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Author:
Anna Frank, Equipment Selection Expert
Anna Frank, Equipment Selection Expert
Several methods are employed for ammonia odor removal in chemical industries, including the production of nitrate fertilizers, liquid carbon dioxide, antifreeze additives, and concrete plasticizers. The choice of technology depends on factors such as ammonia concentration, gas flow parameters, and other specific design considerations for the purification system.
Ammonium fertilizer production plant
Characteristics of Ammonia Odors
Under normal conditions, NH₃ is a colorless, toxic gas with a pungent, characteristic odor. It is classified as an extremely hazardous substance. Chemically, ammonia reacts with a wide range of compounds, including acids, salts, metal oxides, water, and alcohols. Its reaction with water is particularly vigorous, resulting in the formation of a caustic alkali.
Consequently, ammonia vapors are dangerous to humans, causing severe irritation and chemical burns to the mucous membranes of the eyes, skin, and respiratory tract. This makes effective ammonia odor control critical in industrial environments. Ammonia also contributes heavily to sewage smells, where it is tackled alongside sulfide as part of wastewater odor removal.
The distinctive odor of NH₃ becomes detectable only at concentrations around 53 ppm. However, it is hazardous even at this level. The permissible occupational exposure limit (PEL) for an 8-hour work shift is set at 50 ppm. Exposure to a concentration of approximately 300 ppm can cause irreversible health damage or even death after short-term exposure.
Ammonia is roughly half as dense as air, causing it to rise and disperse rapidly. The distance of its dispersion depends on the initial vapor concentration and wind speed; for instance, with a wind speed of 3 m/s, the gas can travel up to 20 km in one hour. It behaves as a dielectric, liquefies at -33 °C, and solidifies at -78 °C.
Consequently, ammonia vapors are dangerous to humans, causing severe irritation and chemical burns to the mucous membranes of the eyes, skin, and respiratory tract. This makes effective ammonia odor control critical in industrial environments. Ammonia also contributes heavily to sewage smells, where it is tackled alongside sulfide as part of wastewater odor removal.
The distinctive odor of NH₃ becomes detectable only at concentrations around 53 ppm. However, it is hazardous even at this level. The permissible occupational exposure limit (PEL) for an 8-hour work shift is set at 50 ppm. Exposure to a concentration of approximately 300 ppm can cause irreversible health damage or even death after short-term exposure.
Ammonia is roughly half as dense as air, causing it to rise and disperse rapidly. The distance of its dispersion depends on the initial vapor concentration and wind speed; for instance, with a wind speed of 3 m/s, the gas can travel up to 20 km in one hour. It behaves as a dielectric, liquefies at -33 °C, and solidifies at -78 °C.
Ammonia Removal Process in a Wet Scrubber
Removal Methods
Ammonia can be captured from the air utilizing its ability to react with various substances through the following methods:
- Acid Reaction in a Wet Scrubber – Due to its alkaline nature, ammonia undergoes neutralization upon contact with an acid, forming a safe and highly soluble salt. Common reagents include sulfuric, hydrochloric, and phosphoric acids.
- Adsorption onto Solid Materials – NH₃ molecules are retained within the pores of porous sorbents, such as activated carbon or specialized media. Once saturated, the sorbent requires either regeneration or proper disposal.
Methods for Getting Rid of Ammonia
The application of each method is summarized in the table below.
For effective control of ammonia odor, a combined system can be implemented, where a scrubber removes the bulk of the ammonia in the first stage, followed by an adsorption filter for final purification to meet sanitary standards in the second stage.
Systems
The following systems are employed for ammonia odor neutralization:
1. A Packed Wet Scrubber, where gas flows upward through a column filled with specialized packing material. An acid solution is distributed from the top, flowing downward over the packing. This creates intense contact between the gas and liquid, facilitating the chemical reaction on the packing's surface.
Key components include: a corrosion-resistant column shell, the packed bed, a spray distribution system for uniform acid delivery, a mist eliminator, a recirculation tank, and a pump for solution circulation.
1. A Packed Wet Scrubber, where gas flows upward through a column filled with specialized packing material. An acid solution is distributed from the top, flowing downward over the packing. This creates intense contact between the gas and liquid, facilitating the chemical reaction on the packing's surface.
Key components include: a corrosion-resistant column shell, the packed bed, a spray distribution system for uniform acid delivery, a mist eliminator, a recirculation tank, and a pump for solution circulation.
2. Adsorbers, in which the gas passes through a column containing a fixed bed of granular adsorbent material, such as activated carbon or zeolite.
A typical system consists of: the adsorber column with the adsorbent bed; a flow control system (valves for switching); a regeneration unit (employing heating, steam injection, or vacuum application for desorption); and a system for cooling the bed after regeneration.
A typical system consists of: the adsorber column with the adsorbent bed; a flow control system (valves for switching); a regeneration unit (employing heating, steam injection, or vacuum application for desorption); and a system for cooling the bed after regeneration.
FAQ
How can residual ammonia concentrations below 5 ppm be achieved?
– This requires a final polishing stage using adsorption with specialized zeolites installed downstream of the main scrubber.
What is the most cost-effective method for a gas stream containing 1000 ppm of ammonia? – At such a high concentration, the most economical solution is a wet scrubber designed to recover the ammonia as a saleable salt.
How often should the adsorbent in an adsorber be replaced?
– The adsorbent's service life typically ranges from several months to several years, depending on the gas load, adsorbent type, and whether regeneration is employed.
What reagents are used to remove ammonia odor from air?
– Wet scrubber: ammonia reacts with acids. Common reagents are sulfuric, hydrochloric, and phosphoric acids. Adsorber: ammonia is captured on solid sorbents, such as activated carbon or specialized zeolites.
Which scrubber type is the cheapest to operate?
– A scrubber utilizing sulfuric acid is generally the most cost-effective to operate, due to the reagent's lower cost, typically around $200–$500 per ton.
– This requires a final polishing stage using adsorption with specialized zeolites installed downstream of the main scrubber.
What is the most cost-effective method for a gas stream containing 1000 ppm of ammonia? – At such a high concentration, the most economical solution is a wet scrubber designed to recover the ammonia as a saleable salt.
How often should the adsorbent in an adsorber be replaced?
– The adsorbent's service life typically ranges from several months to several years, depending on the gas load, adsorbent type, and whether regeneration is employed.
What reagents are used to remove ammonia odor from air?
– Wet scrubber: ammonia reacts with acids. Common reagents are sulfuric, hydrochloric, and phosphoric acids. Adsorber: ammonia is captured on solid sorbents, such as activated carbon or specialized zeolites.
Which scrubber type is the cheapest to operate?
– A scrubber utilizing sulfuric acid is generally the most cost-effective to operate, due to the reagent's lower cost, typically around $200–$500 per ton.
Ammonia Wet Scrubber by Torch-Air
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