Pervaporation Separation of p-/o-Xylene Mixtures Using HTPB-Based Polyurethaneurea Membranes

作者：Bai, Yunxiang^*; Zhang, Chunfang; Gu, Jin; Zhang, Lin; Sun, Yuping; Chen, Huanlin

来源：Separation Science and Technology (Philadelphia), 2011, 46(11): 1699-1708.

DOI：10.1080/01496395.2011.579932

• chain structure
• cross-linker
• HTPB-based polyurethaneurea
• p=/o=Xylene mixtures
• PV membrane

Hydroxy terminated polybutadiene (HTPB)-based polyurethaneurea membranes with and without cross-linkage were synthesized and first used as membrane material to separate p-/o-xylene mixtures by pervaporation. Compared with HTPB-PU (without cross-linkage) membranes, HTPB-DVB-PU (cross-linked HTPB-PU with divinyl benzene) membranes demonstrated a lower degree of swelling in xylene isomer solutions and noticeable improved separation factor of p/o-xylene. On the other hand, the amount of p-xylene adsorbed in HTPB-DVB-PU membranes increased significantly rather than that of o-xylene. While the separation factor of p-/o-xylene increased but the total flux decreased with increasing DVB content, which can be ascribed to the improved chemical structure and more homogeneous chain structures of the HTPB-DVB-PUmembranes. The p-xylene normalized permeation rate and separation factor of p-/o-xylene of HTPB-DVB-PU membrane reached 2.70 kg mu m/m(2) h and 2.23, respectively, at a feed concentration of 10wt% p-xylene at 30 degrees C.

• 出版日期2011
• 单位浙江大学; 江南大学