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Boiling Point


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#1 Chem32

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Posted 28 July 2019 - 11:14 PM

Dear sirs,
Normal boiling point of MTBE is 55.2 deg C and normal boiling point of methanol is 64.7 deg C. Methanol got more latent heat of vaporization compared to MTBE. My question is at high pressure will methanol boil at less temperature compared to MTBE?

Edited by Chem32, 28 July 2019 - 11:19 PM.


#2 breizh

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Posted 29 July 2019 - 01:56 AM

https://www.cheric.o...rop/cmpsrch.php

 

You may want to calculate the vapor pressure of the pure components .

Use the data base above with Cas number or other entries (formula ,..)

cas number :

MTBE 1634-04-4

Methanol :67-56-1

 

Good luck

Breizh 

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Edited by breizh, 30 July 2019 - 03:00 AM.


#3 Chem32

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Posted 30 July 2019 - 04:33 AM

Thank you Mr.Breiz

#4 breizh

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Posted 30 July 2019 - 07:25 AM

http://vle-calc.com/...alculation.html

Hi,

You might be interested with this calculator . My understanding is that Methanol +MTBE form an azeotrope .

Good luck

Breizh 



#5 Chem32

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Posted 02 August 2019 - 12:10 PM

Thank u Mr.Breizh. Can you provide me any document related to azeotropic composition of methanol and MTBE?

#6 MrShorty

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Posted 02 August 2019 - 01:31 PM

The same database that was linked to in post #2 also has a database of binary VLE. You should be able to search for methanol/MTBE and see what data they have.

 

The Dortmund Data Bank also has binary VLE data (though they are less inclined to give it away for free): http://www.ddbst.com/ddb.html

 

One could also put the two compounds into UNIFAC to estimate activity coefficients and VLE to estimate the azeotrope composition.



#7 Bobby Strain

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Posted 02 August 2019 - 04:46 PM

I don't recall that it is a problem. If you look at a flowsheet for making pure isobutene it involves converting isobutene in a mixture by reacting with methanol to form MTBE. The resulting mix is separated first to recover MTBE as a bottom product. Then removing light materials and heavy materials via fractionation. Then cracking the MTBE stream to generate methanol and isobutene. I don't recall there being any azeotropes. You can search for CDTECH and ask them.

 

Bobby



#8 breizh

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Posted 02 August 2019 - 09:54 PM

http://www.azeotrope.info/

 

hi,

Take a look .

Good luck.

Breizh

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Edited by breizh, 03 August 2019 - 11:48 PM.





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