There is always that problem around with both layers not separating.
I did not watch that video but I guess it is about Naphtha not separating from water?
The first stuff that is told in that situations:
- add more NaOH or Ca(OH)2
- let it settle over night
- add more Naphtha
Also if you did not filter your solution, then maybe that is the reason why the layers are not separating.
Having too much particles of the bark left in the soup will make it harder for the layers to separate.
Other people told that you may have to shake it by vibration. You could make it sit on your washing machine when it is in its last cycle. But keep attention that it does not fall from the top!
Also putting a Dildo against the walls would be somehow adding vibration to the system
Maybe if heating it up it could also separate the layers.
Last but not least: When you want a cheap source of Naphtha, go to the DIY Market and buy *Wasch-Benzin / Reinigungs-Benzin*.
1 L = 6 € and this is good Naphtha. But it should have a vaporization temperature of not higher than 60 - 80 °C.