Separation Process Principles on COCO/ChemSep

based on  Henley, Seader, Roper: Separation Process Principles, Third edition, Wiley (2011).



EXAMPLE 4.1 Phase Conditions of a Process Stream.

A 100-kmol/h feed of ------ what are the liquid and vapor compositions?

[Solution]  sppex_4_1.xls    sppex_4_1.fsd

EXAMPLE 4.2 Bubble-Point Temperature.

The nC4-rich bottom product------estimate the mixture temperature


[Solution]     sppex_4_2.fsd

EXAMPLE 4.3 Bubble-Point Pressure.

---Calculate that pressure using the following composition, activity coefficients, and vapor pressures:


[Solution]    sppex_4_3.fsd

EXAMPLE 4.4 Distillation column operating pressure.

Propylene is separated from 1-butane by distillation into a vapor distillate containing 90mol% propylene. Calculate the column pressure if the partial condenser exit temperature is 100F----


[Solution]    sppex_4_4.fsd

EXAMPLE 4.5 Adiabatic Flash of the Feed to a Distillation Column.

-- Calculate the percent molar vaporization of the feed and compositions of the vapor and liquid if the pressure is decreased adiabatically from 485 to 165 psia ---

[Solution]     sppex_4_5.fsd

EXAMPLE 4.6 Single-Stage Extraction of Acetic Acid.

Methyl isobutyl ketone (C) is used as a solvent to remove acetic acid (B) from -- water (A)---estimate the kg/h of solvent for a single equilibrium stage.

[Solution]     sppex_4_6.sep

EXAMPLE 4.7 Single-Equilibrium Stage Extraction Using Diagrams.

Methyl isobutyl ketone (C) is used as a solvent to remove acetic acid (B) from -- water (A)---estimate the kg/h of solvent for a single equilibrium stage.


[Solution]   sppex_4_7.sep (ASOG)

EXAMPLE 4.8 Liquid-Liquid Equilibrium for a Four-Component Mixture.

Estimate the amounts of the phases in kg/h and the equilibrium phase compositions ---


[Solution]  sppex_4_8.sep  (Modified UNIFAC) 

EXAMPLE 4.13 Absorption of CO2 with Water.

The CO2 is vented at the top of the mountain --- calculate the amount of water --

[Solution]  sppex_4_13.fsd (EOS/Predictive SRK)

EXAMPLE 4.14 Equilibrium Diagram for Air-NH3-H2O at 20C and 1 atm.

-- If 10 mol of gas of Y=0.3 are contacted with 10 mol of solution of X=0.1, what are the compositions of the resulting phases? ----

[Solution]  sppex_4_14.fsd   (K-value: Polynomial K from The ChemSep Book p. 43)

EXAMPLE 5.2 Extraction with Different Cascade Arrangements.

-- A feed of a 25% solution of p-dioxane in water is to be separated with benzene. ---

[Solution] sppex_5_2.sep    (Modified UNIFAQ)

EXAMPLE 5.3 Absorption of Hydrocarbons by Oil.

-- the heavier components in a superheated hydrocarbon gas are to be removed by absorption with a high-molecular -weight oil.

[Solution]   sppex_5_3.fsd     (TEA/Pen Robinson)

Chapter 6, Industrial Example ( Acetone vapor absorption by water)

--30-trey absorber is to recover the acetone by contacting the gas with a suitable absorbent, water. --

[Solution]  sppex_6_0.fsd     (DECHEMA/Modified UNIFAC/Extended Antoine)

EXAMPLE 6.1 Recovery of Alcohol

A CO2-rich vapor with a small amount of ethyl alcohol is evolved. The alcohol is recovered by absorption with water in a sieve-tray tower. --

[Solution]  sppex_6_1.fsd      (EOS/Predictive SRK)

EXAMPLE 6.2 Stripping of VOCs from Wastewater

-- the stripping by air of volatile organic compounds (VOCs) from wastewater. ---

[Solution] sppex_6_2.fsd       (EOS/Predictive SRK)

EXAMPLE 6.3 Absorber Efficiency.

