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Enthalpy And Enthalpy Of Formation Difference


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#1 ankitg009

ankitg009

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Posted 05 May 2015 - 02:26 AM

Hey All

 

I had been performing simulation on a stream whose composition and thermodynamic data can be found in the pdf file attached.

 

While going through the data report, i found two values of enthalpy. One is simply enthalpy and one is enthalpy of formation.

 

No chemical reaction is fed in the simulation tool. Than from where the enthalpy of formation is coming.

 

 

Can someone please explain to me what is the difference between these values are? How can we obtain them theoretically? Why enthalpy of formation is negative while enthalpy is positive? In heat balance which enthalpy we should consider.?

 

 

Note: I had been using COCO simulation tool. I haven't fed ant reactions and interested to know the property of stream a t particular temp., pressure and composition.

 

Similarly i did the simulation on Unisim, there only one enthalpy is given, that too is negative. What does it mean.??

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#2 shan

shan

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Posted 05 May 2015 - 06:22 AM

Enthalpy is relative value.  If the reference point is  water enthalpy = 0 j/mol at 0 bar, 0 c, your stream enthalpy may be positive or negative. 






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