Under the background of rapid development of polypropylene industry in China,sulfur,as a harmful impurity in the propylene polymerization,has a negative effect on the quality of polypropylene product and the normal operation of the plant,therefore,how to effectively remove harmful impurities such as sulfur in propylene has become a key problem.This study utilized the co-precipitation method,employing zinc nitrate hexahydrate[Zn(NO3)2·6H2O]and aluminum chloride hexahydrate(AlC13·6H2O)as the active component and carrier,respectively,with sodium carbonate(Na2CO3)as the precipitant,to successfully develop an efficient zinc-based room temperature desulfurizer.After single-factor experiments,the optimum conditions were determined as follows:a reaction temperature of 60 ℃,a molar ratio of zinc to aluminum of 4∶1,a molar ratio of zinc and aluminum to precipitator of 1∶1.3,a concentration of zinc salt of 0.75 mol/L and a calcination temperature of 300 ℃.The permeation capacity of the desulfurizer reached 22.69％.Further analyses revealed that the precursor of the desulfurizer was basic zinc carbonate.The optimum calcination temperature was 300 ℃,at which the desulfurization activity was the highest(penetration sulfur capacity was 22.69％)and the pore structure and properties were excellent(specific surface area of 67.63 m2/g,pore volume of 0.202 cm3/g,average pore diameter of 10.94 nm).The performance evaluation at 25 ℃ showed that the desulfurizer exhibited excellent desulfurization effect,with a penetration time of 6 00 min and a penetration capacity of 23.17％.
关键词
共沉淀法/常温锌基脱硫剂/硫化氢
Key words
coprecipitation method/zinc-based room temperature desulfurizer/hydrogen sulfide
维普
万方数据