column to remove 99% of the NH3. What is the minimum air rate, in kilograms of air per kilogram of water, if the column operates at 20C? How many transfer units are required at twice the minimum air rate 第9周 1.现有溶剂10克和溶质1克组成的溶液,用萃取剂进行萃取因溶液较稀,分配系数为常数, 等于4(组成用质量比表示)假定溶剂和萃取剂不互溶.现拟用10克萃取剂进行萃取.试 设计出你认为最佳的萃取方法 第10周 1.100kg/h混和液,含溶质A0.40质量分数,下同)稀释剂B060.用100kgh萃取剂S进行 萃取.求在下述不同操作条件下的萃余相浓度及萃取率,并进行比较 (1)采用两级错流操作,每级所用的萃取剂为50kgh (2)采用两级逆流操作,萃取剂流量为100kgh 相平衡关系如下 萃余相 萃取相 (质量分数) (质量分数) 0.98 0.02 0.05 0.92 0.03 0.14 0.05 0.1 0.86 0.04 0.22 0.045 0.735 0.15 0.80 0.295 045 0.66 0.738 0.355 0.585 0.25 0.675 0.075 0.515 0.30 0.61 0.09 0.445 0.103 0.452 0.35 0.535 0.115 0.48 0.39 0.175 0.45 0.185 0.30 0.495 0.255 第11周 1. In a continuous countercurrent train of mixer-settler, 100 kg/h of a 40: 60 acetone-water solution is to be reduced to 10 percent acetone by extraction with pure 1, 1, 2-trichloroethane at 25C.(a) Find the minimum solvent rate; (b) At 1. 8 times the minimum(solvent rate)(feed rate), find the number of stages required. (c For conditions of part( b) find the mass flow rates of all streams. Data are given belo Limiting solubility curve C2H3C13. wt% Water. wt% Acetone wt%o 94.73 0.26 501 67.52 31.04column to remove 99% of the NH3. What is the minimum air rate, in kilograms of air per kilogram of water, if the column operates at 20ºC? How many transfer units are required at twice the minimum air rate? 第 9 周 1. 现有溶剂 10 克和溶质 1 克组成的溶液, 用萃取剂进行萃取.因溶液较稀, 分配系数为常数, 等于4(组成用质量比表示). 假定溶剂和萃取剂不互溶. 现拟用10克萃取剂进行萃取. 试 设计出你认为最佳的萃取方法. 第 10 周 1. 100kg/h 混和液, 含溶质 A0.40(质量分数, 下同),稀释剂 B0.60. 用 100kg/h 萃取剂 S 进行 萃取. 求在下述不同操作条件下的萃余相浓度及萃取率, 并进行比较. (1) 采用两级错流操作,每级所用的萃取剂为 50kg/h. (2) 采用两级逆流操作,萃取剂流量为 100kg/h. 相平衡关系如下: 萃余相 (质量分数) 萃取相 (质量分数) A B S A B S 0 0.98 0.02 0 0.1 0.9 0.05 0.92 0.03 0.14 0.05 0.81 0.1 0.86 0.04 0.22 0.045 0.735 0.15 0.80 0.05 0.295 0.045 0.66 0.20 0.738 0.062 0.355 0.06 0.585 0.25 0.675 0.075 0.405 0.08 0.515 0.30 0.61 0.09 0.445 0.103 0.452 0.35 0.535 0.115 0.48 0.13 0.39 0.40 0.45 0.15 0.495 0.175 0.33 0.45 0.365 0.185 0.50 0.22 0.28 0.48 0.30 0.22 0.495 0.25 0.255 第 11 周 1. In a continuous countercurrent train of mixer-settler, 100 kg/h of a 40:60 acetone-water solution is to be reduced to 10 percent acetone by extraction with pure 1,1,2-trichloroethane at 25C. (a) Find the minimum solvent rate; (b) At 1.8 times the minimum (solvent rate)/(feed rate), find the number of stages required. （c ）For conditions of part (b) find the mass flow rates of all streams. Data are given below. Limiting solubility curve C2H3Cl3, wt% Water , wt% Acetone , wt% 94.73 0.26 5.01 79.58 0.76 19.66 67.52 1.44 31.04