The adsorption/desorption dynamics properties of n-alkanes in light naphtha on 5A zeolites

摘要

Self-made JH4 zeoite was characterized by BET, mercury and other methods. The dynamic dsorption capacity of nC5/nC6 in light naphtha on JH4 zeolite fixed bed was investigated. The effect of cyclic purge exhaust composition, which simulate different condensation conditions, on desorption performance of JH4 zeolite bed was studied. The results shows that, the microporous BET specific surface area and pore volume of JH4 zeolite is 710.05 m~2/g and 0.32 cm~3/g; macropore specific surface area and pore volume is 3.64 m~2/g and 0.29 cm~3/g, respectively. Under the adsorption conditions of 0.1 MPa, 165 °C, adsorption capacity of n-pentane and n-hexane in light naphtha on JH4 zeolite reaches, 7.24 g/100_(ads)s and 3.11 g/100g_(ads) respectively.If the content of pentane and hexane achieves 3.68% and 0.21% in nitrogen purge gas, total desorption amount of JH4 zeolite is 2.07 g/100g_(ads), falling 60.19% than that of pure N_2 purge.