Optimization of Aluminium Oxide/Acid‐Treated Palygorskite by Response Surface Methodology and its Application in Adsorptive Separation of the Methanol‐Dimethyl Carbonate Azeotrope

• DOI: 10.1002/slct.202204423
• Publication Date: 2023-04-18T04:41:50Z
• Authors: Xueni Sun; Lu Tian; Siyuan Chen; Hao Tan; Hui Shao
• Keywords: Dimethyl carbonate; Palygorskite; Central composite design; Azeotrope

Abstract A low‐cost composite adsorbent aluminium oxide/acid‐treated palygorskite (Al 2 O 3 /HPal) was prepared by the total incipient wetness method and succesfully applied for separation of methanol‐dimethyl carbonate (MeOH‐DMC) azeotrope first time. Major synthetic factors influencing final performance were explored response surface methodology (RSM) based on Box‐Behnken design (BBD). Adsorbents under optimized synthesis conditions characterized XRD, FT‐IR, SEM, TEM BET analysis. Adsorptive Al /HPal investigated both static dynamic experiments. The adsorption capacities MeOH DMC 335.52 mg g −1 23.92 , respectively, while selectivity S factor α towards equaled to 14.03 6.1. Kinetic curves fitted pseudo‐second‐order model. Isotherm study results indicated two different behaviors this where heterogeneous multi‐layer observed but monolayer occurred with inhomogeneity. Moreover, thermodynamic suggested that driving force MeOH‐DMC system included enthalpy entropy effects.