| 摘要 |
PURPOSE:To obtain a highly concentrated alcohol having low content of impurities with reduced energy, by adding a solvent for alcohol to a mixture of water, an alcohol and impurities and blending them in a supercritical state of the solvent. CONSTITUTION:A mixture comprising 10-20% alcohol, a small amount of high-boiling impurities and the rest of water is blended with a solvent (CO2 or 2-4C hydrocarbon) to dissolve only the alcohol, fed to the blender 4 and well blended in the supercritical (pseudo critical) state of the solvent and introduced to the first extracting and separating tank 5. They are separated into a heavy solution consisting of water, the impurities and part of the alcohol and a light solution consisting of the solvent, the alcohol and part of the impurities. The light solution is fed to the impurity separating tank 9, the pressure of the tank is reduced and the solution is separated into the concentrated and purified alcohol and a solution containing the impurities, water and a small of the alchool. The latter is mixed with the heavy solution extracted from the tank 5, they are blended with a solvent, fed to the second extracting and separating tank 17, separated similarly into a heavy solution and a light solution and the light solution is collected as the concentrated and purified alcohol. |
