Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Chemistry Expert

problem 1: Ethanol is frequently used as a fuel additive, but to function in most engines, the ethanol should be very pure and contain little water. It is difficult to distill ethanol and water above 90 mol% ethanol as at this concentration the vapor and the liquid phases of this mixture have similar composition. To get around this effect, benzene is frequently added to the mixture. The distillation column then separates the mixture into a very nearly pure ethanol stream, and a mixture of benzene and water. The benzene may be separated from the water, and then recycled to use again in the ethanol-water distillation.

The company wishes to distill a 0.870 mole fraction ethanol solution (the balance is water). To aid in the distillation process, a mixture of benzene and water is added to the distillation column. This benzene or water mixture is made by combining a fresh feed of 0.97 mol fraction benzene in water with a recovered benzene solution. The plant wishes to produce 73.0 moles/hr of a 0.999 mole fraction ethanol (0.001 mole fraction benzene) mixture from a distillation column. The other product from the distillation is a water and benzene mixture. This mixture is sent to the separator which produces a 10.70 mol/hr stream of pure water, and a 0.93 mol fraction benzene mixture in water; from this benzene mixture a small amount is purged and the remaining 90.00 mol/hr is recycled back to the fresh benzene stream to form the feed into the column.

a) Draw the process flow diagram. On the flow chart, label all the variables and unknowns.

b) What is the basis of calculation for the process?

c) Compute the total degrees of freedom over the entire process. Next, compute the degrees of freedom around each unit operation. Label all the calculations.

d) List all the algebraic equations for the material balances and the order for which you would solve for all of the unknowns. If the problem is underdetermined list which unknowns you can solve for. DO NO CALCULATIONS.

problem 2: Streptomycin is an antibiotic generally used to fight bacterial diseases in humans. Streptomycin is produced by the microbial strain Streptomyces griseus by fermentation on glucose and soybean meal. After fermentation, the biomass is separated from liquid and Streptomycin is recovered by adsorption on activated charcoal followed by extraction with an organic solvent in a continuous extraction process. For the given problem, ignore the other details of the process and consider just the overall extraction process: 200 L/h of an aqueous solution containing 10 g Streptomycin per L (SG 1.00) is contacted with 10 L/hr of an organic solvent (SG 0.600). Two streams leave the extraction procedure: an aqueous solution of 0.2 g Streptomycin per L and an organic solvent containing an unknown concentration of Streptomycin.

a) Draw the process flow diagram. On flow chart, label all the variables and unknowns.

b) What is the basis of calculation for the process?

c) Compute the degrees of freedom for the overall process. Label all the calculations.

d) List all the material balances and the order for which you would resolve for all of the unknowns. If the problem is underdetermined list which unknowns you can solve for. If the problem can be solved give the concentration of Streptomycin in the output stream in units [g/L].

problem 3: MTBE (methyl tert-butyl ether) is added to the gasoline (SG 0.72) to raise the oxygen content of the gasoline. MTBE (SG 0.74) is soluble in water to certain extent and becomes a contaminant when the gasoline gets into surface or underground water. The gasoline used by boats has an MTBE content of 10 vol%. The boats operate in a well-mixed flood control pond having dimensions 3 km long, 1 km wide, and 3 m deep on average. Assume that each of the 10 boats on the pond spills 0.5 L of gasoline throughout the 12 h of daylight. The flow of water (which contains no MTBE) into the pond is 10 m3/hr, however no water leaves the spillway as the water level is below the spillway of the pond. Also suppose that no water or MTBE leaves due to evaporation.

a) Draw the process flow diagram. On flow chart, label all the variables and unknowns.

b) What is the mass fraction of MTBE in the pond after the end of 12 hr of boating? Express your answer in parts per billion. Suppose no MTBE is initially in the pond.

Chemistry, Academics

  • Category:- Chemistry
  • Reference No.:- M91828

Have any Question? 


Related Questions in Chemistry

Imagine you are performing a calorimetry experiment using a

Imagine you are performing a calorimetry experiment using a constant-pressure calorimeter. First, you calibrate the calorimeter using the reaction of KOH with HCl (enthalpy = -56.2 kJ/mol). Then, you use the calorimeter ...

If it is considered that drinking 800 ml of water per day

If it is considered that drinking 800 mL of water per day containing an arsenic concentration equal to the US EPA maximum contaminant level (MCL), delivers the dose to an adult that corresponds to a 1 in 10,000 excess ri ...

If 628 g ca react with 923 g hcl according to the reaction

If 62.8 g Ca react with 92.3 g HCl according to the reaction below, how many grams of hydrogen gas will be produced, and how many grams of the excess reactant will be left over? Unbalanced equation: Ca + HCl → CaCl2+ H2 ...

Assume that coal is pure carbon with a density of 1280 kgm3

Assume that coal is pure carbon with a density of 1280 kg/m3 and that the particle is spherical with an initial diameter of 0.015 cm. Air exists several diameters away 1) Nco= ____Noxygen 2) The more fraction of oxygen a ...

Assuming 100 yield what are the masses of the products that

Assuming 100% yield, what are the masses of the products that are formed by reacting 2.3g of C2H6(g) with excess O2(g) in the reaction C2H6(g) + O2(g)--->CO(g) +H2O(g).

Consider a pipe with a length of 435 cm if the temperature

Consider a pipe with a length of 43.5 cm. If the temperature of the air is 19.5 oC and the pipe is closed in one end and open in the other, what is the frequency of the third harmonic for the pipe? Post your answer in he ...

If you eat a 48 g serving rice every fourth day and you

If you eat a 48 g serving rice every fourth day and you weigh 75 kg, what is your dose of inorganic arsenic (in µg per kg body weight per day) if the rice contains 386 µg kg -1 of total arsenic, 45% of which is inorganic ...

Discussion 1 in this discussion consider how fats are

Discussion 1: In this discussion, consider how fats are digested and utilized in the body. Address the following questions: What enzyme is necessary for fat digestion?  Where is this enzyme produced and where does fat di ...

Titanium reacts with hydrogen peroxide in 100 m sulfuric

Titanium reacts with hydrogen peroxide in 1.00 M sulfuric acid to form a colored complex. If a 2.00x10^-5 M solution absorbs 31.5% of the radiation at 415 nm, what would be: the absorbable, the transmittance, and the per ...

Subject chemistry amp physics please answer all questions

(Subject: Chemistry & Physics) Please answer all questions. Please be clear. Short answers are fine. 3-4 sentences. 1) If a feather and a lead ball are dropped from 1000m in AIR (vacuum) , will they hit the ground at the ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro