Hello, I am having trouble with my 500 mL Büchner funnels. They seem to be filtering through far too slow, taking 25-30+ minutes to pull 1000mL, in comparison to how fast it looks in the videos on YouTube and from what I’ve read in others posts.
My last few attempts consisted of laying down a coffee filter over the fritted disc, then a whatman 2.5 micron filter paper. Then I would pour some ethanol in and turn on vacuum. Next, I would mix a slurry of either T5 or AC, then dump that into the funnel. The first few seconds after applying vacuum, the ethanol would come through pretty fast, but after ~30 seconds or so, it became agonizingly slow. I started to see ethanol evaporating underneath the fritted disc.
I would come back 10 minutes after filling the 500ml funnel with about ~300mL of AC/T5 slurry and it looked like it barely went down, and what was coming through came through in drips, it was constant drips but still drips. Very slow.
Is there something in my procedure I’m doing wrong? I know my vacuum is strong enough. Is it the two papers? I’m trying to get the AC/T5 out of my extract, would I just need to keep filtering in another Büchner (or maybe the same one) over a bed of Celite? I didn’t have any Celite in hand at this time, I was trying to follow the LostBiologist’s Tek, the part where he describes making the filter cakes.
Please help! Any info is much needed and greatly appreciated.