Jing Ning-ren
2008
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Journal
Fine and Specialty Chemicals
Abstract
A new technology featuring clean production and economic synthesis is studied for manufacturing 2,5-diaminotoluene sulfate(2,5-TDAS)with high-purity,starting from o- toluidine(OT)through diazo-coupling,reductive hydrogenative cleavage and refine processes.The results show that the technology has the characteristics of less reaction procedures,lower cost and less pollutant,excellent product qualities and yield of 70%. Studied complex and decolorizing methods for waste water pretreatment are very efficient in clean synthesis,it makes obtaining decolorized,transparent waste water with COD below 2000.Developed recovery techniques for OT and 2,5-TDAS have good economical benefit. Using this technology to substitute current production route has a good prospect in developing 2,5-TDA series products exhibiting characteristics of energy economization,less emission and materials circulation economically.