The kinetics of corrosion of iron in acid and base medium by weight loss method was investigated. The corrosion kinetics was studied in sulphuric acid, nitric acid and potassium hydroxide by weight loss method at different time intervals at 25.0°C to 40.0°C. The result showed that the corrosion rate vary with different time interval and different acid – base concentration. The order of corrosion of iron in these media was found to be nitric acid > sulphuric acid > potassium hydroxide. Further the specific reaction rate, half-life time, energy of activation, entropy of activation and enthalpy of activation was also evaluated.

Depolymerization reaction of nylon waste was carried out by hydrolysis reaction. Yield of depolymerization products was up to 72.20% for a two-hour reaction time. The products obtained were characterized by melting point and FTIR spectra. The values obtained for dibenzoyl derivative of hexamethylenediamine (DBHMD) agreed with those of the pure substance. Chemical kinetics of this reaction shows that it is a first-order reaction with respect to hexamethylenediamine (HMD) concentration with velocity constant 7.32 × 10 −3 min −1 . The energy of activation and Arrhenius constant obtained by Arrhenius plot were 87.22 KJg −1 and 0.129, respectively. The other thermodynamic parameters such as enthalpy of activation (Δ ‡ ) and entropy of activation (Δ ‡ ) and free energy of activation were 5975.85 J and −270.86 J⋅K −1 ⋅mol −1 and 101.59 KJ⋅mol −1 , respectively.

No abstract

No abstract

No abstract