Membrane Separation Processes for the Benefit of the Sulfur-Iodine and Hybrid Sulfur Thermochemical Cycles

Journal Article · Fri May 01 04:00:00 EDT 2009 · International Journal of Hydrogen Energy

DOI:https://doi.org/10.1016/j.ijhydene.2008.06.046· OSTI ID:956725

Orme, Christopher J; Klaehn, John R; Stewart, Frederick F

Thermochemical cycles have been proposed as processes for the manufacture of hydrogen from water in which the only effluent is oxygen. In this paper, membrane-based technologies are described that have the promise of enabling the further development of thermochemical cycle processes. In direct service of the sulfur-iodine (S-I) cycle, membranes have been studied for the concentration of HI and sulfuric acid using pervaporation. In this work, Nafion® and SPEEK membranes have effectively concentrated both acids at temperatures as high as 134 ºC without any significant degradation. Measured fluxes of water and separation factors are commercially competitive and have been characterized with respect to acid concentration in the feed streams. Further, hydrogen permeability is discussed at 300 ºC with the goal of providing a method for the removal of the product gas from HI in the decomposition step, thus increasing the productiveness of the equilibrium limited reaction.

• Research Organization: Idaho National Laboratory (INL)
• Sponsoring Organization: DOE - NE
• DOE Contract Number: AC07-99ID13727
• OSTI ID: 956725
• Report Number(s): INL/JOU-07-12203
• Journal Information: International Journal of Hydrogen Energy, Journal Name: International Journal of Hydrogen Energy Journal Issue: 9 Vol. 34; ISSN 0360-3199; ISSN IJHEDX
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
HYDROGEN
MEMBRANES
Nafion
OXYGEN
PERMEABILITY
REMOVAL
SEPARATION PROCESSES
SULFUR
SULFURIC ACID
Sulfur-iodine cycle
WATER
membranes
pervaporation