Development of polyion complex membranes for the separation of water–alcohol mixtures. III. Preparation of polyion complex membranes based on the k-carrageenan for the pervaporation separation of water–ethanol

✍ Scribed by Jonggeon Jegal; Kew-Ho Lee

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 538 KB
• Volume: 60
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/(sici)1097-4628(19960523)60:8<1177::aid-app10>3.0.co;2-#

✦ Synopsis

Pervaporation separation of water-ethanol was carried out with polyion complex membranes based on k-carrageenan. The polyion complex membranes were prepared by the ion complex formation between k-carrageenan (anionic polymer) and poly{ 1,3-bis[4-alkylpyridiniumlpropane bromide } s (cationic polymers) with different numbers of methylene units between two ionic sites within a repeating unit, respectively. The ion complex membranes were characterized with FT-IR, X-ray diffractometry. Dehydration of 90 wt % aqueous ethanol solution was carried out at different temperatures (30, 40, 50, and 60°C). The selectivity and permeability through them were very good over a wide temperature range; in the case of the polyion complex membrane consisting of k-carrageenan and poly{ 1,3bis[4-ethylpyridinium]propane bromide}, the permselectivity was 45,000 and permeability was 150 g/m2 h at 30°C. With increasing operating temperature, the permeability was increased highly but the selectivity decreased slightly.