Abstract
This paper summarizes the results of a study of adsorption of sulfur compounds from a high-sulfur feed on improved spherical-shaped nano-AgX zeolite. For this purpose, the nano-AgX zeolite was initially synthesized and improved with silver compounds such as silver nitrate, and then it was utilized in the adsorption process. In order to investigate the equilibrium and dynamics of the adsorption process, adsorptive desulfurization of real feed (i.e., sour gas condensate from the South Pars gas field) was carried out in batch and continuous processes under several operating conditions; a temperature-dependent Langmuir isotherm model was used to fit the equilibrium data. The value of monolayer adsorption capacity (qm) and adsorption enthalpy left( {Delta H} right) were calculated to be 1.044 mmol/g and 16.8 kJ/mol, respectively. Furthermore, a detailed theoretical model was employed in order to model the breakthrough experiments. The results revealed that an increase in the feed flow rate and 1/T values will cause linear and exponential increase in the total mass transfer coefficient (k_{text{s}}). Isotherm and dynamic breakthrough models were found to be in agreement with the experimental data.
Highlights
The South Pars gas field in Iran, one of the world’s largest gas fields, produces huge amounts of gas condensate
This paper summarizes the results of a study of adsorption of sulfur compounds from a high-sulfur feed on improved spherical-shaped nano-AgX zeolite
The nano-AgX zeolite was initially synthesized and improved with silver compounds such as silver nitrate, and it was utilized in the adsorption process
Summary
The South Pars gas field in Iran, one of the world’s largest gas fields, produces huge amounts of gas condensate. Among different technologies to remove the sulfur compounds, the adsorption technology employs adsorbents such as zeolites, silica, carbonaceous material at low temperature and pressure to reduce the sulfur content; it has been an attractive solution for the customers due to the very user-friendly operational conditions. Biodesulfurization needs huge towers and oxidative desulfurization has significant losses in production of the low-sulfur product In this context, the selective adsorption desulfurization (SADS) technique is a method that is based on employing compounds which adsorb sulfur. A study of some exchanged zeolites with a high capacity for adsorption of sulfur compounds has revealed that the capacity of the adsorbents depends on their preparation conditions, and the metal ion content is an important factor influencing their effectiveness (Song et al 2014). AgX zeolite was prepared by liquid-phase impregnation of Ag? into the X zeolite, and its adsorption efficiency for sulfur components of hydrocarbon feed solutions was investigated, with the intention of modeling the corresponding sulfur adsorption isotherm and breakthrough data
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