Recent content by _Greg_

Thanks Vulgar Just wasn't sure because there's different forms of the antoine equation, some say Psat, other just say P. Could have done this like 2 years ago, now in my final year I struggle with some of the basics lol. Cheers for clearing that up ;)

Right so basically, I'm doing a multicomponent distillation with some exotic chemicals. My feed comes in at 13kPa and 60*C, so it's under vaccum. This will be a two phase mixture. What I need is the vapour-liquid-equilibrium coefficients, 'K- values' at feed conditions. I'm basing this on an...

Please, anyone, I seriously feel like dropping out at this rate :(

Hi folks I'm currently in my last year of my chemical engineering degree and doing a design project on the manufacture of acrylic acid. I have the job of designing a solvent recovery column, where a mixture of Methylisobutylketone (MIBK) solvent (heavy key) and acrylic acid (light key) are...

oh yea, woops The question is: obtain the process response Y(t) as deviation from its initial steady state condition y(0). Use Laplace transforms and expansion by partial fractions. Assume a unit step forcing function x(t) = u(t) The initial equation is 9y''(t) + 9y'(t) +4y(t) = 8x(t) - 4

-4.5 * 2 = -8 -4.5 * 0.441i = 1.9845i 3.969i * 2 = 7.938i 3.969i * 0.441i = 1.75i just used that 'foil' method

I kinda get you, see if this is right: 8 ----------------------- 9(-0.5+0.441i)(2*0.441i) 8 ----------------------- (-4.5+3.969i)(2*0.441i) 8 ------------------------- -8 -1.9845i + 7.938i +1.75i 8 --------------- -8 +...

How did you simplify the bottom line down to -3.50066 - 3.969i ? What do you do with the 9? I find it confusing because its (...+...)(...x...) not ++ or xx My basic maths has left me lol. Thanks

Homework Statement It's hard to explain, I can do everything exept get the answer to what I'v pointed out below. I just don't know what order to solve it into get the correct answer, I must have tried every method except the right one! Homework Equations The Attempt at a...

Homework Statement The flowrate leaving the tank is regulated by a partially open valve, You may assume that the pressure drop in the exit pipe system is across the valve itself. The cross sectional area is 1m2. At steady state, the water level inside the tank is measured to be 1m...

Thanks for the input Smith and everyoe else. Unfortunately I never got the go-adead for this project as my tutor thought it would be too difficult and time consuming, plus they were meant to observe my work in college. I ended up doing HPLC analysis on various different types of chocolate (for...

Homework Statement Question: A mixture of 40/60 mole% pentane/heptane is to be separated to give a top product of 95 mole% pentane and a bottom product of 5 mole% pentane. The column will operate at 1 bar witha reflux ratio of 0.5 kmol/kmol. It will have a total condenser and a partial...

aaaaaaah, I see, I thought that little n symbol was pi. And of course, it all adds up to 180*, high school maths is all coming back now :rolleyes: Many thanks :smile:

Thanks for the fast reply tiny tim. But how would you know its a 30* triangle, and how do you know cos pi/6 = sqrt3/2 Like sin pi/6, is pi close enough to 3 to just call it 3/6? I don't really know much of the basics, I'm pretty much learning this for the deep end, looking for trends to...

Homework Statement So I have the problem questiona dn my teachers solution posted below. I understand: f(xo) = sin pi/6 f '(xo) = cos pi/6 but i don't know how he gets them into fraction form with the SQRT of 3, it looks like some pythagoras but i don't really know how he did it...