Methamphetamine after resolution, recrystallization problem

[@wangxiaolin777]

I dissolve the powder in dichloromethane, why is the dichloromethane not finished volatilizing is a crystal, volatilizing is finished, dry is a powder

 

[@wangxiaolin777]

Can someone tell me

 

[hacke8]

1. Dichloromethane has low solubility to methyl hydrochloride and cannot be completely dissolved.
2 The boiling point of dichloromethane is relatively low, and the evaporation is too fast to form large crystals, and will only appear as crystalline powders.
3. Clean the hydrochloride before recrystallization, (acetone, ether, dry and cold)
4. It is recommended to use - acetone: water, acetone: ethanol, acetone: methanol, ethanol: water, methanol: water, for recrystallization.
Water can slow down evaporation, acetone can reduce solubility, and alcohol can form better crystals.

 

[@wangxiaolin777]

Teacher, my hydrochloride is clean. I extracted it by petroleum ether and breathed it into hydrogen chloride gas, then dried it. Is pure ethanol OK? Or can you tell us the procedure

 

[G.Patton]

There is an icon of video tutorial with detailed write up on THE MAIN PAGE OF THIS WEBSITE.

 

[Bmth]

Setelah selesai dengan Sintesis I2 & Fosfor Merah, Apakah kita harus melakukan rute ini https://bbgate.com/threads/methamphetamine-isomers-separation-by-tartaric-acid.9690/
Then the crystallization process?

 

[G.Patton]

It's up to you. If you need crystalline form of meth.

 

[G.Patton]

Because you didn't do it correctly. You just add the solvent and then evaporated that. It's not a recrystallization procedure, which is known as purification method.