The technique of evopration/sepration and distillation under reduced pressure of low boiling point solvents without bumping by constant roation from powders well explained.
Hello. I have a rotary evaporator with a condenser coil with your typical in and out for your chiller and a vacuum line but then I’ve got another threaded glass connection and I have no clue what it would be used for. I’ve searched everywhere on RUclips but can’t find any information on it can you help?
Remember that the purpose of rotary evaporation is to collect a non volatile material remaining in the rotating boiling flask. This means that the solvent that condenses in the dimroth and ultimately falls until the trap is waste. It is always best to empty the rotovap trap and clean the system when you're done, but if multiple people need to use the rotovap and their solvents are compatible but not needed, then it's possible to simply wait and empty the trap and clean the rotovap condensers afterward.
After evacuated system, the pressure become low. Then we heat the solfent. This is what I want to ask. While we heating the solvent, does the pressure go up? And if the pressure rises, should we lower the pressure by evacuating again?
The process will be somewhat slower since the exposed surface area of the solvent will be reduced, but the biggest concern for me would be bumping. Bumping is a term we use to describe flash-boiling in which the boiling solution is heated unevenly and froths up and shoots into the neck or even the condenser without having fully vaporized. Bumping can deliver non-volatile solute to the trap, leading to decreased recovery.
Is it ok if cold water wont be placed on volatiles? I’m afraid the extracted solvent will solidify if i put the cold water on it. Need this for research purposes. Thank u
The reason I know about roto vaps is they use it to make Cannabis concentrates. Specifically for a process they call "winterizing" the concentrate where they mix it with ethanol, put that in a cold freezer, then filter it through a Buechner funnel and all of the wax stays on the filter in the Buechner funnel. After that they use the rotovap to distill and collect the ethanol. The part I don't understand is why is this better than just doing a simple distillation of the ethanol?
Because the rotary evaporator does this under a vacuum, which lowers the effective boiling point of the solvent. The lower the temperature the solvent can be boiled and thereby vaporized, the less heat is applied to the organic compounds that you want to remain in the boiling flask. The lower the heat, the less damage (think cooking) of the organic compound you are trying to isolate (concentrate). This is especially important with organic compounds (like those in cannabis) which can be rather delicate and sensitive to heat. Traditional distillation uses high heat to boil the solvent (an example would be the traditional distillation of beverage alcohol spirits). The "traditional" process heats the solvent (ethanol in my example of beverage alcohol spirits) to a high temperature to boil the solvent and cause it to evaporate. With rotary evaporation, the higher the vacuum that can be used, the lower the temperature you need to cause the solvent to boil. At standard atmosphere pressure, approximately 30 Inches Hg (Inches Mercury), ethanol boils at 173.1°F (or 78.37°C), but reduce the pressure to 9 inches Hg and you only need around 120°F (or 49°C) to boil the ethanol. If you can get a vacuum down to around 2 Inches Hg, then the ethanol will boil at about 65°F (or 18°C).
@@Whiskeyiceco then why dont you do a simple vacumm distilation, why do you need to this much for the setup . Cant you just use magnetix stirrer for the same purpose ?
Question from a newbie that is very new to this- Why isn't the volatile solvent being sucked out the top of the dimroth, where the vacuum line is located? Is the cooling action of the dimroth the only reason why the volatile solvent doesn't go up and into the vacuum line? This chemistry stuff is blowing my mind. Very very interesting.
The risk of sucking all the vapor our is very low. If the assembly is tight and no air gets sucked in the unit, there will not be an "air stream" and that means solvent remains in the rotary evaporator. I always recommend the use of a vacuum controller as with that you can set a specific vacuum according the solvent you like to distill. by doing so, you even can separate different solvents and the need of an ice bucket is also not needed anymore. Great tool and easy to run, even in a kitchen to mage essential oils or moonshiner ;-)
If you do get volatile vapour going out through the top and into the pump, do you usually have some sort of scrubber in the vacuum line to protect the pump?
