4mmc crystalization bine method

[kinshasa99]

I tried brine crystalization in NaCl
23g NaCl dissolved in 100ml water and
100 g 4mmc and put it in the freezer but. the method failed.
Now i have 4mmc solid mixed with NaCl(salt)
Does anyone know how to separate salt from 4mmc?

 

[ChemDamn]

Уyou need to get rid of the water. you will be left with a mixture of NaCl + 4-mmc. then add the IPA and bring to a boil (per 100g of the mixture 2L of IPA). The 4-mmc will dissolve in the IPA and the NaCl will remain as a precipitate. filter . then distill the IPA. but in general, for this type of crystallization, not NaCl is used, but CaCl - be careful)

 

[subzero013]

if you add a little hydrochloric acid to the aqueous solution of mef + water, does it normally crystallize at a negative temperature in the freezer? at - 16 - 20 degrees. will the water not freeze along with the mef?

 

[ChemDamn]

will freeze

 

[ChemDamn]

dissolve 4-mmc in vodka, or in a mixture of water + acetone (50% / 50%), then it will not freeze. but you will not get large crystals by this method. the crystals will be very small, like snowflakes

 

[subzero013]

In the next topic they wrote that at -8 water would not freeze, did not try at this temperature? Is it worth believe? Crystals are very tightly located to each other, look solid

 

[ChemDamn]

if the concentration of 4-mmc in water is 1g per 1ml or more than 1g per 1ml, then at -8C the solution will not freeze. but already at -10C or lower, the solution freezes

 

[george123]

When I want crystalize I must wait for evaporate all liquid?Much staff stay in water?how much days normal I must wait

 

[ChemDamn]

10-15 hours. this is an isohydric method of crystallization - the supersaturation of the solution occurs due to a drop in the temperature of the solvent (water). about 10-20% 4-mmc will remain in the water. therefore, we do not throw away the water, but evaporate it to extract the remaining 4-mmc

 

[george123]

I see Your methods how to crystalize but why people give 2-3 ml per 1 g 4 MMC this will be difference How big are crystals.More solvent more 4 MMC stay on water?

 

[ChemDamn]

3-4 ml per 1 g - this is for the isothermal method - when the supersaturation of the solution is achieved due to the evaporation of the solvent. the longer the solvent evaporates, the larger the crystal size. but this method requires a very long time - from 2 weeks to 2 months (depending on the composition of the solvent - the ratio of water / alcohol or acetone)

 

[G.Patton]

Interesting way. Where have you found it? Do you want to make 4-MMC salt from free base and NaCl?
Mephedrone (4MMC) crystallization

 

[ChemDamn]

no. this method is different. with NaCl, he wanted to lower the freezing point of water in order to more fully precipitate the 4-mmc hydrochloride from it. but apparently I was wrong. to lower the freezing point of water, not NaCl, but CaCl is used. A 10% solution of CaCl lowers the freezing point of water to -20C. NaCl lowers the freezing point of water only to -3C

 

[subzero013]

Does calcium chloride at minus 20 crystallize or not? What is then the meaning of crystallization if Mephedron will have to be cleaned from CaCl by another crystallization? You can replace it with acetone, he will also lower the freezing temperature, then nothing will need to be separated.

 

[ChemDamn]

CaCl at -20C does not crystallize and does not precipitate (it remains in water). I also prefer to use acetone to lower the freezing point of water - in my opinion it's easier and more convenient

 

[G.Patton]

You are not accurate, look at these graphics.
As I said before, this method looks ineffective

 

[ChemDamn]

thanks for the help info!

 

[subzero013]

To secrete salt with other salt is of course a dubious option. Nevertheless, you can try on small number. Tell me what you have achieved the temperature minus 8 degrees for crystallization from water? In household freezers, the temperature starts from minus 12 - 14, in laboratory from minus 10. Am I looking bad or is there any non -standard way?

 

[ChemDamn]

the answer is simple: winter, sub-zero temperatures…

 

[ChemDamn]

Minus 10 fits too