stoichiometric_steve
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Buchi Rotavapor R for sale (from Europe) with pump, vac controller, stand etc.!
I have a complete Buchi Rotavapor R for sale.
It includes:
-the motor (regularly serviced with grease, 220V version)
-the condenser (horizontal model)
-connector tube from flask to condenser (the part that one sticks in the motor piece, with 29/32 male taper joint)
-original Buchi stand with lifting mechanism handle
-a bath (suitable for temperatures up to 160°C, may be used with water/PEG/silicone oil)
-vacuum and water tubing
-a 1000ml collecting flask (ball joint KS35)
-a 1000ml distilling flask (29/32 taper joint)
-a KNF Neuberger N035 AN.18 single stage diaphragm pump (pulls ~80mmHg)
-a manual vacuum controller
-a Keck securing clip for the distilling flask
-a securing clamp for the collection flask
1250 EUR is the basis for negotiations. shipping goes extra, will be around 30-50 EUR for european destinations.
U2U me for offers!
i dont have pictures here right now, but the model looks like this one with a different bath.
this is the pump, but the dual stage model:
[Edited on 19-8-2008 by stoichiometric_steve]
[Edited on 19-8-2008 by stoichiometric_steve]
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Ozonelabs
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We are very interested. A Personal Message has been sent.
We look forward to a response.
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Ozonelabs
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/// Apologies, double post///
[Edited on 19-8-2008 by Ozonelabs]
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Sauron
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Normally the baths Buchi sold are just water baths and so top out at 100 C or so. In fact they are designed to be used at 60 C as Buchi teaches the
20-40-60 rukle.
Bath at 60 C
Coolant at 20 C
Adjust vacuum so sample bp is 40 C.
Running the bath hotter than 60 C is inefficient and wastes energy doe to evaporative losses of coolant.
Buchi made and makes oil baths to 160 C for their later models, but I have never encountered one for the original Model R. Certainly the heating
element and thermostat will be very different.
Such an oil bath is dangerous if used without a shield as the hot oil will splash off the rotating sample flask. This is a nuisance with 60 C water
but 160 C oil? A disaster!
The weak spot on all Buchis is the vacuum seal. Replace vacuum seals regularly. The rotating vapor duct wear an oval in them and after that they leak
too fast and can admit corrosive vapors into the mechanism.
When shipping that double coil condenser, you must place plastic or carboard strips between the coils, otherwise they can break easily. It's happeed
to me.
Sic gorgeamus a los subjectatus nunc.
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stoichiometric_steve
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| Quote: | Originally posted by Sauron
The weak spot on all Buchis is the vacuum seal. |
Keep it well greased and it will last a long time. This model is equipped with a Kalrez seal which lasts for 6 months already without the slightest
sign of leaking.
The bath i'm selling is not a Buchi make, it is from Daglef Patz. In some situations, it is nice to have a bath that goes higher than 100°C, although
it is rarely necessary.
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stateofhack
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Looks wonderful!
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Sauron
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The bath in the photo is a Buchi, integrated into the Buchi stand, I know because I have one of the identical Model R with same stand and bath (US
voltage) sitting here. At one point I owned 16 Buchis. Now I am down to 4-5 including a 20 L industrial Model 152, and the R110 I use routinely. I
have a pair of RE-120 motor heads, a few spare R/RE stands, several R motor heads for spare parts.
I agree that an oil bath can be nicely useful, if you are working with high boiling solvents that are difficult to strip at 60 C. So, does the
non-Buchi bath have a shield against spatter of hot oil? I think your buyer will be happier if you can picture the actual equipment you are selling
rather than something clipped out of an auction ad.
Sic gorgeamus a los subjectatus nunc.
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stateofhack
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| Quote: | Originally posted by Sauron
The bath in the photo is a Buchi, integrated into the Buchi stand, I know because I have one of the identical Model R with same stand and bath (US
voltage) sitting here. At one point I owned 16 Buchis. Now I am down to 4-5 including a 20 L industrial Model 152, and the R110 I use routinely. I
have a pair of RE-120 motor heads, a few spare R/RE stands, several R motor heads for spare parts.
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Could we have a picture of that, its sounds sweet 
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stoichiometric_steve
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| Quote: | | Originally posted by SauronAt one point I owned 16 Buchis. |
I think Shulgin owns ONE rotavap 
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Sauron
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Ah but as far as I know, Sasha does not manufacture herbal liqueurs. Which is why I had all those Buchis.
