How much shall I fill a 5L boiling flask to start a SPD distillation?

Hi everyone,
I have a SPD installation but I have no idea what will be the min and max of crude oil fill up of the boiling flask in order to get some distilled fractions.

Thanks in advance!

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More than half is best. The lower you start the harder it will be to run or even the thermometer to see the temp accurately or at all.

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Like the king said. I usually do 3.0L-3.5L. Be careful of a big off-gas muffin if you have any alcohol/hexane/pentane left in your crude. If you do get ready to regulate vac somehow.

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Between 60-70% full. Too full will muffin into your head.

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As long as you don’t rush your decarboxylation stage, at 60-70% max, you should be okay.

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I generally throw in 3L of material in a 5L flask.

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