Performance data, given below for a trayed absorber --, were reported. -- Based on the these data, back-calculate the overall stage efficiency--

[Solution]   sppex_6_3.fsd       (TEA/Pen Robinson)

EXAMPLE 6.10 Absorption of SO2 in a Packed Column.

Air containing 1.6% by volume SO2 is scrubbed with pure water in a packed column -----

[Solution] sppex_6_10.fsd     (EOS/Predictive SRK)

EXAMPLE 6.11 Absorption of Ethylene Oxide.

A gaseous reactor effluent of 2 mol% ethylene oxide in a inert gas is scrubbed with water at 30°C and 20 atm. -----

[Solution]   sppex_6_11.fsd    (EOS/Predictive SRK)

EXAMPLE 6.13 Flooding, Pressure Drop, and Diameter.

Forty lbmol/h of air containing 5 mol% NH3 enters a packed column at 20°C and 1 atm, where 90% of the ammonia is scrubbed by a countercurrent flow of 3000 lb/h of water. -----

[Solution]  sppex_6_13.fsd    (EOS/Predictive SRK)

EXAMPLE 6.16 NTU for a Packed Column with Concentrated Solute.

To remove 95% of the ammonia from an air stream containing 40% ammonia by volume, 488 lbmol/h of absorbent per 100 lbmol/h of entering gas are used -----

[Solution]  sppex_6_16.fsd     (EOS/Predictive SRK)

Chapter 7, Industrial Example: Distillation of a binary mixture of benzene and toluene.

[Solution]  sppex_7_0.fsd     (DECHEMA/Van Laar/Extended Antoine)

EXAMPLE 7.1 Distillation of a Mixture of Benzene and Toluene.

Four hundred and forty lbmol/h (204 kmol/h) of a mixture of 60 mol% benzene (LK) and 40 mol% toluene (HK) is to be separated into a liquid distillate and a liquid bottoms product of 95 mol% and 5 mol% benzene, respectively. ------

[Solution] sppex_7_1.fsd   (DECHEMA/Van Laar/Extended Antoine)

EXAMPLE 7.3 McCabe-Thiele Methd for a Column with Only a Feed Plate.

Solve Example 7.2: (a) graphically, assuming that the feed is introduced on plate 1----

[Solution]  sppex_7_3.fsd   (DECHEMA/Van Laar/Extended Antoine)

EXAMPLE 7.4 McCabe-Thiele Method for a Very Sharp Separation.

Repeat part (c) of Example 7.1 for benzene distillate and bottoms purities of 99.9 and 0.1 mol%, respectively. ------

[Solution]  sppex_7_4.fsd   (DECHEMA/Van Laar/Extended Antoine)

Chapter 8, Industrial Example.

A feed of 30,260 lb/h of 22 wt%  acetic acid in water is sent to a single-section extraction column operating at ambient conditions, where it is contacted with 71,100 lb/h of ethyl-acetate solvent. ------

[Solution] sppex_8_0.sep     (Modified UNIFAQ)

EXAMPLE 8.1 Equilibrium Stages for Extraction.

Acetone is to be extracted from a 30 wt% acetone (A) and 70 wt% ethyl acetate (C) feed at 30°C, using pure water (S) as the solvent ------

[Solution]  sppex_8_1.sep    (Modified UNIFAQ)

EXERCISE 8.11.  Extraction of acetone by trichloroethane.

One thousand kg/h of a 45 wt% acetone-in-water solution is to be extracted at 25°C in a continuous, countercurrent system with pure 1,1,2-trichloroethane to obtain a raffinate containing 10 wt% acetone.----

[Solution]   sppexc_8_11.sep  (Modified UNIFAQ)

EXERCISE 8.13. Extraction of isopropanol with water.

