| 摘要 |
PURPOSE:The product from the final distillation column is taken out in the form of form of vapor and dehydrated in the adsorption column and simultaneously all or almost of the reflux at the final column is supplied with the fractions of the columns other than the final one to permit economic and easy production of anhydrous ethanol through the multiple effect process. CONSTITUTION:Distillation columns 1-3 in the multiple effect system are used and the product is taken out of the final column 3 in the form of vapor 3V, introduced into the adsorption column 5 where the product is dehydrated to give anhydrous ethanol. At the same time, almost or all of the reflux at the final distillation column 3 is supplied with the fractions of the columns 1, 2 other than the column 3. The reflux ratios in individual columns are set substantially to a smae level and the pressures in individual columns are set so that the vacuum becomes higher in order from the first to the final. The feed F such as fermentation mash is fed in parallel to individual columns. This process needs very reduced thermal energy, facilitates regeneration operations economically, saves facility costs and permits easy operation. |
