References
- Orhanic Chemistry in Colour P.E. Gordon;P. Gregory
- Colorant and auxiliaries v.23 J. Shore
- 염료화학 남성우;서보영;이대수
- Colorant and auxiliaries v.1 C. V. Stead;J. Shore(ed.)
Textile Coloration and Finishing (한국염색가공학회지)
- Volume 9 Issue 5
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- Pages.75-81
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- 1997
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- 1229-0033(pISSN)
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- 2234-036X(eISSN)
Modification of C.I. Acid Red 57 Synthesis Process
C.I. Acid Red 57의 제조공정 개선에 관한 연구
- Chung, Sang Woo (Dept. of Fiber and Polymer Science, Seoul National Univ., Seoul, Korea) ;
- Kim, Jae Pil (Dept. of Fiber and Polymer Science, Seoul National Univ., Seoul, Korea)
- Published : 1997.10.01
Abstract
o-Aminobenzene sulfone-N-ethylanilide, the diazo component of C.I. Acid Red 57, is currently being diazotised by the use of nitrosylsulphuric acid because of its high molecular weight and weak basicity. However, this method has many problems such as complicated manufacturing process and discharge of large volume of strong acidic effluent. In this study, the possibility of replacing nitrosylsulphuric acid method by direct method, which is simpler and produces less effluent, has been checked and the optimum process condition was studied. The effect of HCl concentration, the amount of sodium nitrite and particle size of diazo component on diazotisation yield was investigated. The optimum pH condition for coupling reaction was also evaluated.
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