A distillate of 45 wt%  isopropyl alcohol, 50 wt% diisopropylether, and 5 wt % water is obtained from an isopropyl alcohol finishing unit. The ether is to be recovered by liquid-liquid extraction with water, the solvent, entering the top and the feed entering the bottom, ------

[Solution]    sppexc_8_13.sep  (Modified UNIFAQ)

EXAMPLE 9.1 - 9.7. Debutanizer.

The multicomponent hydrocarbon feed in Figure 9.2 is typical of the feed to the recovery section of an alkylation plant in a petroleum refinary. ---

[Solution]   sppex_9_1.fsd   (Raoul's law/ Antoine)

EXAMPLE 9.8 Stripping with Nitrogen.

Sulfur dioxide and butadienes (B3 and B2) are to be stripped with nitrogen from the liquid stream given in Figure 9.15  ---

[Solution]   sppex_9_8.fsd  (DECHEMA/Modified UNIFAC/Antoine)

EXERCISE 9.1 Type of condenser and operating pressure.

A mixture of propionic and n-butyric acids is to be separated by distillation into a distillate containing 95 mol % propionic acid and a bottoms of 98 mol% n-butyric acid. --

[Solution]  sppex_9_1.fsd    (DECHEMA/Modified UNIFAC/Antoine)

EXERCISE 9.2 Type of condenser and operating pressure.

Two distillation columns are used to produce the produce the products indicated in Figure 9.19.  Establish the type of condenser and an operating pressure --

[Solution]    sppexc_9_2.fsd    (TEA/ Peng Robinson)

EXERCISE 9.4 Stages for a deethanizer.

For the deethnizer in Figure 9.21, use the Fenske equation to determine Nmin ---

[Solution]  sppexc_9_4.fsd      (TEA/ Peng Robinson)

EXERCISE 9.5 Fenske equation for a column with a vapor sidestream.

For the complex distillation in Figure 9.22, use the Fenske equation to determine Nmin ---

[Solution]  sppexc_9_5.fsd    (TEA/ Peng Robinson)

EXERCISE 9.6 Comparison of Fenske equation with McCabe-Thiele method.

A 25 mol% mixture of acetone (A) in water (W) is to be separated by distillation at 130 kPa into a distillate containing 95 mol% acetone and a bottoms of 2 mol% acetone ---Calculate Mmin by the Fenske equation. --

[Solution]  sppexc_9_6.fsd    (Wilson)

EXERCISE 9.7 Distribution of nonkeys and minimum stages.

For the distillation in Figure 9.23, calculate Nmin and the distribution of the nonkey components  by the Fenske equation --

[Solution]  sppexc_9_7.fsd  (TEA/ Peng Robinson)

EXERCISE 9.8 Type of condenser, operating pressure, nonkey distribution, and Nmin.

For the distillation in Figure 9.24, calculate Nmin and the distribution of the nonkey components. --

[Solution]   sppexc_9_8.fsd  (EOS/Predictive SRK)

EXERCISE 9.9 Type of condenser, operating pressure, nonkey distribution, and Nmin.

For the distillation in Figure 9.24, calculate Nmin and the distribution of the nonkey components. --

[Solution]   sppexc_9_9.fsd   (TEA/ Peng Robinson)

EXERCISE 9.16 FUG method for HC distillation.

The hydrocarbon feed to a distillation column is a bubble point liquid at 300 psia with mole fractions: C2=0.08, C3=0.15, nC4=0.2, nC5=0.27, nC6=0.2,,, and nC7=0.10.

[Solution]     (TEA/ Peng Robinson)

EXERCISE 9.17 FUG method for HC distillation.

The following feed mixture is to be separated by ordinary distillation at 120 psia to obtain 92.5 mol% of the nC4 in the liquid distillate and 82.0 mol% of the iC5 in the bottoms.

[Solution]   sppexc_9_17.fsd  (TEA/ Peng Robinson)

EXERCISE 9.18 FUG method for a chlorination effluent.

