March 28, 2024, 12:32:47 PM
Forum Rules: Read This Before Posting


Topic: methanol and isopropanol  (Read 10222 times)

0 Members and 1 Guest are viewing this topic.

rhyeal

  • Guest
methanol and isopropanol
« on: May 27, 2004, 11:53:50 AM »
is there any case where methanol and isopropanol would bond to raise/lower the boiling point of each other?  we are doing a sludge project and the data we have is close to either, save the boiling point which is 79C.  this is closer to isopropanol, but the time/temp data we have suggests that there is a plateau at 75C and again at 79C.  the way we see it is either of these could be isopropanol or methanol.  any help would be great as this project is due tomorrow and we only discovered the apparent Liquid C plateau today.

Thanks,
Rhyeal

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
Re:methanol and isopropanol
« Reply #1 on: May 27, 2004, 01:09:42 PM »
I don't have any data for you, but I do have some theory.

Check out Raoult's Law.

Note both methanol and isopropanol contributes to the vapour pressure (being volatile), their residual proportion to each other will decide the boiling point for the mixture.
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

Offline Mitch

  • General Chemist
  • Administrator
  • Sr. Member
  • *
  • Posts: 5298
  • Mole Snacks: +376/-3
  • Gender: Male
  • "I bring you peace." -Mr. Burns
    • Chemistry Blog
Re:methanol and isopropanol
« Reply #2 on: May 27, 2004, 02:13:24 PM »
Can you take any spectral data? Like an NMR or maybe look at the firgerprint in IR?
Most Common Suggestions I Make on the Forums.
1. Start by writing a balanced chemical equation.
2. Don't confuse thermodynamic stability with chemical reactivity.
3. Forum Supports LaTex

Offline hmx9123

  • Retired Staff
  • Full Member
  • *
  • Posts: 897
  • Mole Snacks: +59/-18
Re:methanol and isopropanol
« Reply #3 on: May 27, 2004, 09:56:10 PM »
Another good way to test is just to smell the sample.  If it smells like rubbing alcohol, it's i-PrOH.  If it's got more of a sweetish odor, it's MeOH.

Offline jdurg

  • Banninator
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 1366
  • Mole Snacks: +106/-23
  • Gender: Male
  • I am NOT a freak.
Re:methanol and isopropanol
« Reply #4 on: May 27, 2004, 10:01:39 PM »
Is it possible for the methanol and isopropanol to maybe form an azeotrope?  (I don't recall ever hearing of an MeOH and Isopropanol azeotrope, but organic was never my strong field).  :P
"A real fart is beefy, has a density greater than or equal to the air surrounding it, consists

Offline hmx9123

  • Retired Staff
  • Full Member
  • *
  • Posts: 897
  • Mole Snacks: +59/-18
Re:methanol and isopropanol
« Reply #5 on: May 27, 2004, 10:06:17 PM »
Might be.  I'm sure they're miscible in one another, so it may well be a mixture.

Sponsored Links