The fractional extraction on Longkou lignite by different solvent was used for the studying of the occurrence modes and the variations of small molecular phases in coal.

Group separation of soluble organic compounds in wheat stalk can be achieved by fractional extraction.

Theoretical analysis of effective separation factor for multi-component rare earths in countercurrent extraction;

First, the relative flow rate of each outlet was calculated from the purification indexes, then the mass balance and extraction equilibrium of countercurrent extraction were studied.

Based on our previous work about the static design algorithm for the multi-component and multi-outlet rare earth countercurrent extraction, the computational program under 32-bit Windows operation system was composed and verified by the dynamic simulation for different rare earth separation systems with satisfactory results.

The vapour-liquid equilibrium composition on the various plates and the theoretical plate number of the plate tower, reaction volume of multistage continuous stir reactor and the theoretical stage number of multistage extraction can be calculated by this method.

Equations of optimized extraction factor for minimum production cost in counter current extraction;