TRPO-稀释剂萃取硝酸过程中三相形成机理的研究

STUDY ON THE MECHANISM OF THIRD PHASE FORMATION IN NITRIC ACID EXTRACTION BY TRPO

研究了ＴＲＰＯ－正辛烷萃取硝酸过程中三相形成的机理。测定了３０％ＴＲＰＯ－正十二烷、３０％ＴＲＰＯ－正辛烷、１５％ＴＲＰＯ－正辛烷萃取硝酸过程中水相酸度及有机相酸度、密度、组成及稀释剂对形成第三相的影响。提出了第三相形成是由于有机相中各组分形成了一个部分互溶体系，在一定条件下发生相分裂，从而导致第三相的形成。给出了ＴＲＰＯ－正辛烷萃取硝酸过程中有机相各组分的液－液平衡相图。

The formation of a third phase is studied in the system of TRPO n octane( n dodecane) with nitric acid aqueous solution.The acidity of the aqueous phase and the acidity,density and composition of the organic phase are measured.The influences of the diluents on the formation of the third phase are also studied.Proposed mechanism of third phase formation is that the components in the organic phase form a partial miscible system,in which the phase splitting can occur at a certain condition and the third phase can form.The liquid liquid equilibrium phase diagram of the components in the organic phase for the system of TRPO n octane with nitric acid aqueous solution was given.