"I wonder how mercury would do if run through an aspirator pump" -- dangerous thought of the day

@AltoidJTP

7 жыл бұрын

Assuming you could get it flowing fast enough, the low vapor pressure of mercury should make for a nice vacuum.

@dawidflak2239

7 жыл бұрын

Cody'sLab i'd love to See this in action. Maybe because of the high density of mercury you wouldn't even have to use pump? Just a reservoir placed at a high elevation, we both know u have more than enough quicksilver to do it. Give me a shout in your vid if u decide to do it :D

@Lossanaght

7 жыл бұрын

I believe that is called a Sprengel pump

@Lossanaght

7 жыл бұрын

Gummy Bugz Not sure, it's entirely likely he found it on his own. If not I wish I had thought to post the link to the self acting version that I posted in his video's comments.

@hamishferguson4166

6 жыл бұрын

that and the fact cody treat Hu like water

Maybe i'll concentrate hydrogen peroxide or sulfuric acid with this system. Anyway, I'm still remaking all the chemicals for the pyrimethamine synthesis so that's taking awhile. i'm not sure when the next video for that will be up. Next immediate video might be something on matches, we'll see. On a different note, good luck to all you students who will be returning to school/college/university soon.

@jamie91995

7 жыл бұрын

Thank you, Im Going back tomorrow, and sadly I was forced to quit chemistry so now everyone at school will be asking me about it...

@ethanping1010

7 жыл бұрын

Yes that would be amazing to see you concentrate hydrogen peroxide please really consider making that video... Thank you

@unity2702

7 жыл бұрын

Do you disguise your voice?

@user-zu1hi4br4t

7 жыл бұрын

do you edit you're voice and why. you don't have to answer that I was just wondering. by the way you're channel is great keep up the great work! love your vids.

@redmohawkguy1

7 жыл бұрын

Thank you NurdRage. I will be starting college on September 3rd. I'm going to major in, you guessed it, chemistry, your videos are what originally sparked my interest in the subject.

Mr. NurdRage, Thank you for this video, we need more people like you

Distilling water at 39°C with your set up is impressive ! Well done :)

@NurdRage

7 жыл бұрын

It gets BETTER! :)

@gigglysamentz2021

7 жыл бұрын

Oh god I just watched the rest of the video: 19°C??? This is crazy !

I've done this sort of thing before with a similar setup. It never occurred to me though, to use ice water. It makes a lot of sense now that I'm thinking about it. Thanks for the tip...

Amazing, you deliver once again, thank you sir!

Amazing. I want to try and make this for reducing juices and sauces etc. Thanks for the tip

Very useful information. I wish I was taught this in my chem undergrad

Que grande eres !!!!! I don´t know how to translate this but it feels so good watching this video....( and the one you made before it, and the one you made after, and the following......and the videos of the last year......... Thank you very much!!!!!!!!

Thanks for the video, about 10yrears ago I was trying to concentrate H2O2 from 50% to around 80% with a home made aspirator pump. But at the time I was just using water from the tap so was limited in pressure. So I might have to try this again with your setup.

Wow i had no idea this simple principle is capable of making a vacuum this good.

That is honestly brilliant.

I remember having these vacuum pumps made as glassware as I was a kid. Couldn't use them for vacuum pumping those days, though, because of a lack of a high pressure water source. But they made great toys for the bath. I imagined them to be submarines.

This is an awesome video, exactly what I was looking for; thanks a lot

thank you very much NurdRage, i'm building a diy fume hood and the vacuum line was a big deal, i have a 1 stage vacuum pump (for changing refrigerant in refrigerators) but water vapour is a big no for this kind of pumps ( acids and solvents are even bigger nope). many amateur chemists use the venturi pump, but as you said, using it from the tap is really a waste of water, but this setup really saved me :D

Very helpful. I always wanted to know a cheap and effective vacuum system. I had always used an aspirator from a pet store used for cleaning fish tanks but, that was a huge cost of water. Not to mention the effects on the environment. This is a perfect set-up that I wouldnt mind being abusive to since the components are so cheap. secondly I wasnt aware that you could lower the boiling point that low. My aspirator must suck because I could only get it down 15-20 degrees. This is hugely useful for not only simple things like filtration but also distilling those pesky high boiling point compounds that like to decompose at high temps. Thanks Nurdrage and keep up the good work.

@31946mar

10 ай бұрын

Not sure where to put this comment but I need help. I rigged up a pump a little bigger than his with an identical appearing venturi and could only get down to -6 in Hg. Does this video ever come out and say what he got?

