibitor «Unicor-3S» is designed for gas and gas condensate fields conditions with a high content of hydrogen sulphide (H2S). Physical and chemical as well as technological properties of the given inhibitor provide protection against general corrosion and specific types of corrosion

(hydrogen charging, development of brittleness) without process flow disruption of natural gas output and preparation of gas to transport and gas conversion process.

«Unicor-3S» is a polyaminoamides, imidazolines and solvents composition. In the stream of highly mineralized water a level of protection against corrosion damage exceeds 90% and provides aftereffect more than 90 days.
In such case high-performance protection of tube steel is achieved as late as using a 5% solution of the inhibitor in the gas condensate (Z = 95,7%).

Outer appearance - liquid from light yellow to dark brown colour.
Density at 20° C in the range of 20°С в пределах 820-900 g/cm 3.
Solidification temperature is not higher - minus 35° C.
Amine number, g HCl with a mass fraction of 100% for 100 inhibitor, at least - 1.5.
Foaming properties - low.
Protective action.
The inhibitor «Unicor-3S» efficacy in the presence of hydrogen sulfide H2S and carbon
dioxide CO2 is shown in table 3.

Table 3

Aggressive substance

Inhibitor concentration,

% vol.

Inhibitor protective action,

% vol.

NaCl 23 g / l in the presence of hydrogen sulfide H2S (2,5%) and CO2



The «Unicor-3S» investigation of the effect on the foamability of absorbents is performed by using the aqueous solution of diethanolamine model (DEA and 20% vol.) and methyldiethanolamine (MDEA, about 10%). These studies are summarized in table 4.

Table 4

Inhibitor solution ωing = 5%

Foam height h,mm


According to the degree of impact on the human body it relates to the 3rd class, subclass 3.3, categories 3.3.1. It is supplied in drums and railway tanks.