Preparation of polysulfone microcapsules containing 1-octanol for the recovery of caprolactam

Authors: Gong, Xingchu; Lu, Yangcheng; Xiang, Ziying; Luo, Guangsheng

Source: Journal of Microencapsulation, Volume 26, Number 2, March 2009 , pp. 104-110(7)

Buy & download fulltext article:

Price: $34.29 plus tax (Refund Policy)

Abstract:

Polysulphone (PSF) microcapsules containing 1-octanol were prepared with solvent extraction method for the recovery of caprolactam. One-step and two-step processes were, respectively, applied to prepare microcapsules. In order to get high extractant loading, a loading method with the assistance of ultrasound has been developed. With the two-step preparation process the extractant loss can be avoided. A very high extractant loading ratio of 5.96 g g-1 and the maximum uptake to caprolactam of 65.6 mg g-1 were achieved. Under the action of ultrasound the extractant loading efficiency is greatly intensified. With the one-step process 1-octanol loading ratio is highly limited. Only 1.74 g g-1 loading ratio and 29.9 mg g-1 uptake to caprolactam were realized. Meanwhile the extractant loss in the one-step process is serious. Considering extraction capacity and extractant loss in the preparation process, it is suggested that PSF microcapsules containing 1-octanol should be prepared with the two-step process. To fasten mass transfer rate, microcapsules with relatively smaller size are desired.

Keywords: Microcapsule; preparation method; extraction; octanol; caprolactam

Document Type: Research article

DOI: http://dx.doi.org/10.1080/02652040802176357

Affiliations: 1: Department of Chemical Engineering, The State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing, China

Publication date: 2009-03-01

More about this publication?