Nilai Anda 56 NamaAZAS TEKNIK KIMIA I TOPIK : NERACA MASSA SINGLE UNIT TANPA REAKSI PROBLEM 1. SUB-SCORE 100 Hundred kilograms per hour of an ethanol/methanol stream is to be separated in a distillation column. The feed con and the distillate is made up of 90% methanol. Eighty percent of the methanol is to be recovered as distillate. Determ bottoms product. Solution : Basis : mass of feed = 100 kg/h %recovery of CH3OH = 80% FEED DISTILLATE BOTTOM Component mass fract. mass mass fract. mass mass fract. mass C2H5OH 0.4 40 0.1 5.333333 0.7428571 34.66667 CH3OH 0.6 60 0.9 48 0.2571429 12 Answer : Total 1 100 1 53.33333 1 46.66667 %methanol in bottom = PROBLEM 2. SUB-SCORE 60 Two hundred kilograms of wet leather is to be dried by heating. The wet leather enters the drier with 60% moisture removed. Determine the mass fraction of the moisture content of the dried leather Solution : Basis : mass of wet leather = 200 kg % water removal = 90% wet leather water removed dried leather Component mass fract. mass mass fract. mass mass fract. mass Leather 0.4 80 water 0.6 120 108 12 Answer : Total 1 200 1 1 PROBLEM 3. SUB-SCORE 100 A feed stream to a distillation column, flowing at a rate of 1200 kg/h, contains a gas mixture of ethanol, methanol, an methanol. The distillate consists of 90% of the methanol and 60% of the ethanol contained in the feed. All of the 400 ends up in the bottom of the column. Calculate bottom stream mass flow rate. Solution : mass C2H5OH 0.3 wt% HCl is mixed with pure water in a stirred vessel to prod What ratio of water to concentrated acid should be used? Solution : Basis : mass of aqueous HCl= (unit) CONCENTRATED PURE WATER PRODUCT Component mass fract. mass mass fract. mass mass fract. Eighty percent of the ethanol in the feed stream is to be recovered as distillate in the bottom stream.345679 224 C3H7OH 0.2 240 0. 57.617284 400 Answer : Total 1 1200 1 552 1 648 bottom stream PROBLEM 4. The feed stream contains 60 wt% ethan 80% ethanol and the balance is water. mass HCl H 2O Total ratio of water to .037037 24 C2H5OH 0. mass mass fract.3333333333 400 0 0 0. mass mass fract.6086957 336 0.6 H 2O 0.4 Answer : Total 1 mass fract of ethanol in PROBLEM 5.Basis : mass of feed = 1200 kg/h FEED DISTILLATE BOTTOM Component mass fract. mass CH3OH 0. mass mass fract. Solution : Basis : mass of feed = 100 kg/h % recovery of ethanol = 80% FEED DISTILLATE BOTTOM Component mass fract. SUB-SCORE 21 A 100 kg/h ethanol–water stream is to be separated in a distillation column. mass mass fract. that is.3913043 216 0. SUB-SCORE 0 A kg/h stream of aqueous hydrochloric acid.4666666667 560 0. 71% e drier with 60% moisture and 90% of the water is Answer : mass fraction of moisture content = re of ethanol. All of the 400 kg/h of propanol fed to the process . and propanol.ama NIM tion column. The feed contains 20% d in the feed. Determine the percent methanol in the Answer : %methanol in bottom = 25. methanol. The feed consists of 40% ethanol overed as distillate. Answer : bottom stream flow rate= 648 kg/h am contains 60 wt% ethanol and 40% water.5% acid. Determine the composition of ethanol Answer : mass fract of ethanol in bottom= r in a stirred vessel to produce a stream of 16. The distillate contains to be recovered as distillate. Answer : ratio of water to concentrated acid = .
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