Cross-linked HTPB-based polyurethaneurea membranes for recovery of ethyl acetate from aqueous solution by pervaporation

✍ Scribed by Yunxiang Bai; Jinwen Qian; Chunfang Zhang; Lin Zhang; Quanfu An; Huanlin Chen

• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 810 KB
• Volume: 325
• Category: Article
• ISSN: 0376-7388
• DOI: 10.1016/j.memsci.2008.09.019

✦ Synopsis

Cross-linked hydroxy terminated polybutadiene (HTPB)-based polyurethaneurea (PU), HTPB-DVB-PU, was synthesized by a three-step polymerization process. It was firstly used as membrane material to recover aroma, ethyl acetate (EA), from aqueous solution by pervaporation (PV). The effects of the content of cross-linker DVB, EA concentration in feed, and operating temperature on the PV performance of HTPB-DVB-PU membranes were investigated. The membranes demonstrated high EA permselectivity as well as high total flux. The introduction of DVB significantly enhanced the temperature resistance ability of the HTPB-DVB-PU membranes. With increasing DVB content, the separation factor increased while the total flux decreased a little. The best PV performance, separation factor and total flux were 655 and 256 g/m 2 h, respectively with feed concentration of 2.5 wt% EA at 30 • C. These PV performances with increasing DVB content were explained in terms of the viewpoint of chemical compositions and physical structures of the HTPB-DVB-PU membranes.