Ask Erowid

Ask a Question

Find an answer:

View By Category

Search Ask Erowid
Search Vaults

Enter a keyword in the search field above to look up a question or answer on a specific topic.

Off-Site Psychoactive Question Resources
  Ask Dr Shulgin

Resources at Erowid
  Plants & Drugs
  Freedom & Law
  Mind & Spirit
  Arts & Sciences
  Library / Bookstore
  What's New
  About Erowid
Can freebase cocaine be converted back to powder?
Q: Is it possible to turn the freebase form of cocaine (like crack or pure freebase) back into the salt (powder) form?

A: Yes.

This can be done by first dissolving freebase cocaine in as little solvent as possible. Solvents like ether (diethyl ether, or preferably, *t*-butylmethyl ether) or light naphtha1 may be used.

After dissolving the cocaine into the solvent, isopropyl alcohol that has been saturated with hydrochloric acid is slowly added. The isopropyl alcohol used should be at least 90% pure (10% water), and it is even better to use isopropyl that has less water. (As "rubbing alcohol", 99% isopropyl, that contains only 1% water, is available in many areas.)

When these mix, the cocaine becomes protonated (converted to salt form) and will precipitate out of the solvent. Refrigerating for a few hours helps more of the cocaine fall out of solution. When no more precipitation forms, the reaction is complete.

Finally, the precipitate (cocaine salt) is then filtered and "washed"2 to remove any remaining solvent or solvent impurities.

Notes #
  1. Naphtha can be checked for impurities by placing some on a sheet and allowing it to dry. When itís completely evaporated there should be very little residue. The purity of the naphtha is less important if the cocaine salt is washed properly after recovery from solution.
  2. "Washing" a material means that it is quickly rinsed, often using clean solvent of the same composition as that with which the material was precipitated out of solution. With regard to cocaine in its HCl salt form, acetone is also commonly used as a wash. Solvents must be evaporated and removed completely from any substance that will be used by humans or animals as the solvents themselves can be poisonous.

Asked By : bill
Answered By : Blacklight
Edited By : earth, jon
Published Date : 1 / 12 / 2011
Last Edited Date : 1 / 13 / 2011
Question ID : 3151

Categories: [ Chemistry ] [ Cocaine ]

Ask Erowid v1.7 - Jul, 2005

(content and html © the Vaults of Erowid. Please ask permission before publicly reproducing.)