Catalyst screening
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What does catalyst screening analysis mean? An experienced worker said that screening is related to density; then why is it necessary to analyze the catalyst through screening before using it? I wonder if Haiyou will understand what I mean/
The particle diameters of the catalyst are not uniform, and the percentage of particles of each size is referred to as the catalyst’s sieve analysis composition. To ensure a good fluidization state, the sieve analysis of the catalyst must meet the following requirements: easy fluidization, a large heat transfer area, and low loss of catalyst due to air flow entrainment. This is also the purpose of analyzing the sieve composition. This post was last edited by chengkang on 2009-3-22 13:05]
That is, the ratio of the catalyst density to its volume, right?
The sieve analysis composition is expressed as percentages. For example, what percentage is accounted for by 0–40 microns, what percentage by 40–80 microns, and what percentage by those larger than 80 microns? That’s what it means.
The percentage of the total weight accounted for by particles of different sizes is shown separately. Problems in the reverse regeneration system can be inferred through sieve analysis. For example, the quality of fluidization ； The operation of the cyclone ； Check whether there is steam leakage into the regenerator, etc. It is an important tool for analysis when there are problems with the anti-reaction system.
The catalyst must ensure good fluidization and minimal gas entrainment loss.
Screening, in simple terms, refers to the use of a sieve with specific pore sizes. The catalyst is placed on this sieve and shaken; those catalyst particles with smaller pore sizes pass through the holes and fall through, while those with larger pore sizes cannot pass through the holes and remain on top of the sieve. In this way, catalysts of different sizes are separated from each other. This process of separating catalysts of varying sizes using a sieve is simply called screening. Since catalysts generally have different volumes and radii and are not uniform in size, it is necessary to screen them to a certain size before using them. I used such sieves in experiments at school; they are named according to the number of holes per inch, such as 40-mesh, 60-mesh, etc
I want to know what methods are used to analyze the particle size distribution of catalysts
In the past, the determination of screening was done manually using sieves; nowadays, it is generally analyzed with instruments—laser particle size analyzers.
The process of separating mixtures with different particle sizes into various size categories using a sieve with holes is called screening. Factors affecting screening: ① An appropriate particle size range – the closer the particle size of the material is to the critical diameter, the more difficult it is to separate them ； ②As the moisture content in the material increases, its viscosity rises, making it prone to clumping or blocking the sieve pores ； ③The particles are small in size and low in density, making it difficult to sieve the material ； ④Parameters of the screening device.
I’ve learned about it; do any specialized manufacturers in catalyst screening have their contact information?
Screening is primarily used to observe the particle distribution of the catalyst, and the internal operating conditions are determined based on this particle distribution