WFOnitroNerd
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I bought a lab glassware lot and id like Thoughts on the condensers that are jacketed over the female joint portion
Is the jacket over the female portion of the condenser good or bad I ask cause I see they don't really make a lot of them Like this now and my thought
other than cost of making it like that is the thicker glass being cooled same rate as thinner glass could be reason for structure failure just my
ìnital thought without having done any research cause I know things like this books only say so much it's the experience that tells it all......good
or bad with the amount I paid for all the condensers i received ill make money and have a few choicè pieces LMK if anyone would like to see all the
glassware
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Sulaiman
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No system to fasten one piece to the next, (eg Keck clips, springs, threads etc.)
otherwise quite interesting.
CAUTION : Hobby Chemist, not Professional or even Amateur
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jackchem2001
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I can't think why that would be good but I also can't think why it would be bad except for what Sulaiman already pointed out (no easy clamping
position). Maybe it might help with joints seizing? Or if it stays cool around the joint then your joint grease is less likely to flow out (viscosity
gets lower with temperature).
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BromicAcid
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What do the rest of the condensers look like? I've had takeoffs that connect to distillation heads that are jacketed like that so that highly
volatile materials will be remain condensed after they come out of the distillation head. As for clamping, throw a rubber band around the nipple and
over your glassware.
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jackchem2001
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You know while we are talking about clamping I would like to ask if it is safe to clamp every joint with plastic keck clamps or does it introduce an
overpressure risk? Currently I leave every joint unclamped and I always have unclamped stoppers. I have had situations where I added something too
fast and the gas evolved popped out an unclamped stopper. This is functioning as intended and releases the pressure before explosion.
However, for an admittedly overgreased stopper the release gauge pressure is probably just a bit beyond 10% of atm. This is really low and
occasionally my weak air pump blows a stopper out when there is clearly no explosion risk at this pressure.
I notice people on youtube clamp every single joint with plastic keck clamps but I wonder if this would prevent the release of pressure in time before
a glassware explosion. I am confident that metal keck clamps would have far too much friction and would be dangerous if every single joint was clamped
(the joints wouldn't blow out before an explosion). This is what I am talking about : https://youtu.be/Tm6neog6XVQ?t=269 I would leave that joint unclamped (and also have an unclamped stopper on the gas generation flask below the
addition funnel) but he clamps it.
[Edited on 6-11-2024 by jackchem2001]
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Sulaiman
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Not a problem because at least one Keck clip will get disintegrated by wet chlorine gas escaping through a leaky joint. 
But yes, I agree that there should be at least one un-clamped joint
CAUTION : Hobby Chemist, not Professional or even Amateur
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jackchem2001
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I noticed plastic clamps breaking too during Cl2 experiments but I thought it was due to sulfuric acid grease. They must be really sensitive to
chlorine if it's that since I did a multi-day chlorination experiment (chloral prep) in my bedroom and it was fine to sleep in there. Only a mild
odor, no irritation or anything like that
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WFOnitroNerd
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Here is a pic of a small condenser that has only a male end but the coolant is able to go to the tip of the male joint. I'm not sure if it is a
production piece from pyrex or if it is just a salvaged broken condenser that has had a barb put on and sealed by an experienced lampworker. I'm
thinking the latter because the condensers that have the big coolant jacket over the female joint are also like that ( coolant able to go to the tip
of the male joint). Also attached is a pic of all the glassware, that I bought in a single listing on eBay for brace yourself.....$120US .....even
though it was not what I was needing to get. i just could not pass it up. I figured that I could sell most of it. keep a few select pieces and have a
few more dollars than I originally to started with, to get that big azz RBF I need and mabey a few chems I want. Hopeful thinking
 
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Dr.Bob
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The item on the right is just a cooled stirrer shaft. The shaft can generate heat so they sometimes are cooled that way. It is not useful as a
condenser by itself, just a way to keep the shaft from heating up, still need to oil or grease it also. The hole should be 10 mm most likely.
That is a great haul of stuff or $120. Happy to swap a few things if there are items or chems that you want to swap condensers, Vigreuxs, or other
stuff for.
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WFOnitroNerd
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Dr.Bob i appreciate the offer very much I sent you a u2u and thanks for the Info on the cooled shaft its good to know
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thermochromic
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Quote: Originally posted by jackchem2001  | | I noticed plastic clamps breaking too during Cl2 experiments but I thought it was due to sulfuric acid grease. They must be really sensitive to
chlorine if it's that since I did a multi-day chlorination experiment (chloral prep) in my bedroom and it was fine to sleep in there. Only a mild
odor, no irritation or anything like that |
Scientific Equipment of Houston used to sell white PTFE keck clamps. I bought several a while back. Not sure if they still are available but they are
awesome.
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