申論題

Problem8 Fill-in-the-Blank (10 points)
A countercurrent extraction plant is used to extract acetone from its mixture with water by means of methyl isobutyl ketone (MIK) at a temperature of 25℃. The feed consists of 40 percent acetone and 60 percent water. Pure solvent equal in mass to the feed is used as the extracting liquid. In such an extraction process, you need (a) 5pt ideal stages to extract 99 percent of the acetone fed, and the extract composition is (b) 5pt... after removal of the solvent. (Hint. The following phase diagran can be used)