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Solution viscosity increase in fusion synthesis of Ca/Mg‐resinates
Author(s) -
Sundqvist S.,
Paatero E.,
Klemola A.,
Tenhola H.
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.690440719
Subject(s) - chemistry , viscosity , toluene , relative viscosity , volume (thermodynamics) , kinetics , thermodynamics , reduced viscosity , fusion , chromatography , analytical chemistry (journal) , organic chemistry , linguistics , physics , philosophy , quantum mechanics
The effect of Ca/Mg‐resinate concentration on solution viscosity was studied in toluene. The viscosity was observed to increase drastically above a specific concentration value. The change in viscosity dependence on concentration implies a transition from a dilute to a concentrated regime, where viscous dissipation is governed by resinate molecular interactions and excluded volume effects. The concept of critical resinate concentration, c crit , was applied and used to explain the nonlinear solution‐viscosity increase during the resinate synthesis. Ca/Mg‐resinates were synthesized by the fusion method at 265°C in a laboratory‐scale batch reactor. During the syntheses the increase in 50 wt. % toluene solution viscosity of the resinate turned almost exponential at a specific reaction time, denoted by t 50 . Based on the apparent reaction kinetics, a semiempirical model with two estimated parameters was derived for the solution viscosity to be used for the prediction of the t 50 , time of resinate syntheses.