Color me impressed! Thank you for the video.

Another very nice video! Thanks

There is great power in potentiality isn't there? Very inspiring and great video as always.

A very useful video, thanks!

I love these type of videos!

@NurdRage

7 жыл бұрын

Me too!

@user-py9cy1sy9u

7 жыл бұрын

Me three

What a great video. so educational 😊😊

@NurdRage

7 жыл бұрын

Thanks!

@WhatWillHappenIf0

7 жыл бұрын

NurdRage Welcome :) Your videos are all educational. :)

Excellent video thanks .

great video learnt a lot thankyou!

Great video, very usefull information!

After a couple of tries, I got a 14 mm x 1.0 mm pitch die that perfectly fits the inlet an aspirator that appears identical. While waiting on it, I had an experience where another aspirator would do -7" Hg with < 6 mm separation from my fitting on the pump and -28" Hg with an 18" tube. Theory is that aspirators require laminar flow input and 50 pipe diameters are required to re-establish laminar flow after passing through a pump or past a 90 degree elbow. But, enough power and it does not much matter but at the edges, it can.

Thanks for your content.

Thank you very much I did not know this method and it was very good for me to concentrate sulfuric acid since I do not have an airtight container that can be heated greetings from Argentina

I found this very helpful.thanku.

This is very useful.

Thanks: I wondered about the relationship between pump water temp and vacuum, but never looked into it. Cheers, Mark ************************************

that was fantastic, thank you!

on ships this is called "ejector", used for distillation of sea water, to obtain fresh water with minimal use of heat (in fact the waste heat from the engine is used), wonderful Venturi effect

Thank you very much. I buy this system like yours for fractional distillation. Very cheap!

Seems a reasonably good setup for my vacuum distillation of essential oils,. Also to distill out alcohol from tinctures without rising too much the temperature and destroing essential oils.

Well i finally got around to testing this. I used pretty much exactly the same setup- the same cheap aspirator, the exact same water pump, some tubing and a square mop bucket as the reservoir. The results were pleasing. i was able to distill acetone at 18c. the flask was so cool it was even water condensate on the outside of it. my lab was a rather warm 29.8C in contrast. the reservoir water temp was not ice cold so it probably would be able to distill at a lower temperature still. The only thing i found was a need to have the aspirator positioned vertical unlike what you have here and the vacuum was quite strong too when i tested it for a vacuum filtration as well. Thankyou for showing this setup! i had my doubts but it really does work as well as you have demonstrated here and i see how useful this little device really is.

@vantablack9882

5 жыл бұрын

how long can this diaphragm water pump work ?

@nicolesomerstein6863

4 жыл бұрын

Hello! Did you use an aspirator like the one he shows here? Or did you use a lab grade aspirator? I am attempting this set up with a lab grade aspirator (also called a filter pump; a bit longer and all metal) and have not been able to pull a vacuum strong enough to boil my water solution.

@31946mar

10 ай бұрын

Same problem using $10 aspirator (Actually $26) and slightly more powerful pump but can only draw -6 in Hg.

Very helpful! Thx

Good info.

excellent thanks

Idd a great and relatively cheap tool to achieve vacuum. Good that you explain not to connect it to your faucet and thereby spill loads of water while polluting it. We used them in our lab till around the mid 90's, then they got banned. Now its all membrane pumps, good ones are pricey though.

Freezing bags of water. Thank you for that tidbit! That will be handy

@karolus28

2 жыл бұрын

just don't try to freeze 1L of warm water or your freezer will melt, I learned it the hard way

I can just feel my gear acquisition syndrome kicking in!😉

Hi! You have taught me a lot through your videos NurdRage. Thanks a lot! The pump you're using, does it withstand continuous work during all the distillation run? Or does it need to be stopped periodically to cool or prevent wear on the diaphragm? I suppose using ice water helps it to run cooler but, does it need break intervals? Thank you and have a nice day!

this vid' is exactly what i needed. esp' the part about using a tub & pump to re-circulate the water. my need is to reduce the amount of water in an acidic plant extraction. as well as other distillations of solvents to recover the extra solvent beyond what was needed to dissolve the cd's of interest. i've known of you for several years now. and held off being a patron for a lack of see you using a spectrophotometer to monitor an experiments progress. as well as to show us how one can be used to determine distribution-coefficients of liq-liq extractions. and now , never mind all that, you deserve my support anyway. the next step ... reach for my wallet

+Nurdrage This is (according to auctions I have found) available in aluminum, copper, and stainless steel, all for around $10. My knee-jerk reaction is to get stainless, but I've learned watching your videos that metals don't always behave like I expect, so I wonder which is really the best choice. I also wonder if there is any benefit to getting all three and using different metals depending on what it will be used for, or if it would just be better to get three of the same kind (which ever that would be) so I have replacements when they corrode.

