Hi, as said, I repeated the process following the instructions of the document (and your comments) step by step. I got exactly the same product on this step:
I took the oily layer (top layer, which has P2P) and once it cooled down after 10 minutes it has this aspect:
.
Then I added DCM over the other layer (the "water") in order to make the first extraction, however, this was the aspect of the mixture:
as you can see, there was some kind of white precipitate on the bottom, there were not two layers, just the white solids and the rest.
What did I do wrong? The document is not very clear...
Many thanks in advance and sorry for that many questions, but this process it is being a headache...