核壳型钕铁硼琼脂糖载体的制备及其膨胀床特性  

Preparation and Characterization of Nd-Fe-B Alloy-densified Agarose Matrices for Expanded-bed Operation

作　　者：佟晓冬[1] 孙彦[1] 

机构地区：[1]天津大学化工学院生物化工系,天津300072

出　　处：《过程工程学报》2002年第3期199-203,共5页The Chinese Journal of Process Engineering

基　　金：国家杰出青年科学基金资助项目(编号: 20025617)

摘　　要：利用油水乳化法以琼脂糖为壳层材料包埋钕铁硼合金颗粒,制备得到一种新型高密度核壳型钕铁硼琼脂糖载体,并且与商品化膨胀床介质Streamline SP进行了比较. 结果表明,这种载体在膨胀床内的膨胀行为可以用Richardson-Zaki方程来描述. 流速和填充高度的增加都会引起床内轴向混合程度的降低,钕铁硼琼脂糖载体在膨胀床内的轴向混合程度小于Streamline SP.Novel dense composite matrices have been prepared by coating 4% agarose gel onto NdFeB alloy particles by a water-in-oil emulsification method, and NdFeB alloy-densified agarose (NFBA) gels with different size distributions and densities, NFBAS (50~165 mm, 1.88 g/ml) and NFBAL (140~300 mm, 2.04 g/ml), were obtained. The expansion characteristics of the expanded bed with new matrices were found in accordance with the RichardsonZaki equation. It allowed flow rate up to 154 cm/h for the NFBAS and 660 cm/h for the NFBAL to reach twofold bed expansion. Liquid-phase dispersion behavior in the expanded bed was examined by measurements of residence time distribution. It is shown that the axial dispersion level decreased with increasing flow rate or settled bed height. Moreover, the beds with the NFBA matrices have smaller axial dispersion level compared with that of Streamline SP. The results indicate that the NFBA gels exhibited promising properties for expanded bed operation.

关 键 词：高密度吸附剂 钕铁硼 琼脂糖 膨胀床 膨胀性能 轴向混合程度 

分 类 号：TQ051.1[化学工程]