Residual Solvent vs Vacuum Purge & Whipping

As cannabis concentrates become more common, we often get questions about vaccuum purge time and whipping, in relation to hydrocarbon extractions.
A client recently submitted four concentrate samples for Residual Solvent Analysis (RSA). The first three samples were identical except for the vacuum purge time (72, 92, and 120 hours). The forth was also identical except for whipping at 72 hours and another 12 hour purge, resulting in a budder.

Contamination vs Vacuum Purge Time

Below is a plot of four contaminants in a concentrate sample as a function of purge time:

Residual Solvent Levels vs Purge Time
Y-axis is logarithmic, for clarity.

The slope of the line at any point indicates the rate of removal of that contaminant. Notice that the slope (rate of removal) is smallest for neopentane and largest for butane. This means that butane is easier to get rid of than is neopentane, with the others falling in between.

All four complete RSA reports can be viewed below, courtesy of Nugrun Concentrates. Note that the finished Budder has the lowest residual levels.


120 hour vacuum purge Residual solvent report

96 hour vacuum purge plus whip - Residual solvent  report

96 hour vacuum purge  - Residual solvent  report
72 hour vacuum purge - Residual solvent  report

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