The serpentine in the condenser, through the cooling water, is intended to cool the gaseous material into a liquid state, thus entering the collection bottle.The connection to the vacuum tube is on the top of the condenser for two purposes. 1. It is the experimental environment that becomes vacuum and the material becomes more easily into the gaseous state. 2. Provide the power to the gas flow, which is the target material becomes the gas phase, and flows to the condenser more quickly and accelerates the purification. This is Leric.from China ,a factory for these equipments,If you need any or have any questions,pls feel free to tell me Email: 3359617048@qq.com
The serpentine in the condenser, through the cooling water, is intended to cool the gaseous material into a liquid state, thus entering the collection bottle.The connection to the vacuum tube is on the top of the condenser for two purposes. 1. It is the experimental environment that becomes vacuum and the material becomes more easily into the gaseous state. 2. Provide the power to the gas flow, which is the target material becomes the gas phase, and flows to the condenser more quickly and accelerates the purification. This is Leric.from China ,a factory for these equipments,If you need any or have any questions,pls feel free to tell me Email: 3359617048@qq.com
Air is removed using a vacuum pump that is attached to the body of the Dimroth condenser. Usually a house vacuum line (many labs are equipped with one) or a small piston vacuum pump are adequate to provide the vacuums needed for this technique.
who has seals for the older R-11 u nits? Shame to see so many for sale on ebay without disclaimers honestly informing potential buyers that without such seals the roto vaps are useless junk.
In order to provide the power of gas flow, the steam can flow better and improve the purification efficiency. I am a factory in China, specializing in the production of these laboratories. If necessary, please contact me. Email address:3359617048@qq.com My name :Leric
The vacuum allows you to keep the temperatures low. Lower pressure = lower boiling point. Sometimes you don't want to heat up the solvent to its standard pressure boiling point
Noi stupid at all.... this is an awesome quetion!!!! Basically, this is the same process as boiling solvent away... but with three REALLY important caveates: 1. Normal boiling happens at 1 atm pressure, and you can roast your solids into a nice black sludge if they are thermolablile or you don't catch them the moment the solvent is removed. Hotplate surfaces and thermowells can get crazy hot and wreck the material you are trying to collect. Using reduced pressure allows us to use less heat. 2, The solvent that is removed is "trapped" and can be disposed of properly , rather than released to the atmosphere as they are when boiling an open container. Some solvents are greenhouse gasses, some are reactive, some are just plain stinky. 3. Even considering the setup time, this is a much faster way to recover solute, since the pressure is reduced and many lower volatility solvents come strearming over when they would boil away slowly at atmospheric pressure. Its a 'win', 'win', 'win' situation when trying to recover a nonvatile solute! Cheers, Professon Davis
@@Nathouuuutheone the rotation and evacuation help to blast anything and everything that will vaporize into the trap as quickly as possible leaving behind only the non-volatile material in the original flask. Traditional distillation is more about finessing one slightly more volatile compound away from another slightly less volatile compound
It is amazing how well and precisely you explained Rotary Evaporation. Congratulations and thank you very much for uploading the video.
The technique of evopration/sepration and distillation under reduced pressure of low boiling point solvents without bumping by constant roation from powders well explained.
This video was very helpful. Explanation was clear and concise, and the graphics ROCKED! Thank you!
Great video, perfectly explained. Very glad to have found your channel.
Thank you for the clear explanation! This is really helpful for my lab report!
Great explanation and graphics. Thank you.
thanks for your time and knowledge. Good job on video and again thx
Thank you very much! Your videos help me a lot
Thank you so much, u r very clear with your explanation....I don't know how to thanks because you are really helpful ....thanks infinite
Awesome vid, thanks for the expert knowledge. Appreciate the simplicity in the process description. Thumbs uppp all the way.
Amazing explanation. Many thanks.
Cool .. thanks for your explanation
Please upload more about other stuff
Jai Ho Bhai jo kaam mera professor nai ker saka wo Tu ne 8 minute mai ker diya 👌👌👌
Amazing vids thank you
Very nice video!
Well understood thank you 🙏
Thank you so much!
Thanks a lot
Thanks!
Best video ever! Thanks so much for sharing your knowledge :)
+Chinthamanee Lankatillake Thanks for the kind words. :-)
Best video ever? RUclips also has kitten videos. Are you aware this?
@@newnotification30 SERIOUSLY?!?!?!?!?
