How do you Dissolve your crude In etoh?

  • Dissolve hot in solvent ( above room temp)
  • Dissolve room temp (70^f) (23^c)
  • Dissolve cold (below room temp)
  • None of the above (my crude starts in ethanol)

0 voters


Hey @sidco I can’t figure out how to unflag this post. The Poll for dissolving Temps is in the origninal post. We changed this off topic thread to one of more value!


:thinking: yeah, what he said . :point_up_2:


This is a test of the emergency future4200 system. Pleaee put down all beakers, flasks, and solvents and head for the door asap!

This is NOT a drill

Also this is not a 2k spoof warning


Maybe it’s his first post so he can get more rights and achievements to the site?


Well, @Noah, I’m not sure what you were testing but I’m going to say that you’ve gotten a negative result. Could be a false negative but I’m feeling pretty solid about this one.

Happy New Year and welcome to the forum!


Man, you guys watch these boards like hawks! I wasn’t sure if I needed posting privileges to start a new topic, and thought I could easily delete posts. Confirmed I can make topics, but revealed I cannot delete my post. Flagged for mod removal.


Would you like to do something creative with the post? perhaps a newyears poll? I can help you set up something real quick! I can change title, listing and all!

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Well, thank you very much! How about a poll: Would you winterize and desolvate all at room temperature if there was such a technique? Yes/no.


Bart Simpson saying ‘testing’ through megaphone lineup

When a flag is approved (one way or another) the post gets hidden. Use the 3 dot menu on the hidden post > Wrench Icon > Unhide

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Hey Future4200 -need some clarity or pointed in a direction.
Running CO2 crude through Carbon A powder and silica post warm (45C) etoh/carbon homogenisation on rotovap. Looked beautiful and very light amber, but as soon as the etoh dissolved it became black/green?
This is the second time in our 400x running the machine this occurred.
Any higher intellect know what’s happening?! Cheers.

As soon as the ethanol dissolves?

Ethanol is presumably the solvent here, so your description needs work…

Pictures and a step by step process may help folks understand what you’re up against.

For Bench/Lab Scale (n <=2 kg crude per batch)

  • Glassware is acceptable, stainless steel preferred
  • Gravimetric measurements always preferred when possible when working with fluids


  1. Flammability - Organic solvents (alcohols, alkanes) are highly flammable liquids and vapors. Never use an open flame to heat solvents. Never heat directly, transfer heat to solvents from some medium such as water or sand. Avoid static electric generating materials. Keep away from oxidizers.
  2. Respiratory - Solvents exist in an equilibrium between liquid and vapor states and have a measurable vapor pressure, which increases OSHA has established permissible exposure limits (PELs) for 100 solvents.


  1. Personal Protective Equipment (PPE)
  • Eyes - ANZI Z87 Safety Glasses/Goggles

  • Skin - Wear long sleeved clothing. Wear gloves where possible.

  • Inhalation - Use solvents in areas that are well ventilated or a fume hood.

  1. Engineering
  • Fume Hood and exhaust blower for working with small quantities

  • Forced air ventilation

  • Monitoring sensors

  • Non-spark generating equipment/electronics

  1. Administrative
  • Standard Operating Procedures

  • Refresher Training


  1. Determine solvent to solute ratio: grams of solvent for grams of crude. How well the solvent dissolves the solute will depends on temperature and the polarity of solvent and solute. Like dissolves like, and more hydrophobic solvents (alkanes, alkenes) will dissolve more solute with less solvent.
  • For ethanol 8-10 grams per 1 gram crude

  • For alkanes 4-6 grams per 1 gram crude

  • etoh_grams = 10 * Grams of Crude

  1. Take a portion from ‘etoh_grams’ - approximately 2-3 times the grams of crude oil - from the ‘etoh_grams’ found in #1, transfer to a vessel. This portion of ‘etoh_grams’ will be used to initially dissolve the crude, and the remainder ‘etoh_grams’ used for final dilution of crude.

  2. Begin warming solvent portion from #2 - follow SDS guidelines for hazards, PPE, and physical/chemical properties (flashpoint, boiling point) for safe handling. Avoid heating solvents directly. If using a hot plate, place a water basin on the hot plate with spacers on the bottom and place your solvent vessel on the spacers so water heats the solvent vessel instead directly by hot plate.

  • Note: Water or sand-bath preferred.
  1. Warm crude to lower viscosity.
  • Note: I place my baine marie with crude in sonicating hot water bath.*
  • 1 +- 0.5 hr @ 60 C (will depend on materil this is an estimate.
  1. Transfer solvent portion heated to baine marine with warmed crude. Note: Depending on batch size and baine marie size, it may be necessary to retransfer crude to a larger vessel, such as a 3-5 L beaker.

  2. Homogenize partial crude-eoth solution. I use Kinematica homogenizer for this (Note: No glass here, transfer solution to polycarbonate container) but a stir bar works as well.

  • A hot water sonicator works too (if large enough).
  1. When partial solution is homogenized, It will appear uniform inconsistency color and density throughout the solution. Transfer of the partial solution and the remaining solution previously heated, transfer of the partial solution and the remaining solvent previously heated, ‘etoh_grams’, to a carboy of appropriate size, Nalgene preferred.

DM me

Yeah, totally- let me further describe our process -bear with the tediousness.
Ethanol is the solvent.
Once the oil is pulled off the 4x20L Apeks CO2 machine →
We do a 10x winterisation in our -60C freezer (ie: Crude Oil = 2775.2g) EtOH added = 35L, after it is filtered we do a small EtOH reduction before carbon filtering (4x reduction: we do this because we found this removes the “ash” material in the bottom of the buchi). Buchi parameters are 45C at 60rpm
Post winterisation we use Summit Research Carbon A powder at 12% of our crude oil yield (Crude oil =2775.2, Carbon powder = 333.1g) and filter it with Summit Research Canna Sondergut Silikate Pulver!
Post Filtration we throw it back on the Buchi and pull it to 10mbar at 85C and 80rpm.

On two separate occasions our oil, instead of looking like a light amber/ honey colour, it is black/green like it has carbon and chlorophyll still in it. We tried re-winterising and colour remediation, but it failed.
Pictures to follow, I just dropped my phone and broke it - this monday is not my day haha. Cheers folks and thank you Rust for that!!!

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