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smaerd
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[*] posted on 23-1-2013 at 09:23
An Affordable Modular Rotary Evaporator


Here's my first write-up it's far from complete but I could use some input. The original work done was being done here:
http://www.sciencemadness.org/talk/viewthread.php?tid=7128

Any suggestions on things to add or test please let me know.



Attachment: write up.doc (30kB)
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[Edited on 25-1-2013 by smaerd]

[Edited on 26-1-2013 by smaerd]

[Edited on 27-1-2013 by smaerd]




Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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smaerd
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[*] posted on 23-1-2013 at 09:54


Okay added some pictures here's the next one sorry for posting twice so fast.



[Edited on 23-1-2013 by smaerd]

Attachment: write up.doc (536kB)
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Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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smaerd
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[*] posted on 23-1-2013 at 16:23


Alright tidied up some of the grammar and redundancy. Put in a circuit diagram heres the latest.
edit - prices updated due to this thread
http://www.sciencemadness.org/talk/viewthread.php?tid=23149


Is this an acceptable idea for a publication submission?


[Edited on 25-1-2013 by smaerd]

Attachment: An Affordable Rotary Evaporator.doc (572kB)
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Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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smaerd
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[*] posted on 25-1-2013 at 09:30


Fixed some more errors added two time-trials, one more to go then a conclusion and it should be done. Just waiting for the ball bearing now.



[Edited on 25-1-2013 by smaerd]

Attachment: An Affordable Modular Rotary Evaporator.doc (592kB)
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Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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smaerd
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[*] posted on 26-1-2013 at 09:06


Alright, got the new bearing today and ran some trials! Results are in and two more pictures were taken. I was actually surprised the rotary evaporator beat out the vacuum distillation in all of the trials. Though it was close where there was more solvent per surface area.


This is it, The project is done. :)




[Edited on 26-1-2013 by smaerd]

Attachment: An Affordable Modular Rotary Evaporator.doc (815kB)
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Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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[*] posted on 26-1-2013 at 11:35


Very nice smaerd! This would be a nice project for those who like to build things.

The pictures didn't show for me.



[Edited on 26-1-2013 by Magpie]




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smaerd
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[*] posted on 26-1-2013 at 11:48


Thanks for letting me know I'll try and put them in another way :)
Does the PDF work?

[Edited on 26-1-2013 by smaerd]
re-uploaded to fix a spelling error



[Edited on 26-1-2013 by smaerd]

Attachment: An Affordable Modular Rotary Evaporator.pdf (521kB)
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Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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[*] posted on 26-1-2013 at 15:02


Yes the pdf and pictures are good. However, the electrical circuit diagram is unreadable due to the black background.



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smaerd
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[*] posted on 26-1-2013 at 15:52


Thanks for the input. Changed the circuit diagram to a lighter scheme and provided the tool that was used to make it in the references.

Attachment: An Affordable Modular Rotary Evaporator.pdf (526kB)
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"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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smaerd
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[*] posted on 27-1-2013 at 05:30


Added standard taper symbols to the joint sizes to be more official or whatever. Also fixed up some of the wording. I'm really bad a proof-reading and catching errors sorry... Anyways I think this is actually the last one, at least it's the one going on my web-site hehehe.

Attachment: An Affordable Modular Rotary Evaporator.pdf (527kB)
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Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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[*] posted on 27-1-2013 at 08:55


Quote: Originally posted by smaerd  
I think this is actually the last one
I would really recommend putting in dimensioned drawings for, at the very least, the two machined PTFE pieces. The lack of dimensioned drawings makes it harder for someone else to make use of this document as it is.

For example, in a photo you show a Keck clip. In order for that clip to work, the shaft has to be a particular diameter. Nowhere that I saw is there mention that this dimension is important. If someone already had 1-1/4" ID pillow blocks in their parts bin but no 1" ones, it would be more economical to use a 1-1/4" shaft. But the clip wouldn't work naively, you'd need to turn down the shaft for a bit to allow the clip to fit. So the dimensions of the taper matter, and it's the kind of thing drawings are for.

Another thing I was looking for was a picture of how this was set up with the distillation head in place, just to see how everything is arranged on the bench.

