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A numerical modelling study of SO2 adsorption on activated carbons with new rate equations
- Source :
- Chemical Engineering Journal. 353:858-866
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Modelling dynamic adsorption of sulfur dioxide (SO2) on activated carbons (ACs) is significant in guiding practical desulphurization processes and making highly efficient use of adsorbents in terms of the adsorption rate which largely depends on particle size. In this work, models derived from the Vermeulen and an improved linear driving force (LDF) rate equation were studied for the first time on SO2 adsorption over AC particles with different sizes. For larger particles (≥3 mm), breakthrough curves predicted by the Vermeulen equation showed good agreement with experimental data, demonstrating that intraparticle diffusion resistance varied with particle size, feed concentration, adsorption time and location. For smaller particles (1 mm), a correction on the volume-averaged adsorption capacity as a function of adsorption time and saturation in the rate equation was developed to avoid the underestimation of adsorption rate due to the inappropriate parabolic concentration profile inherent in the conventional LDF model. By providing a concentration gradient and adsorption rate closer to actual values, the improved LDF equation was confirmed to provide excellent prediction results on 1-mm particles. Different modelling characteristics of the two models indicates varying effects of intraparticle diffusion on adsorption rate with particle size regarding the specificity of SO2 physisorption on ACs.
- Subjects :
- Materials science
General Chemical Engineering
Kinetics
Thermodynamics
02 engineering and technology
General Chemistry
Rate equation
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Industrial and Manufacturing Engineering
0104 chemical sciences
chemistry.chemical_compound
Adsorption
chemistry
Physisorption
Desorption
Environmental Chemistry
Particle size
0210 nano-technology
Saturation (chemistry)
Sulfur dioxide
Subjects
Details
- ISSN :
- 13858947
- Volume :
- 353
- Database :
- OpenAIRE
- Journal :
- Chemical Engineering Journal
- Accession number :
- edsair.doi...........a2ca55b0e305106265da744b3817efe4