I want to know how I go about making cocaine pure.............turns out he got some cut with lidocaine,
Well buddy I'll be frank and tell you the truth, if you have to ask how to separate Lidocaine from Cocaine you wont be skilled enough to do it.
That said here's the link to
cocaine purification, the absolute final thread if you wish to read through it do so because the information in it is very educational with the odd inaccuracy here and there but for the most part that thread is recognized as the number one benchmark document regarding street cocaine purification in the world, its probably the most plagiarized peace on the internet .
RE:Lidocaine
Le Junk says things like "Chloroform DOES remove procaine and lidocaine" and that is just complete fiction in my opinion, the US Pharmacopoeia indexes totally contradict any indifference of solubility to chloroform if a salt (Hydrochloride) or not so I don't know where that came from.
If you happen to have some chloroform it can't harm giving it a go, but I would read the MSDS for the chemical first if I were you.
All fun aside there are some hard to get dangerous chemicals needed for removing adulterants from cocaine. You really need "diethyl ether" and "anydrous ethyl alcohol" both need a very professional understanding of storage and handling to prevent such things as the formation of explosive peroxides or the gathering of heavy vapors.
Without an understanding of rudimentary acid-base reactions I don't think you will understand this but Lidocaine has a lesser pka (8.01) then that of Cocaine (8.66) so theoretically the greater reaction to ammonia affecting the extent of dissociation in aqueous solution could make for an A/B extraction.
I don't think there is a simple answer to your question.