How to distill solvents



You’re welcome, sir. More than happy to help.


This is the design for our butane trap. It is specifically for capturing butane in the early parts of crude oil distillation. You probably want to use dry ice/cold finger to condense the butane.

I’ve always thought it looked pretty cool.


I’m not sure I follow…
A) How much butane are you actually collecting from crude oil?
B) What makes this cold trap selective to butane?
C) How do you transfer the butane to it’s appropriate storage container without exposure to atmosphere?
D) Why is there not a PRV? What happens if the source of cold stops/malfunctions, and the butane begins to boil?
E) I see three orifices. Two rounded joints up top and one drain. One of the rounded joints is the coil inlet, and the coil drains from the bottom. Is this the thermal side or the process side of the system? What about the rounded ball joint leading to the “bottle” or “cylinder”?

  1. Like 100 mL butane. Crude oil composition is varied as is processing.
  2. Surface area
  3. The butane is just weighed to determine %composition. Distill butane-> isolate receiver-> weigh -> dump in the parking lot
  4. It isn’t meant to be a storage container. It is distilled at atmospheric pressure because the BP is so low so it isn’t a closed system until you are weighing it quickly.
  5. There is only two holes. On for butane to enter the trap and then the outlet. Would draw some arrows but I am only on my phone so can’t edit that well.

It isn’t super relevant to mass butane refining or anything, I just wanted to share what we have. This is for ASTM D2892.


Wanted to make sure I have the process down.

Is this an appropriate sop-

Transfer LPG from solvent source tank into collection pot. Raise solvent tank temperature while lowering collection pot temperature to increase and help flow. Once all solvent is into collection pot, raise temperature to 85f. After temperature is reached, turn recovery pump on and recover solvent from collection pot, transfer into clean solvent recovery tank. Unwanted heavier hydrocarbons will be left behind in collection pot-to be collected and discarded.

Appreciate ANY comment or critic.


I don’t see anywhere that you vacuum assist the gas into its destination.

You might wanna vacuum down the destination vessel. Also having those destination vessels fully chilled before transferring the gas makes this process so much easier.

Rather than heating the source tank then chilling. It’s should get your destination tank super cold. Start transfer then heat to prevent unnecessary pressure.

To add to that. If your tanks have a liquid dip tube. I extract and recover threw the liquid side


Thanks killa. Makes sense


I’m not an alkane extractor, can someone explain to me why you would need to distill your butane/propane solvent before use?


There’s a mystery oil(is either residual bad stuff in gas or lube to keep tank from rusting from can plant to filling plant) that’s left in collection pot after running dry runaka no material, some ppl run dry several times to ensure any residuals are left behind in the collection pot… Clean up collection after then your ready

And just to ensure its clean, it’s just a dry run w no material…I run my sieve also, want it no moisture if possible


Interesting. Are there any suppliers who have reliably clean solvent where this is unnecessary?


This is after distilling 2 24# tanks it’s not just mystery oils your trying to remove


Can u pay grand instead 200$-300$? It’s redick priced…I may still distill it


Mystery oil as This is called is one problem the other is purity of gas
@Killa12345 knows the works


What kind gas is that ur using, I’ve NEVER seen such


Our units have a secondary evaporator attached to the unit. We load liquid solvent into that sidecar evaporator, and distill it out of that unit. That way any contamination in the pot is distilled out and removed before it ever touches the part of the extractor which handles our biomass or extract.

If you’re having trouble getting solvent to flow, use your recovery pump, if you have one, to assist by sucking vapor out of your evaporator (collection pot), and pumping it back into your recovery tank. If you’re running passively, you can apply heat to your recovery tank or put your collection pot under colder temperatures such as using dry ice.

In general, solvent will always flow from high pressure to low pressure, and from high temperature to low temperature.


Now that is how a professional hashashan loads solvent!!


When you run 24hrs a day you gotta figure out a way to keep those wheels turning! Every minute of down time is lost money.



That one was especially bad because it was 2 tanks but its 99% pure ntane ill have to look at the tank again to see where its from but i wanna say purity cylinder gas from ann arbor welding supply.


Ive been doing it like this for a couple years. Since my collection vessel is rack mounted and a pain to take apart I setup a large “fill” pot that can be simultaneously filling my system while running the normal side without a hiccup