A Datyner

BR Craven

TP Doyle

The presence of nonylphenol-poly(oxyethylene)
surfactant decreases the rate constant for the
hydrolysis of a monochlorotriazine dye, the effect
being enhanced by increasing the surfactant to dye ratio and diminishing by
increasing the temperature. At 80� and 100�, the longer the ethylene oxide
chain length of a surfactant the more effective it is in reducing the rate
constant. At 60�, however, all of the surfactants used appear to be equally
effective. At 80� and 100�, extrapolation of rate constants to zero surfactant
to dye ratio gives a value very close to the rate constant in the absence of
surfactant, but at 60� the rate constant for NPl0
extrapolated to zero surfactant to dye ratio is close to the value from the
surfactant-free run, but values obtained with the
other surfactants are much higher and similar to that obtained in presence of a
polyether glycol. It is suggested that this anomaly is due to the initial
aggregation of the dye at 60� so that the addition of small quantities of
surfactant other than NPl0 causes initial disaggregation and an increase in the rate of hydrolysis.
Further increases in the amount of surfactant cause dye-surfactant complex
formation which produces a decrease in the rate of hydrolysis. 







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Rates of hydrolysis of a monochlorotriazine dye in presence of non-ionic surfactant

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