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Intensification of instantaneous heterogeneous reaction by simple salts and charged microphase
Author(s) -
Hasnat Abul,
Roy Sandip
Publication year - 1998
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.690440314
Subject(s) - chemistry , ammonium bromide , electrolyte , pulmonary surfactant , mass transfer , aqueous solution , micelle , phase (matter) , ionic bonding , ion , inorganic chemistry , cationic polymerization , ammonium , bromide , thermodynamics , analytical chemistry (journal) , chemical engineering , chromatography , polymer chemistry , organic chemistry , biochemistry , electrode , physics , engineering
The mass‐transfer rate for the instantaneous heterogeneous reaction between N,N‐di‐ethylaniline (organic phase) and HCl in the aqueous phase was determined in the presence of a number of supporting electrolytes, that is, NaCl, SrCl 2 , AlCl 3 , and cetyltrimethyl ammonium bromide surfactant micelle. Both the simple salts and the cationic surfactant enhance the mass transfer of the reactive H + ion, the effectiveness being in the order of CTAB > AlCl 3 > SrCl 2 > NaCl. The experimentally observed enhancement factor for the reaction in the presence of the supporting electrolytes ranges from 1.3 to 6. This enhancement is explained on the basis of the “ion‐coupling” effect that augments the diffusive fluxes of the more mobile ionic species in a multi‐ion system. The film‐theory approximation is used to obtain theoretical estimates of the enhancement factor, and these are found to be in reasonably good agreement with the experimentally obtained values.