I was wondering if any of you dabbled with the idea of fabricating a multi-buchner filter rack, that filtered out all liquid into a single, large
collection flask? I'm thinking this might be easier (and fun) than trying to source a 10L Buchner filter. blogfast25 - 3-4-2013 at 12:25
A Buechner of 18 cm ID (that's about 10 L) would require about 4 individual Buechners of 10 cm ID to get roughly the same filtration capacity. But
wether that would work out any cheaper bearing in mind the piping and other connecting bits, I'm not so sure. This apart from the inevitable
difficulties in planning and executing such a plan into a reliable filtration instrument...gutter_ca - 3-4-2013 at 12:48
Nice find! However, wouldn't half the fun be in engineering this solution Dr.Bob - 5-4-2013 at 13:05
If you are filtering many different small samples, there are devices for filtering in parallel, but most don't work that well (just one example of
problems: once one dries up and sucks air, the rest stop working). But it is almost always better to go to a single larger filter than do parallel
small filtrations. Even better is to filter through a course filter first, and then come back and filter more finely if needed, I often just filter
in bits, pour in some liquid until the Buchner is nearly full, then wait a while for it to filer halfway, then add more liquid. You can easily use a
small filter in a large filter flask to handle the liquid, but sometimes, you want to avoid using a large Buchner filter, especially if the material
is air sensitive, precious (it is hard to avoid losing some on the larger piece of filter paper), or you have small ones more readily available.
