Is anyone experiencing a similar situation that an impenetrable gunk collects at the bottom of a distillation flask after short pathing and nothing seems to clean it?
We have tried everyting…
Acetone
Heptane
Denatured Alcohol
Easy Off Oven Cleaner
Dawn dishwashing fluid
We haven’t tried an ultrasonic cleaner yet but are considering it.
Get some alconox, make a hot solution, and soak. I’ve had it remove screenprinting from glassware too, powerful stuff.I usually rinse all glass with solvent, then place into a hot bath overnight. Scrub it with a bottle brush in the morning, any residue should come off fairly easly. Also works good for an ultrasonic cleaning solution.
Oxyclean & warm water followed by acetone - has always worked for me. This is of course for WF still bodies and WF components - and not SPD kits. Most WF have a Clean-In-Place.
I’ve often wondered if activated charcol under the heat and vaccum of a distalation actually keeps the absorbed components. Lately I have filtering it out prior. I started finding a trend on my data logger, distalations with the carbon generated slightly more vapor pressure. Just out of curiosity have you seen this too?
Anecdotally, you can add molecular sieve beads to the boiling flask and the beads will keep the clay from sticking to the flask until it cools down completely.
we just ran into this problem… our stir bar was completely stuck in the sludge/crust at bottom of boiling flask. hot ethanol and a two day soak cleaned the top half of flask, but didnt do anything for the sludge. warm acetone and a two day soak worked very well! stir bar is unstuck, and after a quick ethanol cleaning, we are back in business.