How does a H2S scavenger work?

H2S scavengers are widely used in hydrocarbon processing facilities to maintain plant worker’s safety and productivity and eliminate their odor emissions. These specialized chemicals react selectively with and remove H2S to help meet product and process specifications.

What is the chemical reaction for H2S?

In general, hydrogen sulfide acts as a reducing agent, especially in the presence of base, which forms SH−. At high temperatures or in the presence of catalysts, sulfur dioxide reacts with hydrogen sulfide to form elemental sulfur and water.

What happens when H2S is oxidized?

The mechanism of the interaction of H2S with either reagent is ionic and involves heterolytic dissociation of H2S and exchange of S2- and SH- anions for O2- or OH-. Subsequently water is eliminated and, in coupled redox reactions, sulfide is oxidized to elemental sulfur and Fe3+ cations are reduced to Fe2+.

What does H2S decompose into?

hydrogen gas
We are developing a process that would decompose hydrogen sulfide into hydrogen gas and elemental sulfur.

How do you get rid of H2S?

Hydrogen sulfide may be reduced or removed by shock chlorination, water heater modification, activated carbon filtration, oxidizing filtration or oxidizing chemical injection. Often treatment for hydrogen sulfide is the same as for iron and manganese, allowing the removal of all three contaminants in one process.

Can H2S be both oxidized and reduced?

The oxidation state of sulfur in H2S and in HS– is –2. Thus, H2S can only be oxidized; it cannot act as an oxidant.

Does H2S react with water?

H2S combines with water to form sulfuric acid (H2SO4), a strongly corrosive acid. Corrosion due to H2SO4 is often referred to as sour corrosion. Because hydrogen sulfide combines easily with water, damage to stock tanks below water levels can be severe. Water with hydrogen sulfide alone does not cause disease.

What are the symptoms of H2S exposure?

Symptoms of acute exposure include nausea, headaches, delirium, disturbed equilibrium, tremors, skin and eye irritation, and convulsions. Inhaling high concentrations can produce extremely rapid unconsciousness and death. Dermal exposure to the liquefied gas can cause frostbite injury.

What is the reaction between H2S and triazine?

One mole of triazine reacts with two moles of H2S to form dithiazine, the main byproduct. An intermediate product is formed, but rarely seen. The reaction is shown in Figure 3. The R-groups that are released during the two-step reaction vary by the supplier, and can be tailored for solubility.

How is H 2 s scavenged by triazines?

The mechanism for H 2 S scavenging by triazines depends on the substitution at the electrophilic carbon. Carbon atoms connected to a sulfur atom are less electrophilic than those connected to nitrogen. The capture of the first equivalent of H 2 S by 1,3,5-hexahydrotriazines occurs via a S N 1 mechanism.

How is monoethanolamine converted to MEA triazine?

monoethanolamine released during the reaction. During the reaction, MEA-triazine is converted into the two-sulfur-containing dithiazine, il- lustrated in Figure 2.

What is the mechanism for H2S scavenging?

The corrosion phenomena associated to the presence of H 2 S – Sulfide Stress Corrosion Cracking (SSCC), Hydrogen Embrittlement (HE), Stress Oriented Hydrogen Induced Cracking (SOHIC) and Hydrogen Induced Cracking (HIC), to cite some – might cause sudden fracture in production lines [ [5], [6], [7], [8] ].