0.o
Great video I loved how you explained the process
Love you guys
very good!
Nice job. Thanks
Thnx, mate
Great
Hello. I have a rotary evaporator with a condenser coil with your typical in and out for your chiller and a vacuum line but then I’ve got another threaded glass connection and I have no clue what it would be used for. I’ve searched everywhere on RUclips but can’t find any information on it can you help?
Good video
Does previous material used in roto, contaminate the condenser coils or is it just pure alcohol that is being extracted from the boiling flask?
Remember that the purpose of rotary evaporation is to collect a non volatile material remaining in the rotating boiling flask. This means that the solvent that condenses in the dimroth and ultimately falls until the trap is waste. It is always best to empty the rotovap trap and clean the system when you're done, but if multiple people need to use the rotovap and their solvents are compatible but not needed, then it's possible to simply wait and empty the trap and clean the rotovap condensers afterward.
After evacuated system, the pressure become low. Then we heat the solfent.
This is what I want to ask.
While we heating the solvent, does the pressure go up?
And if the pressure rises, should we lower the pressure by evacuating again?
What is the strength of the vacuum pump used in this system? How much 'pull' should you use if you don't want to break the glass?
The maximum vacuum is 0.098mpa, which is introduced on our website。www.zzkeda.com/rotary-evaporator.html
This video is very helpful. What will be the problem is the spin is not working?
The process will be somewhat slower since the exposed surface area of the solvent will be reduced, but the biggest concern for me would be bumping. Bumping is a term we use to describe flash-boiling in which the boiling solution is heated unevenly and froths up and shoots into the neck or even the condenser without having fully vaporized. Bumping can deliver non-volatile solute to the trap, leading to decreased recovery.
Nice
thought provoking
Is it ok if cold water wont be placed on volatiles? I’m afraid the extracted solvent will solidify if i put the cold water on it. Need this for research purposes. Thank u
What solvent are you using? Alcohol?
The reason I know about roto vaps is they use it to make Cannabis concentrates. Specifically for a process they call "winterizing" the concentrate where they mix it with ethanol, put that in a cold freezer, then filter it through a Buechner funnel and all of the wax stays on the filter in the Buechner funnel. After that they use the rotovap to distill and collect the ethanol. The part I don't understand is why is this better than just doing a simple distillation of the ethanol?
Because the rotary evaporator does this under a vacuum, which lowers the effective boiling point of the solvent. The lower the temperature the solvent can be boiled and thereby vaporized, the less heat is applied to the organic compounds that you want to remain in the boiling flask. The lower the heat, the less damage (think cooking) of the organic compound you are trying to isolate (concentrate). This is especially important with organic compounds (like those in cannabis) which can be rather delicate and sensitive to heat. Traditional distillation uses high heat to boil the solvent (an example would be the traditional distillation of beverage alcohol spirits). The "traditional" process heats the solvent (ethanol in my example of beverage alcohol spirits) to a high temperature to boil the solvent and cause it to evaporate. With rotary evaporation, the higher the vacuum that can be used, the lower the temperature you need to cause the solvent to boil. At standard atmosphere pressure, approximately 30 Inches Hg (Inches Mercury), ethanol boils at 173.1°F
(or 78.37°C), but reduce the pressure to 9 inches Hg and you only need around 120°F (or 49°C) to boil the ethanol. If you can get a vacuum down to around 2 Inches Hg, then the ethanol will boil at about 65°F (or 18°C).
@@Whiskeyiceco then why dont you do a simple vacumm distilation, why do you need to this much for the setup . Cant you just use magnetix stirrer for the same purpose ?
Question from a newbie that is very new to this-
Why isn't the volatile solvent being sucked out the top of the dimroth, where the vacuum line is located? Is the cooling action of the dimroth the only reason why the volatile solvent doesn't go up and into the vacuum line? This chemistry stuff is blowing my mind. Very very interesting.
