Dechlorination of pentachlorophenol by grinding at low rotation speed in short time  

五氯酚在低转速短时间内球磨脱氯（英文）

作　　者：许芝 张晓宇 费庆志 

机构地区：[1]Department of Environmental and Chemical Engineering,Dalian Jiaotong University [2]Institute of Environmental Engineering Dalian Jiaotong University

出　　处：《Chinese Journal of Chemical Engineering》2015年第3期578-582,共5页中国化学工程学报（英文版）

摘　　要：In order to apply grinding method for degradation of pentachlorophenol(PCP) to an industrial scale,the proportion of different materials[CaO,SiO_2 and CO(NH_2)_2]and the size of grinding balls were examined.For saving energy and increasing dechlorination efficiency,the rotation speed and grinding time were maintained at relatively low values.At a mass ratio of grinding balls to materials(40:1),PCP was added into a big steel jar(300 ml) with other materials to grind at 300 r ·min^(-1)for 5 h.The results indicated that when PCP was mixed with CaO and SiO_2in a molar ratio of 1:60:60,the best dechlorination of 58.4%was achieved.CO(NH_2)_2 could not be used as hydrogen donor in the dehalogenation by mechanochemical reaction,since it restrained the dechlorination process.The size of grinding balls has significant effect on the reaction.The experiment with 5 mm steel balls indicates that the weight is too light to provide appropriate energy for the reaction,while steel balls of 10 and 15 mm could give better dechlorination reaction.It indicates that dechlorination depends on the mass of balls and fill rate.In order to apply grinding method for degradation of pentachlorophenol（PCP） to an industrial scale,the proportion of different materials[CaO,SiO2 and CO（NH2）2]and the size of grinding balls were examined.For saving energy and increasing dechlorination efficiency,the rotation speed and grinding time were maintained at relatively low values.At a mass ratio of grinding balls to materials（40：1）,PCP was added into a big steel jar（300 ml） with other materials to grind at 300 r ·min-1for 5 h.The results indicated that when PCP was mixed with CaO and SiO2in a molar ratio of 1：60：60,the best dechlorination of 58.4%was achieved.CO（NH2）2 could not be used as hydrogen donor in the dehalogenation by mechanochemical reaction,since it restrained the dechlorination process.The size of grinding balls has significant effect on the reaction.The experiment with 5 mm steel balls indicates that the weight is too light to provide appropriate energy for the reaction,while steel balls of 10 and 15 mm could give better dechlorination reaction.It indicates that dechlorination depends on the mass of balls and fill rate.

关 键 词：Dechlorination Pentachlorophenol Rotation speed Grinding time 

分 类 号：TQ243.3[化学工程—有机化工]