Pellet activated carbon: Green purification messenger of VOCs gas

Volatile organic compounds (VOCs) have become a significant source of air pollution. These gases may not only pose a potential threat to human health, but may also have long-term effects on the environment. As an efficient and environmentally friendly purification material, granular activated carbon is gradually receiving extensive attention.

 

In modern industry and daily life, volatile organic compounds (VOCs) have become an air pollution source that cannot be ignored. These gases may not only pose a potential threat to human health, but also have a long-term impact on the environment. In order to effectively meet this challenge, pellet activated carbon, as an efficient and environmentally friendly purification material, is gradually receiving widespread attention. VOCs involve many polluting industries. Industries that produce or use organic solvents, such as chemical and catering, will generate VOCs emissions. The VOCs emitted by various industries are of various types and complex compositions. Common ones include hydrocarbons, alcohols, ethers, esters, etc.

Types and characteristics of pellet activated carbon

Pellet activated carbon, as the name suggests, is pellet in shape, and this design gives it a larger specific surface area and stronger adsorption capacity. Depending on its raw materials and activation process, pellet activated carbon can be divided into many types, such as wood pellet activated carbon, coal pellet activated carbon, etc. Different types of pellet activated carbon differ in pore structure, adsorption performance and service life, but the common feature is that they can effectively adsorb and decompose harmful gases such as VOCs. pellet activated carbon, commonly known as pellet activated carbon, can be divided into two categories according to its raw materials: coal pellet activated carbon and wood pellet activated carbon. Wood pellet activated carbon is further subdivided into coconut shell pellet activated carbon and other wood pellet activated carbon.   Common specifications of pellet activated carbon: ф1.5mm, ф3.0mm, ф4.0mm, ф6.0mm, ф8.0mm.

1. Coal pellet activated carbon

Raw materials: high-quality anthracite is selected as raw material.

Process:

refined through a series of processes such as carbonization, cooling, activation, washing, etc.

Features: Appearance:

generally black cylindrical particles.

Performance: 

has good pore structure, strong adsorption performance, high mechanical strength, easy to regenerate repeatedly, low cost, etc.

Application areas: Water treatment:

used for purification of tap water, industrial water, sewage treatment, pure water, beverages, food, medical water, etc.

Air purification:

can remove impurities, deodorize, adsorb harmful gas substances such as formaldehyde, benzene, toluene, xylene, oil and gas.

Industrial applications:

decolorization, purification, etc.

Others: fish farming filtration, catalysts and catalyst carriers, etc

2. Wood pellet activated carbon

Raw materials: mainly high-quality wood raw materials such as sawdust and coconut shells.

Process:

Made through crushing, mixing, extrusion, molding, drying, carbonization, activation and other steps.

Features:

Compared with coal-based pellet carbon, it has lower ash content and fewer impurities. Gas phase adsorption value and CTC (carbon tetrachloride adsorption value) have absolute advantages. The product has a reasonable pore size distribution, achieving maximum adsorption and desorption, thereby greatly improving the service life of the product (average 2-3 years), which is 1-4 times that of ordinary coal-based carbon.

Application areas: Gas phase adsorption.

Recovery of organic solvents: such as the recovery of benzene-based gases toluene and xylene, the recovery of acetone in the acetate fiber industry, and the recovery of CS2 in the production of viscose staple fibers. Removal of impurities and harmful gases: waste gas recovery, recovery of excess gasoline in refineries, gas stations, and oil depots, etc.

In summary, pellet activated carbon exhibits diverse characteristics and a wide range of applications due to its different raw materials and processes. Whether it is coal-based pellet activated carbon or wood-based pellet activated carbon, it plays an important role in environmental protection, water treatment, air purification and other fields.  

Principle of purifying VOCs

The principle of pellet activated carbon purifying VOCs is mainly based on its unique pore structure and adsorption performance. The pores of activated carbon are divided into micropores, mesopores and macropores, among which micropores are the main place for adsorbing small molecular gases such as VOCs. When air containing VOCs passes through the activated carbon bed, these gas molecules will be adsorbed into the micropores of the activated carbon, thereby purifying the air. In addition, activated carbon also has a certain catalytic effect, which can decompose the adsorbed VOCs to a certain extent and extend its service life.  

Main application areas

Pellet activated carbon has a wide range of applications in purifying VOCs gas, mainly in the following aspects:

1. Industrial waste gas treatment

Pellet activated carbon plays a key role in industrial waste gas treatment. It can be used to adsorb and remove VOCs waste gas generated in the production process of chemical plants, oil and gas extraction, rubber and plastic, plastics, textiles, printing, paint, military industry, film base and other industries. These waste gases often contain benzene, xylene, acetone, ethanol, hydrogen sulfide, ether, acetic acid, styrene and other organic compounds. pellet activated carbon can effectively purify these waste gases and reduce environmental pollution with its efficient adsorption performance.  

2. Indoor air purification

As people pay more attention to indoor air quality, pellet activated carbon is increasingly used in the field of indoor air purification. It can be used in air purification equipment in indoor spaces such as offices, homes, and hospitals to adsorb volatile organic compounds such as formaldehyde and benzene and other harmful gases and odors, improve indoor air quality, and protect people's health.  

3. Solvent recovery

In the process of chemical production, the use of a large amount of organic solvents will produce a large amount of waste gas containing VOCs. The use of pellet activated carbon for adsorption recovery can not only protect the environment and ensure production safety, but also reduce production costs. pellet activated carbon with high iodine value (such as ≥1000 iodine value) is widely used in the organic solvent recovery industry due to its excellent adsorption effect.  

4. Oil and gas recovery and storage

During the process of oil and gas extraction and storage, oil and gas volatilization will produce VOCs pollution. pellet activated carbon can be used in oil and gas recovery systems to adsorb and recover volatilized oil and gas, reducing resource waste and environmental pollution.  

5. Other application areas

In addition to the above areas, pellet activated carbon can also be used in other occasions where VOCs gas needs to be purified, such as automobile exhaust treatment, tobacco industry flue gas purification, etc. With the continuous advancement and innovation of science and technology, the application areas of pellet activated carbon will continue to expand.   In summary, pellet activated carbon has a wide range of applications in purifying VOCs gas, and its efficient adsorption performance and environmental protection characteristics make it an important tool for solving VOCs pollution problems. In the future, with the improvement of environmental awareness and the development of science and technology, pellet activated carbon will play its unique role in more fields and create a cleaner and healthier living environment for mankind.