Pervaporation of Water from Aqueous HI using Nafion®-117 Membranes for the Sulfur-Iodine Thermochemical Water Splitting Process

Journal Article · Fri Apr 01 04:00:00 EST 2005 · Journal of Membrane Science

OSTI ID:912387

Stewart, Frederick F; Orme, Christopher J; Jones, Michael G

Nafion®-117 membranes have been successfully used to remove water from aqueous hydriodic acid (HI) by pervaporation. HI feeds were concentrated from approximately 1.7 M to 5 M, and permeate concentrations ranged from 10-3 M to 10-4 M, regardless of the feed HI concentration. Temperatures examined were 22 °C, 50 °C, 70 °C, and 100 °C. Using 180 ìm thick films, fluxes at 22 °C were 0.43 Kg/m2h, and increased with increasing system temperature to a maximum of 1.5 Kg/m2h at 100 °C. Durability studies over a period of three months operation revealed little membrane degradation and, in all cases, the membranes retained their bulk physical properties in that they remained flexible and plastic. More intensive thermomechanical testing revealed changes in the membrane morphology upon pervaporation of the HI feed at 100 °C, however these changes were not reflected in the observed water transport behavior.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC07-99ID13727
• OSTI ID: 912387
• Report Number(s): INEEL/JOU-04-02410
• Journal Information: Journal of Membrane Science, Journal Name: Journal of Membrane Science Journal Issue: 1-2 Vol. 252; ISSN JMESDO; ISSN 0376-7388
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
HYDRIODIC ACID
Liquid separation
MEMBRANES
MORPHOLOGY
Nafion membranes
PHYSICAL PROPERTIES
TESTING
TRANSPORT
WATER
hydriodic acid
pervaporation
sulfur-iodine process
water separation