That's probably your best bet to be honest, it's far easier and cheaper to adjust the chemistry than the glassware. You'll have to calculate the flow
rate of the methanol from literature with the best yields, so if for example your slowest addition is 10mL in half an hour then using 20mL of 50% v/v
MeOH/THF would substitute nicely. Just make sure your reaction vessel has enough spare volume!
I guess you could also use an adsorbent if you're worried about the numbers, just a column with saturated and packed cotton wool that could also
contain something else like silica or alumina, connected under the funnel or on its own. That should also impede the flow of methanol, and a reservoir
can be built up on top (add the required amount after the saturated adsorbent no longer drips). This is just an idea and I have no practical
experience so it'll be best to play around and see what sort of flow reduction you can get out of it. |