A fresh feed of butanol (B, C4H9OH), oxygen (O2), and nitrogen (N2) is mixed with a recycle stream and fed to a reactor overseen by Romana and Boswell. The flow rate of the fresh feed is 507 mol/hr with mole fractions of 0.057 for butanol, 0.539 for oxygen, and the balance nitrogen. The reactor effluent contains butanol, oxygen, nitrogen, CO2, NO2, and water (W, H2O), which is fed to a separator. A gas stream containing oxygen, nitrogen, CO2, NO2, and some of the water exits the separator, and a butanol/water stream also exits the separator. Ninety-five times more water exits the separator in the gas stream than exits the overall system in the purge stream. The overall conversion of butanol is 78%, and the single pass conversion of butanol is 55%. The component flow rates of oxygen and nitrogen leaving the separator are 38.4 mol/hr and 155 mol/hr, respectively.   In the last level, the overall system was solved. Component molar flow rates were found in units of mol/hr as: n˙4,CO2 = 90.2, n˙4,NO2 = 99.6, n˙4,W = 111.5, n˙6,B = 6.36, and n˙6,W = 1.174.   Now, find the component molar flow rate (mol/hr) of the feed to the reactor n2,B= n2,O2= n2,N2= n2,W

Ammonia is one of the chemical constituents of industrial waste that must be removed in a treatment plant before the waste can safely be discharged into a river or estuary. Ammonia is normally present in wastewater as aqueous ammonium hydroxide NH‡ 4 OH†. A two-part process is frequently carried out to accomplish the removal. Lime (CaO) is first added to the wastewater, leading to the reaction CaO ‡ H2O! Ca2‡ ‡ 2 OH† The hydroxide ions produced in this reaction drive the following reaction to the right, resulting in the conversion of ammonium ions to dissolved ammonia: NH‡ 4 ‡ OH ƒNH3 g† ‡ H2O l† Air is then contacted with the wastewater, stripping out the ammonia. (a) One million gallons per day of alkaline wastewater containing 0.03 mole NH3/mole ammoniafree H2O is fed to a stripping tower that operates at 68°F. Air at 68°F and 21.3 psia contacts the wastewater countercurrently as it passes through the tower. The feed ratio is 300 ft3 air/gal wastewater, and 93% of the…

A mixture of barium chloride and sulfuric acid yield the precipitate barium sulfate and hydrochloric acid according to the double replacement reaction: H,SO, (aq) + BaCl, (aq) → BaSO, (s) + 2 HCI (aq) 4 4 A large quantity of barium chloride is used to ensure that the sulfuric acid is the limiting reactant. If 41.7 grams of barium sulfate are produced, what mass of H,SO, must be dissolved in the initial aqueous solution? [Number in standard notation; round your answer to one decimal place] The following molar masses may or may not be needed, but are provided to save you time: • barium sulfate = 233 g/mnol sulfuric acid = 98.0 g/mol

Bromine (Br2) is produced by reacting HBr with O2, with water as a byproduct. The O2 is part of an air (21 mol % O2, 79 mol % N2) feed stream that is flowing sufficiently fast to provide 25% excess oxygen (“excess” has a precise meaning in process analysis: in this case there is 25% more oxygen than the amount needed to completely react with the limiting reactant). The fractional conversion of HBr is 78%. a) Show the degree of freedom analysis. Be as specific as possible about labeling the unknowns and completely write out all of the independent equations. b) Calculate the composition (mole fractions) of the product stream.