B. Xue
2010
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Journal
The Chemical Engineer
Abstract
Using water as solvent,4-Bromotoluene and 2-bromotoluene were synthesized which were prepared with bromum and toluenel.Hydrobromic acid was also recovered.The optimum reaction condition is under a 1∶1 molar ratio of n(Toluenel)∶n(Bromum) =1∶1 at 20~25℃ for 2.5 h,under which the yield of 4-Bromotoluene is 66.4%,the yield of 2-Bromotoluene is 24.7%,hydrobromide content is 44%~46%,the yield is 80%.Compared with the diazonium salt,the process method is characterized by low-priced raw materials,and the atomic use factor achieves 100% nearly,and the water,the sulfuric acid and the iron can be recycled repeatedly,the entire technological process realize zero emission basically,thus reduce the cost of material greatly,raised the economic efficiency greatly;it do not pollute the environment,which belongs to the environment friendly green chemical technology;The craft is easy,the equipment is simple,suits in the formalization production.