A Simple Dean-Stark Apparatus Explained
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- čas přidán 21. 04. 2013
- Professor Davis explains how a simple Dean-Stark apparatus can be used to separate water from refluxing toluene. This example is particularly relevant to driving condensation reactions to completion in the laboratory.
This is the best explanation of the Dean-Stark Apparatus yet! Thank you!
Simple but excellent explanation.Thank You so much😊
very informative and still very simple. great animations! thank you
Thank you so much. This is well illustrated and explained
That was just simple and straight forward.....thank you
Love this video! Superb explanation!
Thank you so much.....Excellent and perfect info.!!👍
Great video - Will use the setup tomorrow :)
thank you ! i found exactly what i need to know ☺
Hi Alun, Thanks for the feedback. Be sure to subscribe and tell your friends about the channel!
Thank you so much, you have saved my so much time ❤
Glad you found the video helpful!!!
This made sense, thank you
Thank you for your nice and neet explanation
Thanks - quick and easy to understand, cheers man
Thanks for the comment. I am very happy that people are finding this video useful!
This is such a great video... May I know which software can use to create videos like this?
Excellent work!!
Best explanation. Thank you :)
Very Helpful.. Thank you very much...
Hello again, Dorota. The answer to this question will depend on the application. In the example of a condensation reaction, the water is forming as the reaction proceeds under heat, so I think it is fair to say that it *could* be just one phase at that point since the water concentration in the boiling flask is not likely to get too high (keep in mind it is being separated as it forms in such an example). However, the devil will be in the details!!!
Thanks, gutiesc! I'm glad it was helpful. Cool technique, isn't it?!
Nice! One additonal question. In boiling flask we have 2 phases or one phase?
Nice explanation!
Thank you so much!!! very helpful
Thanks for explanations
do you have any documents about distillation technical? or any formula, how to calculate the boiling the azeotropic ethanol watter mixed? thanks
Awesome video!!
Thank you so much, you saved me!
+Alessia Usai That's what I do! :-) I'm so glad you found it helpful.
Thank you soooooo much Sir 😭😭😭😭😭
The azeotrope is the vapor ascending to the condenser (in this case at 84 centigrade). Remember that this azeotrope in our example forms at 84 C. When the azeotrope cools to much lower temperatures (like 25 C in the room) it phase-separates. This is why the ascending vapor is of uniform composition (the azeotrope) but the liquid in the trap is bi-phasic! Cool, isn't it?!?!?!
But ... if the liquids phase separate when chilled, why not just chill the mother liquid in a separatory funnel and drain off the water.
@@mikaelbjornson2666 typically because the chemical reaction or physical process that we want to take place happens at much higher temperatures in the boiling flask
very good for me ...thanks
Do you use "anti bumping granules" ? If yes, what kind ?
I've seen it where they use those zeolite beads to pull the water out of the trap.
Great video btw, I'm just wondering how would you deal with organic material where density is greater than water, do you have a video?
+Joey T It is a pretty simple modification. Just draw from the bottom of the collector instead of the top to replenish the boiling flask. I will leave it to you to figure out the engineering ;-)
Ah thank you!
What is the temperature for heating?
Thank you 😫
I using this apparatus form imine and I am asked what is the amount of water that should be removed. Would you be able to explain how to calculate this amount?
Thank you indeed
Thank You
Thank you
Thanks!!
what are some alternatives to dean stark apparatus??
shout out Dr. Comar's class 2015 woot woot! ;)
Glad you liked it. Check out www.chemsurvival.com for info on my DVD course with The Great Courses!
Thank you!!
no problem! B-)
thx sir
Thankyou so much
I'm glad you found it helpful!
thank u
Is this procedure same for moisture determination in fats and oils?... please reply
Thear are quite a few ways to detemine the moisture content of a sample, and your selection will depend on the sample and your exact needs. That said, yes, the Dean Stark method is sometimes used to detemine the moisture content in food samples (I would expect 'fats and oils' might fall into that category). Don't overlook other methods like gravimetric loss on drying (LOD) and the volumetric/coulometric Karl Fischer method (titration with a standardized SO2 and iodine solution).
thanks
THIS IS BETTER THAN UNI
Why would toluene and water separate in the trap? In this example toluene is soluble in water, so wouldn't they be mixing the whole time they are in contact in the trap? What am I missing?
Toluene is not soluble in water.
@@thechiralkid6349 Thanks for the reply! I get that toluene is not soluble in water. My confusion really starts with how are they mixed in the boiling flask sense they are not soluble in each other? wouldn't the separation that happens in the column also happen in the boiling flask?
@@cjcrowley Toluene and water are separate as liquids in the flask. If they're not mixed, you would see toluene floating on top of the water. If the contents of the flask are mixed, you would still have blobs of one surrounded by the other just as if you had shaken a mixture of any two immiscible liquids. But toluene and water both boil, so they both wind up as vapor in the condenser and then they both condense and fall into the trap. It would all work even if there was no azeotropic mixture.
@@thechiralkid6349 But why not only pour the liquid in the boiling flask int a separatory funnel and drain out the water? Why bother boiling?
@@mikaelbjornson2666 You're right. If you just have water and toluene, you can boil off the azeotrope without a Dean-Stark trap, or using a separatory funnel would remove most of the water and then you could use a drying agent to remove the rest. The method is useful if water is generated in a reaction that's taking place in toluene. Then the removal of water with the return of the toluene solvent will drive the reaction equilibrium to the right. Wikipedia uses this specific example - a toluene-water mixture - in its article on the Dean-Stark apparatus. (I would have included a link to the article but I don't know how to do that and I'm too lazy to try to figure out how to do it.)
Duh why didn't I think of that! I have heard of it... even seen it before lol. Thankyou so much for this video... as well as doing it with toluene/water as the example. You just saved me hours of fractional distillation trying to recycle solvents LMAO!
I'm not in school RN... I just picked up o-chem last year as a covid apocalypse hobby. I figured when society collapses and people need stuff like medicine, gun powder, fuels, heck anything really... I WILL BE THE CATS PAJAMAS! (I'm like. "Awe shiiiit... Look who's getting into the underground bunker mansions for free bitches :-P ")
I love it though! If we get tuition relief I'm considering going back to school. It's like lego's for big kids lol!
huh??? if they separate when cold, why not just chill the mixture and use a sep. funnel??
Why not just simple-distill and than pour the collected liquid in a sep funnel ?
❤
I don't really understand why the water and toluene don't just mix and form another azeotrope at the trap.
In the flask it's boiling while in graduated tube it's falling down to the trap after condensation,so bcz of temperature change it doesn't form an azeotrope 😊
Where is azeotrope?
Yeh "toluene"... that's why I'm here...
see these days i am considering the electrical bonds of opposing or like charges in or as Chem,,and organic natural liquid or Ester salts of crystals are responsive to frequency and electrons moving along these waves see,,like on the shell of the atom or the Bhor ring thingy,,i mean doing it with heat is fine,,,and as old as it gets,,same with chemicals,,However Fire is a Bond of the oxygen taking the + and giving the -- in the dance,,,so,,, Water is Hydrogen it loves to bone with Oxygen,,so,,Electrolysis becomes the way to break their Heart and separate Them...right on,,so that is my advance mint in bonds and stocks in our quantum Chemical magnetic electric universe.,,Energy compresses into matter or close and expands out to energy again,,and again,,Osmosis by Heat is well understood,,you go into the Electric stuff
Thoth will be Proud,,,Professor...
what? can't hear shit