Consider the separation by distillation of a chlorination effluent to recover C2H5Cl. ----

[Solution]   sppexc_9_18.fsd   (TEA/ Peng Robinson)

EXERCISE 9.22 Effect of N and operating pressure on absorption.

Determine, by the Kremser method, the achievable separation for the absorber in Figure 9.26 -------

[Solution]   sppexc_9_22.fsd   (TEA/ Peng Robinson)

EXERCISE 9.23 Effect of N on absorption of a paraffin mixture.

One thousanf kmol/h of rich gas at 70°F with 25% C1, 15% C2, 25% C3, 20% nC4, and 15% nC5 by mols is to be absorbed by 500 kmol/h of nC10 at 90°F in an absorber at 4 atm.  -------

[Solution]   sppexc_9_23.fsd    (TEA/ Peng Robinson)

EXERCISE 9.26 Extraction of a HC mixture by DEG.

One hundred kmiol/h of an equimolar mixture of benzene (B), toluene (T), n-hexane (C6), n-heptane (C7) is to be extracted at 150 by 300 kmol/h of diethylene glycol (DEG) on a countercurrent, liquid-liquid extractor having five equilibrium stages. -----

[Solution]   sppexc_9_26.sep   (Modified UNIFAQ)

EXAMPLE 10.1 First Iteration of the BP Method.

For the distillation column shown in Figure 10.7,  -----

[Solution]  sppex_10_1.fsd   (TEA/ Peng Robinson)

EXAMPLE 10.2  BP Method.

Calculate stage temperatures, interstage vapor and liquid flow rates and compositions, reboiler duty, and condenser duty by the BP method for the column specifications given in Figure 10.8.

[Solution]   sppex_10_2.fsd (TEA/ Peng Robinson)

EXAMPLE 10.4  SR Method.

Calculate stage temperatures and interstage vapor and liquid flow rates and compositions by SR method for the absorber specifications in Figure 5.11.

[Solution] sppex_10_4.fsd (TEA/ Peng Robinson)

EXAMPLE 10.5  ISR Method.

The separation of benzene (B) from n-heptane  ---  liquid-liquid extraction with a mixture of dimethylformamide (DMF) and water can be used. ---

[Solution] sppex_10_5.sep     (Modified UNIFAQ)

EXERCISE 10.37. Absorption of a hydrocarbon gas.

Calculate product rates and compositions, stage temperatures, and interstage vapor and liquid flow rates and compositions for an absorber having four equilibrium stages with the specifications in Figure 10.37. Assume the oil is nC10.

[Solution]   sppexc_10_37.fsd   (TEA/ Peng Robinson)

EXAMPLE 11.5 Pressure-Swing Distillation.

Ninety mol/s of a mixture of 2/3 by mols ethanol and 1/3 benzene -- is to be separated--- Apply the sequence shown in Figure 11.23b with the first column operating ar 30 kPa ---The distillate is sent to the second column, which as a top tray pressure of 106 kPa---

[Solution]    sppex_11_5.fsd    (DECHEMA/Wilson/Extended Antoine)

EXAMPLE 11.0 Azeotropic distillation for Ethanol/Water separation with benzene.

Ethanol-water-benzene heterogeneous azeotrope distillation  with two columns and a decanter.

[Solution] sppex_11_0.fsd     (Prausnitz/ UNIQUAC Q')

EXAMPLE 12.4 Absorber Design.

Use REATEFRAC to predict column profiles for a 3.5-fr-diameter, 20-bubble-cap tray absorber operating at the conditions in Table 12.4.

[Solution]  sppex_12_4.fsd   (TEA/ Peng Robinson)

EXAMPLE 17.18 Triple-Effect-Evaporator System.

A feed of 44,090 lb/h of an aqueous solution containing 8 wt% colloids is to be concentrated to 45 wt% colloids in a triple-effect-evaporator system using forward feed.---

[Solution]  sppex_17_18.fsd   (TEA/ Peng Robinson)