H₂S Removing Plant
Using the chelated iron catalyst to remove H₂S, which is regenerable and reusable, resulting in low operating costs.
Keywords:
Category:
Biogas Purification Devices
1. Treatment Principle
(1) H2S gas is absorbed into an aqueous solution where ferric ions (Fe3+) oxidize divalent sulfur; the overall absorption-oxidation reaction equation is:
H2S(g) + 2Fe3+(L) → 2H+(L) + S↓+ 2Fe2+(L)
The solution containing ferrous ions (Fe2+) is brought into direct gas-liquid contact with air, utilizing the oxygen in the air to oxidize the ferrous ions back into ferric ions (Fe3+)， the regeneration reaction equation is:
1/2O2(g) + H2O(L) + 2Fe2+(L) → 2OH-(L) + 2Fe3+(L)
(2) Iron ions are not consumed in the reaction; they act as a catalyst for the reaction between hydrogen sulfide and oxygen.
Since the gas phase being treated contains carbon dioxide (CO2)—especially at higher pressures—the CO2 readily dissolves in water to form bicarbonates (HCO3-) and carbonates (CO32-). This leads to side reactions that lower the pH of the aqueous solution; therefore, sodium hydroxide is added to the system to stabilize the pH.
(3) The system utilizes the redox properties of an alkaline chelated-iron catalyst to absorb H2S from the acid gas. H2S is directly oxidized by the chelated iron to form elemental sulfur, while the chelated iron is reduced to the ferrous state. Air is then bubbled into the regeneration/settling tank to oxidize the ferrous ions in the alkaline absorbent back into ferric ions, allowing the absorbent to be regenerated and reused.
(4) Simultaneously, sulfur is separated via sedimentation in the regeneration/settling tank to form a sulfur slurry, which is then sent to a filter to be dewatered into a sulfur cake.
2. Technical Features
(1) The treatment process is simple; a single-step process allows for the rapid, direct oxidation of hydrogen sulfide into elemental sulfur.
(2) The chelated iron system features high sulfur capacity and robust resistance to process fluctuations, ensuring stable outlet sulfide levels.
(3) The chelated iron catalyst is regenerable and reusable with no side reactions; only minimal make-up is required, resulting in low operating costs.
(4) The chelated iron catalyst offers high selectivity, minimal byproduct salt formation, and a long service life.
(5) The sulfur capacity of the circulating desulfurization solution is unaffected by carbon dioxide; the working sulfur capacity reaches up to 8.5g sulfur/L, exceeding that of comparable international technologies.
(6) Capable of removing organic sulfur compounds such as CO2 and mercaptans.
(7) The desulfurization equipment is compact, facilitating effective skid-mounted installation and reducing setup costs.
(8) The chelated iron catalyst is safe to use and offers significant environmental benefits.
3. Treatment Process
Product Specifications
The whole H2S removing plant will be specially designed based on gas flow rate, raw gas content and treated content demands for H2S after the treatment.
Contact Us
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Phone
+86-158 6303 7696
+86-139 6390 1909
cnrunyuan@gmail.com
Address
Room 810, Building 1, Hisense Caizhi Valley, No. 88, Zhuzhou Road, Qingdao, Shandong, China
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What products do you produce?
We are specialized in drinking water treatment, industrial feeding water treatment, industrial sewage treatment, livetsock manure treatment, grain straw treatment and so on.
What information do we need before ordering?
A1: Pls advise your requirements for overall treatment process.
A2: Pls offer the water quality report for influent water or raw water type.
A3: Pls advise the max treatment capacity for design.
A4: Pls advise the quality demands for the effluent water or the usage of effluent water.
How long is your lead time?
Generally it is 25 days, depends on your needs and project scales.
Do you provide OEM service?
We provide high-quality OEM services, and also provide buyers customized products.
What other services can you provide?
Provide free technical support at any time, and also can help you design the whole treatment process of the project.
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Other products
The products are widely used for drinking water treatment, industrial water treatment, domestic sewage water treatment, industrial sewage treatment, air pollution control, organic waste treatment and so on
+86-158 6303 7696
cnrunyuan@gmail.com
Phone
+86-158 6303 7696
+86-139 6390 1909
Address
Room 810, Building 1, Hisense Caizhi Valley, No. 88, Zhuzhou Road, Qingdao, Shandong, China