Ask Question, Ask an Expert


Ask Chemical Engineering Expert

A mixture of methanol and water is to be separated in a new separation unit and you are needed to give a report detailing the design and costing of a distillation column with specifications illustrated below. The operating pressure is to be 1 atm and the feed temperature is 30° C.

Part A: Finding out the Thermodynamic data

1) Compare:

a) Ideal VLE data obtained by using Antoine's equation with VLE data obtained by using ChemCAD.

b) Ideal mixture.

c) Non-ideal mixture.

d) Data available in reference literature, by using Excel to generate a single plot displaying all your results. The plot must be in placed in the main part of your report. All numerical values are to be tabulated clearly (referred to from the main report) in an appendix in one table, that is, x-values in the first column and then one column of y-values from each computation method. (Separate hand-computations, and tables for each method, are not needed and must not be comprised.) Quote your literature sources clearly by using proper referencing format.

2) In brief describe the findings with particular emphasis on the appropriate of the thermodynamic model used in ChemCAD in predicting the thermodynamic data.

3) Make a clear recommendation of which method must be used and why.

Part B: Preliminary design

1) For the given specifications, find out the distillate and bottom flow rates, and also the light and heavy key splits into the distillate, for the column given the specifications above. (Make sure your mass balances over the column add up.)

2) Determine an average relative volatility from the experimental VLE data obtained in Part A. (Make sure you don’t emphasis some parts of the range more than others, that is, by comprising relatively more points between 0 and 0.1 than in the rest of range.)

3) Use the Fenske-Underwood-Gilliland (FUG) method supposing the constant average relative volatility to find out the number of theoretical stages N needed and also the feed point location NF (Kirkbride's method) to separate the mixture in a tray column supposing a total condenser and a kettle reboiler, using R/Rmin = 1.3. Quote the literature sources for your equations clearly.

4) By using the short-cut column model (SHOR) in ChemCAD, find out the number of theoretical phases N for the conditions given above supposing a) ideal mixture and b) non-ideal mixture.

5) Compare the estimates (ideal versus non-ideal mixture and hand calculations versus by using ChemCAD) and describe the effect on the design (over/under design and so on).

Part C: Detailed column design

1) By using the results from the short-cut computations as a starting point, find out the required number of phases in the column by using the rigorous SCDS ChemCAD model, a kettle reboiler and a sub-cooled condenser (20° C sub-cooling). Your design must have a reasonable (you define and describe) trade-off between first:

i) Column height N versus heat input QR with a fixed relative NF and then

ii) Feed location NF versus heat input QR for the N just found (optimizing based on QR indirectly considers reflux ratio R so don’t consider this separately). (When changing N, make sure you keep NF in its relative position, ex: a third from the top.) Describe the reasoning behind your choices.

2) For your final design, report the pressure, temperature, total mass and total molar flow rates and mole fractions of the product streams (in a Stream Box) and submit your PFD in the main report. Additionally, too report the number of phases, the reflux ratio, the feed location, the required heating and cooling duties (kW) in the report and comment on your findings (ex: accuracy, chosen design following column optimization, simple (that is, SHOR) model versus rigorous (that is, SCDS) model however on the same basis and so on).

Part D: Column sizing and costing

1) Find out the size (total height and diameter) and then the total purchased capital cost of the column section by using the data provided below for a) sieve trays and b) random packing by using ChemCAD. (Comprise a short ChemCAD report in appendix for each of the two final designs.)

2) Compute by hand the total column heights based on either the tray spacing and tray efficiency or the HETP. Tabulate the height with column diameter and purchased capital cost (in £) for each column alternative for simple comparison.

3) Present the relevant (you decide) technical and cost data (in £) for each alternative (although not in the form of ChemCAD printouts) and compare and describe these.

4) Make a clear proposal for which column type must be selected and why.

1445_column sizing information.jpg

Chemical Engineering, Engineering

  • Category:- Chemical Engineering
  • Reference No.:- M96636

Have any Question? 

Related Questions in Chemical Engineering

100 moles of a fuel containing methane and butane is burned

100 moles of a fuel containing methane and butane is burned with 25% excess air in a furnace producing stack gas at 300 degrees C and 105 kPa. Determine the amount of 100 psi saturated steam that can be produced from wat ...

A shell-and-tube heat exchanger with one shell pass and two

A shell-and-tube heat exchanger with one shell pass and two tube passes employs condensing steam at 1 atm on the shell side to heat 10 kg/s of engine oil from 50 to 60°C in the tubes. The steam enters as saturated vapor ...

A horizontal 25-mm diameter cylinder is maintained at a

A horizontal, 25-mm diameter cylinder is maintained at a uniform surface temperature of 35°C. A fluid with a velocity of 0.05 m/s and temperature of 20°C is in cross flow over the cylinder. Determine whether heat transfe ...

Show that the bilinear transformation of a pd controller

Show that the bilinear transformation of a PD controller with a high-frequency pole that makes the controller transfer function proper does not yield a pole at z = -1.

Two stirred tanks of volume v and 2v are available for

Two stirred tanks of volume "V" and "2V" are available for carrying out a first order irreversible reaction at constant density and temperature. If the flow rate of feed stream is "Q" which of the following arrangement w ...

Amounts of hardness in mg per l are asmgso4120 cano32164

amounts of hardness (in mg per l) are asmgso4=120 ca(no3)2=164 cacl2=222 mg(hso4)2=73 lime and soda are of 74% and 73% purity respectively. find the amount of lime & soda req. to soften the water

A well is producing from a saturated oilreservoir with an

A well is producing from a saturated oilreservoir with an average reservoir pressureof 3000 psig. Stabilized flow test dataindicates that the well is capable of producing400 STB/day at a bottom-holeflowing pressure of 25 ...

A potential flow source having an intensity of 10m2s placed

A potential flow source having an intensity of 10m2/s, placed in the point of Cartesian coordinates (1;0), and a sink having identical intensity, placed in the point (-1;0), are combined with a uniform flow at 25 m/s, in ...

The total capital investiment for a chemical plantis 1

The total capital investiment for a chemical plantis $1 million, and the working capital is $100,000. if the plant can produce an average of 8000kg of fixed product per dayduring 365-day per year, what selling price in d ...

1 what is the difference between closed and isolated

1) What is the difference between closed and isolated systems? 2) Is it true that thermodynamic equilibrium is reached very rapidly (a few seconds or less) in any system? Justify your answer or provide examples that supp ...

  • 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