4mmc brown crystals. How to fix it ?
- Thread starter Zabka
- Start date
wash in minus celcius temp acetone
i believe you did somem isatkes when crystalizing, like you crystalized that including impurities. if liquid with mmc was dark colors you should removethem before all of the luqid crystalized - I believe.
i believe you did somem isatkes when crystalizing, like you crystalized that including impurities. if liquid with mmc was dark colors you should removethem before all of the luqid crystalized - I believe.
remember to make them almost solid to make good purufication, if you dont do that you will waste a lot of acetone,1-3 rinses will dp its job but if you wont push them into surface it will take a lot
if you have not good quality acetone - you should distill it 1st, but if you have access to buy clean or better - possess it and use it
as well please tell us what exactly you do to "crystalize" it, i think we can improve that as well
- By Zabka
I make a solution of water / IPA (70/30), warning it up and add 4mmc powder, in proportion ( 1g 4mmc / 2,5ml water/ipa )
After complete dissolution I pour it into a container for evaporation and put it in dark place.
After complete dissolution I pour it into a container for evaporation and put it in dark place.
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Yes please made video because is better for "OTHER" people to see. Not for mine son though cause he already made 10 years. 
- By ifeelsorry
@MMX right now I'm in evaporation process of 60g of meph powder in 30:70 water: alcohol solution, If i heat it will it crystalize faster? How much heat should i use ? And how to heat it? Like direct heat for hot plate or hot water bath? What is difference between organic evaporation, and heating it?
I think your problem lies in the previous step (eg. Filtering precipitate. It may be white, but off-white often also appears white).
For crystallization you could use 2 beakers. In 1 you add water and boil it. In 2 you add dry powder (and/or) a stirbar. Then you slowly pour the some water from 1 to into 2, and place 2 on the heater as well. You keep pouring tiny bits of 1 into 2, until 2 is fully dissolved. You end up having a saturated solution, with minimal of water (1g on 1ml avg). This way, impurities are spotted more easily.
Pour into container and leave for couple hours.
For crystallization you could use 2 beakers. In 1 you add water and boil it. In 2 you add dry powder (and/or) a stirbar. Then you slowly pour the some water from 1 to into 2, and place 2 on the heater as well. You keep pouring tiny bits of 1 into 2, until 2 is fully dissolved. You end up having a saturated solution, with minimal of water (1g on 1ml avg). This way, impurities are spotted more easily.
Pour into container and leave for couple hours.
You should wash it with cold acetone first.
Then disolve your product in hot isoprop and place it in a freezer (over night) until it recrystallized, suck the isoprop up under vakuum and wash it again with cold acetone.
then start to make crystals...
Then disolve your product in hot isoprop and place it in a freezer (over night) until it recrystallized, suck the isoprop up under vakuum and wash it again with cold acetone.
then start to make crystals...