📋 Workflow
Full workflow, products add-to-cart directly1
Assemble the still
20 minSet up flask, still head, condenser, and receiver; check seals and airtightness.
💡 Tip Add boiling chips or a stir bar to prevent bumping
⚠️ Caution Poor sealing loses low-boiling components
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2
Atmospheric or vacuum distillation
1–3 hDistill at controlled heating rate, record head temperature ranges, collect fractions.
💡 Tip Vacuum distillation prevents high-boilers from degrading
⚠️ Caution Use a buffer flask to prevent back-suction in vacuum
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3
Collect fractions
30 minCollect each fraction over a distinct head-temperature range and label it.
💡 Tip Keep fractions separate for easier handling
⚠️ Caution Don't halt heating while switching receivers
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4
Identify the product
20 minConfirm key fractions by refractive index, boiling point, or GC purity.
💡 Tip Refractive index vs literature is fast
⚠️ Caution High purity still needs GC quantitation
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⚠️ 5 Common Beginner Mistakes
- ① No boiling chips causes bumping
- ② Heating too fast drifts head temperature
- ③ Back-suction contaminates product under vacuum
- ④ Leaks lose low-boiling components
- ⑤ Atmospheric distillation degrades heat-sensitive product
❓ FAQ
+When to use vacuum distillation?
High boilers (>150℃) or thermally labile compounds.
+Similar boiling points?
Use a fractionating column or true rectification.
+How to avoid bumping?
Add boiling chips, magnetic stirring, or gas inlet.