title: Preparation of polysulfone microcapsules containing 1-octanol for the recovery of caprolactam.
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.
authors.affiliation: Department of Chemical Engineering, The State Key Laboratory of Chemical Engineering, Tsinghua University, Beijing, China.
authors.forename: Xingchu
authors.initials: X
authors.lastname: Gong
authors.forename: Yangcheng
authors.initials: Y
authors.lastname: Lu
authors.forename: Ziying
authors.initials: Z
authors.lastname: Xiang
authors.forename: Guangsheng
authors.initials: G
authors.lastname: Luo
mesh_terms: D020003:1-Octanol / Q000737:chemistry*; D002209:Caprolactam / Q000737:chemistry* / Q000302:isolation & purification; D002214:Capsules / Q000737:chemistry*; D002621:Chemistry / Q000379:methods; D002845:Chromatography / Q000379:methods; D004339:Drug Compounding / Q000379:methods; D004867:Equipment Design; D007700:Kinetics; D008855:Microscopy, Electron, Scanning; D010100:Oxygen / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013450:Sulfones / Q000737:chemistry*
chemical_list: D002214:Capsules; D011108:Polymers; D012997:Solvents; D013450:Sulfones; C017662:polysulfone P 1700; D002209:Caprolactam; D020003:1-Octanol; D010100:Oxygen