Sciencemadness Discussion Board

Filter Reactor - The 'Easy' Way to Recrystallize Solids?

LuckyWinner - 17-3-2021 at 14:20

here is an example of a filter-reactor
https://chemglass.com/1l-process-filter-reactors-cylindrical...
Quote:

Our unjacketed filter reactors can be used for single or multi-step reactions and filtrations in the same vessel, and large scale peptide synthesis. Filter base eliminates material transfers and significantly reducing losses. Complete reactor system on our ChemRxnHub stand. Supplied with the components listed in the link below. 150°C Max. Temp. Limit for Filter Base.

Please Note: Filter Reactors are for Vacuum/Gravity Filtration Use Only



I got a good deal for a used small 250ml jacketed reactor with a PTFE Filter, 30 Micron.


for example,

-jacketed reactor with a PTFE Filter contains your
solid product which is dissolved inside a solvent.

-you distill off the solvent and you are left with the crystals inside and ontop of the PTFE filter.

-add hot fresh re-crystallization solvent under stirring,
then cool down the solvent by slowly down regulating the jacketed thermo-fluid by a PID controller over several hours.

-once solid is precipitated out simply drain solvent through the bottom valve.
solids will be contained in the PTFE filter.

-solid can be redissolved in clean solvent and pumped out.


this will work as described or are there unforeseen tragedies?

Panache - 24-3-2021 at 17:04

Ha ha ha....yes it will work exactly like that...with a few huge exceptions!
It would be quicker to list the few circumstances in which it would be practical...if the system you are working on is largely well understood it may be more practical. Note they only allow for vac or gravity. This is the shit bit because what they are excluding is schenk setups and these are/would be more helped by such a device.
How much did you pay?

Panache - 24-3-2021 at 17:07

Wait i just realised itsz chemglass reactor. These are as practical as something this fixedcan be...

LuckyWinner - 24-3-2021 at 17:28

i did not buy anything yet.
just asking if this would work.

I do have a low vacuum line for filtration and other lines to pump the liquids.

is this a good way to recrystallize solids or not really?

Panache - 27-3-2021 at 03:52

Yes in principle...theres not enough information to speak in anything other than generalities. Just be aware (which im sure you are) that in most instances the mother liqor contains compound. If your chemical expensive or difficult then always check it.

LuckyWinner - 13-4-2021 at 09:30

anyone here actually does this to recrystallize solids?