I do not fully understand the reason for storing solvents which contain a certain percentage of HCl gas.
I would never do it, because of the unpredictable chemical reactions over time with the solvent.
Toluene seems like a good alternative, and perhaps DCM, to answer your initial question, but for just a few hours, however I've stored them at times for much longer periods. Did not have the time back then to compare yields from fresh solvents to yields when using in forced situations a stored solvent/HCl solution.
Fresh Acetone, Toluene and DCM (all low hygroscopic), mixed with fresh freebase MDMA, at a ratio of minimal 8:1, and then gassed gave always highests yields, as the first massive crystal collection.
Gas the collected filtered-out solvent again and filter off a second small portion of crystals.
Do not forget to gas the combined subsequent acetone washes of all your crystals again, to collect a third very small portion of crystals.
Freebase will always adhere to and inside the crystal structures, thus the third wash is more a soaking of your crystals for a night, then filtering.
To speed up things, do not filter but use a centrifuge to precipitate the crystals in 5 minutes.
It also decreases mechanical losses. Just decant the solvent or pump it off.
DCM is a special to me, in most cases it's better to gas inside your 22 liters, and evaporate all the DCM at reduced pressure. Then add acetone to the dry, brownish crystal mass, and decant the sludge, filter, while pouring acetone over the crystal mass in your buchners, resulting in snow white crystals.
This way you use way less acetone, and acetone is exactly the smell you don't wanna bother your neighbours with. DCM will not smell this way, because it is condensed in your distillation setup, and collected in a 22 liter receiving flask.
Chemical engineers will use 150 liter SS tanks to do this.
McGuivers will do all the processes in a 1500 liter milktank, so included the gassing and washings, it's that warm fuzzy feeling you get when shuffling 5 kilo crystals per swing from the bottom of your milktank, which you'll never forget. LT/
WISDOMwillWIN