a b. C. 22. One cubic meter of ethanol and 1 m of water are mixed together. Determine, (a) The composition of the resulting mixture in mass fractions. (b) The composition in mole fractions. (c) The volume of the resulting mixture (d) The composition as volume %. AT Table containing ethanol-water mixture densities may be found on the final page 23. A mixture containing 20 mole% butane (C.H.), 35 mole% pentane (CH2) and the balance consists of hexane (CH) is separated using fractional distillation into a distillate with a composition of 95 mole % butane, 4 mole % pentane, and a bottoms product. The distillate must contain 90% of the butane fed to the distillation column. Draw a PFD for this process, labelling all known and unknown stream flows and mole fractions. Pick and appropriate basis for this process. Determine the flows of the tops and bottoms streams and the composition of the bottoms product. d. Express the composition of the feed in mass fractions 24. A liquid mixture containing 25.0 wt% n-octane (a = 703 kg/m) and the balance n-decane e = 730 kg/m) flows into a tank mounted on a balance. The mass in kg indicated by the scale is plotted against time. The data fall on a straight line that passes through the points (t = 3 min, m=225 kg) and (t = 10 min, m=510 kg), (a) Estimate the volumetric flow rate of the liquid mixture. (6) What does the empty tank weigh? 25. Two liquid streams are flowing at constant rates into a blender. One is benzene, which flows at a measured rate of 20.0 L/min, and the other is toluene. The blended mixture enters a storage tank (inner diameter = 5.5 m) equipped with a sight gauge. During an interval in which no liquid leaves the storage tank, the liquid level in the tank is observed to increase by 0.15 meters over a one-hour period. Calculate the flow rate of toluene into the blender (L/min) and the composition of the tank contents (wt% benzene). 26. A copper sphere (p = 8930 kg/m) with a mass of 5kg is melted down and the resulting liquid is forced through a nozzle to produce very fine spherical droplets which are cooled to form metal pellets, if 1000 pellets are produced from the aforementioned metal sphere determine the diameter of a typical pellet and calculate the surface area of the 1000 pellets relative to that of the original sphere. Calculate the surface area per unit volume of copper pellets, also known as the specific surface area, and compare this to the specific surface area of the original metal sphere. Density of solution (10 kg/m) Volume% Ethanol Densities of Ethanol-Water Solutions at 20C Density of Weight % Volume% solution Weight % Ethanol Ethanol (10 kg/m) Ethanol 0 0 0.91322 51 1 13 0.91097 52 2 2.5 0.90872 53 3 38 0.90645 4 5 0.90418 55 5 62 0.90191 56 6 75 0.89962 57 7 8.7 0.89733 58 8 10 0.89502 59 9 112 0.89271 60 10 124 0.8904 61 11 13.6 0.88807 62 12 14.8 0.88574 63 13 16.1 0.88339 64 14 17.3 0.88104 65 15 185 0.87869 66 16 19.7 0.87632 67 17 20.9 0.87396 68 18 221 0.87158 69 19 23.3 0.8692 70 20 24,5 0.8668 71 21 257 0.8644 72 22 28.9 0.862 73 23 28.1 0.85958 74 24 29.2 0.85716 75 25 304 0.85473 76 26 31.5 0.1523 77 27 32.7 0.84985 78 28 339 0.8474 79 29 351 0.84494 80 30 36.2 0.84245 81 31 374 0.83997 82 32 38.5 0.83747 33 39.6 0.83496 84 34 40.7 0.83242 85 35 41.9 0.82987 86 36 0.82729 87 37 441 0.82469 88 38 452 0.82207 89 39 463 081942 90 40 47.4 081674 91 41 4843 0.81401 92 42 49.51 081127 33 43 505 080848 94 44 51.6 080567 95 45 526 08028 96 46 537 0.79988 97 47 547 0.79688 98 48 958 0.79383 99 49 36,8 0.790974 100 50 578 0.99813 0.99629 0.99451 099279 0.99113 098955 098802 0.98653 0.98505 098361 098221 9.98084 0.97948 0.979448 9.97687 0.97687 0.97431 0.97301 0.97169 0.97036 096901 0.96763 0.96624 0.95483 0.96339 0.9619 0.00037 09588 0.95717 0.95551 0.95381 0.95207 0.95028 0.94347 0.94662 0.94432 0.94281 0.94086 0.93886 093548 0.93479 0.93272 0.93062 092849 092636 0.92421 092204 091986 0.91766 0.91546 598 80.8 618 628 638 548 658 668 677 68.6 699 705 715 724 73.3 742 75.1 76 76.9 778 786 79.5 B04 812 82.1 838 84.6 85.4 862 871 879 88.7 895 90.2 91 91.8 925 932 94 947 954 96.1 967 974 98.1 987 993 100
