Premium
Modeling and experimental study of a sequential phosphazene reaction by phase‐transfer catalysis
Author(s) -
Wu HoShing,
Meng ShangShin
Publication year - 1997
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690430519
Subject(s) - chemistry , catalysis , steric effects , phosphazene , phase (matter) , mass transfer , reaction rate constant , aqueous solution , phenol , kinetics , reaction rate , thermodynamics , organic chemistry , chromatography , physics , quantum mechanics , polymer
The substitution reaction of hexachlorocyclotriphosphazene, N 3 P 3 Cl 6 , with phenol was performed to synthesize the partially substituted (phenoxy) chlorocyclotriphosphazenes, N 3 P 3 Cl 6 − i (OC 6 H 5 ) i , i = 1 – 6 by phase‐transfer catalysis (PTC) in an organic phase/alkaline solution. The steric hindrance effect plays a crucial role in this reaction. The reaction system was controlled by both chemical kinetics and mass‐transfer effects. The mass transfer of the catalyst between two phases was investigated by a pseudosteady‐state liquid–liquid PTC (LLPTC) model. Also, the intrinsic reaction‐rate constants of the series substitution and the overall mass‐transfer coefficient of the catalyst from the organic phase to the aqueous phase were determined by a combined model. In addition, the corresponding energies, enthalpies, and entropies of activation of the series substitution were also estimated.