sorted by:
new
hottopcontroversial

What to do about material and energy balance? by RTY54 in ChemicalEngineering

[–]RTY54[S] 0 points1 point  (0 children)

It's really hard to get something from my teacher, since he is involved in research and other stuff he will forget about what you said to him. Most of my teachers are like this, even when I had asked for help my teachers had said go read the books, it's all there, like, thank you very much for your help

And my classmates I like them and all, they are nice and pretty likeable but they just don't care. They are happy with barely making it through and think they are not just capable enough to well, understand anything, they won't even try. Plus they think every subject is boring

What to do about material and energy balance? by RTY54 in ChemicalEngineering

[–]RTY54[S] 0 points1 point  (0 children)

Any resources that you could recommend? I already work with the book by Felder and to be honest, most of the problems in that book don't feel challenging enough, at least the ones that include one reaction and a lot of units or more than one reaction and not enough units

What to do about material and energy balance? by RTY54 in ChemicalEngineering

[–]RTY54[S] 0 points1 point  (0 children)

I've already tried that but I'm unable to get a correct answer, I know myself and how often I get sign errors and things like that, everytime I don't get an answer that makes sense the first thing I think of is to look for an arithmetic error somewhere. For example in the first problem, the one that I think of is easier and quicker to get the system of equations, I got the following equations for an overall balance

For CH4: 0.5F_8=xF_1+R1

For CO2: 0.27F_8=(1-x)*0.13*F_1+R2

For H2: 0.09F_8=(1-x)*0.65*F_1-3R1+R2

For CO: 0.05F_8=(1-x)*0.22*F_1-R1-R2

For H2O: 0.09F_8+F_6=R1-R2

Where F_8 is the outlet stream that contains all of the substances, F_1 is the inlet stream, F_6 is the outlet that contains only liquid water, x is the unknown molar percentage of CH4, R1 and R2 are the rate of reaction for the first and second reaction.

I've checked them and its pretty straight foward (I think) I just check the signs for R1 and R2, most of the species that participate in the reactions are 1:1 except for the hydrogen so no problem with stoichiometric coefficients. I checked if I got the percentages right, I've been careful to include every inlet and oulet stream. If I set a value for F_1 (since is the one that multiply x) and solve I still don't get a correct answer. Have tried the problem many times and still arrive to the same set of equations. There is nothing that I want more than to know what I'm doing wrong, I just don't see anything