The 3A zeolites are excellent adsorbents for industrial-scale gas dehydration because of the low energy required for regeneration and ease of operation.A computational study of the dehydration of an industrial feed st...The 3A zeolites are excellent adsorbents for industrial-scale gas dehydration because of the low energy required for regeneration and ease of operation.A computational study of the dehydration of an industrial feed stream containing ethane and water was performed using an in-house code that included an appropriate equilibrium adsorption isotherm.The validated computational model was used to examine the impact of particle size on the process dynamics and the corresponding pressure drop.The water concentration along the adsorption column was also investigated.To increase the process capacity,the packed adsorption bed was divided into two distinct layers,which were operated with different particle sizes.The length of each layer was determined by a parametric study.The best breakthrough time,i.e.,107,800 s,at the allowed pressure drop was obtained when the lengths of the first and second layers were 4.5 and 1 m,respectively.The results showed that the new two-layer adsorption bed could save around 33.8%in total energy requirement in comparison to that of a single bed.展开更多
Carbon dioxide(CO_(2))is an influential greenhouse gas that has a significant impact on global warming partly.Nowadays,many techniques are available to control and remove CO_(2) in different chemical processes.Since t...Carbon dioxide(CO_(2))is an influential greenhouse gas that has a significant impact on global warming partly.Nowadays,many techniques are available to control and remove CO_(2) in different chemical processes.Since the spray dryer has high removal efficiency rate,a laboratory-scale spray dryer is used to absorb carbon dioxide from air in aqueous solution of NaOH.In the present study,the impact of NaOH concentration,operating temperature and nozzle diameter on removal efficiency of CO_(2) is explored through experimental study.Moreover,the reaction kinetic of NaOH with CO_(2) is studied over the temperature range of 50-100℃ in a laboratory-scale spray dryer absorber.In the present contribution,a simple reaction rate equation is proposed that shows the lowest deviation from the experimental data with error less than 2%.展开更多
文摘The 3A zeolites are excellent adsorbents for industrial-scale gas dehydration because of the low energy required for regeneration and ease of operation.A computational study of the dehydration of an industrial feed stream containing ethane and water was performed using an in-house code that included an appropriate equilibrium adsorption isotherm.The validated computational model was used to examine the impact of particle size on the process dynamics and the corresponding pressure drop.The water concentration along the adsorption column was also investigated.To increase the process capacity,the packed adsorption bed was divided into two distinct layers,which were operated with different particle sizes.The length of each layer was determined by a parametric study.The best breakthrough time,i.e.,107,800 s,at the allowed pressure drop was obtained when the lengths of the first and second layers were 4.5 and 1 m,respectively.The results showed that the new two-layer adsorption bed could save around 33.8%in total energy requirement in comparison to that of a single bed.
文摘Carbon dioxide(CO_(2))is an influential greenhouse gas that has a significant impact on global warming partly.Nowadays,many techniques are available to control and remove CO_(2) in different chemical processes.Since the spray dryer has high removal efficiency rate,a laboratory-scale spray dryer is used to absorb carbon dioxide from air in aqueous solution of NaOH.In the present study,the impact of NaOH concentration,operating temperature and nozzle diameter on removal efficiency of CO_(2) is explored through experimental study.Moreover,the reaction kinetic of NaOH with CO_(2) is studied over the temperature range of 50-100℃ in a laboratory-scale spray dryer absorber.In the present contribution,a simple reaction rate equation is proposed that shows the lowest deviation from the experimental data with error less than 2%.
