IT al boils down to factors like the type of AL foil, this is different from country to country, by that i mean the type of AL foil . The type of OTC solvents, eventhough the same it can be diluted with "unknown" substances.

However, i have read that instead of using IPA, usage of Etoh should increase yield. I have tried this, based the reaction. added IPA to collect the Etoh also (miscible)
and i cannot tell surely if the yield was higher, but post-product really had lower potency, in comparison to IPA as started solvent for nitropropene.

I do agree that the foil available does differ. some of it Ive seen seems to come with a sort of waxy coating, that would most certainly impede any reactions. I'm waiting on trying Aluminium powder for yield comparisons. Kitchen foil most probably has adulterant elements too. I presume Tin is one of them.
As for alcohols my thinking still reckons that meoh is superior because of the lower BP. Is there any reason why etoh would be superior? Methanol certainly costs a fraction of price.

the "problem" for me is, the amphetamine sulphate is realy withe, after rxn.
But i will do some easy cleaning in future.

... what is the right temperatur for vakkum destiliation the freebase ?
thx

Base distills at about 110 degrees at aspirator vacuum of 30 mm Hg. Use an oil bath and stirring.

The info can be found on google as well as on this forum. 

@nodream

Thank you very much ! where do you find these information ?
best regards

Look here,  Vacuum distillation http://en.wikipedia.org/wiki/Vacuum_distillation for starters, and Vogel for in-depth info.

if you want a nomograph that is more computer friendly try this:

http://www.sigmaaldrich.com/sigma-aldrich/areas-of-interest/chemistry/solvents/learning-center/nomo-assets.html

Quote from: T-cowboy on September 28, 2012, 07:11:32 PM

Tip of the week:

When the orange like ipa is seperated (twice collect) pour in half amount of COLD anhydrous acetone, then drop by drop pour in sulphuric acid. this ensures nice white sulfate snowing in the flask, without re-x afterwards. filter this. dry this. PH 7-6 i think.

Did not work for me, had to distill the acetone away only then got nice snow-white A-sulfate.

My only explanation is that your acetone had some water, since it aparently dissolved the A.sulfate.? maybe.

if you want a nomograph that is more computer friendly try this:

http://www.sigmaaldrich.com/sigma-aldrich/areas-of-interest/chemistry/solvents/learning-center/nomo-assets.html

I've saved the flash .swf file, so you can use it offline, on any PC\Laptop with your web browser (Firefox) and Adobe Flash installed.