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Cold water extraction: Difference between revisions
>David Hedlund Up to 50% (25% solvents, and 25% insoluble impurities) has been discarded, reported from people who initially though they possessed a "pure" substance. |
>David Hedlund →For a whole batch: Conditionally, dry the substance to calculate how solvents/water that the batch contained |
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# Weight the substance, and write down the value. | # Weight the substance, and write down the value. | ||
# For lumped substances: Break them apart | # For lumped substances: Break them apart, and sift the powder with a coarse strainer, and then with a fine strainer, to make them easy to dissolve. | ||
# Conditionally, dry the substance to calculate how solvents/water that the batch contained. Use completely dried silica gel (can be heat in microwave for 5 minutes at 800W) in a sealed container, and weigh samples until they don't lose any weight, which indicates that it's completely dry. Expect a loss of ~25% wet weight from large lumps, and 50% methanol from a paste. | |||
# Add the fine powder to a glass jar, and add 10 times more boiling water than the quantity of the substance, and shake well for 10 seconds. This should precipitate the soluble substances in the water. | # Add the fine powder to a glass jar, and add 10 times more boiling water than the quantity of the substance, and shake well for 10 seconds. This should precipitate the soluble substances in the water. | ||
# Let the water cool down to room temperature. | # Let the water cool down to room temperature. | ||