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Kinetics and Mechanism for Alkaline Hydrolysis of Dinitrothiophene Disperse Dye(C. I. Disperse Green 9)

  • Textile Coloration and Finishing
  • Abbr : Text. Color. and Finish.
  • 2007, 19(4), pp.18-25
  • Publisher : The Korean Society Of Dyers And Finishers
  • Research Area : Engineering > Fiber Engineering > Dyeing Engineering

박건용 1 김재현 1

1청운대학교

Accredited

ABSTRACT

Kinetics and mechanism for alkaline hydrolysis of C. I. Disperse Green 9(G-9) of dinitrothiophene disperse dye were investigated. As soon as G-9 contacted with alkali, instant and continuous decreases of color strength of G-9 followed with increasing time. The hydrolysis rate of G-9 increased with increasing alkali, and it was found that alkali appeared first order dependence. The observed rate constants obtained from hydrolysis of various amount of dye were similar values, and calculation of initial rates showed that G-9 hydrolyzed by first order reaction for dye. Therefore it was confirmed that the overall reaction was second order, SN2 of nucleophilic substitution reaction. Increasing temperature enhanced the hydrolysis of G-9. From the results of hydrolysis performed at various temperatures, it was obtained that activation energy(Ea) was 12.6 kcal/mole, enthalpy of reaction(ΔH) was 12.0 kcal/mole, and entropy of reaction(ΔS) was 29.8 J/molK.

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