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DFliyerz
Hazard to Others
Posts: 241
Registered: 22-12-2014
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Mood: No Mood
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So, so jealous! It's like watching porn for a chemist. But now I know what I want my work space to look like, once I move out in a few years and get
my own place.
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aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
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The absorbent towel is behind you next to the door 
Finally i got the front doors/windows done.
It is basically a sash window, with each pane sliding independently.
 
Just the lead counter-weights to melt & cast and it's basically done.
The photo below shows the proper way to calculate the precise required mass of the lead counter-weights.
(fold some bits of lead pipe in half and hang it on the wire).
With the front closed, it is apparent that the extractor fan i bought is crap. The cheaper old one was better.
Definitely going to replace that, which will be easy as the fan unit was designed to make it easily replaceable 
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
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Mood: Chemistry: the subtle science.
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What do you mean here? With the front closed is there any way for air to enter the hood?
How wide is your hood?
The single most important condition for a successful synthesis is good mixing - Nicodem
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aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
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The front control-panel bit is the 'airfoil' part, although not really designed as such, just built in that general shape.
The front door/window is in no way air-tight, allowing air in throught the bottom part (at least) at all times.
The hood is 1040mm wide by 860 high by 600 deep.
The idea with the baffle & ducting was that air would be sucked strongly at the top and bottom of the back of the hood, and it is not.
A puff of cigarette smoke under the bottom of the front door just hangs about, then gradually makes it's way to the exit ...
[Edited on 20-5-2016 by aga]
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aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
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Been a long time since i melted and poured Pb - lotsa fun !
The mould for the counterweights was just some slightly damp sand in a big pan, with a silicone sealant tube as the 'form'.
All i need is a rough hole in the middle, so a bundle of welding rods wrapped in Al foil serve well. As they are individual sticks, it's much easier
to pull them out one-by-one than it is to pull 1 big metal bar out of there.
Just pour in the lead ...
... and tadaaaa ! A Lead counterweight for my fume hood sash door/window thing.
They are a bit too wide, and catch on other things, so i'll melt them all down again tomorrow and make thinner, longer ones.
Woohoo !
Edit:
One-finger to the sash door/window.whatever it's called (and there's no lube !) :
Attachment: action.wmv (810kB)
This file has been downloaded 341 times
[Edited on 20-5-2016 by aga]
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aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
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Happiness
Re-melted/cast thinner counterweights and they work really well : even better now they have some grease-lube.
The extractor actually does quite well with light fume production when the doors are shut (still a gap at the bottom).
First thing was to try distilling the 250ml bottle labelled 'Failed EtOH/Cl2' from the first step in the TCA attempt a good few months ago.
  
I did have a sense of being slightly drunk and some euphoriah, although that was very likely due to beer and happiness rather than chloral hydrate
fumes.
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glymes
Hazard to Self
Posts: 53
Registered: 16-5-2016
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Mood: Fiddly
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Oh wow.
By the way, did you not notice the way you mentioned lubricant, an absorbent towel and pornography all on the same page? 
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aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
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Quote: Originally posted by glymes  | Oh wow.
By the way, did you not notice the way you mentioned lubricant, an absorbent towel and pornography all on the same page? |
I did not notice.
Surprised you used no LaTex in that comment
[Edited on 21-5-2016 by aga]
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glymes
Hazard to Self
Posts: 53
Registered: 16-5-2016
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Mood: Fiddly
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Oh dear.
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aga
Forum Drunkard
Posts: 7030
Registered: 25-3-2014
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Sadness
Distilled the failed EtOH chlorination stuff twice today.
Each time the B.P. of the fractions are miles away from chloral hydrate etc.
Messed for a while by adding conc sulphuric to it, then gave it up as a bad job.
Then properly disposed of it all (set fire to it).
Better to start again with Known reagents and keep the water out.
[Edited on 22-5-2016 by aga]
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