Thermodynamics of ion exchange in a sulfonated polymer based on cis-tetraphenylmetacyclophanoctol

Al'tshuler, G. N.; Ostapova, E. V.; Sapozhnikova, L. A.; Altshuler, O. G.

doi:10.1007/s10973-008-9011-5

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…[LA] and [LA] 0 represent the concentrations of levulinic acid at time t and time zero, respectively. The proton (H + ) exchange of Amberlyst-36 with monovalent cations (I + ) is based on the balance 28,29…”

Section: Methodsmentioning

confidence: 99%

“…The proton (H + ) exchange of Amberlyst-36 with monovalent cations (I + ) is based on the balance , where the subscripts S and L represent the solid and liquid phases, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The ion-exchange equilibrium constant K r is defined as , It follows the Gibbs–Helmholtz equation , where R is the universal gas constant; Δ H r is the ion-exchange enthalpy, which shows the energy variation during cation exchange at a constant temperature; and T is the temperature.…”

Section: Methodsmentioning

confidence: 99%

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Kinetic Analysis on Deactivation of a Solid Brønsted Acid Catalyst in Conversion of Sucrose to Levulinic Acid

Tang

2014

Ind. Eng. Chem. Res.

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A solid Brønsted acid (Amberlyst-36) was used as a catalyst in the formation of levulinic acid from sucrose in aqueous solutions. Its rapid deactivation was investigated and simulated. Two major catalyst deactivation mechanisms were identified: (a) loss of protons due to ion exchange with cations and (b) blocking of the catalyst surface or active sites by byproducts. The catalyst activity declined with the accumulation of the byproducts, whereas the effect of ion exchange was quite complicated. The catalyst actually exhibited an increased activity with a small extent of ion exchange, because the free protons had a higher activity than those associated with the solid matrix. In repeated use, however, the solid catalyst lost most protons and activity. A first-order kinetic model was modified to characterize the deactivation mechanisms that provides a good simulation of the complicated performance of the solid catalyst in sugar solutions.

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Section: Methodsmentioning

confidence: 99%

“…The proton (H + ) exchange of Amberlyst-36 with monovalent cations (I + ) is based on the balance , where the subscripts S and L represent the solid and liquid phases, respectively.…”

Section: Methodsmentioning

confidence: 99%

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Kinetic Analysis on Deactivation of a Solid Brønsted Acid Catalyst in Conversion of Sucrose to Levulinic Acid

Tang

2014

Ind. Eng. Chem. Res.

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Nanoreactor Effect in Bifunctional Cation Exchangers Based on Cis-Metacyclophanoctol

Al'tshuler

Altshuler

2011

JAC

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The nanoreactor effect consisting in sufficiently high rate increase of a cation diffusion flux in bifunctional cation exchangers based on cis-metacyclophanoctol has been found. The solutions of the fundamental differential equation of cation diffusion in bifunctional cation exchangers containing sulfonic acid and phenol ionogenic groups by means of the spherical layer and plane sheet models are presented for a variety of initial and boundary conditions with constant diffu-sion coefficient.

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Modeling of cation diffusion in bifunctional polymers based on cis-tetraphenylcalix[4]resorcinarene

Al'tshuler

Altshuler

2011

Eur. J. Chem.

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KEYWORDSIn this study, we report that interaction of the network functional polymers based on cistetraphenylcalix[4]resorcinarene with aqueous solutions of electrolytes is controlled by diffusion of ions in a polymeric phase. The nanoreactor effect consisting in sufficiently high rate increase of a cation diffusion flux in bifunctional polymers containing sulfonic acid and phenol ionogenic groups has been found. For steady and non-steady states the solutions of the fundamental differential equation of cation diffusion in bifunctional polymers by means of the spherical layer model are obtained for a variety of initial and boundary conditions with constant diffusion coefficient. The proposed mathematical model explains the nanoreactor effect in bifunctional polymers. Cis-tetraphenylcalix[4]resorcinareneBifunctional polymers Ion exchange kinetics Cation diffusion Mathematical model Nanoreactor effect

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Thermodynamics of ion exchange in a sulfonated polymer based on cis-tetraphenylmetacyclophanoctol

Cited by 4 publications

References 8 publications

Kinetic Analysis on Deactivation of a Solid Brønsted Acid Catalyst in Conversion of Sucrose to Levulinic Acid

Kinetic Analysis on Deactivation of a Solid Brønsted Acid Catalyst in Conversion of Sucrose to Levulinic Acid

Nanoreactor Effect in Bifunctional Cation Exchangers Based on Cis-Metacyclophanoctol

Modeling of cation diffusion in bifunctional polymers based on cis-tetraphenylcalix[4]resorcinarene

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