3'-disulfonic acid(DAS) by Ullmann coupled reaction were investigated.Organic solvent can be recycled to avoid significant emissions of acidic and salty wastewater produced in the industrial synthetic methods.The effects of different kinds of single solvents
mixed solvent with different composition and proportion were studied.The results showed that the mixed solvent system of DMF:methanol=1:2 was the best.The experiments to find out the optimal factors such as reaction time
temperature were conducted.The influence of additives and different particle sizes of copper powder was researched.The results indicated that the cation exchange resin can improve the content and yield of DAS and can be easily separated from the reaction system.The copper powder(23 μm) was optimal with the best catalytic performance.The highest content and yield of DAS was 91.56% and 88.43%