Abstract
Response surface methodology (RSM) was employed to model and optimize an improved Zinin reduction of a nitroarene, p-nitroacetophenone (p-NAP), by hydrogen sulfide (H2S) under biliquid phase transfer catalysis. A novel Zinin reagent, H2S laden aqueous N-methyldiethanolamine (MDEA) solution, was prepared and used for this purpose. A quadratic regression model was tested with a multivariate experimental design based on the relationship between p-NAP conversion (response) and four independent variables—temperature, catalyst concentration, p-NAP–sulfide mole ratio, and MDEA concentration. The optimum values of the independent variables were found as temperature 339.45 K, catalyst concentration of 0.082 kmol/m3, p-NAP/sulfide mole ratio of 0.452, MDEA concentration of 2.20 kmol/m3, and maximum p-NAP conversion of 96.31% has been attained. The analysis of variance (ANOVA) has been used to evaluate the goodness of the fit of the model, and the desirability function has been used to find the value of the optimize...
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