I've used venturi vacuum generators like this all my life for vacuum bagging composites to degassing solid propellants, vacuum molding, etc. Vacuum Forming tip; use a portable air tank for inflating tires to act as a vacuum surge tank for the initial surge to pull the vacuform material into the mold then the venturi will pull it the rest of the way into the mold. Works amazingly well for doing polycarbonate and PVC molding in the garage. :-)

@IvorMektin1701

7 жыл бұрын

Thanks for the tips!

@NurdRage

7 жыл бұрын

yeah, it's so simple yet so effective. Since a machine shop almost always has a source of compressed air, the venturi pump is an extremely cost effective moderate vacuum system.

@StreuB1

7 жыл бұрын

Indeed. Actually, the venturi generators that McMaster Carr sells generate huge amounts of vacuum (thought with air as the medium). During some destructive failure mode testing I did back in 2007. I was able to collapse a stainless steel case made of 3mm material measuring 400mmWx500mmHx1000mmL with one of those generators. Blew my mind.

@NurdRage

7 жыл бұрын

Did you actually measure the vacuum pressure? Because even moderate pressure can bend steel. What's doing the work is the surface area of the steel since pressure is a "per unit area" effect. Ultra high vacuum and moderate vacuum actually has very little difference in terms of mechanical effects since the force applied per unit area isn't very different. But ultra high vacuum is necessary for physics work because it's the molecules themselves that are affecting the results rather the physical forces they are applying. Hooking up a particle physics grade ion pump and a water based aspirator pump to a vacuum forming machine would show little if any noticeable difference. But hook those up to a mass spectrometer and the spectrometer would likely arc and destroy itself on the aspirator pump.

very interesting

Oh my god that was a perfect video

Thanks for the great video! I want to use this cheap vacuum set-up for ethanol, and it seems perfect for that, but I want to be able to distill at a temperature of my choosing (between say 35 - 50C with a rotary evaporator). So my question is: Can you vary the pump speed to give a certain vacuum, or do you always have to use the ultimate vacuum strength, (which is what you seem to do in the video)?

The reason those 12v diaphragm pumps seem amazing is a brush type 10,000 rpm universal motor. It will shoot flames and billow smoke when the commuter wear gets bad. They will still run doing that though! I got about 10-20 hours before mine went. I tried powering one with a 3,000 rpm ac motor but that speed wasn't enough to do anything. Another possibility if you hate universal motors like me is an ac centrifugal sump pump. They don't have the pressure of positive displacement but you can daisy chain them, the outlet of the first plumbed to the inlet of the 2nd, etc.. The first stage nearly doubles pressure and you can add multiple pumps.

I love your channel

Had these in our lab in highschool 35 years ago. In fact im here to get one of these. And to hook it up to my hose.

I probably wont need this at any point in my life, but knowing how to create a vacuum using cheap parts may come in handy.

Maybe you should construct your outlet so that water can go out straightly and not through whole tubing, as going through the tubes requires additional effort so it may reduce your vacuum

Very neat (and cheap) solution, I didn't thought such a little water pump could handle a aspirator. To the cheap china rotary pumps: Yes they corrode extremely easily, but for the price of 50 bucks they are quite OK. Used one for many years, even Trichloracetic acid got in it an one point and the corrosion stopped the pump. After a little cleaning the pump was running again... (of course vacuum was not as good as stated, but for chemistry use it was OK with about 1-5mbar even after abusing )

Nice video :)

very interesting this might be a easy way to create the vacuum for my water based chiller project. I might end up machine my own instead of buying one but.

You could also direct the waterflow from the pump through your destiller first, in order to save some more water :) Also you could add icecubes to the mix to keep it very cold! EDIT: Oh, seams like you did exactly that :)

@NurdRage

7 жыл бұрын

I actually had two separate water circuits. As said the video i strongly recommend against pumping the contaminated through your condenser.

i will probably never do this but i still enjoy watching

what you made is a scrubber. In the plant i work at it works using the same principle. It uses a venturi and caustic solution that pumps through the venturi. It generates just enough vacumm for all the reactor vents in the plant to allow gases to route to the scrubber.

@NurdRage

7 жыл бұрын

It can certainly be used for scrubbing. It's a very old technology and i think even the greeks had it thousands of years ago. In this context it's an aspirator vacuum pump.

