Abstract

BENCHADLI, A. et al. Optimization of inhibition efficiencies process of polyvinylpyrrolidone using response surface methodology. Rev. mex. fis. [online]. 2022, vol.68, n.4, 041003.  Epub May 19, 2023. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.68.041003.

Inhibition efficiencies (IE) process in polyvinylpyrrolidone (PVP) which is influenced by independent factors, concentration and size of PVP, temperature, time of immersion and perchloric acid concentration on XC38 carbon steel was investigated in this paper. The relationship between factors and their responses is established by the concept of response surface methodology (RSM) explicitly through regression statistical analysis and probabilistic analysis is used in this work. The concept is a combination between mathematical and statistical techniques allowing the modeling and problems analysis by experimental design. In this study, the results based on statistical analysis showed that the quadratic models for the inhibition efficiencies (IE) was significant at value of probability P < 0.0001 and the coefficient of multiple regressions R2=0.9997, for further validation of the model, R2Adj = 0.9993 indicated a good model. The experimental observed values were in good agreement with predicted ones and the model was highly significant with Q2 = 0.884. The optimal conditions of inhibition efficiencies (IE) obtained are 104.301% for a concentration of 3.5510-3 mol/L, temperature of 20.15 °C, immersion time of 2h, size of PVP 58000g/mol and acid concentration of 0.5mol/L.

Keywords : Inhibition efficiencies; polyvinylpyrrolidone; acid perchloric; central composite face-centered design (CCFCD); response surface methodology.

        · text in English     · English ( pdf )