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n-pantane for Solvent

Discussion in 'Concentrates and Extracts' started by woodsmantoker, Jan 29, 2013.


    woodsmantoker Well-Known Member

    Howdy Folks,

    Wanted to ask the group what the thoughts are, or what the consensus is on using N-pantane as a solvent for isolating terpines. I hear GW uses pantane. I know there are a few of you out there that can give me some good info here on this subject. I am not sure if Peanut Butter is around these parts, but I know he could answer more than I could understand.. Shot in the dark.

    Any pertinent info would be appreciated. Thanks!


    Fadedawg Well-Known Member

    n-Pentane is a simple alkane, which works excellently as a non polar solvent for extraction and is easier to purge than n-Hexane. You can soak overnight with no unwanted polar element pickup and it produces a pristine oil.

    As it is non polar, it does pick up non polar waxes, which we remove by winterization with ethanol.

    The winterization also makes it easier to purge out the remaining pentane to below sensory threshold, as its boiling point is only 36.1°C/97°F, so the 78.5°C/173.3°F boiling point ethanol takes the residuals with it when it exits.

    We like HPLC reagent grades, because they are pure enough to not show unwanted peaks on a liquid chromatograph. http://www.sciencelab.com/msds.php?msdsId=9927384

    oilmkr420 Active Member

    I like to use a methylpentane, isobutane, and ethanol all smacked in w cosub2. It is my favorite recipe. There is a downside. Any residues left behind are toxic and hit the CNS. Its got a high boiling point of like 211F so it must be purged well. I want no part of toxic residues from grotess common knowledge. Just cuz you hear GW talk these things, you guys fail to acknowledge that he is an accredited scientist who knows there's more than one way to skin a cat. So he has numerous methods that may be employed to get that purged out and he should be warning you if you vape hexane residues what kind of damage will be done to your body when using toxic solvents to obtain these desired compounds of interest.

    Fadedawg Well-Known Member

    Here you go! It looks to me like sensory threshold is 130 ppm and the LC-50 is about 25,000 ppm. It tastes and smells like gasoline at about 1/2 of one percent of LC-50, so it should be easy to avoid underpurged oil. https://www.sciencelab.com/msds.php?msdsId=9927187

    Section 11: Toxicological Information

    Routes of Entry: Absorbed through skin. Dermal contact. Inhalation. Ingestion.

    Toxicity to Animals:
    toxicity (LD50): 25000 mg/kg [Rat]. Acute toxicity of the gas (LC50): 48000 ppm 4 hours [Rat].

    Chronic Effects on Humans:

    MUTAGENIC EFFECTS: Mutagenic for bacteria and/or yeast. May cause damage to the following organs: peripheral nervous
    system, skin, central nervous system (CNS).

    Other Toxic Effects on Humans:
    Very hazardous in case of ingestion, of inhalation. Hazardous in case of skin contact (permeator). Slightly hazardous in case
    of skin contact (irritant).

    Special Remarks on Toxicity to Animals: Not available.

    Special Remarks on Chronic Effects on Humans:

    May cause adverse reproductive effects based on animal data. May be tumorigenic based on animal data. May affect genetic
    material. Passes through the placental barrier in animal.

    Special Remarks on other Toxic Effects on Humans:
    Acute Potential Health Effects: Skin: May cause mild skin irritation. It can be absorbed through the skin in harmful amounts.
    Eyes: May cause mild eye irritation. Inhalation: May be harmful if inhaled. Inhalation of vapors may cause respiratory tract
    irritation. Overexposure may affect, brain, spinal cord, behavior/central and peripheral nervous systems (lightheadness,
    dizziness, hallucinations, paralysis, blurred vision, memory loss, headache, euphoria, general anesthetic, muscle weakness,
    numbness of the extremeties, asphyxia, unconciousness and possible death), metabolism, respiration, blood, cardiovascular
    system, gastrointestinal system (nausea) Ingestion: May be harmful if swallowed. May cause gastrointestinal tract irritation
    with abdominal pain and nausea. May also affect the liver, blood, brain, peripheral and central nervous systems. Symptoms of
    over exposure by ingestion are similar to that of overexposure by inhalation.

    woodsmantoker Well-Known Member

    Thanks for the info..had a 55gal drum of it laying around and figured I would investigate.
    MiG pilot

    MiG pilot Well-Known Member

    Remember that Vapor Density: 2.49 (Air = 1)

    Fadedawg Well-Known Member

    Also a high vapor pressure {57.90 kPa (at 20.0 °C)}, so subtle reminder to keep it cool and the lid on tight or you won't have a barrel of Pentane any longer and the vapors will hug the floor similar to Butane................................................

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