Yin-Liang Guan
2011
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Journal
Fine chemicals
Abstract
The method of liquid sulfonation in o-dichlorobenzene as a solvent was used in place of the solid baking sulfonation.Sodium 1-amino-4-naphthalene sulfonate was prepared through ammonium salifying of 1-naphthylamine and sulfuric acid,and then through transposition sulfonation and salifying(Na2CO3) in the presence of Tween-60 as surfactant and o-dichlorobenzene as solvent.The effects of the solvents,the sulfonation reaction time,surfactants,recycling times of mother liquor on the reaction were investigated.The optimum conditions were ascertained as follows:1-naphthylamine 35.8 g,mass fraction 80% sulfuric acid 33.6 g,o-dichlorobenzene 150 mL,Tween-60 1.5 g,sulfonation time 6 h,under which the yield of sodium 1-amino-4-naphthalene sulfonate was 90.6%.