009Estimation of Refinery Stream Properties

8/13/2019 009Estimation of Refinery Stream Properties

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2. EstimationofRefineryStreamProperties2.1IntroductionInthischapter,wepresentvariouscorrelationsavailableforthepropertyestimationofrefinerycrude,

intermediate andproduct streams. Mostof these correlations are available inMaxwell (1950),API

TechnicalHandbook(1997)etc. Amongstseveralcorrelationsavailable,themostrelevantandeasyto

usecorrelationsaresummarizedsoastoestimaterefinerystreampropertieswithease.

Thedeterminationof various streamproperties ina refineryprocessneeds to firstobtain the crude

assay. Crudeassayconsistsofasummaryofvariousrefineryproperties. Forrefinerydesignpurposes,

themostcriticalcharts thatare tobeknown fromagivencrudeassayareTBPcurve, oAPIcurveand

Sulfurcontentcurve.Thesecurvesarealwaysprovidedalongwithavariationinthevol%composition.

Often, it isdifficulttoobtainthetrends inthecurvesforthe100%volumerangeofthecrude.Oftencrudeassayassociated to residuesectionof thecrude isnotpresented. Insummary,a typicalcrude

assayconsistsofthefollowinginformation:

a) TBPcurve (


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EstimationofRefineryStreamProperties

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Volume %

0 20 40 60 80 100

TemperatureoF

-200

0

200

400

600

800

1000

1200

1400

1600

Figure2.1:TBPCurveofSaudiheavycrudeoil.

Volume %

0 20 40 60 80 100

oAPI

0

20

40

60

80

100

Figure2.2:oAPICurveofSaudiheavycrudeoil.


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Volume %

0 20 40 60 80 100

Sulfurcontent(wt%)

0

1

2

3

4

5

6

Figure2.3:SulfurcontentassayforheavySaudicrudeoil.

2.2EstimationofaveragetemperaturesThe volume average boiling point (VABP) of crude and crude fractions is estimated using the

expressions:

(1)

(2)

Themean average boiling point (MEABP),molal average boiling point (MABP) and weight average

boilingpoint(WABP)isevaluatedusingthegraphicalcorrelationspresentedinMaxwell(1950). These

aresummarizedinTables2.12.3forbothcrudesandcrudefractions.Whereapplicable,extrapolation

of provided data trends is adopted to obtain the temperatures if graphical correlations are not

presentedbeyondaparticular range in thecalculations.Wenextpresentanexample to illustrate the

estimationoftheaveragetemperaturesforSaudiheavycrudeoil.


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STBPoF/vol%

DifferentialstobeaddedtoVABPforevaluatingMEABPforvariousvaluesofVABP

200oF 300oF 400oF 500oF 600+oF0.8 0.092

1

0.946

1.2 2.157 0.211

1.4 3.411 0.674

1.6 4.977 2.043

1.8 6.370 3.324 0.237

2 8.210 4.821 1.366

2.2 9.853 6.171 2.607 0.738 0.832

2.4 11.664 7.709 3.696 1.635 1.633

2.6 13.525 9.125 5.037 2.490 2.349

2.8 15.411 11.074 6.476 3.393 3.267

3 17.171 12.564 7.763 4.231 4.369

3.2 19.428 14.336 9.238 5.174 5.250

3.4 21.479 16.119 10.731 6.177 6.277

3.6 23.378 18.015 12.184 7.313 7.182

3.8 25.665 19.904 13.958 8.525 8.306

4 27.863 21.882 15.558 9.794 9.621

4.2 30.137 23.866 17.390 11.497 10.623

4.4 32.447 26.153 19.135 13.157 12.039

4.6 34.585 28.059 21.121 14.815 13.083

4.8 37.252 30.509 23.220 16.502 14.627

5 39.713 32.746 25.268 18.452 16.232

5.2 34.931 27.320 20.564 17.263

5.4 37.337 29.452 24.538 18.956

5.6 39.988 31.934 31.482 20.741

5.8 42.004 34.231 34.134 22.164

6 45.231 36.770 36.644 23.843

6.2 39.325 39.224 25.438

6.4 41.766 41.605 27.517

6.6 44.287 44.536 29.529

6.8 47.027 47.392 31.390

7 50.345 50.612 33.442

7.2 53.459 35.723

7.4 56.580 37.580

7.6 59.714 39.817

7.8 42.204

8 44.253

8.2 46.637

8.4 48.916

8.6 51.513

8.8 53.958

9 56.606

9.2 59.260

9.4 62.025

9.6 64.491

9.8 67.463

10 70.073

Table2.1:TabulatedMaxwellscorrelationdatafortheestimationofmeanaverageboilingpoint(AdaptedfromMaxwell(1950)).


