I can't believe this.
You can do that reaction easily in a fucking 2L flask, IF YOU USE THICK AL. In a 12L flask you could make 500g runs without a problem. Use the fucking search engine. All your questions have been answered before. Repeatedly.
Here it is again
In a 5L two-necked flask equipped with an overhead stirrer and a reflux condenser with ice-water circulating through it was placed 2L MeOH. .5g HgCl2 was added and stirring commenced. Once the HgCl2 was completely dissolved, 120g of Al sheet, cut into 1/2" squares was added and stirred vigorously for 30min. 700g 40% Aq. MeNH2 followed by 534g of MDP2P were added in single portions, and the funnel was rinsed with 200mL of MeOH. The reaction was briefly heated to reflux temperature, the heat removed, and the resulting exothermic reaction cooled with a water bath(room temp water is OK, no ice needed) in order to maintain a light reflux(the reaction will run away otherwise). After approximately 1.5-2hrs, the exothermic reaction had subsided, the Al was mostly consumed, and TLC showed no ketone present in the rxn. The reaction can be worked up by any of the usual methods(repeated MeOH extractions of the sludge were used in this case). After A/B, distillation of the freebase, crystalization, and recrystalization from IPA, the yield of MDMA HCl(averaged over repeated runs) is approximately 450g, or 65%.
Also, just to give him his props, this procedure was based on Osmium's write-up on Rhodium's page and modified slightly over time.
Notes:
The Al was flashing from a major U.S. hardware store chain with an orange sign, sorry don't know the thickness. Watch out, as they sell another type of Al flashing that has a plastic coating and comes in the exact same packaging.
Ketone was simple distilled from modified performic, generally containing an unknown(5-15% ???) amount of unreacted isosafrole due to shitty H2O2.
40% MeNH2 was made starting from hexamine camping fuel in a procedure similar to that covered in Chromic's writeup and elsewhere on this site.