When I got out of that project I sold off all but one benchtop model, gave another to my ex-partner in New Orleans who promptly lost it in Katrina,
and also kept my 20 L industrial model, as well as bits and pieces for several more that were not really worth selling off.
All of these were bought second hand, and disposed of in same places (LabX and eBay).
I did buy some Buchi glassware new, at shocking prices. Buchi is rapacious.
Sic gorgeamus a los subjectatus nunc.
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Arrhenius
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| Quote: | Originally posted by Sauron
Coolant at 20 C
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Hmm.. I think you'll probably fowl up your pump pretty quick unless you cool your rotovap well. If you're serious enough to get a rotovap, it's
really worth it to get a circulating cooling bath that'll get you to -10C. I like to lower BP with vacuum, not by getting the waterbath really hot,
as I've run into decomposition problems, albeit mainly in quantitative work.
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Sauron
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I do use a recirculating chiller, it goes down to 0 C. However, the 20 C coolant rule is Buchi's not mine. Better argue with them instead.
I use a Buchi V-801 digital vacuum controller and either a KNF Neuberger PTFE pump or a Eyela dual recirculating aspirator pump depending on the job.
Such pumps do not foul.
And for low boiling solvents I switch condensers and use dry ice-acetone.
Sic gorgeamus a los subjectatus nunc.
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Arrhenius
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Yup, I love the Buchis with the controller and oil-less pump. Such a model is not listed for sale here (I have the same one at home! oldie but a
goodie). Ahh.. I forgot about dry ice cold fingers  .. those are nice too.. never
worked in a lab with one except academia. Never heard of this 20C rule.. strange.
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Sauron
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Obviously the Dewar condenser option is only available in a vertical setup with a distributor head, on a type RE motor, or else when condenser has
flange for R type head built in.
I have the distributor head, and vertical double coil condenser is original Buchi. The Dewar condenser I had my local glassblower make, it has a 29/42
taper at bottom so I just interpose an adapter (also local) between it and the 45/40 joint at top of distributor.
Vacuum takeoff is at top.
The big 20 L model has a giant 3 coil descending condenser (type E glass) and inverted U tube, large trap and connection to distributor head. This
setup is for solvents that foam and bump like toluene. There's a provision for adding a second 3-coil condenser inline (parallel) if needed. Not
cxheap though!
I paid $6000 for that R-152 with glass and now if I had to replace just the glass it would cost more than that.
Sic gorgeamus a los subjectatus nunc.
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stoichiometric_steve
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| Quote: | Originally posted by Arrhenius
Yup, I love the Buchis with the controller and oil-less pump. Such a model is not listed for sale here (I have the same one at home! oldie but a
goodie) |
It IS for sale here. The pump is oil-less (as the name "diaphragm pump" implies) and from KNF Neuberger.
The vac controller is a manual device consisting of a needle valve combined with a manometer, which is much easier to handle and much harder to fuck
up than an electronic device.
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stoichiometric_steve
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look, guys - if someone is truly interested and thinks 1250 EUR is a bit much, U2U me with a price that would be acceptable for you and we'll see.
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DNA
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This is from the buchi website, does anyone know why to add borax to distilled water?
| Quote: | Heating Media
Which medium can be used in the heating bath?
Tap water is the most common used medium. When using distilled water, 0.5 g of borax should be added. |
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bfesser
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Perhaps to prevent algae growth?
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Klute
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If any french chemists out there are interested in a old but intact buchi rotavap, please contact me! I have already bought one from the seller, a
very kind and passionated person, at a incredibly low price... Here is a picture:
I don't think shipment in possible, the seller doesn't want to take the risk, but considering the price a quick rid during a weekend would really be
worth it. I live in the south of France; PM me if interested!
\"You can battle with a demon, you can embrace a demon; what the hell can you do with a fucking spiritual computer?\"
-Alice Parr
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haristown
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hi,i have a Buchi Rotavapor-R for sale xomes with the glassware
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Pseudomonia
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Oh thats a beautiful bit of kit, I loved using one when I was doing my practical work for my dissertation. If I had the money I would buy it!
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anotheronebitesthedust
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Wilmad has them for $1800. wilmad-labglass.com/group/3082
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