Critical-fluid extraction of organics from water. Volume I. Engineering analysis. Final report, 1 October 1979-30 November 1983
Critical-fluid extraction of several organic solutes from water was investigated analytically and experimentally to determine the energy conservation potential of the technology relative to distillation. This Volume gives the results of an engineering analysis. The process uses condensed or supercritical carbon dioxide as an extracting solvent to separate aqueous solutions of common organics such as ethanol, isopropanol and sec-butanol. Energy input to the systems is electric power to drive compressors. A detailed process analysis included evaluation and correlation of thermophysical properties and phase equilibria for the two- and three-component systems involved. The analysis showed that a plant fed with 10 weight percent ethanol feed would consume 0.65 kilowatt-hours (kwh) of power for compression energy per gallon of alcohol. This energy consumption would be 5300 Btu of steam-equivalent, or 6500 Btu of fossil-fuel-equivalent energy. The extraction product, however, would require additional energy to produce high-purity alcohol. Doubling the ethanol feed concentration to 20 weight percent would reduce the energy required to about 0.30 kwh per gallon. Halving the ethanol feed concentration to 5 weight percent would increase the energy required to about 1.35 kwh per gallon. For the same feed composition, isopropanol can be separated with 48% of the energy required for ethanol. The same separation of sec-butanol can be done with 25% of the ethanol energy requirement.
- Research Organization:
- Little (Arthur D.), Inc., Cambridge, MA (United States)
- DOE Contract Number:
- AC01-79CS40258
- OSTI ID:
- 6697484
- Report Number(s):
- DOE/CS/40258-T1-Vol.1; ON: DE84012669
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALCOHOLS
SOLVENT EXTRACTION
SEPARATION PROCESSES
ENERGY CONSERVATION
BUTANOLS
CARBON DIOXIDE
DISTILLATION
ENGINEERING
ETHANOL
FLOWSHEETS
INDUSTRY
ORGANIC COMPOUNDS
PROPANOLS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
DIAGRAMS
EXTRACTION
HYDROXY COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
320303* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Equipment & Processes