Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10262556 | Chemical Engineering Science | 2011 | 8 Pages |
Abstract
This paper reports on determination of the intrinsic reaction kinetics in reactive extraction of α-cyclohexyl-mandelic acid (α-CHMA) enantiomers with hydroxypropyl-β-cyclodextrin (HP-β-CD) in a modified Lewis cell, in which HP-β-CD dissolved in 0.1 mol/l NaH2PO4/H3PO4 buffer solution was selected as chiral extractant. α-CHMA enantiomers were extracted from an organic phase to an aqueous phase in the extraction module. The theory of extraction accompanied by chemical reactions has been used to obtain the intrinsic kinetics of this extraction module. The different factors affecting the extraction rate, such as agitation speed, interfacial area, initial enantiomers concentration in an organic phase as well as HP-β-CD concentration in an aqueous phase were separately studied. The experimental results demonstrate that the extraction reaction kinetics is fast. The reactions between α-CHMA enantiomers and HP-β-CD in a stirred cell fall in regime 3 and are first order with respect to α-CHMA enantiomers and second order with respect to HP-β-CD with forward rate constants of 6.9Ã10â2 m6/(mol2 s) and 2.5Ã10â2 m6/(mol2 s) for S-α-CHMA and R-α-CHMA, respectively. These data will be useful in the design of the extraction process.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Kewen Tang, Jiabing Miao, Tao Zhou, Yongbing Liu, Litao Song,