Download Chapter 4 - Separator Design PDF

TitleChapter 4 - Separator Design
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Total Pages39
Document Text Contents
Page 2

4-2


4.2 Process Description



The purpose of the calculations in this chapter is to size the two phase separator

V-101 that performs the separation of the incoming vapour from the first catalytic reactor

R-101 into a waste vapour stream and liquid propanal that would later enter the second

reactor, R-102. This separation therefore involves only vapour and heavy liquid. The

absence of a light liquid distinguishes this type of separator from the more conventional

three-phase one. This separator operates under high pressure but low temperature, at

1990 kPa and 10
o
C. Figure 2.1 below exhibits the schematic (not to scale) diagram of the

proposed two phase separator.



8

9

10


Figure 4.1: Schematic diagram of a horizontal two phase separator

Page 38

4-38


For pressure vessel, when vessel thickness, ,003.0 mtvessel 

𝐹𝑃,𝑣𝑒𝑠𝑠𝑒𝑙 =

𝑃 + 1 𝐷
2[850 − 0.6 𝑃 + 1 ]

+ 0.00315

0.003


=

2.189 + 1 2.1336

2[850 − 0.6 2.189 + 1 ]
+ 0.00315

0.003


= 2.39

The bare module factor for this process vessel (Turton et al., Analysis, Synthesis, and

Design of Chemical Processes, 3rd Edition, page 927) is:

CBM = Cp
°
FBM = Cp

°
(B1 + B2FMFp)

From Table A.4 (Appendix A), B1 = 1.49, B2 = 1.52

From Table A.3 (Appendix A), the identification number for carbon steel horizontal

process vessels is 18.

Hence, from Figure A.18 (Appendix A), material factor, FM = 1.0

And so,

CBM = 21 812.23 [1.49 + (1.52)(1.0)(2.39)]

= $ 111 739.69



Correlation:

CEPCI for year of 2010 is 622.6

CEPCI for year of 2001 is 397

Therefore,

New CBM = $ 111 739.69 x
622.6

397


= $ 175 237.11

= RM 529 917.01

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