5 replies to this topic

[Hazem Hawwash]

Hi All,

 

I am currently designing a flash drum for separating a non-ideal mixture of methanol and water. Pressure is being reduced from 8 bar to 1 bar. I have calculated the bubble point temperature and dew point temperature for the mixture. I have found the bubble point temperature to be 340.978 K (67.828 degC), and the dew point temperature to be 347.235K (74.805 degC). However, I am unsure as to how to calculate the temperature of the flash drum. I would be very grateful if somebody could shed some light on this.

 

Kind regards,

 

 

Hazem Hawwash 

Edited by Hazem Hawwash, 21 July 2016 - 05:54 PM.

[Bobby Strain]

You calculate the phases based on VLE and enthalpy. It's a trial and error process. Unless you have a simulator.

 

Bobby

[breizh]

http://www.questcons...properties.html

 

You may  use this resource to support your work .

 

Good luck

 

Breizh

Edited by breizh, 22 July 2016 - 01:50 AM.

[Hazem Hawwash]

Thank you Bobby and Breizh, I took on your advice and it worked. I am now in the process of using Lewis Sorrel method to prove my previous calculations. However, I have varying relative volatility and it is not constant. As you may know, Lewis sorrel method uses y-values to calculate x. Is there a way of calculating the relative volatility using the vapour mole fractions only?  Much appreciated. 

 

Kind Regards,

 

Hazem Hawwash 

[breizh]

Hi,

 

Other resources I developed .

 

Consider the link attached too ! videos 42&43

 

https://cosmolearnin...energy-balance/

 

Hope this helps .

 

 

Breizh

Edited by breizh, 25 July 2016 - 12:43 AM.

[Hazem Hawwash]

I shall give these a go. Thank you very much.