Textile Coloration and Finishing (한국염색가공학회지)

The Korean Society of Dyers and Finishers (한국염색가공학회)
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Kinetics and Mechanism for Alkaline Hydrolysis of Dinitrothiophene Disperse Dye(C. I. Disperse Green 9)

디니트로티오펜계 분산염료인 C. I. Disperse Green 9의 알칼리 가수분해 반응속도 및 반응메카니즘

  • Park, Geon-Yong (Dept. of Fashion Design & Textile Eng., Chungwoon Univ.) ;
  • Kim, Jae-Hyoun (Dept. of Fashion Design & Textile Eng., Chungwoon Univ.)
  • 박건용 (청운대학교 패션디자인섬유공학과) ;
  • 김재현 (청운대학교 패션디자인섬유공학과)
  • Published : 2007.08.27
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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, $SN_2$ 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(${\triangle}H$) was 12.0 kcal/mole, and entropy of reaction(${\triangle}S$) was $29.8J/mol{\cdot}K$.

Keywords

References

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