Research and development on membrane processes for removal of acid gases during coal gasification. Final report, 20 June 1975-19 October 1976
The object of this program was to develop novel and unique membranes for separating acid gases from coal gasification streams. Many candidate membranes, including cationic, hydrophilic, and silicone, were tested. Optimum separation properties were possessed by membranes formulated from crosslinked methyl cellulose coated on polysulfone support films. The observed separation properties were explained theoretically by the solubility of the various gases in the water contained within the membranes rather than by activated transport. Each of the acid gas clean-up processes considered required additional sulfur clean-up, a guard chamber, and a Claus plant for recovering sulfur. These additional costs were calculated and added to the base costs for acid gas removal from the raw SNG. When the additional costs were added to the costs of the Rectisol, Benfield, Sulfinol, and fluidized dolomite processes the total costs ranged from 43 to 49 cents/Mscf. For the membrane process the additional sulfur removal costs were about 3.3 cents/Mscf to be added to the base costs for acid gas removal. The best membrane composition found during this program, one which exhibited a CO/sub 2//H/sub 2/ selectivity of 13 at a CO/sub 2/ flux of 6 ft/sup 3//ft/sup 2/-hr-100 psi, would entail a process cost of about 53 cents/Mscf with these additions. This is about 7 cents/Mscf more than for the average of the other processes. No better membrane performance is predicted on the basis of the experiments performed. Without a shift in several cost factors, membranes cannot be competitive. The possibility that reduced energy availability could lead to such shifts should not be discounted but is not foreseen in the near future.
- Research Organization:
- Midwest Research Inst., Minneapolis, MN (USA); Energy Research and Development Administration, Washington, DC (USA)
- DOE Contract Number:
- AC01-76ET10530
- OSTI ID:
- 5324726
- Report Number(s):
- DOE/ET/10530-T1; ON: DE82015197
- Resource Relation:
- Other Information: Portions of document are illegible
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cryogenic methane separation/catalytic hydrogasification process analysis. First quarter report, 15 October 1978-15 January 1979
Cryogenic methane separation/catalytic hydrogasification process analysis. First quarter report, October 15, 1978-January 15, 1979
Related Subjects
CARBON DIOXIDE
REMOVAL
FUEL GAS
PURIFICATION
HYDROGEN SULFIDES
MEMBRANES
ECONOMICS
MATERIALS
RESEARCH PROGRAMS
BENFIELD PROCESS
CLAUS PROCESS
COAL GASIFICATION
COMPARATIVE EVALUATIONS
FABRICATION
OPTIMIZATION
RECTISOL PROCESS
SEPARATION PROCESSES
SULFINOL PROCESS
TECHNOLOGY ASSESSMENT
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
FLUIDS
FUELS
GAS FUELS
GASES
GASIFICATION
HYDROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
010402* - Coal
Lignite
& Peat- Purification & Upgrading
010404 - Coal
Lignite
& Peat- Gasification