3 replies to this topic

[AAsif]

Hello,

 

I've been given a project of selecting and designing a shell and tube partial condenser for the effluent process stream leaving a thermal chlorination series.  Cooling water is used to partially condense the stream before entry to an HCl recovery column.   The process stream contains:

 

Methyl chloride (0.42 mole fraction)

Methylene chloride (0.21)

HCl (0.32)

the rest are impurities and heavier chlorinated derivatives. 

 

Total flow rate = 274.8 kmol/hr

Inlet T = 111^oC

Design Outlet T = 32^oC

Inlet P = 4bara

Max Pressure drop = 0.5bara

 

For the cooling water: inlet T = 22^oC, max return T = 35^oC, inlet P = 5bara,  Max Pressure drop = 2bara

 

 

I would just like an opinion on choosing an appropriate type and configuration of exchanger.   

 

Any help would be very much appreciated!!

Edited by AAsif, 18 May 2015 - 09:06 PM.

[srfish]

I believe your thought on putting the chemicals in the shell side is good.

 

Since there is a temperature cross in the operating temperatures, you will need a G-type or F-type shell.

[S.R.Shah]

HI Asif

 

1.HCl is non Condensable Gas

2.Condensation in Horizontal side has higher Condensate temperature so sub cooling area is required

3.You can opt also for Graphite  heat exchanger and tube side condensation if Design and Test pressure allows

4,Keep temperature of Gas outlet at least 5 ⁰c Lower temperature than return temperature of cooling water

5.Do check whether secondary condenser with chilled water  which may require for good condensation

 

SRSHAH

Edited by S.R.Shah, 17 May 2015 - 09:12 PM.

[S.R.Shah]

Hi Aasif

 

Methyl chloride condensation point at 5.0 Bar is +22 degc

Source-Wikipedia

 

SRShah