The synthesis of n-octyl bromide with hydrobromic acid and n-octyl alcohol as reactants and rare earth solid super acid S2O82-/ZrO2-SiO2-Sm2O3as catalyst is studied.The results show that the optimum conditions should be∶n(hydrobromic acid)∶n(n-octyl alcohol)=4.2∶1.0,the amount of the catalyst is 1.5% of the total weight of the reactants used in the reaction,the reaction time is 5.0h and the temperature is 130～140℃.The yield of n-octyl bromide is about 66.8%.The catalyst can be reused after being activated and the yield of n-octyl bromide is reduced to 64.3% after being used 6 times.The structure of the product is identified by methods of IR and 1H-NMR.The effective factors of the preparation conditions to the catalyst activity are also investigated by the esterification of actic acid with butanol.The catalyst is characterized by XRD and FI-IR.
The rare-earth solid superacids-SO 2- 4/TiO 2/La 3+ were prepared by precipitation and impregnation and were characterized by IR,XRD and Hammett indicator.The synthesis of ethyl phenylacetate with ethanol and phenylacetic acid as reactants and rare-earth solid superacid SO 2- 4/TiO 2/La 3+ (La 3+ concentration of the soak solution:0 07mol·L -1 ,the calcination temperature:500℃ and the calcination time:3h)as catalyst was studied.The results showed that the appropriate conditions were as follow:mass of catalyst 1 0g(based on 0 05 mole phenylacetic acid),n(ethanol):n(phentlacetic acid)=4 0∶1 0,reaction time 5 0h.The yield of ethyl phenylacetate was about 89 8%.
