| 摘要 |
PURPOSE:To obtain a highly concentrated alcohol having low content of impurities with reduced energy, by adding a low concentrated aqueous solution of an alcohol containing impurities from the top of a multi-stage extraction device of counter flow contact type, feeding a solvent from the bottom of the device and blending both in a supercritical state of the solvent. CONSTITUTION:A mixture consisting of 10-20% alcohol, a small amount of a high-boiling impurities and the rest of water is fed from the top of a multi- stage extraction device of counter flow contact type, a solvent (CO2, 2-4C hydrocarbon, etc.) for the alcohol is fed from the bottom of the device, the interior of the device 3 is made in a supercritical state of the solvent and both are brought into contact with eath other. A light solution is taken out from the top part 6 of the device 3, fed through the reducing valve 7 to the separating column 8, separated into the highly concentrated alcohol 10 with low impurity content and a heavy impurity solution, the latter is added to a mixture of the raw material and fed again to the multi-stage extraction device 3 of counter flow contact type. |
