Kinetics of forward extraction of Ti(IV) from H_2SO_4 medium by P_(507) in kerosene using the single drop technique  

作　　者：ZHU Ping HONG Dai WU Jinhua QIAN Guangren 

机构地区：[1]College of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China

出　　处：《Rare Metals》2011年第1期1-7,共7页稀有金属（英文版）

基　　金：supported by the Key Subject of Shanghai Municipality (S30109);the Opening Project of Key Laboratory of Solid Waste Treatment and Resource Recycle (SWUST),the Ministry of Education (09zxgk02);Research Program of Science and Technology Commission of Shanghai Municipality (09dz1204403)

摘　　要：The kinetics of forward extraction of Ti（IV） from H2SO4 medium by P507 in kerosene has been investigated using the single drop technique.In the low concentration region of Ti（IV）,the rate of forward extraction at 298 K can be represented by F（kmol·m-2·s-1）=10-5.07 [TiO 2 ＋ ][H＋]-1 [NaHA 2 ]（o）·Analysis of the rate expression reveals that the rate determining step is（TiO）（i）2＋ ＋（HA 2）（i）-[TiO（HA2）]（i）＋.The values of Ea,H±,S±,and G±298 are calculated to be 22 kJ·mol-1,25 kJ·mol-1,-218 J·mol-1·K-1,and 25 kJ·mol-1,respectively.The experimental negative S± values indicate that the reaction step occurs via SN2 mechanism.The kinetics of forward extraction of Ti（IV） from H2SO4 medium by P507 in kerosene has been investigated using the single drop technique.In the low concentration region of Ti（IV）,the rate of forward extraction at 298 K can be represented by F（kmol·m-2·s-1）=10-5.07 [TiO 2 ＋ ][H＋]-1 [NaHA 2 ]（o）·Analysis of the rate expression reveals that the rate determining step is（TiO）（i）2＋ ＋（HA 2）（i）-[TiO（HA2）]（i）＋.The values of Ea,H±,S±,and G±298 are calculated to be 22 kJ·mol-1,25 kJ·mol-1,-218 J·mol-1·K-1,and 25 kJ·mol-1,respectively.The experimental negative S± values indicate that the reaction step occurs via SN2 mechanism.

关 键 词：TITANIUM solvent extraction reaction kinetics activation energy ENTHALPY ENTROPY 

分 类 号：O643.1[理学—物理化学] TQ028.8[理学—化学]