Separation of cresol isomers by means of organic-modified clays

Nikitina, N. I.; Nikulichev, Yu. G.; Mysak, A. E.; Davidyan, R. G.

doi:10.1007/bf00726263

Cited by 1 publication

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“…Adsorption is a promising method because it requires low energy, is inexpensive, and has simple operation. A variety of porous materials, including hydrotalcite, clays, ion‐exchange resins, and activated carbon, have been used for adsorptive separation of m‐cresol 3 /p‐cresol 2 . Vijayakumar et al .…”

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confidence: 99%

“…Adsorption is a promising method because it requires low energy, is inexpensive, and has simple operation. A variety of porous materials, including hydrotalcite, [13] clays, [14] ion-exchange resins, [15] and activated carbon, [16] have been used for adsorptive separation of m-cresol 3/p-cresol 2. Vijayakumar et al [13] studied liquid phase static adsorption of m-and pcresol 2 on ZnÀ Al hydroxide with different Zn/Al molar ratios in different solvents.…”

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confidence: 99%

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Selective Adsorption of p‐Cresol from a Mixture of m‐Cresol and p‐Cresol over ZSM‐5 with Controlled Micro‐ and Mesoporosity

Guo

et al. 2019

ChemistrySelect

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Ammonium hexafluorosilicate (AHFS) 1 at different concentrations was utilized as a mesopore‐generating agent to synthesize hierarchical ZSM‐5 (Si‐ZSM‐5) adsorbents; K+‐exchanged hierarchical ZSM‐5 (K−Si‐ZSM‐5) was successfully prepared by an impregnation method. The properties of adsorbents were characterized using XRD, XRF, N2 adsorption‐desorption and NH3‐TPD. The selectivity separation of p‐cresol 2 and m‐cresol 3 on adsorbents were experimentally investigated using a liquid breakthrough method. The enhanced adsorption capacity of Si‐ZSM‐5 is attributed to the creation of mesopores, which probably led to higher adsorption diffusion. The introduction of K+ into hierarchical ZSM‐5 diminishes the acid sites, strengthens adsorption sites, and reduces the mesopore diameter. Thus, K−Si‐ZSM‐5 possessed higher separation efficiency compared with the parent HZSM‐5. The concentration of AHFS had significant impact on adsorption capacity and the separation efficiency of adsorbents, and AHFS at a concentration of 0.5 M exhibited the optimal adsorption performance. Furthermore, the adsorbent is easy to prepare under laboratory conditions, and through a large scaled‐up breakthrough experiment, it is suitable for practical industrial applications. Also, we propose separation mechanisms of m‐cresol 3 and p‐cresol 2, and these are mainly controlled by shape selection and adsorbent‐adsorbent interactions.

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