I was having the same doubt
The risk of sucking all the vapor our is very low. If the assembly is tight and no air gets sucked in the unit, there will not be an "air stream" and that means solvent remains in the rotary evaporator. I always recommend the use of a vacuum controller as with that you can set a specific vacuum according the solvent you like to distill. by doing so, you even can separate different solvents and the need of an ice bucket is also not needed anymore. Great tool and easy to run, even in a kitchen to mage essential oils or moonshiner ;-)
If you do get volatile vapour going out through the top and into the pump, do you usually have some sort of scrubber in the vacuum line to protect the pump?
The serpentine in the condenser, through the cooling water, is intended to cool the gaseous material into a liquid state, thus entering the collection bottle.The connection to the vacuum tube is on the top of the condenser for two purposes.
1. It is the experimental environment that becomes vacuum and the material becomes more easily into the gaseous state.
2. Provide the power to the gas flow, which is the target material becomes the gas phase, and flows to the condenser more quickly and accelerates the purification.
This is Leric.from China ,a factory for these equipments,If you need any or have any questions,pls feel free to tell me
Email: 3359617048@qq.com
The serpentine in the condenser, through the cooling water, is intended to cool the gaseous material into a liquid state, thus entering the collection bottle.The connection to the vacuum tube is on the top of the condenser for two purposes.
1. It is the experimental environment that becomes vacuum and the material becomes more easily into the gaseous state.
2. Provide the power to the gas flow, which is the target material becomes the gas phase, and flows to the condenser more quickly and accelerates the purification.
This is Leric.from China ,a factory for these equipments,If you need any or have any questions,pls feel free to tell me
Email: 3359617048@qq.com
Can I desalinate ocean water into potable water with this device?
Kinda, a filter would work better
that is amazing, how we get the file ? could you send it the ppt ? thanks more time
If you blow thru the condenser while holding the outlet and it builds pressure, you know it's good. I usually have your mom do this.
How the evacuation takes place ? How the air gets out of the rotory evaporation
Air is removed using a vacuum pump that is attached to the body of the Dimroth condenser. Usually a house vacuum line (many labs are equipped with one) or a small piston vacuum pump are adequate to provide the vacuums needed for this technique.
better
who has seals for the older R-11 u nits?
Shame to see so many for sale on ebay without disclaimers honestly informing potential buyers that without such seals the roto vaps are useless junk.
WHy do you need vaccum?
In order to provide the power of gas flow, the steam can flow better and improve the purification efficiency.
I am a factory in China, specializing in the production of these laboratories. If necessary, please contact me.
Email address:3359617048@qq.com
My name :Leric
In addition, the vacuum environment can reduce the temperature required for the test material to change from liquid to gaseous state.
Leric Zhang Thank you Mister zhang
Leric Zhang sup with purchasing one
The vacuum allows you to keep the temperatures low. Lower pressure = lower boiling point. Sometimes you don't want to heat up the solvent to its standard pressure boiling point
Wow #tool ⚗️
Why don't you just boil off the liquid if the solute is solid?? Maybe a stupid question
Noi stupid at all.... this is an awesome quetion!!!!
Basically, this is the same process as boiling solvent away... but with three REALLY important caveates:
1. Normal boiling happens at 1 atm pressure, and you can roast your solids into a nice black sludge if they are thermolablile or you don't catch them the moment the solvent is removed. Hotplate surfaces and thermowells can get crazy hot and wreck the material you are trying to collect. Using reduced pressure allows us to use less heat.
2, The solvent that is removed is "trapped" and can be disposed of properly , rather than released to the atmosphere as they are when boiling an open container. Some solvents are greenhouse gasses, some are reactive, some are just plain stinky.
3. Even considering the setup time, this is a much faster way to recover solute, since the pressure is reduced and many lower volatility solvents come strearming over when they would boil away slowly at atmospheric pressure.
Its a 'win', 'win', 'win' situation when trying to recover a nonvatile solute!
Cheers,
Professon Davis
Bump
Okay but why?
Seriously? To recover nonvolatile solutes from solution.... It is explained in the first 30 seconds of the video
@@ChemSurvival I mean how does it do it any better than other distillation rigs?
@@Nathouuuutheone the rotation and evacuation help to blast anything and everything that will vaporize into the trap as quickly as possible leaving behind only the non-volatile material in the original flask. Traditional distillation is more about finessing one slightly more volatile compound away from another slightly less volatile compound
Nice
Thanks 😎