DIFFUSION-CONTROLLED ADSORPTIVE UPTAKE OF COAL AND PETROLEUM ASPHALTENES IN A NiMo/Al2O3 HYDROTREATING CATALYST
| Autor: | James A. Guin, Xiaofeng Yang |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
business.industry
Chemistry General Chemical Engineering Diffusion Size-exclusion chromatography technology industry and agriculture Fraction (chemistry) General Chemistry complex mixtures Adsorption Chemical engineering Organic chemistry Coal business Hydrodesulfurization Asphaltene Refining (metallurgy) |
| Zdroj: | Chemical Engineering Communications. 166:57-79 |
| ISSN: | 1563-5201 0098-6445 |
| DOI: | 10.1080/00986449808912381 |
| Popis: | In this work, hindered diffusion of one coal and two petroleum asphaltenes was studied by adsorptive uptake in THF from a bath surrounding a NiMo/Al2O3 catalyst. A mathematical model for the adsorption-diffusion of asphaltenes was developed. The model parameters were obtained by simulating the experimental data with the model solution. Several asphaltene fractions were defined via SEC (Size Exclusion Chromatography), with the molecular weight of each fraction being determined by its elution characteristics. It was found that both the coal and petroleum asphaltenes have very broad molecular weight distributions; however, the molecular weights of the coal asphaltenes (50-2000) were much smaller than those of the petroleum asphaltenes (200-30000). The uptake rates for asphaltene fractions with different molecular weights varied, depending on their diffusion rates and adsorption constants. Simulation results showed that even though the properties of coal and petroleum asphaltenes were quite different... |
| Databáze: | OpenAIRE |
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