For processes using granular adsorbents, particle size is one of the important parameters that needs to be considered when selecting activated alumina. Many purchasers will directly ask: "Which one is better, 0.5–1mm, 0.5–1.5mm, or larger particles?" In fact, there is no "best particle size" that is suitable for all lube oils, all equipment, and all process conditions.
Why Is 0.5–1mm a Specification Worth Considering?
In some lube oil regeneration processes, 0.5–1mm activated alumina has good application value.
Compared with larger particles, 0.5–1mm particles have a shorter internal mass transfer distance. When lube oil passes through the adsorbent bed, the target impurities in the oil need to first contact the surface of the activated alumina and then further enter its pore structure. When the particle size is smaller, it is conducive to shortening this mass transfer path under appropriate operating conditions.
At the same time, 0.5–1mm is a granular product, not a powder, so granular bed packing and subsequent solid-liquid separation can still be carried out in suitable equipment.
This gives 0.5–1mm a certain balance advantage between adsorption contact efficiency and equipment operation.
What Are the Characteristics of 0.5–1.5mm?
In addition to 0.5–1mm, 0.5–1.5mm activated alumina is also a specification that can be considered according to process requirements.
Compared with 0.5–1mm, the particle size range of 0.5–1.5mm is wider, and the larger particles can improve the flow characteristics and ease of operation of the bed to a certain extent. In actual equipment, if customers have special requirements for bed pressure drop, oil flow rate, or particle handling, 0.5–1.5mm may be more suitable.
Is Smaller Particle Size Better for Adsorption?
Not necessarily.
This is a misconception that is very easy to occur when selecting activated alumina for lube oil regeneration.
Smaller particles may help shorten the mass transfer distance, but if the particles are too fine, they may also cause:
Increased pressure drop, increased dust, difficulty in filtration, and particle carryover.
Especially in industrial fixed-bed equipment, the adsorbent not only needs to have good adsorption performance, but also must meet the requirements for normal equipment operation.
Therefore, the following should be considered when making an actual selection:
Particle size + pore structure + specific surface area + pore volume + mechanical strength + operating conditions
What Impact Does Particle Size Have on Lube Oil Regeneration?
Mass Transfer Efficiency
When the particles are smaller, the path for the oil to enter the internal pores of the particles is relatively shorter, which is conducive to sufficient contact between the oil and the adsorbent under appropriate operating conditions.
Bed Pressure Drop
The smaller the particle size, the smaller the flow channels between the particles in the bed are generally, so attention needs to be paid to changes in pressure drop. This is particularly important for industrial equipment with high flow rates.
Filtration and Particle Separation
Activated alumina that is too fine may increase the requirements for fines and filtration, so it needs to be selected in combination with the filtration and separation methods of the equipment.
Mechanical Strength
For adsorbent beds that need to operate for a long time, activated alumina must have sufficient mechanical strength to reduce breakage and wear during loading and operation.
Zibo Xiangrun Provides Various Specifications and Customized Services
Zibo Xiangrun Environmental Engineering Co., Ltd. professionally manufactures activated alumina, which can be used for various adsorption applications, including lube oil regeneration.
According to the equipment and process requirements of different customers, Zibo Xiangrun can provide various particle size specifications, including 0.5–1mm and 0.5–1.5mm, and can customize specifications according to customer requirements.
The products can be matched according to application requirements in terms of particle size, specific surface area, pore volume, bulk density, mechanical strength, and other indicators. At present, Zibo Xiangrun's activated alumina products have been exported to the United States, Iran, the United Arab Emirates, and many other countries and regions around the world.
If you are looking for activated alumina for lube oil regeneration, please feel free to contact Zibo Xiangrun Environmental Engineering Co., Ltd.
- Professional Alumina Manufacturer.
