The solvent absorption-extractive distillation (SAED) process for ethanol recovery from gas/vapor streams

Conference · Fri Dec 31 04:00:00 EST 1993

OSTI ID:10157637

Dale, M C

A low energy system for ethanol recovery and dehydration has been developed. This system utilizes a solvent for (1) absorption of ethanol vapors, and then the same solvent for (2) extractive distillation. The ideal solvent for this process would have a high affinity for ethanol, and no affinity for water. Heavy alcohols such as dodecanol, and tridecanol, some phosphorals, and some fatty acids have been determined to meet the desired specifications. These solvents have the effect of making water more volatile than ethanol. Thus, a water stream is taken off initially in the dehydration column, and a near anhydrous ethanol stream is recovered from the ethanol/solvent stripper column. Thus the solvent serves dual uses (1) absorption media, and (2) dehydration media. The SAED process as conceptualized would use a solvent similar to solvents used for direct extractive separation of ethanol from aqueous ethanol solutions.

• Research Organization: Purdue Univ., Lafayette, IN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-85CE40772
• OSTI ID: 10157637
• Report Number(s): CONF-9303281--1; ON: DE94013112; BR: ED0102000/ED0113000
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303
320305
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105
ABSORPTION
AFFINITY
ALCOHOLS
CARBOXYLIC ACIDS
DISTILLATION
EQUIPMENT AND PROCESSES
ETHANOL
GASEOUS WASTES
INDUSTRIAL WASTE MANAGEMENT
SEPARATION PROCEDURES
SOLVENT EXTRACTION
SOLVENT PROPERTIES
THERMODYNAMICS