@screenflicker1

7 жыл бұрын

Thanks for the response!

I've just find out your same ProPump on Ebay,as soon as I can manage to get a glass venturi pump I'll use your same setup;if I can manage to make the device a bit more smaller for save space I'll upload a demonstration :-)

This is a great tool for the home chemist. Ultimately a refrigeration vac pump is best, they can pull to 500 microns as is standard for system evacuation, they are also acid resistant since refrigerants tend to produce acids.

@pazgomenskii5310

Жыл бұрын

Please sir, what Hp (horsepower) refrigeration vacuum pump are you recommending here and how are they compared to A/C vac pump in-terms of power & chemical resistance?

im getting hooked!

Very nice work. I always used a refridgerator compressor as cheap vacuum pump in the past, I had one that could go down to 30 mmHg and that baby took solvent and corrosive vapours for years before it finally broke down. A fan on it was sufficient cooling so it could run relatively stable for 12 hours. It was free from a junkyard. I must admit that I've had others too that were not nearly that quality. You can also put two in series for a higher vacuum (or in parallel if you need a high flow rate, as they don't perform well there). I didn't use aspirators because of the waste of tap water, but I have to say your system is quite nifty, I like it very much. EDIT: I just tested an old fridge compressor in my garage and it measured +- 60 mmHg. I guess I was lucky with my late baby child (may she rest in peace) and there is considerable variation in vacuum strength in refridgeration compressors. This one came from a cheap fridge, maybe the ones from combo fridge/freezers or those big ass American fridges or store-type deep freezers are the ones to look out for here.

@NurdRage After seeing this video I'm curious about experimenting with different fluids at cooled temperatures to see what works the best. Some dry ice will get acetone pretty cold, but would it be safe with that pump, or is there a special pump that would be needed to circulate acetone?

@nurdrage dumb question, but is it ok to heat the system to increase the vapour pressure in order to push the stuck water through? Also you said nothing about how to control the vaccum within this system. Turning the vaccum off? Bleeding the system? I would appreciate any help/response.

Nice video. Do you know how much faster water will evaporate if: 1: You leave one jar of 10 cm of water in atmospheric pressure at 10 degrees centigrade 2: You leave one jar of 10 cm of water in vacuum with your setum (aspirator pump running water at 10 degrees centigrade) at 10 degrees centigrade?

Have you ever worked with mixtures of anhydrous transition metal chlorides? I'm trying to find more detailed information about their electrochemical/redox reactions with each other.

Good day. Vacuum pump aspirations (ie hopes and dreams) have, so far, lead to failure and its keeping me from getting started on any project! To keep things straightforward, could any and all readers suggest precise Brand, Make, Model info OR specific operational statistics (specs) that they currently are using (and functions well)? Frustration levels are hitting the ceiling! And bank balances the basement!

Can you please tell us where you purchased a $6 nylon diaphragm pump? I looked through your previous videos and could not find reference to it.

One more thing. Do you know anything about Al/Ga reduction reactions?If so, Could you make a video on Aluminum/Gallium reductions. I just recently learned about them and would love to know more and see how well they work. That would save so many hazards over the Al/Hg methods and, save a ton of money and accessibility headaches over the LiAlH4/NaBH4 methods. Thanks!

Very similar to what is often used for embalming

Love your video. I'm building a vacuum pump like yours. How much sodium hydroxide & h2O ratio do you use?

+NurdRage can u explain a bit on why the water is getting collected at the adapter? is the water going to the aspirator pump?

Vacuum pump oil is pretty cheap by the gallon if purchased at stores selling farm products. They sell in 1 gal increments. Not great for high vacuum purposes, but if you need to change the oil frequently like me due to contamination, it is great.

Could you recommend a solid method for making non-alcoholic beer? I've tried the heating process to no avail. I'm now looking into vacuum distillation and a semipermeable membrane to separate two fractions from alcoholic beer. Thanks!

What adapter is used on the pump to connect the threadings of the aspirator to the pump??

Hello old friend , do you have a link to this device ? i think i can use this as a low pressure boiler feed pump

@NurdRage

5 жыл бұрын

The particular ebay seller that sold this one to me is no longer around. But there are many other sellers. Type in "aspirator pump" into ebay or amazon and you'll get dozens and dozens of sellers. they're very cheap. Some are a little shoddy though in that they might have cracks or bad threads so they leak air/vacuum. You might have to fiddle with the o-rings to get them to seal properly.

Nifty. Seen such setups before. Some that had their aspirators made from HD PP? Something like that. I think that you are right about buying the parts online, Amazon and eBay? Thanks for the demo.

