chemrox - 7-3-2008 at 16:23
None of my filter paper is fine enough to pull out the norite (activated charcoal) from my solutions. I need a spec to order some with. I can ask
the supplier but would rather hear from a member that has used the paper he recommends.
solo - 7-3-2008 at 16:31
Try using a fritter glass filter with 10-20 Micron porosity. ACE( D), Corning M(10-15), Kimble M(10-15)......solo
[Edited on 7-3-2008 by solo]
not_important - 7-3-2008 at 17:51
Whatman filter paper 4 is/was commonly used, very fast with retention down to the 20-25 um range.
You might try cleaning the norit, shifting the fines out using a very fine mesh screen. Obviously if half the carbon goes through the mesh this isn't
going to work for you, but my experience was that only 1/20 went through. I don't remember the exact mesh size, think it was US 325 or 400, which
means passing 45 or 37 um particles.
I saved the fines and used them along with unscreened charcoal when I was in no rush, just letting the charcoal settle out for hours or even days, and
decanting through a filter.
chemrox - 7-3-2008 at 20:09
I have a new (ebay) glass buchner with a 20-30 u frit. I'm thinking this is too porous.
The_Davster - 7-3-2008 at 20:18
I would use standard filter paper with a 3mm layer of celite, followed by another filter paper. The uppermost filter paper is not so much for
filtering, as it is to prevent the layer of celite from being disturbed when the solution is added.
bio2 - 7-3-2008 at 21:10
My favorite paper is S&S "SharkSkin". It's 12 micron retention, calendered, hardened, medium speed and acid resistant.
The texturing inhibits clogging and filtering
doesn't take forever like with some other similar porosity papers.
This stuff is so good you can rinse and dry it then use over
for many applications if so inclined. Try this with cotton
linter paper, lol.
Sharkskin is made from wood pulp cellulose and will not
pass Norit fines. Suitable for the buchner or fluted for gravity use.
Celite works OK but is a PITA. Frits are useful for some things yet can also be very difficult to clean.