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Modeling and experimental study of a sequential phosphazene reaction by phase-transfer catalysis

✍ Scribed by Ho-Shing Wu; Shang-Shin Meng

Publisher
American Institute of Chemical Engineers
Year
1997
Tongue
English
Weight
818 KB
Volume
43
Category
Article
ISSN
0001-1541

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✦ Synopsis

The substitution reaction of hexachlorocyclotriphosphazene, N3 P3 CI,, with phenol was performed to synthesize the partially substituted (phenoxy) chlorocyclotriphosphazenes, N3 P3CI6 -i(OC6 Hs)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 coeficient 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.

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