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[Kentucky08]

Good day, everyone.

 

I am currently doing a material balance of a transesterification section. The MeOH fed is excess. Based on the problem, MeOH is present in CME (biodiesel) in 5% mass weight while it is present in its by-product, glycerine, in 45% by mass weight. I calculated the values by two equations and two unknowns.

 

By Methanol balance:

0.05(CME) + 0.45(Crude Glycerine) = Amount of Excess Methanol

By OMB

ECNO+MeOH+Catalyst= CME+Crude Glycerine

 

I am able to calculate the amount CME and Crude Glycerine using these two equations; however, the amount of MeOH calculated is not same as amount of excess Methanol. 

 

Can I ask for everyone's help?

 

Thank you so much!

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[breizh]

Hi,

Don't duplicate posts, please delete one.

BTW share with us the problem statement.

Don't use acronyms without explanation ( ECNO,FAME,CME,Etc), Glycerin or Glyceride ? mismatch word text  and excel sheet.

For those interested with the subject: Links underneath

 https://www.e-educat...gee439/node/684

 

https://journeytofor.../macromodx.html

 

The first link should suffice to support your calculation:

Note: MW fatty oil and Biodiesel are the same (#). Quantity of methanol used is the same (#) than quantity of Glycerin generated based on stoichiometry: 

1-ton fatty oil+100 kg methanol > 1 ton Biodiesel +100 kg of Glycerin.

catalyst (NaOH) # 1% vs Fatty oil # 10Kg 

 

Total quantity of Methanol used to produce 1 ton of Biodiesel # 100+ 0.45*100+0.05*1000 = 195 Kg methanol 

 

 

Breizh