Abstract: The kinetics data for the liquid adsorption of n-paraffins on 5A molecular sieve was determined by a self-designed double-valve apparatus, and the influences of adsorption temperature, carbon number and initial concentration of n-paraffins on the liquid adsorption kinetics of n-paraffins on 5A molecular sieve were studied. Results showed that the adsorption rate of n-paraffin on 5A molecular sieve increased with the increase of adsorption temperature and initial n-paraffin concentration. The effect of n-paraffin carbon number on the adsorption rate was not significant. Furthermore, the influence of various non-normal paraffin components in naphtha, such as iso-octane, methyl cyclohexane and toluene, on the liquid adsorption kinetics of n-paraffins on 5A molecular sieve was investigated as well. Test results indicated that the influence of non-normal paraffin components on the adsorption rate of n-paraffins was as follows: aromatics＞cycloparaffins＞iso-paraffins. Results of Arrhenius formula for data fitting showed that the maximum diffusion resistance of n-paraffins in 5A molecular sieve was observed when using aromatic type solvent.

Key words: naphtha , n-paraffin , 5A molecular sieve , liquid adsorption , kinetics