I would recommend taking a look at an issue of Home Shop Machinist or Machinist's Workshop (both by Village Press) for examples of how other people write project articles.
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smaerd
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[*] posted on 27-1-2013 at 09:03


The shaft is actually just 1" outer diameter for the keck clip. The keck clip doesn't do too much holding to be honest but I put it there for good measure I guess. I really appreciate the advice I will get to work on drawing up some more exact dimensions for the teflon attachments and reading some more about the article format. I'll also take a picture of how I had it set up, the reason why I did not was because the way I had it set up was very ... sloppy... The rotovap was simply placed onto a pile of wood and the glass attachment was clamped via a ring stand, stainless steel measuring cup for a water bath, etc. I'll work on making it's implementation more practical as well. Thanks for being critical.



Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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smaerd
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[*] posted on 27-1-2013 at 15:41


Okay I added two schematics I drew in LibreCad and added the information using Gimp image editing program. That was not fun. I'm not an engineer, I don't think I should have to adhere to a machinists type article base while sticking to a chemistry article. I thought about it, and my write-up includes way more information then many of the ACS published roto-vap designs do if not the majority of them. Several of them are maybe five paragraphs long with a picture, no tests done, no parts list for amateurs to look into let alone a redundant circuit diagram, or any explanation of what goes where or how to improvise a pulley, etc.

I'll wait to get enough money to buy a decent metal bowl/pot and a cheap hot-plate I can dedicate to this as well as build a stand for it so it is aesthetically appealing in use. For that final picture. Probably will be a month or so.

Anyway's here's the latest including the schematics of the teflon pieces.

Edit - I'm also not using a real roto-vap distillation head, I'm just using a 18/9 ball joint "blank"(http://www.safetyemporium.com/ILPI_Site/WebPagesUS/detail.ht...) with a bit of hose leading to a vacuum take-off(connected to a friedrich and a flask)

Attachment: An Affordable Modular Rotary Evaporator.pdf (569kB)
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[Edited on 27-1-2013 by smaerd]




Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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[*] posted on 28-2-2013 at 13:55


Okay finished product. Got the pictures up of the whole thing working.

Attachment: An Affordable Modular Rotary Evaporator.pdf (908kB)
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Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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smaerd
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[*] posted on 18-5-2013 at 05:22


The design is still holding up and working fine :). Hasn't been used a tremendous amount of times but has removed some liters of solvent now of several varieties. If I had to improve on this design here is what I would do and may very well do in the future. Have to comment and say how refreshing it is to want solvent to be evaporated under mild conditions and 10 minutes later be back at work.

I would use a servo motor to drive the rotor. I would have a thermostat going into the bath. I would use an arduino microcontroller to read out the bath temperature and an LCD to display this information as well as the RPM's. I figure it would cost another 60 dollars or so but would provide very similar functionality to a commercial rotary evaporator without too much more work.

[Edited on 18-5-2013 by smaerd]




Thank you for experimenting!


"The main resultant product would be a loss of a few fingers, maybe one eye and a lot blood.", Kristofvagyok
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[*] posted on 16-4-2014 at 17:55
A couple suggestions


Hi there,
Really, a very nice and ambitious project. On that theme, well done.
Now, a couple suggestions.

You've clearly identified the biggest challenge in this project, and that is the rotary vacuum joint. Unfortunately, it is the weakest part of your write up. I've looked through countless (as in...."too many to bother counting" :) ) pdf's that you've uploaded, and not one of them actually shows the connection to the distillation column with the clear tube. You come close, but no cigar!

So, I'd suggest the following. First, get a moderator to delete all but your final version. I suspect more than a few have download some, but not all of your files. The second point would be to include a photo of the link between the condenser assembly and the teflon ball joint as it attaches to the aluminum tube.

Finally, it would really add to your instructable if you actually diagrammed, in a linear fashion how all the parts fit together (including the vacuum line and the ground glass flask that goes into the water bath). Ok, if you really want to polish it up, replace that out of focus picture of the teflon/ground glass joint adapter! I think I see some o-rings....but I'm not sure ;)

Anyway, please don't take the above as anything but constructive criticism. I think you've accomplished a lot.

Oh, the following patent refers to the Yamato Scientific version of a Rotovap sealed joint. Very interesting. US005919339 dated July 6, 1999

My experiences with Rotovaps go back to my grad Chemistry days in the early 1980's. This may be a way more modern version. ;)

Nitrous
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[*] posted on 16-4-2014 at 19:49


I agree with Nitrous, The vacuum joint is not clearly defined at at, yet it is the most critical aspect of the design. It would be super nice if you posted a close-up picture if it!
That being said am really liking what you are doing here, I have been thinking about building a rotovap for some time and your document is definitely going to help!

Keep up the good work! :)




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