Influence of monovalent cations ion-exchange on zeolite ZSM-5 in separation of para-xylene from xylene mixture

A Polymorphic Azobenzene Cage for Energy‐Efficient and Highly Selective p‐Xylene Separation

“…[8,9] Para-Xylene (pX), is the most valued among the C8 isomers for producing polymers such as polyethylene terephthalate (PET) and polyester. [10] Conventionally, C8 isomers are separated by different energy-demanding methods including fractional crystallization [11] and selective adsorption using inorganic and hybrid sorbents such as zeolite H-ZSM, [12] metal organic frameworks, [13][14][15] and metallocycles. [16] More recently, a non-porous molecular complex, [17] switching layered materials [18] and organic non-porous adaptive crystals (NACs) have shown excellent selectivity in the separation of xylenes [19] where the preferred guest molecules, entering these initially non-porous crystals, are accommodated by structural transformations.…”

“…At the aliphatic region, a relatively two broad singlet peaks appeared at 3.86 and 2.87 ppm that are assigned to the methylene protons of the AZO-Cage. 13 C NMR shows two peaks at the aliphatic region 57.8 and 52.5 ppm which are assigned to the cage carbons, while the five aromatic peaks representing the imine bond are seen at 161.4 ppm and 153-123 ( Figure S2). Initially, other than being an excellent recognition unit, including the azo group in the cage was intended to control the pore cavity with light/heat.…”

Ion Exchange Reversibility of Some Radionuclides on Zirconium Tungstosuccinate and Zirconium Tungstosalicylate at their Solid-Liquid Interfaces

“…Irrespective of the capacity values, which were obtained from the Langmuir and Freundlich isotherms, it is necessary to set these values of capacity by repeated saturation of ions when reversibility of ion exchange is considered (34,35). Table 3 lists the individually studied saturation capacities in meq of Cs þ , Co 2þ , and Eu 3þ per one g of ZWSu that were compared with the other ion exchange resins that adsorb the same ions nearly under similar conditions.…”

Benchmark selectivity p-xylene separation by a non-porous molecular solid through liquid or vapor extraction

“…, Table S1†). 7–11 Approaches such as fractional crystallization,12 adsorption,13 sieving,14 complexation,15 and isomerization16 have been employed to separate xylene isomers. With respect to adsorption, there is of great potential to reduce the energy footprint of C8 separations, but most sorbents exhibit low selectivity for the aforementioned reasons (Table S2†).…”

“…For example, the 0D non-porous coordination complex [Ni(NCS) 2 (ppp) 4 ]17 and the 2D layered coordination network sql-1-Co-NCS18 are the most selective sorbents for o X. The leading p X favoring sorbents are the 0D organic molecular EtP6 19 and the zeolite H/ZSM-5 13…”