Preliminary results from bench-scale testing of a sulfur-iodine thermochemical water-splitting cycle
Portions of a bench-scale model of a sulfur-iodine thermochemical water-splitting cycle have been operated at General Atomic Company as part of a comprehensive program to demonstrate the technology for hydrogen production from nonfossil sources. The hydrogen program is funded by the US Department of Energy, the Gas Research Institute, and General Atomic Company. The bench-scale model consists of three subunits which can be operated separately or together and is capable of producing as much as 4 std liters/min (6.7 x 10/sup -5/ m/sup 3//s at standard conditions) of gaseous hydrogen. One subunit (main solution reaction) reacts liquid water, liquid iodine (I/sub 2/) and gaseous sulfur dioxide (SO/sub 2/) to form two separable liquid phases: 50 wt % sulfuric acid (H/sub 2/SO/sub 4/) and a solution of iodine in hydriodic acid (HI/sub x/). Another subunit (H/sub 2/SO/sub 4/ concentration and decomposition) concentrates the H/sub 2/SO/sub 4/ phase to the azeotropic composition, then decomposes it at high temperature over a catalyst to form gaseous SO/sub 2/ and oxygen. The third subunit (HI separation and decomposition) separates the HI from water and I/sub 2/ by extractive distillation with phosphoric acid (H/sub 3/PO/sub 4/) and decomposes the HI in the vapor phase over a catalyst to form I/sub 2/ and product hydrogen. This paper presents the results of on-going parametric studies to determine the operating characteristics, performance, and capacity limitations of major components.
- Research Organization:
- New Mexico State Univ., Las Cruces (USA); General Atomic Co., San Diego, CA (USA)
- DOE Contract Number:
- AC02-80ET26225
- OSTI ID:
- 5233267
- Report Number(s):
- GA-A-15935; CONF-801028-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
080102* -- Hydrogen-- Production-- Thermochemical Processes
BENCH-SCALE EXPERIMENTS
CHALCOGENIDES
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HALOGENS
HYDROGEN COMPOUNDS
HYDROGEN PRODUCTION
INORGANIC ACIDS
IODINE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PRODUCTION
SULFUR
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
SULFURIC ACID
THERMOCHEMICAL PROCESSES
WATER