It s testified by using theory of limit value that the sum of modification coefficients xE is more than the separate coefficient of normal pitch circle y at modified gearing of working pressure angle.

And the degree of difficulty of separation ( q u) was used to correlate the parameters for ternary systems.

The separation coefficient of light rare earth was lower in P204(DEHPA)-HCl system at high acidity.

The effects of the feed acidity and citric acid(H3cit) concentration on the distribution ratio and the separation coefficient of Ce(Ⅲ) and Pr(Ⅲ) and the extraction capacity were investigated in P204-HCl-H3cit system.

In the extraction process of light rare earth chloride with P204,the separation coefficient of La(Ⅲ),Ce(Ⅲ),Pr(Ⅲ) and Nd(Ⅲ)is lower at high acidity.

We present a new concept of separate coefficient and a new method to decide indicator weights.

Variation of CO_2 permeance and CO_2/CH_4 selectivity of the membranes were investigated against the factors such as thioglycolic acid,ammonia and glutaraldehyde content in the casting solutions.

47×10-7 mol/(m2·s·Pa) and the ideal selectivity of H2/SF6 reached to 44 at 40 ℃.

The determination of separation factor β(WO_4~2/ SO_4~2) in ion-exchange process of Na_2WO_4 solution;

The separation factor of N_(2)/O_(2) was calculated in terms of the breakthrough curves of N_(2) and O_(2).

In view of low separation factor of La(Ⅲ) and Ce(Ⅲ) in P204-HCl system,study was made of the effects of the feed solution acidity and citric acid(H3cit) concentration on the distribution ratio and the separation factor of La(Ⅲ) and Ce(Ⅲ)and the extraction capacity.