Introduction
This topic is a detailed description of procedures, which have to be done in order to form racemic methamphetamine hydrochloride crystals. Racemic methamphetamine hydrochloride (d,l-meth) can't be recrystallized into large shards like d-methamphetamine hydrochloride. For a d,l-methamphetamine isomer separation, you need to carry out different procedures.
Equipment and Glassware:
- Beakers 800 mL x2; 150 mL x2;
- Pyrex dish (crystallization tray);
- Funnel;
- Filter paper;
- Heating plate;
- Buchner flask and funnel;
- Vacuum pump;
- Spatula;
- Glass rod;
- Measure cylinder 100 mL;
- Laboratory scales (optional);
Reagents:
- Methamphetamine hydrochloride (150 g) aqueous solution;
- Distilled water ~400 mL;
- Ethanol 88% 50 mL;
- Ethyl acetate ~70 mL;
- Acetone ~70 mL;
Procedure
1. A saturated methamphetamine hydrochloride (150 g) aqueous solution is diluted with water (150 mL) in a 800 mL beaker. A more fluid solution is better filtered with a paper filter.
2. The solution is filtered through a paper filter into a crystallization tray.
3. The solution is evaporated to an methamphetamine hydrochloride crystals at constant heating 50-70℃ for 3 days. This method doesn't allow to get methamphetamine hydrochloride shards (ice).
4. The resulting methamphetamine hydrochloride is transferred into a 800 mL beaker and poured with a mixture of 88% ethanol 50 ml with water 50 ml until dissolved.
5. Next, the solution is brought to 250-300 mL with an aqueous alcohol solution (1:1; H2O:EtOH).
6. The solution is evaporated at room temperature.
7. The evaporation time may take ~1.5 months.
8. A mixture of ethyl acetate with acetone (1:1) 80 mL is added to the crystals and mixed.
9. Methamphetamine hydrochloride crystals are filtered through a porous Schott filter.
10. It is washed with a portion of an ethyl acetate and acetone mixture.
11. Methamphetamine hydrochloride is dried to a constant weight.
2. The solution is filtered through a paper filter into a crystallization tray.
3. The solution is evaporated to an methamphetamine hydrochloride crystals at constant heating 50-70℃ for 3 days. This method doesn't allow to get methamphetamine hydrochloride shards (ice).
4. The resulting methamphetamine hydrochloride is transferred into a 800 mL beaker and poured with a mixture of 88% ethanol 50 ml with water 50 ml until dissolved.
5. Next, the solution is brought to 250-300 mL with an aqueous alcohol solution (1:1; H2O:EtOH).
6. The solution is evaporated at room temperature.
7. The evaporation time may take ~1.5 months.
8. A mixture of ethyl acetate with acetone (1:1) 80 mL is added to the crystals and mixed.
9. Methamphetamine hydrochloride crystals are filtered through a porous Schott filter.
10. It is washed with a portion of an ethyl acetate and acetone mixture.
11. Methamphetamine hydrochloride is dried to a constant weight.
I've been using it for a while now, and I'm not sure if it's the right one for me, but I'm sure it's the right one for you, and I'm sure it's the right one for you. Is there a sequential process that I missed after I completed the Moscow route? Thanks again if any senior expert can help me with this question. 
