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
- Resource Relation:
- Conference: 20. joint AICHE-IMIQ meeting, Acapulco, Mexico, 15 Oct 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
HYDROGEN PRODUCTION
BENCH-SCALE EXPERIMENTS
THERMOCHEMICAL PROCESSES
IODINE
OXYGEN
PRODUCTION
SULFUR
SULFUR DIOXIDE
SULFURIC ACID
WATER
CHALCOGENIDES
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HALOGENS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SULFUR COMPOUNDS
SULFUR OXIDES
080102* - Hydrogen- Production- Thermochemical Processes