Pervaporation Separation of p-/o-Xylene Mixtures Using HTPB-Based Polyurethaneurea Membranes
作者： Yunxiang Bai , Chunfang Zhang , Jin Gu , Lin Zhang , Yuping Sun
DOI: 10.1080/01496395.2011.579932
关键词:
摘要: Hydroxy terminated polybutadiene (HTPB)-based polyurethaneurea membranes with and without cross-linkage were synthesized first used as membrane material to separate p-/o-xylene mixtures by pervaporation. Compared HTPB-PU (without cross-linkage) membranes, HTPB-DVB-PU (cross-linked divinyl benzene) demonstrated a lower degree of swelling in xylene isomer solutions noticeable improved separation factor p-/o-xylene. On the other hand, amount p-xylene adsorbed increased significantly rather than that o-xylene. While but total flux decreased increasing DVB content, which can be ascribed chemical structure more homogeneous chain structures membranes. The normalized permeation rate reached 2.70 kgµm/m2h 2.23, respectively, at feed concentration 10 wt% 30°C.
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