4:1 if its crude and 3:1 if its first pass.
If u have 1L of crude, use 4L of heptane.
Now get 20L ready of each:
Ph 4 water @30C with 15% salt.
Ph 7 water @30C with 15% salt.
Ph 9 water @30C with 15% salt.
Ph 7 water with 5% salt.
Ph 7 water.
Use Citric acid for ph down and and baking soda for ph up (mod edit: these were backwards…).
U want to mix ur heptane mix 1:1 with each mixture in the order i listed. (Order of first 3 doesnt matter, atleast i cant tell) You will do 4 washes of each ph before moving onto the next mixture and make sure you finish it off with 4 rinses of plain ph 7 water.
Shake/agitate the shit out of it for 2 minutes, then let it settle for 15 minutes before emptying out the water portion. I like to collect all the end portions (the part that is part water and part heptane) in a separate sep funnel, and I usually catch a couple grams that would have been dumped with the water
I really like to filter through a packed silica/T5/ Activated alumina column or even butchner after these steps.
If u can do it all under nitrogen and slight pressure, it helps a ton with the color
At the very least flush the solvent through some molecular beads like 3a but 10a works better. To capture all the mini particles of water that are suspended in the heptane mixture