首页|Dynamic simulation of adsorption desulfurization from diesel fuel over activated carbon in the fixed bed
Dynamic simulation of adsorption desulfurization from diesel fuel over activated carbon in the fixed bed
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NSTL
A fixed bed for adsorption desulfurization(ADS)from a typical diesel fuel is designed via dynamic simulation,taking into account the hindering effects of polyaromatics(PAHs)and nitrogen compounds.Experimental results reveal the order of these compounds in term of adsorption affinity as dibenzothiophene > indole > quinoline > methylnaphthalene > naphthalene.At equimolar concentrations,the inhibitory effect of nitrogen compounds is substantially larger than that of PAHs.The simulations of mul-ticomponent breakthrough curve based on the ideal adsorbed solution theory and the linear driving force model match the experimental data.The mass transfer process is controlled using a combination of liquid film diffusion and pore diffusion.For adsorbate molecules with a critical diameter of approximately 0.7 nm,the mass transfer process possibly occurs from the liquid phase into macro-or mesopores before being adsorbed in micropores.The designed fixed bed for ADS from a typical diesel fuel shows a good negative linear relationship between the liquid hourly space velocity and the ratio of dibenzothiophene to the total adsorption amount(maximum value of 9.82%).
NSTL