I bought one after seeing this video years ago. Its never worked great. It sits in my random accessories bin years later. Ran across this video today. I might have to try it out again

Is this pump suitable for running the water through cooler and possibly for vacuum filtration/dessication?

Would this be a good option to use w/ creating vacuum in a soxhlet?

We use that type of vacuum pump where I work, we fill gallon and half gallon bottles with milk and we get foam in the large stainless bowl so we use it to suck the foam off

Hi Nurd, i have a very important question. I cannot find the aspirator valve online for cheap, do you think i could use a small venturi injector ? Like the ones used for spreading fertiliser ? Thank you.

Hi, have you ever considered for even lower pressure to use a salt water bath with plenty of ice at below 0C. Anyway thanks for the vids

Hi Nurdrage, maybe if you remove the one way valve you can gain 20-30 torrs. Just make sure to disconnect the vacuum tube prior to disengage the pump. ciao

Nurd Rage I have 2 questions can gallium be used to break other metals like iron and silver and can you also show the substitution reaction of alkanes with chlorine by using UV light thanks in advance and this is a good video

Love your video and information. Would a 130psi pump vs 100psi be more efficient doing vacuum filteration?

@boreichenbach4267

Жыл бұрын

Agh, I think one can consistantly say the higher psi pump would be better for vacuum filtration, esp. filtering through a medium such as diatomic earth. Just because it will have a higher flow rate! Answered that on. logic, but I am a medicinal biopsychopharmacologist! 😀

Thank you for the video and for all of your help so far! I promise this is my last question for you. Is the barometric pressure where you live relatively low? Where I live, the pressure is at 30.24 in hg. I am thinking that this is why the set-up isn't working for me.

@NurdRage

4 жыл бұрын

Not really, it's very close to sea-level pressure where i am.

So. A question. If you aren't after vacuum distilling anything special, more like drying stuff out or making distilled water or lifting potable water out of seawater, can you dispense with the water jacket, or is it still needed?

is this a reccomended method for dustilling sulfuric and nitric acids?

Reminds me of our air supplier in our aquarium

Does the boiling points of other liquids change proportional to water or does other params like molar mass, density play a role? For e.g. at usual air pressure, water 100°C and ethanol 78°C. At vaccum 70mbar water 39°C and ethanol at 30°C (percentage) or 17°C (linear)?

@nurdrage How would an ionic liquid serve to lower the pressure, more specifically could there be a possibility of reaching a near perfect vacuum? The vapor pressure is significantly lower than every other liquid. I know in practice it is a really expensive "solution" but I think the novelty of it would be worth the cost.

Excellent video :) heh i have nearly the same pressure pump and it works like a treat

@nicolesomerstein6863

4 жыл бұрын

Hello! Do you happen to have the link for the aspirator you are using? The one I bought is not pulling a vacuum near necessary for my solution to boil.

@31946mar

10 ай бұрын

Same here for my two aspirators

@31946mar

9 ай бұрын

Finally got the aspirator to work (-27.8 in Hg) with direct connect to household (nominal 65 psi) water. Pump with 70 W vs this 60 W only gets about -7 in. Hg.

at 4.55 where you talk about limiting of the vacuum , it is unlikely but will a more powerful water pump help avoid this problem?

@mdimarco87

7 жыл бұрын

I think so too, unless the low pressure causes all the water in the stream to instantly flash boil I think it would help. But it would probably take a much more expensive pump to get the same results as some ice.

@acrakatau4365

7 жыл бұрын

It wouldn't help to get a lower pressure. With a more powerful pump you can evacuate faster, but not to a lower pressure. In short: As he stated, the water in the aspirator begins to boil, so no more air can get sucked in. That's the point where the end vacuum is reached with the pressure equals the vapor pressure of the liquid.

@NurdRage

7 жыл бұрын

+I AM Diablo Nope, if you listen again at 4:55 i say "what limits the ultimate vacuum in this case isn't the design of the system but the working fluid." A greater pump will NOT avoid this problem. You could put the entire hoover dam behind you, and you'll never get below the vapor pressure of the working fluid.

Is it possible to do this type of vacuum distillation with a soxhlet extarctor? If so is there any spacial thing to be carful of or other things to keep in mind? (I understand that things under pressure could be more dangerous)

I'm wondering if it's possible to build individual fume hoods built on a similar concept.

Will you use this for the pyrimethamine synthesis?

Plase, give me a link to your cheap suppliers of the 2 items - the pump & the adapeter! Thanks in advance!!