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In this article a new arrangement of extraction cascade—multiple stage counter-current extraction processwith alternating extraction and stripping is presented.The effects of increasing mass-transfer rate and decreas-ing the number of extraction stage in an extraction process may be obtained by adopting this new arrange-ment.Extraction cascade calculation for two extraction systems-extraction of iron with N,N-bis-(l-methl-heptyl)acetyl amide(N-503)* and extraction of H_3PO_4 with DBSO has been carried out and the experi-ment has been done with the former system.The results of calculation and experiment show that the extraction efficiency increases significantly byadopting this new alternating arrangement,compared with a commun multiple stage counter-current process.The new alternating extraction and stripping arrangement may be called alternating extraction process.
In this article a new arrangement of extraction cascade-multiple stage counter-current extraction process with alternating extraction and stripping is presented. These effects of increasing mass-transfer rate and decreas-ing the number of extraction stage in an extraction process may be obtained by adopting this new arrange ment. Extraction cascade calculation for two extraction systems-extraction of iron with N, N-bis- (l-methl-heptyl) acetyl amide (N-503) * and extraction of H_3PO_4 with DBSO has been carried out and the experi-ment has been done with the former system. The results of calculation and experiment show that the extraction efficiency increases significantly by adding this new alternating arrangement, compared with a commun multiple stage counter-current process. The new alternating extraction and stripping arrangement may be called alternating extraction process.