A THEORETICAL-MODEL FOR PHASE-TRANSFER-CATALYZED REACTION WITH THE 3RD-LIQUID PHASE

Authors
Citation
Hm. Yang, A THEORETICAL-MODEL FOR PHASE-TRANSFER-CATALYZED REACTION WITH THE 3RD-LIQUID PHASE, Zhongguo gongcheng xuekan, 21(4), 1998, pp. 399-408
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Engineering
Journal title
Zhongguo gongcheng xuekan
ISSN journal
0253-3839 → ACNP
Volume
21
Issue
4
Year of publication
1998
Pages
399 - 408
Database
ISI
SICI code
0253-3839(1998)21:4<399:ATFPRW>2.0.ZU;2-X
Abstract
The behaviors of phase transfer catalysts under the formation of a thi rd-liquid phase were analyzed in the present work. A mathematical mode l concerning mass transfer with reaction in an organic droplet was dev eloped. The third-liquid phase was considered to form between the aque ous/organic interface. The diffusion resistance of active intermediate (QY) in the catalyst phase and mass transfer resistance between the d roplet and the bulk aqueous phase were all considered. The surface con version factor (psi) and mass Blot number (Bi) were defined to interpr et their relative importance on the overall reaction rate. The system equations were solved by finite difference and fourth-order Runge-Kutt a methods. From the simulation results, the conversion increases with increasing Bi and decreases with increasing psi. The overall reaction rate is influenced not only by the diffusivity of organic reactant but also by its surface reaction rate. In addition, the diffusion rates o f QY and QX in the third liquid phase are not important to the overall reaction rate because QY and QX are highly concentrated within the th in catalyst layer. These results exhibit the phenomena of phase transf er reaction catalyzed by the third-liquid phase.