Optimization of the Synthesis Process of Cationic Yellow X-5GL
The synthesis process of Cationic Yellow X-5GL was optimized.Based on product purity(HPLC),relative strength and shade of the dye,the effect of sulfuric acid content in diazotization reaction,coupling reaction temperature,temperature of dye crystal-line forms,and pH of salting out on the dye was analyzed by single factor experiments.The optimal preparation process for the dye was obtained as follows:sulfuric acid content in the diazotization reaction was 9%,coupling reaction temperature was 0℃,temperature of dye crystalline forms was 40℃,and pH of salting out was 5.In the conditions,the purity of the Cationic Yellow X-5GL was 98.94%,strength was 670%,and the shade was from no difference to a value of green 0.05.
Cationic Yellow X-5GLdiazotization reactioncoupling reactionsalting out
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