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STBPoF/vol%

DifferentialstobeaddedtoVABPforevaluatingweight

averageboilingpoint

200oF 300

oF 400

oF 500

oF

1 0.385

1.2 0.871

1.4 1.562 0.4252

1.6 1.731 0.6859

1.8 2.385 1.1478

2 2.860 1.4331 0.428

2.2 3.372 1.9128 0.869

2.4 3.801 2.3559 1.364 0.084

2.6 4.603 2.7724 1.770 0.705

2.8 5.096 3.3327 2.241 1.149

3 5.288 3.9349 2.623 1.356

3.2 5.992 4.3339 3.063 1.598

3.4 6.471 4.8098 3.556 2.094

3.6 7.242 5.2685 3.979 2.690

3.8 7.874 5.9560 4.527 3.164

4 8.392 6.5961 5.281 3.5284.2 9.103 7.1566 5.850 3.977

4.4 9.822 7.7964 6.378 4.707

4.6 10.406 8.5729 7.051 5.431

4.8 11.149 9.3378 7.698 5.997

5 12.309 9.8381 8.530 6.699

5.2 10.5521 9.450 7.525

5.4 11.3710 10.120 8.340

5.6 12.3187 10.843 9.355

5.8 13.0148 11.766 10.155

6 13.7419 12.818 11.036

6.2 13.806 12.062

6.4 14.651 12.825

6.6 15.504 13.641

6.8 16.619 14.862

7 17.854 16.076

7.2 17.383

7.4 18.437

7.6 19.485

7.8 20.817

8 21.718

8.2 23.035

8.4 24.437

8.6 25.806

8.8 27.236

9 28.498

9.2 29.729

9.4 31.4819.6 32.713

9.8 34.373

10 35.656

Table2.2:TabulatedMaxwellscorrelationdatafortheestimationofweightaverageboilingpoint(AdaptedfromMaxwell(1950)).


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STBPoF/vol%

DifferentialstobeaddedtoVABPfor

200oF 300

oF 400

oF

1.2 0.198

1.4

1.528

1.6 4.137 0.808 0.808

1.8 6.243 2.103 2.103

2 7.736 3.865 3.865

2.2 9.942 5.853 5.853

2.4 12.190 7.855 7.855

2.6 14.412 10.056 10.056

2.8 16.720 12.286 12.286

3 19.183 14.513 14.513

3.2 22.225 16.907 16.907

3.4 24.354 19.439 19.439

3.6 27.572 22.195 22.195

3.8 30.467 25.215 25.215

4 33.302 27.810 27.810

4.2 36.718 30.893 30.893

4.4 40.485 33.998 33.998

4.6 43.955 37.582 37.582

4.8 47.289 40.966 40.966

5 51.589 44.487 44.487

5.2 55.380 48.548 48.548

5.4 59.634 52.525 52.525

5.6 63.603 56.417 56.417

5.8 68.993 60.733 60.733

6 73.650 65.524 65.524

6.2 70.237 70.237

6.4 75.367 75.367

6.6 80.412 80.412

6.8 86.654 86.654

7 91.941 91.941

7.2 98.218 98.218

7.4 104.912 104.912

Table2.3:TabulatedMaxwellscorrelationdatafortheestimationofmolalaverageboilingpoint(AdaptedfromMaxwell(1950)).


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Q2.1:UsingtheTBPpresentedinFigure2.1andgraphicalcorrelationdata(Table2.12.3),estimatetheaveragetemperaturesofSaudiheavycrudeoil.

Solution:a. Volume averageboilingpoint

Tv=t20+t50+t80/3=(338+703+1104)/3=7150F

b. Meanaverageboilingpoint(fromextrapolation)

Slope= t70t10/60 =965205/60=12.67

FromTable2.1

T(400,12.67)= 116.150F

T(500,12.67)= 102.480F

T(715,12.67)= 73.08950F(fromextrapolation)

Meanaverageboilingpoint= Tv+ T=71573.0895=641.910F

c. Weight averageboilingpoint(fromextrapolation)

Slope= t70t10/60 =965205/60=12.67

FromTable2.1

T(400,12.67)=43.5150F

T(500,12.67)=41.5150F


Weightaverageboilingpoint= Tv+ T=715+37.215=752.210F

d. Molal averageboilingpoint(fromextrapolation)

Slope= t70t10/60 =965205/60=12.67

FromTable2.2

T(400,12.67)= 212.960F

T(600,12.67)= 191.620F


Molalaverageboilingpoint= Tv+ T=715179.3495=535.650F

009Estimation of Refinery Stream Properties

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