2. The experimental results from a simulated 3-stage countercurrent extraction scheme were qualitatively predicted by the theoretical calculations. Gasohol with 90 to 96% ethanol recovery can be produced at room temperature if a 90 wt % ethanol feed is used.3. Solvency of the extractive solvent is directly proportional to the aromatics content in the solvent. However, the higher the solvency, the higher the water content in the product gasohol. Even a minor amount of water in gasohol will create a phase separation in colder climates.4. Experiments were also successful for producing gasohol in a 1.5-in. i.d. continuous column. Gasohol with 91.4% ethanol recovery was produced at 108 °F with unleaded gasoline. Increasing extraction temperature from 75 to 108 °F, the water content in gasohol increased only 0.1 wt %. The ethanol recovery can be further improved by use of a longer extraction column.5. Both molecular sieve absorption and chemical treatment can be effectively used to remove the minor amount of water in the product gasohol. The economics of these treatments need to be investigated.6. Instead of extraction, contacting and cooling is an alternative method for producing gasohol. Stabilized wet gasohol can be made by simply mixing 85-93% ethanol with unleaded gasoline at an appropriate temperature.The homogeneous mixture is then cooled to allow equilibrium and phase separation. Again, the economics of this process need to be studied. 7 pm in average size. Such mass transfer parameters as volumetric liquid-side mass transfer coefficient kL°a, specific gas-liquid interfacial area a, and hence liquid-side mass transfer coefficient kL°w ere determined under various electrolyte concentrations, solid concentrations, and gas flow rates, and kL°a could be correlated by the gas flow rate. The volumetric gas-side mass transfer coefficient k^a was determined and correlated by the gas flow rate. The enhancement factors during absorption of dilute carbon dioxide into aqueous calcium hydroxide slurries were compared with the theoretical predictions based on the film theory incorporating a finite slurry concept.

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