Dimethyl ether extraction after butane extraction

ptfarmer420 said:

Hi guys,

Need your input in this one ...

I'm a home grower and to maximize my extract yield i'm doing one extraction with butane and right after i'm doing a Dimethyl ether extraction with the same material. After this i vacuum purge the two batches for 2 days with a stable 36ºC.

Is it safe to consume (dab ) the second run result ?

Many thanks !

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Gray Wolf said:

Yes, if it is adequately purged.

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ptfarmer420 said:

Cheers Gray Wolf !

Is vacuum purge for 2 days with 36C adequate?

Many thanks !

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Gray Wolf said:

How deep vacuum?

I typically use hotter and less time, but 2 days at 36C and -29.5" Hg should have done it.

I typically heat it until it is just fully molten, and then pull vacuum. Typically closer to 46C.

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ptfarmer420 said:

Hi guys,

Need your input in this one ...

I'm a home grower and to maximize my extract yield i'm doing one extraction with butane and right after i'm doing a Dimethyl ether extraction with the same material. After this i vacuum purge the two batches for 2 days with a stable 36ºC.

Is it safe to consume (dab ) the second run result ?

Many thanks !

Click to expand...

SkyHighLer said:

Dimethyl ether (DME) is Generally Recognized As Safe (GRAS,) and doesn't form peroxides.

https://www.fda.gov/downloads/Food/IngredientsPackagingLabeling/GRAS/NoticeInventory/ucm556335.pdf


DuPont's interest in DME has been transferred to Chemours,

https://www.chemours.com/Propellants/en_US/assets/downloads/hp-dme-technical-information.pdf

Toxicity
HP DME has low acute and chronic toxicity. Although an ACGIH TLV® has not been established for dimethyl ether, a value of 1,000 ppm seems appropriate based on its low toxicity. The main physiological action is that of “weak anesthesia” at high inhaled levels. Weak cardiac sensitization has been observed in animals exposed to HP DME at about 200,000 ppm, a circumstance that would likely occur only in gross misuse situations or accidental release of the propellant.

A two-year inhalation study and carcinogenicity bioassay at exposure levels of up to 20,000 ppm showed no compound related effects in the test animals examined for gross signs, body weight, hematology, urine analysis, blood chemistry, and gross and histopatholigic examination of tissues at any exposure level. HP DME showed no signs of carcinogenicity in the study and in separate reproductive studies, HP DME has shown no evidence of mutagenicity or teratogenicity. Based on all these studies, the products have been approved by Chemours for general aerosol use, including personal products.


I've been searching without success for DME's ET(30) polarity value, if I had it I would place DME on my Solvents and Polarity list.

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Gray Wolf said:

Dielectric constant is about 7.63. https://www.organicdivision.org/orig/organic_solvents.html

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SkyHighLer said:

Thanks, now I know DME is also the abbreviation for dimethoxyethane.

Dimethoxyethane, also known as glyme, monoglyme, dimethyl glycol, ethylene glycol dimethyl ether, dimethyl cellosolve, and DME, is a clear, colorless, aprotic, and liquid ether that is used as a solvent, especially in batteries.

https://en.wikipedia.org/wiki/Dimethoxyethane


If you follow the link to the table GW found, and follow the reference, you'll find the following reference,

2) The values for relative polarity are normalized from measurements of solvent shifts of absorption spectra and were extracted from Christian Reichardt, Solvents and Solvent Effects in Organic Chemistry, Wiley-VCH Publishers, 3rd ed., 2003.

I downloaded the fourth edition for free, it's available at Library Genius.

https://gen.lib.rus.ec/

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